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Enterprise Fintech Platform Architecture & Design

1. System Overview

High-Level Architecture

┌─────────────────────────────────────────────────────────────────────────────┐
│                                Frontend Layer                               │
├─────────────────────────────────────────────────────────────────────────────┤
│  Next.js App (SSR/SSG)  │  Real-time Dashboard  │  Mobile PWA             │
│  - Client Components    │  - SSE Connections    │  - Offline Support      │
│  - Server Components    │  - Dynamic UI Updates │  - Push Notifications   │
└─────────────────────────────────────────────────────────────────────────────┘
                                        │
┌─────────────────────────────────────────────────────────────────────────────┐
│                              API Gateway Layer                              │
├─────────────────────────────────────────────────────────────────────────────┤
│              Nginx + Easegress API Gateway                                 │
│  - Load Balancing        │  - Rate Limiting      │  - SSL Termination     │
│  - Authentication        │  - Request Routing    │  - API Versioning      │
└─────────────────────────────────────────────────────────────────────────────┘
                                        │
┌─────────────────────────────────────────────────────────────────────────────┐
│                            Microservices Layer                              │
├─────────────────────────────────────────────────────────────────────────────┤
│ Account Service │ Transaction Service │ Payment Service │ Rule Engine Service│
│ Card Service    │ Balance Service     │ Fee Service     │ Notification Service│
│ Customer Service│ Audit Service       │ Report Service  │ Alert Service      │
└─────────────────────────────────────────────────────────────────────────────┘
                                        │
┌─────────────────────────────────────────────────────────────────────────────┐
│                           Message & Streaming Layer                         │
├─────────────────────────────────────────────────────────────────────────────┤
│              NATS (JetStream) Message Queue System                         │
│  - Event Streaming       │  - Message Persistence │  - Dead Letter Queue   │
│  - Transaction Events    │  - Payment Events       │  - Balance Updates     │
└─────────────────────────────────────────────────────────────────────────────┘
                                        │
┌─────────────────────────────────────────────────────────────────────────────┐
│                              Data Layer                                     │
├─────────────────────────────────────────────────────────────────────────────┤
│  PostgreSQL (OLTP)      │  ClickHouse (OLAP)     │  Redis (Cache)          │
│  - Transactional Data   │  - Analytics Data      │  - Session Storage      │
│  - ACID Compliance      │  - Time Series Data    │  - Real-time Balances   │
│  - Materialized Views   │  - Audit Logs          │  - Rule Cache           │
└─────────────────────────────────────────────────────────────────────────────┘
                                        │
┌─────────────────────────────────────────────────────────────────────────────┐
│                           Configuration & Service Discovery                  │
├─────────────────────────────────────────────────────────────────────────────┤
│                              etcd Cluster                                   │
│  - Service Discovery     │  - Configuration Mgmt  │  - Leader Election      │
│  - Feature Flags         │  - Circuit Breaker     │  - Health Monitoring    │
└─────────────────────────────────────────────────────────────────────────────┘

2. Technology Stack Implementation

Backend Services (Go)

Communication: gRPC for inter-service communication
HTTP: RESTful APIs with Gin/Echo framework
Concurrency: Goroutines and channels for multi-threading
Design Patterns: Repository, Factory, Observer, Command, Strategy
Configuration: Viper with etcd backend

Frontend (Next.js)

Server Components: Data fetching and initial rendering
Client Components: Interactive UI elements
SSE: Real-time updates via Server-Sent Events
Dynamic UI: Real-time balance updates, transaction status
Multi-threading: Web Workers for heavy computations

Message Queue (NATS)

JetStream: Persistent message streaming
Subjects: Domain-specific message routing
Consumer Groups: Load balancing and fault tolerance

Databases

PostgreSQL: Primary transactional database
ClickHouse: Analytics and time-series data
Redis: Caching and session management

3. Database Design

PostgreSQL Schema

Customers Table

sql

customers:
- customer_id (UUID, PK)
- customer_number (VARCHAR, UNIQUE)
- first_name (VARCHAR)
- last_name (VARCHAR)
- email (VARCHAR, UNIQUE)
- phone (VARCHAR)
- date_of_birth (DATE)
- status (ENUM: active, suspended, closed)
- kyc_status (ENUM: pending, verified, rejected)
- created_at (TIMESTAMP)
- updated_at (TIMESTAMP)
- created_by (UUID)
- updated_by (UUID)

Accounts Table

sql

accounts:
- account_id (UUID, PK)
- customer_id (UUID, FK -> customers.customer_id)
- account_number (VARCHAR, UNIQUE)
- account_type (ENUM: checking, savings, credit, wallet)
- currency (VARCHAR(3))
- status (ENUM: active, frozen, closed)
- available_balance (DECIMAL(20,4))
- pending_balance (DECIMAL(20,4))
- credit_limit (DECIMAL(20,4))
- created_at (TIMESTAMP)
- updated_at (TIMESTAMP)
- last_transaction_at (TIMESTAMP)

Cards Table

sql

cards:
- card_id (UUID, PK)
- account_id (UUID, FK -> accounts.account_id)
- card_number_hash (VARCHAR)
- card_type (ENUM: debit, credit, prepaid)
- card_status (ENUM: active, blocked, expired)
- expiry_date (DATE)
- daily_limit (DECIMAL(20,4))
- monthly_limit (DECIMAL(20,4))
- pin_attempts (INTEGER)
- created_at (TIMESTAMP)
- last_used_at (TIMESTAMP)

Transactions Table (Ledger)

sql

transactions:
- transaction_id (UUID, PK)
- account_id (UUID, FK -> accounts.account_id)
- related_transaction_id (UUID, FK -> transactions.transaction_id)
- transaction_type (ENUM: debit, credit, fee, reversal)
- amount (DECIMAL(20,4))
- currency (VARCHAR(3))
- status (ENUM: pending, posted, archived, failed)
- description (TEXT)
- reference_number (VARCHAR, UNIQUE)
- merchant_info (JSONB)
- posting_date (DATE)
- transaction_date (TIMESTAMP)
- created_at (TIMESTAMP)
- posted_at (TIMESTAMP)
- archived_at (TIMESTAMP)

