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Fintech Banking System - Complete Architecture Blueprint

Table of Contents

  1. System Overview
  2. Dual Architecture Design
  3. Microservices Architecture
  4. Database Design (PostgreSQL)
  5. RBAC System for Bank Officers
  6. API Design
  7. Security Architecture
  8. AWS Services Integration
  9. Implementation Roadmap

System Overview

High-Level Architecture

graph TB
    subgraph "Customer-Facing Architecture"
        CWeb[Customer Web App]
        CMobile[Customer Mobile App]
        CAPI[Customer API Gateway]
    end
    
    subgraph "Bank Admin Architecture"
        AWeb[Admin Web Portal]
        AAPI[Admin API Gateway]
        RBAC[RBAC Service]
    end
    
    subgraph "Core Microservices"
        US[User Service]
        AS[Account Service]
        TS[Transaction Service]
        CS[Card Service]
        LS[Loan Service]
        IS[Investment Service]
        NS[Notification Service]
        FDS[Fraud Detection Service]
        COS[Compliance Service]
        ADS[Admin Service]
    end
    
    subgraph "Data Layer"
        PG[(PostgreSQL)]
        Redis[(Redis Cache)]
        S3[(AWS S3)]
    end
    
    subgraph "External Systems"
        NPCI[NPCI/UPI]
        RBI[RBI Systems]
        CB[Credit Bureaus]
        SMS[SMS Gateway]
    end
    
    CWeb --> CAPI
    CMobile --> CAPI
    AWeb --> AAPI
    
    CAPI --> US
    CAPI --> AS
    CAPI --> TS
    CAPI --> CS
    CAPI --> LS
    CAPI --> IS
    
    AAPI --> RBAC
    RBAC --> ADS
    AAPI --> US
    AAPI --> AS
    AAPI --> TS
    AAPI --> FDS
    AAPI --> COS
    
    US --> PG
    AS --> PG
    TS --> PG
    CS --> PG
    LS --> PG
    IS --> PG
    ADS --> PG
    
    US --> Redis
    AS --> Redis
    TS --> Redis
    
    NS --> SMS
    TS --> NPCI
    COS --> RBI
    LS --> CB
    
    FDS --> S3
    COS --> S3
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System Characteristics

  • High Availability: 99.99% uptime with multi-AZ deployment
  • Scalability: Handle 10M+ customers, 1M+ daily transactions
  • Security: PCI DSS Level 1, RBI compliance, end-to-end encryption
  • Performance: <200ms API response time, real-time transaction processing
  • Consistency: ACID compliance for financial transactions

Dual Architecture Design

Customer-Facing Architecture

graph TB
    subgraph "Customer Frontend"
        CWeb[Web Application<br/>React/Angular]
        CMobile[Mobile App<br/>React Native/Flutter]
        CPWA[Progressive Web App]
    end
    
    subgraph "Customer API Layer"
        CAPI[Customer API Gateway<br/>Kong/AWS API Gateway]
        CLB[Load Balancer<br/>Application Load Balancer]
        CAuth[Customer Authentication<br/>JWT + MFA]
    end
    
    subgraph "Customer Services"
        CUS[Customer User Service]
        CAS[Customer Account Service]
        CTS[Customer Transaction Service]
        CCS[Customer Card Service]
        CLS[Customer Loan Service]
        CIS[Customer Investment Service]
        CNS[Customer Notification Service]
    end
    
    CWeb --> CLB
    CMobile --> CLB
    CPWA --> CLB
    CLB --> CAPI
    CAPI --> CAuth
    CAuth --> CUS
    CAuth --> CAS
    CAuth --> CTS
    CAuth --> CCS
    CAuth --> CLS
    CAuth --> CIS
    CAuth --> CNS
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Bank Admin Architecture

graph TB
    subgraph "Admin Frontend"
        AWeb[Admin Web Portal<br/>React/Angular Dashboard]
        AMobile[Admin Mobile App<br/>For Field Officers]
    end
    
    subgraph "Admin API Layer"
        AAPI[Admin API Gateway<br/>Kong/AWS API Gateway]
        ALB[Load Balancer<br/>Application Load Balancer]
        AAuth[Admin Authentication<br/>JWT + RBAC]
    end
    