Payments Table

sql

payments:
- payment_id (UUID, PK)
- from_account_id (UUID, FK -> accounts.account_id)
- to_account_id (UUID, FK -> accounts.account_id)
- payment_type (ENUM: transfer, payment, topup)
- amount (DECIMAL(20,4))
- currency (VARCHAR(3))
- status (ENUM: initiated, processing, completed, failed, reversed)
- payment_method (ENUM: card, bank_transfer, wallet)
- reference_number (VARCHAR, UNIQUE)
- external_reference (VARCHAR)
- scheduled_at (TIMESTAMP)
- processed_at (TIMESTAMP)
- created_at (TIMESTAMP)

Rules Engine Tables

sql

rules:
- rule_id (UUID, PK)
- rule_name (VARCHAR)
- rule_type (ENUM: fee, limit, validation, alert)
- rule_category (VARCHAR)
- conditions (JSONB)
- actions (JSONB)
- priority (INTEGER)
- effective_from (TIMESTAMP)
- effective_till (TIMESTAMP)
- status (ENUM: active, inactive, draft)
- created_at (TIMESTAMP)
- updated_at (TIMESTAMP)

rule_executions:
- execution_id (UUID, PK)
- rule_id (UUID, FK -> rules.rule_id)
- entity_type (VARCHAR)
- entity_id (UUID)
- input_data (JSONB)
- output_data (JSONB)
- execution_time_ms (INTEGER)
- executed_at (TIMESTAMP)

Fee Configuration Tables

sql

fee_tiers:
- tier_id (UUID, PK)
- tier_name (VARCHAR)
- tier_type (ENUM: customer, account, transaction)
- effective_from (TIMESTAMP)
- effective_till (TIMESTAMP)
- created_at (TIMESTAMP)

fee_structures:
- fee_structure_id (UUID, PK)
- tier_id (UUID, FK -> fee_tiers.tier_id)
- transaction_type (VARCHAR)
- fee_type (ENUM: flat, percentage, tiered)
- flat_amount (DECIMAL(20,4))
- percentage_rate (DECIMAL(10,6))
- minimum_fee (DECIMAL(20,4))
- maximum_fee (DECIMAL(20,4))
- currency (VARCHAR(3))

ClickHouse Schema (Analytics)

Transaction Analytics

sql

transaction_analytics:
- transaction_id (String)
- account_id (String)
- customer_id (String)
- transaction_type (String)
- amount (Decimal64(4))
- currency (String)
- merchant_category (String)
- location (String)
- timestamp (DateTime64)
- processing_time_ms (UInt32)
- status (String)
- date (Date)
- hour (UInt8)

Balance History

sql

balance_history:
- account_id (String)
- balance_date (Date)
- balance_timestamp (DateTime64)
- available_balance (Decimal64(4))
- pending_balance (Decimal64(4))
- currency (String)
- change_amount (Decimal64(4))
- change_reason (String)

Redis Data Structures

Real-time Balances

Key: "balance:{account_id}"
Type: Hash
Fields:
- available: "1000.50"
- pending: "150.25"
- last_updated: "1640995200"
- currency: "USD"

Rule Cache

Key: "rules:{rule_type}:{entity_id}"
Type: String (JSON)
TTL: 3600 seconds (1 hour)

Session Management

Key: "session:{session_id}"
Type: Hash
TTL: 1800 seconds (30 minutes)

4. Service Architecture

Core Services

Account Service

Responsibilities:

Account lifecycle management
Balance aggregation and real-time updates
Account status management
Credit limit management

Key Features:

Real-time balance calculation using Redis
Event-driven balance updates via NATS
Materialized views for account summaries
Multi-threading for bulk operations

Transaction Service

Responsibilities:

Transaction lifecycle (Pending → Posted → Archived)
Double-entry bookkeeping
Transaction validation and processing
Audit trail maintenance

Key Features:

Saga pattern for distributed transactions
Event sourcing for transaction history
Batch processing for settlements
Real-time transaction streaming

Payment Service

Responsibilities:

Payment processing (pay, reverse, incremental pay)
Payment method management
External payment gateway integration
Payment scheduling and retries

Key Features:

Command pattern for payment operations
Compensation actions for reversals
Idempotency handling
Payment status tracking

Rule Engine Service

Responsibilities:

Rule evaluation and execution
Dynamic rule configuration
Rule performance monitoring
A/B testing for rules

Key Features:

CEL (Common Expression Language) for rule definitions
Rule caching with Redis
Effective date management
Rule versioning and rollback

Fee Service

Responsibilities:

Fee calculation (flat and percentage)
Fee tier management
Fee exemption handling
Fee reporting and reconciliation

Key Features:

Strategy pattern for fee calculation
Tiered fee structures
Real-time fee preview
Fee optimization algorithms

5. Inter-Process Communication (IPC)

gRPC Services

protobuf

// Account Service
service AccountService {
  rpc GetAccount(GetAccountRequest) returns (Account);
  rpc UpdateBalance(UpdateBalanceRequest) returns (BalanceResponse);
  rpc GetRealTimeBalance(GetBalanceRequest) returns (stream BalanceUpdate);
}

// Transaction Service
service TransactionService {
  rpc CreateTransaction(CreateTransactionRequest) returns (Transaction);
  rpc PostTransaction(PostTransactionRequest) returns (TransactionResponse);
  rpc GetTransactionHistory(GetHistoryRequest) returns (stream Transaction);
}

// Rule Engine Service
service RuleEngineService {
  rpc EvaluateRules(EvaluateRulesRequest) returns (RuleEvaluationResponse);
  rpc CreateRule(CreateRuleRequest) returns (Rule);
  rpc GetActiveRules(GetActiveRulesRequest) returns (stream Rule);
}

NATS Subjects

// Transaction Events
transactions.created.{account_id}
transactions.posted.{account_id}
transactions.failed.{account_id}

// Balance Events
balances.updated.{account_id}
balances.insufficient.{account_id}

// Payment Events
payments.initiated.{payment_id}
payments.completed.{payment_id}
payments.failed.{payment_id}

// Rule Events
rules.evaluated.{rule_id}
rules.triggered.{entity_type}.{entity_id}

// System Events
alerts.generated.{severity}
system.health.{service_name}

6. Frontend Architecture (Next.js)

Server Components

Dashboard Pages: Server-side rendering for SEO and performance
Report Generation: Heavy data processing on server
Initial Data Loading: Prefetch account and transaction data

Client Components

Real-time Balance Display: SSE connections for live updates
Transaction Forms: Interactive form validation
Payment Interfaces: Multi-step payment wizards
Chart Components: Dynamic data visualization

SSE Implementation

typescript

// Real-time balance updates
/api/sse/balance/{accountId}

// Transaction status updates
/api/sse/transactions/{transactionId}

// System alerts
/api/sse/alerts/{userId}

Dynamic UI Features

Live Balance Updates: WebSocket connections
Transaction Status Indicators: Real-time status changes
Rule Validation Feedback: Instant validation results
Payment Progress Tracking: Step-by-step payment status

7. Message Queue Design (NATS)

Event Streaming Architecture

JetStream Configuration:
- Retention: WorkQueue for transactions
- Retention: Interest for notifications
- Max Age: 7 days for audit events
- Replicas: 3 for high availability

Consumer Groups

Balance Aggregation: Updates real-time balances
Audit Logging: Persists events to ClickHouse
Notification Dispatch: Sends alerts and notifications
Rule Evaluation: Triggers rule engine processing

Message Schemas

json

// Transaction Event
{
  "event_type": "transaction.created",
  "timestamp": "2024-01-01T12:00:00Z",
  "account_id": "uuid",
  "transaction_id": "uuid",
  "amount": "100.50",
  "currency": "USD",
  "metadata": {}
}

// Balance Update Event
{
  "event_type": "balance.updated",
  "timestamp": "2024-01-01T12:00:00Z",
  "account_id": "uuid",
  "previous_balance": "1000.00",
  "new_balance": "900.50",
  "change_reason": "transaction"
}

8. Caching Strategy (Redis)

Cache Patterns

Cache-Aside: For rule configurations
Write-Through: For real-time balances
Write-Behind: For session data
Refresh-Ahead: For frequently accessed account data

Cache Keys Design

// Hierarchical key structure
fintech:accounts:{account_id}:balance
fintech:customers:{customer_id}:profile
fintech:rules:{rule_type}:active
fintech:fees:{tier_id}:structure
fintech:sessions:{session_id}:data

Cache Expiration Strategy

Balance Data: 5 minutes TTL
Rule Cache: 1 hour TTL
Session Data: 30 minutes TTL
Configuration: 24 hours TTL

9. Real-time Features

Real-time Balance Aggregation

Transaction Processing: Updates pending balance immediately
Settlement Processing: Moves from pending to available
Redis Updates: Real-time balance cache updates
SSE Notifications: Push updates to connected clients
Audit Logging: Record all balance changes

Implementation Flow

Transaction → NATS Event → Balance Service → Redis Update → SSE Push → UI Update

10. Rule Engine Architecture

Rule Types

Validation Rules: Transaction limits, account status checks
Fee Rules: Fee calculation based on tiers and types
Alert Rules: Suspicious activity detection
Business Rules: Account opening requirements

Rule Configuration

json

{
  "rule_id": "uuid",
  "name": "Daily Transaction Limit",
  "type": "validation",
  "conditions": {
    "account_type": "checking",
    "daily_amount": {"$lte": 5000},
    "transaction_count": {"$lte": 50}
  },
  "actions": {
    "reject": true,
    "message": "Daily limit exceeded"
  },
  "effective_from": "2024-01-01T00:00:00Z",
  "effective_till": "2024-12-31T23:59:59Z"
}

Rule Evaluation Engine

CEL Expression Language: For complex rule conditions
Rule Chaining: Sequential rule evaluation
Performance Monitoring: Rule execution metrics
A/B Testing: Rule variant testing

11. Monitoring & Observability

Metrics Collection

Application Metrics: Prometheus metrics
Business Metrics: Custom dashboards in Metabase
System Metrics: Infrastructure monitoring
Performance Metrics: Response times, throughput

Dashboard Integration

Metabase Dashboard → PostgreSQL/ClickHouse → Real-time Data Sync

Alert Configuration

Balance Thresholds: Low balance alerts
Transaction Anomalies: Unusual transaction patterns
System Health: Service availability alerts
Performance Degradation: Response time alerts

12. Error Handling & Resilience

Error Handling Patterns

Circuit Breaker: Prevent cascade failures
Retry with Backoff: Transient error recovery
Dead Letter Queue: Failed message handling
Compensation Actions: Rollback mechanisms

Fault Tolerance

Service Mesh: Traffic management and security
Health Checks: Service availability monitoring
Graceful Degradation: Partial functionality during outages
Data Consistency: Eventual consistency patterns

13. Security Architecture

Authentication & Authorization

JWT Tokens: Stateless authentication
RBAC: Role-based access control
API Keys: Service-to-service authentication
OAuth 2.0: Third-party integrations

Data Protection

Encryption at Rest: Database encryption
Encryption in Transit: TLS/SSL everywhere
PII Tokenization: Sensitive data protection
Audit Logging: Comprehensive audit trails

14. Deployment Architecture

Container Orchestration

Docker Containers: Application packaging
Kubernetes: Container orchestration
Helm Charts: Application deployment
GitOps: Automated deployments