    subgraph "Admin Services"
        RBAC[RBAC Service<br/>Role-Based Access Control]
        AUS[Admin User Management]
        AAS[Admin Account Management]
        ATS[Admin Transaction Management]
        AFDS[Admin Fraud Detection]
        ACOS[Admin Compliance Service]
        ARS[Admin Reporting Service]
        AOPS[Admin Operations Service]
    end
    
    subgraph "Admin Roles"
        BM[Branch Manager]
        CO[Compliance Officer]
        FO[Fraud Officer]
        CSR[Customer Service Rep]
        SO[System Operator]
        AU[Auditor]
    end
    
    AWeb --> ALB
    AMobile --> ALB
    ALB --> AAPI
    AAPI --> AAuth
    AAuth --> RBAC
    
    RBAC --> BM
    RBAC --> CO
    RBAC --> FO
    RBAC --> CSR
    RBAC --> SO
    RBAC --> AU
    
    RBAC --> AUS
    RBAC --> AAS
    RBAC --> ATS
    RBAC --> AFDS
    RBAC --> ACOS
    RBAC --> ARS
    RBAC --> AOPS
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Microservices Architecture

Service Boundaries and Communication

graph TB
    subgraph "User Domain"
        US[User Service<br/>Registration, KYC, Profile]
        AS[Authentication Service<br/>Login, MFA, Sessions]
    end
    
    subgraph "Account Domain"
        ACS[Account Service<br/>Account Management, Balance]
        TS[Transaction Service<br/>Payments, Transfers]
        SS[Statement Service<br/>Account Statements]
    end
    
    subgraph "Card Domain"
        CS[Card Service<br/>Card Issuance, Management]
        CTS[Card Transaction Service<br/>Authorization, Processing]
    end
    
    subgraph "Lending Domain"
        LS[Loan Service<br/>Applications, Approvals]
        LPS[Loan Processing Service<br/>EMI, Collections]
    end
    
    subgraph "Investment Domain"
        IS[Investment Service<br/>Portfolio Management]
        MFS[Mutual Fund Service<br/>SIP, Redemptions]
    end
    
    subgraph "Support Domain"
        NS[Notification Service<br/>SMS, Email, Push]
        FDS[Fraud Detection Service<br/>ML-based Risk Assessment]
        COS[Compliance Service<br/>AML, Regulatory Reporting]
    end
    
    subgraph "Admin Domain"
        ADS[Admin Service<br/>User Management, Operations]
        RS[Reporting Service<br/>Analytics, Dashboards]
        CS[Configuration Service<br/>System Parameters]
    end
    
    subgraph "Event Bus"
        KB[Apache Kafka<br/>Event Streaming]
    end
    
    US --> KB
    ACS --> KB
    TS --> KB
    CS --> KB
    LS --> KB
    IS --> KB
    
    KB --> NS
    KB --> FDS
    KB --> COS
    KB --> ADS
    KB --> RS
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Event-Driven Communication Patterns

sequenceDiagram
    participant C as Customer
    participant TS as Transaction Service
    participant AS as Account Service
    participant FDS as Fraud Detection
    participant NS as Notification Service
    participant KB as Kafka
    
    C->>TS: Initiate Transfer
    TS->>FDS: Check Fraud Risk
    FDS-->>TS: Risk Score
    TS->>AS: Validate Accounts
    AS-->>TS: Account Details
    TS->>AS: Debit Source Account
    TS->>AS: Credit Target Account
    TS->>KB: Publish TransactionCompleted Event
    KB->>NS: Transaction Event
    KB->>FDS: Update ML Models
    NS->>C: Send Notification
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Database Design (PostgreSQL)

Database Schema Architecture

erDiagram
    USERS {
        uuid user_id PK
        varchar customer_id UK
        varchar email UK
        varchar phone UK
        varchar first_name
        varchar last_name
        date date_of_birth
        varchar pan_number UK
        varchar aadhaar_number UK
        varchar kyc_status
        timestamp kyc_verified_at
        varchar status
        timestamp created_at
        timestamp updated_at
    }
    