Environment Strategy

Development: Local development environment
Staging: Pre-production testing
Production: Multi-region deployment
DR: Disaster recovery environment

15. Data Synchronization

PostgreSQL to Metabase Sync

CDC (Change Data Capture): Real-time data streaming
ETL Pipeline: Batch data processing
Materialized Views: Pre-aggregated data
Data Validation: Consistency checks

Sync Architecture

PostgreSQL → CDC → Kafka/NATS → ETL Service → ClickHouse → Metabase

16. Performance Optimization

Database Optimization

Indexing Strategy: Query optimization
Partitioning: Large table management
Connection Pooling: Resource optimization
Read Replicas: Load distribution

Application Optimization

Connection Pooling: Database connections
Goroutine Pools: Concurrency management
Memory Management: Garbage collection tuning
Batch Processing: Bulk operations

17. UI Screen Designs & User Experience

Navigation Architecture

Main Navigation:
├── Dashboard (Overview)
├── Accounts
│   ├── Account List
│   ├── Account Details
│   └── Balance History
├── Cards
│   ├── Card Management
│   ├── Card Limits
│   └── Card Transactions
├── Transactions
│   ├── Transaction History
│   ├── Pending Transactions
│   └── Transaction Search
├── Payments
│   ├── Make Payment
│   ├── Payment History
│   └── Scheduled Payments
├── Reports
│   ├── Financial Reports
│   ├── Analytics Dashboard
│   └── Custom Reports
├── Settings
│   ├── Rule Management
│   ├── Fee Configuration
│   └── System Settings
└── Administration
    ├── Customer Management
    ├── Alert Configuration
    └── System Monitoring

Screen Designs

1. Dashboard (Main Overview)

┌─────────────────────────────────────────────────────────────────────┐
│ FinTech Platform                                    [User] [Settings]│
├─────────────────────────────────────────────────────────────────────┤
│                                                                     │
│ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐        │
│ │ Total Balance   │ │ Active Cards    │ │ Pending Trans   │        │
│ │ $125,432.50 ↗   │ │ 12 cards        │ │ 5 transactions  │        │
│ │ +2.3% from last │ │ 2 blocked       │ │ $2,450.00       │        │
│ └─────────────────┘ └─────────────────┘ └─────────────────┘        │
│                                                                     │
│ ┌─────────────────────────────────────────────────────────────────┐ │
│ │              Real-Time Transaction Stream                        │ │
│ │ ┌─────────────────────────────────────────────────────────────┐ │ │
│ │ │ ⚡ Live Transactions                           [Auto-refresh]│ │ │
│ │ │ 12:45:32 - Card Payment    -$45.99  [POSTED]              │ │ │
│ │ │ 12:44:15 - ATM Withdrawal  -$100.00 [PENDING]             │ │ │
│ │ │ 12:43:01 - Online Transfer +$500.00 [POSTED]              │ │ │
│ │ │ 12:42:33 - Fee Charge      -$2.50   [POSTED]              │ │ │
│ │ └─────────────────────────────────────────────────────────────┘ │ │
│ └─────────────────────────────────────────────────────────────────┘ │
│                                                                     │
│ ┌─────────────────┐ ┌─────────────────────────────────────────────┐ │
│ │ Quick Actions   │ │            Balance Trend Chart              │ │
│ │ [Make Payment]  │ │     $130K ┌─────────────────────────────┐   │ │
│ │ [Transfer]      │ │           │      ╭─╮                   │   │ │
│ │ [Add Card]      │ │     $125K │    ╭─╯ ╰─╮                 │   │ │
│ │ [View Reports]  │ │           │  ╭─╯     ╰─╮               │   │ │
│ │                 │ │     $120K │╭─╯         ╰─╮             │   │ │
│ │ System Status:  │ │           └─────────────────────────────┘   │ │
│ │ 🟢 All Systems  │ │             7 days    30 days   90 days    │ │
│ │    Operational  │ │                                             │ │
│ └─────────────────┘ └─────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────────┘

2. Account Management Screen

┌─────────────────────────────────────────────────────────────────────┐
│ Accounts > Account Details                      [Search] [+ New]     │
├─────────────────────────────────────────────────────────────────────┤
│                                                                     │
│ ┌─────────────────────────────────────────────────────────────────┐ │
│ │ Account: CHK-2024-001234        Status: 🟢 Active              │ │
│ │ Customer: John Doe              Type: Checking Account          │ │
│ │ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐   │ │
│ │ │ Available Bal   │ │ Pending Bal     │ │ Credit Limit    │   │ │
│ │ │ $12,450.75      │ │ $325.50         │ │ $5,000.00       │   │ │
│ │ │ [Real-time ⚡]  │ │ [2 pending]     │ │ [75% utilized]  │   │ │
│ │ └─────────────────┘ └─────────────────┘ └─────────────────┘   │ │
│ └─────────────────────────────────────────────────────────────────┘ │
│                                                                     │
│ ┌─────────────────────────────────────────────────────────────────┐ │
│ │ Transaction History                           [Export] [Filter] │ │
│ │ ┌─────────────────────────────────────────────────────────────┐ │ │
│ │ │Date       │Type          │Amount    │Status   │Reference    ││ │ │
│ │ │2024-01-15 │Card Payment  │-$45.99   │Posted   │TXN-4521456 ││ │ │
│ │ │2024-01-15 │ATM Withdraw  │-$100.00  │Pending  │TXN-4521457 ││ │ │
│ │ │2024-01-14 │Deposit       │+$1,200.00│Posted   │TXN-4521454 ││ │ │
│ │ │2024-01-14 │Fee Charge    │-$2.50    │Posted   │TXN-4521453 ││ │ │
│ │ │2024-01-13 │Transfer In   │+$500.00  │Posted   │TXN-4521451 ││ │ │
│ │ └─────────────────────────────────────────────────────────────┘ │ │
│ │ Showing 5 of 1,245 transactions    [1][2][3]...[25] [Next]    │ │
│ └─────────────────────────────────────────────────────────────────┘ │
│                                                                     │
│ ┌─────────────────┐ ┌─────────────────────────────────────────────┐ │
│ │ Account Actions │ │          Monthly Transaction Volume         │ │
│ │ [Block Account] │ │                                             │ │
│ │ [Adjust Limits] │ │ $15K ┌─────────────────────────────────┐    │ │
│ │ [Generate Stmt] │ │      │  ████                          │    │ │
│ │ [Close Account] │ │ $10K │  ████  ████                    │    │ │
│ │                 │ │      │  ████  ████  ████              │    │ │
│ │ Alerts:         │ │  $5K │  ████  ████  ████  ████        │    │ │
│ │ 🔔 2 new alerts │ │      └─────────────────────────────────┘    │ │
│ │   View Details  │ │       Jan    Feb    Mar    Apr             │ │
│ └─────────────────┘ └─────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────────┘

3. Real-Time Transaction Processing Screen

┌─────────────────────────────────────────────────────────────────────┐
│ Transactions > Live Processing                    [Pause] [Settings] │
├─────────────────────────────────────────────────────────────────────┤
│                                                                     │
│ ┌─────────────────────────────────────────────────────────────────┐ │
│ │ ⚡ Real-Time Transaction Stream                 [Auto-refresh ON]│ │
│ │ ┌─────────────────────────────────────────────────────────────┐ │ │
│ │ │Status│Time    │Account      │Type        │Amount    │Action ││ │ │
│ │ │🟡    │12:45:45│CHK-001234   │Card Pay    │-$67.89   │[View]││ │ │
│ │ │🟢    │12:45:32│SAV-005678   │Transfer In │+$1,000.00│[View]││ │ │
│ │ │🔴    │12:45:20│CHK-009876   │ATM Withdraw│-$500.00  │[Retry]││ │ │
│ │ │🟡    │12:45:15│CRD-112233   │Online Pay  │-$123.45  │[View]││ │ │
│ │ │🟢    │12:45:01│CHK-445566   │Deposit     │+$2,500.00│[View]││ │ │
│ │ │🟡    │12:44:58│SAV-778899   │Fee Charge  │-$5.00    │[View]││ │ │
│ │ └─────────────────────────────────────────────────────────────┘ │ │
│ │ Legend: 🟢 Posted  🟡 Pending  🔴 Failed                       │ │
│ └─────────────────────────────────────────────────────────────────┘ │
│                                                                     │
│ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────────────┐ │
│ │ Processing Stats│ │ Queue Status    │ │ Rule Engine Status      │ │
│ │ Throughput:     │ │ Pending: 45     │ │ Rules Evaluated: 1,247  │ │
│ │ 1,234 TPS       │ │ Processing: 12  │ │ Rules Triggered: 23     │ │
│ │                 │ │ Failed: 3       │ │ Avg Response: 15ms      │ │
│ │ Success Rate:   │ │ Retry Queue: 8  │ │ Cache Hit Rate: 94.5%   │ │
│ │ 99.7%           │ │                 │ │                         │ │
│ │                 │ │ [View Queue]    │ │ [View Rules]            │ │
│ │ Avg Latency:    │ │ [Drain Queue]   │ │ [Performance Metrics]   │ │
│ │ 125ms           │ │                 │ │                         │ │
│ └─────────────────┘ └─────────────────┘ └─────────────────────────┘ │
│                                                                     │
│ ┌─────────────────────────────────────────────────────────────────┐ │
│ │ Transaction Details (TXN-4521456)              [Close] [Actions]│ │
│ │ ┌─────────────────────────────────────────────────────────────┐ │ │
│ │ │ Account: CHK-001234          Amount: -$67.89               │ │ │
│ │ │ Type: Card Payment           Currency: USD                 │ │ │
│ │ │ Status: Pending → Posted     Merchant: Amazon.com          │ │ │
│ │ │ Created: 12:45:32           Posted: 12:45:45               │ │ │
│ │ │                                                            │ │ │
│ │ │ Rule Evaluations:                                          │ │ │
│ │ │ ✅ Daily Limit Check (passed)                             │ │ │
│ │ │ ✅ Fraud Detection (passed)                               │ │ │
│ │ │ ✅ Balance Validation (passed)                            │ │ │
│ │ │ ⚙️  Fee Calculation (applied: $0.25)                      │ │ │
│ │ └─────────────────────────────────────────────────────────────┘ │ │
│ └─────────────────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────────┘

4. Payment Processing Interface

┌─────────────────────────────────────────────────────────────────────┐
│ Payments > Make Payment                                   [History]  │
├─────────────────────────────────────────────────────────────────────┤
│                                                                     │
│ ┌─────────────────────────────────────────────────────────────────┐ │
│ │ Payment Wizard                                        Step 1 of 4│ │
│ │ ┌─────────────────────────────────────────────────────────────┐ │ │
│ │ │ From Account:                                               │ │ │
│ │ │ ┌─────────────────────────────────────────────────────────┐ │ │ │
│ │ │ │ ● CHK-001234 - Checking        Available: $12,450.75   │ │ │ │
│ │ │ │ ○ SAV-005678 - Savings         Available: $25,000.00   │ │ │ │
│ │ │ │ ○ CRD-112233 - Credit Card     Available: $3,750.00    │ │ │ │
│ │ │ └─────────────────────────────────────────────────────────┘ │ │ │
│ │ │                                                             │ │ │
│ │ │ To Account/Beneficiary:                                     │ │ │
│ │ │ ┌─────────────────────────────────────────────────────────┐ │ │ │
│ │ │ │ Account Number: [_________________]     [Validate]      │ │ │ │
│ │ │ │ ○ Internal Account  ● External Account                  │ │ │ │
│ │ │ │ Beneficiary Name: [_________________]                   │ │ │ │
│ │ │ │ Bank Name: [_________________]                          │ │ │ │
│ │ │ └─────────────────────────────────────────────────────────┘ │ │ │
│ │ │                                                             │ │ │
│ │ │ Amount: [$_________] USD          [Calculate Fees]         │ │ │ │
│ │ │ ┌─────────────────────────────────────────────────────────┐ │ │ │
│ │ │ │ Transfer Amount:        $1,000.00                       │ │ │ │
│ │ │ │ Processing Fee:         $2.50                           │ │ │ │
│ │ │ │ Total Debit:           $1,002.50                        │ │ │ │
│ │ │ └─────────────────────────────────────────────────────────┘ │ │ │
│ │ └─────────────────────────────────────────────────────────────┘ │ │
│ │                                           [Cancel] [Next Step] │ │
│ └─────────────────────────────────────────────────────────────────┘ │
│                                                                     │
│ ┌─────────────────────────────────────────────────────────────────┐ │
│ │ Recent Payments                                     [View All]   │ │
│ │ ┌─────────────────────────────────────────────────────────────┐ │ │
│ │ │Date       │To Account       │Amount     │Status    │Action  ││ │ │
│ │ │2024-01-15 │EXT-987654321   │$500.00    │Completed │[View] ││ │ │
│ │ │2024-01-14 │CHK-445566      │$1,200.00  │Completed │[View] ││ │ │
│ │ │2024-01-13 │EXT-123456789   │$750.00    │Failed    │[Retry]││ │ │
│ │ │2024-01-12 │SAV-778899      │$300.00    │Completed │[View] ││ │ │
│ │ └─────────────────────────────────────────────────────────────┘ │ │
│ └─────────────────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────────┘

5. Rule Engine Management Interface

┌─────────────────────────────────────────────────────────────────────┐
│ Settings > Rule Management                        [+ Create Rule]    │
├─────────────────────────────────────────────────────────────────────┤
│                                                                     │
│ ┌─────────────────────────────────────────────────────────────────┐ │
│ │ Active Rules Overview                           [Import] [Export]│ │
│ │ ┌─────────────────────────────────────────────────────────────┐ │ │
│ │ │Name              │Type      │Priority│Effective│Status│Actions││ │ │
│ │ │Daily Limit Check │Validation│High    │Active   │🟢    │[Edit] ││ │ │
│ │ │Fraud Detection   │Alert     │Critical│Active   │🟢    │[Edit] ││ │ │
│ │ │Fee Calculation   │Fee       │Medium  │Active   │🟢    │[Edit] ││ │ │
│ │ │Weekend Limit     │Validation│Low     │Scheduled│🟡    │[Edit] ││ │ │
│ │ │Large Transaction │Alert     │High    │Draft    │⚪    │[Edit] ││ │ │
│ │ └─────────────────────────────────────────────────────────────┘ │ │
│ └─────────────────────────────────────────────────────────────────┘ │
│                                                                     │
│ ┌─────────────────────────────────────────────────────────────────┐ │
│ │ Rule Editor: Daily Limit Check                    [Save] [Test]  │ │
│ │ ┌─────────────────────────────────────────────────────────────┐ │ │
│ │ │ Rule Configuration:                                         │ │ │
│ │ │ Name: [Daily Transaction Limit Check___________________]    │ │ │
│ │ │ Type: [Validation ▼]        Priority: [High ▼]             │ │ │
│ │ │                                                             │ │ │
│ │ │ Effective Period:                                           │ │ │
│ │ │ From: [2024-01-01] [00:00] To: [2024-12-31] [23:59]       │ │ │
│ │ │                                                             │ │ │
│ │ │ Conditions (JSON Editor):                                   │ │ │
│ │ │ ┌─────────────────────────────────────────────────────────┐ │ │ │
│ │ │ │{                                                        │ │ │ │
│ │ │ │  "account_type": "checking",                            │ │ │ │
│ │ │ │  "daily_amount": {"$lte": 5000},                        │ │ │ │
│ │ │ │  "transaction_count": {"$lte": 50},                     │ │ │ │
│ │ │ │  "time_window": "24h"                                   │ │ │ │
│ │ │ │}                                                        │ │ │ │
│ │ │ └─────────────────────────────────────────────────────────┘ │ │ │
│ │ │                                                             │ │ │
│ │ │ Actions:                                                    │ │ │
│ │ │ ┌─────────────────────────────────────────────────────────┐ │ │ │
│ │ │ │{                                                        │ │ │ │
│ │ │ │  "reject": true,                                        │ │ │ │
│ │ │ │  "message": "Daily transaction limit exceeded",         │ │ │ │
│ │ │ │  "alert_level": "warning",                              │ │ │ │
│ │ │ │  "notify_customer": true                                │ │ │ │
│ │ │ │}                                                        │ │ │ │
│ │ │ └─────────────────────────────────────────────────────────┘ │ │ │
│ │ └─────────────────────────────────────────────────────────────┘ │ │
│ └─────────────────────────────────────────────────────────────────┘ │
│                                                                     │
│ ┌─────────────────┐ ┌─────────────────────────────────────────────┐ │
│ │ Rule Performance│ │ Test Results                                │ │
│ │ Executions:     │ │ Test Case 1: ✅ Passed                     │ │
│ │ 1,247 today     │ │ Account: CHK-001234                         │ │
│ │                 │ │ Amount: $3,000 (under limit)                │ │
│ │ Avg Response:   │ │                                             │ │
│ │ 15ms            │ │ Test Case 2: ❌ Failed                      │ │
│ │                 │ │ Account: CHK-005678                         │ │
│ │ Success Rate:   │ │ Amount: $6,000 (exceeds limit)              │ │
│ │ 99.9%           │ │ Action: Transaction rejected                │ │
│ │                 │ │                                             │ │
│ │ [View Metrics]  │ │ [Run Full Test Suite]                      │ │
│ └─────────────────┘ └─────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────────┘

6. Fee Management Interface

┌─────────────────────────────────────────────────────────────────────┐
│ Settings > Fee Configuration                        [+ New Fee Tier] │
├─────────────────────────────────────────────────────────────────────┤
│                                                                     │
│ ┌─────────────────────────────────────────────────────────────────┐ │
│ │ Fee Tier Overview                                [Bulk Actions]  │ │
│ │ ┌─────────────────────────────────────────────────────────────┐ │ │
│ │ │Tier Name     │Type        │Effective Period│Status│Actions  ││ │ │
│ │ │Premium       │Customer    │2024-01-01 →    │🟢    │[Config] ││ │ │
│ │ │Standard      │Customer    │2024-01-01 →    │🟢    │[Config] ││ │ │
│ │ │Basic         │Customer    │2024-01-01 →    │🟢    │[Config] ││ │ │
│ │ │High Volume   │Transaction │2024-03-01 →    │🟡    │[Config] ││ │ │
│ │ │ATM Fees      │Account     │2024-01-01 →    │🟢    │[Config] ││ │ │
│ │ └─────────────────────────────────────────────────────────────┘ │ │
│ └─────────────────────────────────────────────────────────────────┘ │
│                                                                     │
│ ┌─────────────────────────────────────────────────────────────────┐ │
│ │ Fee Structure Editor: Premium Tier               [Save] [Preview]│ │
│ │ ┌─────────────────────────────────────────────────────────────┐ │ │
│ │ │ Basic Information:                                          │ │ │
│ │ │ Tier Name: [Premium Customer Tier__________________]        │ │ │
│ │ │ Type: [Customer ▼]      Currency: [USD ▼]                  │ │ │
│ │ │ Effective: [2024-01-01] to [2024-12-31]                    │ │ │
│ │ │                                                             │ │ │
│ │ │ Fee Structures:                                             │ │ │
│ │ │ ┌─────────────────────────────────────────────────────────┐ │ │ │
│ │ │ │Transaction Type   │Fee Type  │Amount   │Min   │Max     ││ │ │ │
│ │ │ │ATM Withdrawal     │Flat      │$0.00    │$0.00 │$0.00   ││ │ │ │
│ │ │ │Wire Transfer      │Flat      │$10.00   │$10.00│$25.00  ││ │ │ │
│ │ │ │Foreign Exchange   │Percentage│2.5%     │$2.00 │$50.00  ││ │ │ │
│ │ │ │Card Payment       │Percentage│0.1%     │$0.00 │$5.00   ││ │ │ │
│ │ │ │Overdraft          │Flat      │$0.00    │$0.00 │$0.00   ││ │ │ │
│ │ │ └─────────────────────────────────────────────────────────┘ │ │ │
│ │ │ [+ Add Fee Structure]                                       │ │ │
│ │ │                                                             │ │ │
│ │ │ Tier Conditions:                                            │ │ │
│ │ │ ┌─────────────────────────────────────────────────────────┐ │ │ │
│ │ │ │ ☑ Monthly balance > $10,000                             │ │ │ │
│ │ │ │ ☑ Account age > 12 months                               │ │ │ │
│ │ │ │ ☑ Monthly transactions > 20                             │ │ │ │
│ │ │ │ ☐ Credit score > 750                                    │ │ │ │
│ │ │ └─────────────────────────────────────────────────────────┘ │ │ │
│ │ └─────────────────────────────────────────────────────────────┘ │ │
│ └─────────────────────────────────────────────────────────────────┘ │
│                                                                     │
│ ┌─────────────────┐ ┌─────────────────────────────────────────────┐ │
│ │ Fee Calculator  │ │ Revenue Impact Analysis                     │ │
│ │ Test Transaction│ │                                             │ │
│ │ Type: [Wire ▼]  │ │ Current Month Revenue: $45,230              │ │
│ │ Amount: [$500]  │ │ Projected Impact: +$2,150                   │ │
│ │ Customer: [Prem]│ │                                             │ │
│ │                 │ │ Fee Distribution:                           │ │
│ │ Calculated Fee: │ │ ┌─────────────────────────────────────────┐ │ │
│ │ $10.00 (Flat)   │ │ │ Wire Transfer  ████████████  45%        │ │ │
│ │                 │ │ │ FX Fees       ███████      28%        │ │ │
│ │ [Calculate]     │ │ │ Card Fees     █████        20%        │ │ │
│ │ [Reset]         │ │ │ Other         ██           7%         │ │ │
│ │                 │ │ └─────────────────────────────────────────┘ │ │
│ └─────────────────┘ └─────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────────┘

7. Metabase Integration Dashboard

┌─────────────────────────────────────────────────────────────────────┐
│ Reports > Analytics Dashboard                      [Full Screen] [⚙] │
├─────────────────────────────────────────────────────────────────────┤
│                                                                     │
│ ┌─────────────────────────────────────────────────────────────────┐ │
│ │ 📊 Embedded Metabase Dashboard                    [Refresh Data]│ │
│ │ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐   │ │
│ │ │ Total Revenue   │ │ Transaction Vol │ │ Active Customers│   │ │
│ │ │ $2.4M          │ │ 1.2M transactions│ │ 45,670 users    │   │ │
│ │ │ ↗ +15.3%       │ │ ↗ +8.7%         │ │ ↗ +5.2%        │   │ │
│ │ └─────────────────┘ └─────────────────┘ └─────────────────┘   │ │
│ │                                                             │ │
│ │ ┌─────────────────────────────────────────────────────────┐   │ │
│ │ │          Transaction Volume Trend (Last 30 Days)        │   │ │
│ │ │ 50K ┌─────────────────────────────────────────────────┐ │   │ │
│ │ │     │     ╭─╮                 ╭─╮                    │ │   │ │
│ │ │ 40K │   ╭─╯ ╰─╮             ╭─╯ ╰─╮                  │ │   │ │
│ │ │     │ ╭─╯     ╰─╮         ╭─╯     ╰─╮                │ │   │ │
│ │ │ 30K │╭╯         ╰─╮     ╭─╯         ╰─╮              │ │   │ │
│ │ │     └─────────────────────────────────────────────────┘ │   │ │
│ │ │       Week 1  Week 2  Week 3  Week 4  Week 5         │   │ │
│ │ └─────────────────────────────────────────────────────────┘   │ │
│ │                                                             │ │
│ │ ┌─────────────────┐ ┌─────────────────────────────────────┐   │ │
│ │ │ Top Merchants   │ │       Revenue by Product Type       │   │ │
│ │ │ 1. Amazon.com   │ │ ┌─────────────────────────────────┐ │   │ │
│ │ │    $145K (12%)  │ │ │ Checking    ████████████  52%   │ │   │ │
│ │ │ 2. Walmart      │ │ │ Savings     ██████        28%   │ │   │ │
│ │ │    $98K (8%)    │ │ │ Credit Card ████          15%   │ │   │ │
│ │ │ 3. Gas Stations │ │ │ Prepaid     █             5%    │ │   │ │
│ │ │    $87K (7%)    │ │ └─────────────────────────────────┘ │   │ │
│ │ │ 4. Grocery      │ │                                     │   │ │
│ │ │    $76K (6%)    │ │                                     │   │ │
│ │ │ [View All]      │ │ [Drill Down]                        │   │ │
│ │ └─────────────────┘ └─────────────────────────────────────┘   │ │
│ └─────────────────────────────────────────────────────────────┘ │
│                                                                 │
│ ┌─────────────────────────────────────────────────────────────┐ │
│ │ Custom Report Builder                           [Save Report]│ │
│ │ ┌─────────────────────────────────────────────────────────┐ │ │
│ │ │ Data Source: [PostgreSQL ▼]  [ClickHouse ▼]            │ │ │
│ │ │ Table: [transactions ▼]                                 │ │ │
│ │ │                                                         │ │ │
│ │ │ Filters:                                                │ │ │
│ │ │ Date Range: [Last 30 Days ▼]                           │ │ │
│ │ │ Account Type: [All ▼]                                   │ │ │
│ │ │ Transaction Status: [Posted ▼]                          │ │ │
│ │ │                                                         │ │ │
│ │ │ Group By: [Account Type] [Transaction Type]             │ │ │
│ │ │ Metrics: [Count] [Sum] [Average]                        │ │ │
│ │ │                                                         │ │ │
│ │ │ [Generate Report] [Schedule] [Export]                   │ │ │
│ │ └─────────────────────────────────────────────────────────┘ │ │
│ └─────────────────────────────────────────────────────────────┘ │
└─────────────────────────────────────────────────────────────────┘

#### 8. Real-Time Monitoring Dashboard

┌─────────────────────────────────────────────────────────────────────┐ │ Administration > System Monitoring [Auto-refresh 5s]│ ├─────────────────────────────────────────────────────────────────────┤ │ │ │ ┌─────────────────────────────────────────────────────────────────┐ │ │ │ System Health Overview 🟢 All Green │ │ │ │ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────┐ │ │ │ │ │ API Gateway │ │ Microservices │ │ Database Cluster│ │ │ │ │ │ 🟢 Operational │ │ 🟢 12/12 Running│ │ 🟢 All Healthy │ │ │ │ │ │ 99.9% Uptime │ │ 0 Alerts │ │ 0 Slow Queries │ │ │ │ │ │ 1.2K RPS │ │ Avg: 45ms │ │ Connections: 85%│ │ │ │ │ └─────────────────┘ └─────────────────┘ └─────────────────┘ │ │ │ └─────────────────────────────────────────────────────────────────┘ │ │ │ │ ┌─────────────────────────────────────────────────────────────────┐ │ │ │ Service Performance Metrics [Last 1 Hour] │ │ │ │ ┌─────────────────────────────────────────────────────────────┐ │ │ │ │ │Service │CPU%│Memory%│Requests│Latency│Errors│Status ││ │ │ │ │ │Account Svc │15% │45% │450/min │25ms │0 │🟢 ││ │ │ │ │ │Transaction Svc│28% │62% │1.2K/min│35ms │2 │🟢 ││ │ │ │ │ │Payment Svc │12% │38% │200/min │40ms │0 │🟢 ││ │ │ │ │ │Rule Engine │35% │55% │800/min │15ms │1 │🟢 ││ │ │ │ │ │Fee Service │8% │25% │150/min │20ms │0 │🟢 ││ │ │ │ │ │Notification │5% │20% │300/min │10ms │0 │🟢 ││ │ │ │ │ └─────────────────────────────────────────────────────────────┘ │ │ │ └─────────────────────────────────────────────────────────────────┘ │ │ │ │ ┌─────────────────┐ ┌─────────────────┐ ┌─────────────────────────┐ │ │ │ Message Queue │ │ Cache Status │ │ Database Performance │ │ │ │ NATS JetStream │ │ Redis Cluster │ │ PostgreSQL + ClickHouse │ │ │ │ │ │ │ │ │ │ │ │ Messages/sec: │ │ Hit Rate: 94.5% │ │ Queries/sec: 2.4K │ │ │ │ 2,450 │ │ Memory: 68% │ │ Avg Query Time: 12ms │ │ │ │ │ │ Connections: 42 │ │ Active Connections: 85 │ │ │ │ Queue Depth: │ │ │ │ │ │ │ │ 45 messages │ │ Evictions: 0 │ │ Slow Queries: 0 │ │ │ │ │ │ Network I/O: │ │ Lock Waits: 2 │ │ │ │ Consumers: 12 │ │ 15 MB/s │ │ │ │ │ │ Status: 🟢 │ │ Status: 🟢 │ │ Status: 🟢 │ │ │ └─────────────────┘ └─────────────────┘ └─────────────────────────┘ │ │ │ │

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