    USER_ADDRESSES {
        uuid address_id PK
        uuid user_id FK
        varchar address_type
        varchar address_line1
        varchar address_line2
        varchar city
        varchar state
        varchar postal_code
        varchar country
        boolean is_primary
        timestamp created_at
    }
    
    ACCOUNTS {
        uuid account_id PK
        varchar account_number UK
        uuid user_id FK
        uuid account_type_id FK
        decimal balance
        decimal available_balance
        varchar status
        date opened_date
        date closed_date
        varchar branch_code
        varchar ifsc_code
        timestamp created_at
        timestamp updated_at
    }
    
    ACCOUNT_TYPES {
        uuid type_id PK
        varchar type_code UK
        varchar type_name
        text description
        decimal min_balance
        decimal interest_rate
        boolean is_active
    }
    
    TRANSACTIONS {
        uuid transaction_id PK
        varchar transaction_ref UK
        uuid from_account_id FK
        uuid to_account_id FK
        uuid transaction_type_id FK
        decimal amount
        varchar currency
        text description
        varchar status
        timestamp processed_at
        timestamp created_at
        uuid created_by FK
        varchar channel
        inet ip_address
        text device_fingerprint
    }
    
    TRANSACTION_TYPES {
        uuid type_id PK
        varchar type_code UK
        varchar type_name
        varchar category
        text description
    }
    
    CARDS {
        uuid card_id PK
        varchar card_number UK
        varchar masked_card_number
        uuid account_id FK
        uuid product_id FK
        varchar cardholder_name
        date expiry_date
        varchar cvv_hash
        varchar pin_hash
        varchar status
        decimal daily_limit
        decimal monthly_limit
        date issued_date
        timestamp last_used_at
        timestamp created_at
    }
    
    CARD_PRODUCTS {
        uuid product_id PK
        varchar product_code UK
        varchar product_name
        varchar card_type
        decimal annual_fee
        decimal credit_limit_min
        decimal credit_limit_max
        boolean is_active
    }
    
    LOANS {
        uuid loan_id PK
        varchar loan_number UK
        uuid user_id FK
        uuid loan_type_id FK
        decimal principal_amount
        decimal interest_rate
        integer tenure_months
        decimal emi_amount
        decimal outstanding_amount
        varchar status
        date disbursement_date
        date maturity_date
        timestamp created_at
    }
    
    LOAN_TYPES {
        uuid type_id PK
        varchar type_code UK
        varchar type_name
        decimal min_amount
        decimal max_amount
        decimal min_interest_rate
        decimal max_interest_rate
        integer min_tenure
        integer max_tenure
        boolean is_active
    }
    
    ADMIN_USERS {
        uuid admin_id PK
        varchar employee_id UK
        varchar email UK
        varchar first_name
        varchar last_name
        varchar designation
        varchar department
        uuid role_id FK
        varchar status
        timestamp last_login
        timestamp created_at
        timestamp updated_at
    }
    
    ROLES {
        uuid role_id PK
        varchar role_name UK
        varchar role_code UK
        text description
        boolean is_active
        timestamp created_at
    }
    
    PERMISSIONS {
        uuid permission_id PK
        varchar permission_name UK
        varchar permission_code UK
        varchar resource
        varchar action
        text description
    }
    
    ROLE_PERMISSIONS {
        uuid role_id FK
        uuid permission_id FK
        timestamp created_at
    }
    
    AUDIT_LOGS {
        uuid audit_id PK
        varchar entity_type
        varchar entity_id
        varchar action
        jsonb old_values
        jsonb new_values
        uuid performed_by FK
        varchar user_type
        inet ip_address
        text user_agent
        timestamp created_at
    }
    
    USERS ||--o{ USER_ADDRESSES : has
    USERS ||--o{ ACCOUNTS : owns
    ACCOUNTS }o--|| ACCOUNT_TYPES : belongs_to
    ACCOUNTS ||--o{ TRANSACTIONS : source
    ACCOUNTS ||--o{ TRANSACTIONS : target
    TRANSACTIONS }o--|| TRANSACTION_TYPES : belongs_to
    ACCOUNTS ||--o{ CARDS : linked_to
    CARDS }o--|| CARD_PRODUCTS : belongs_to
    USERS ||--o{ LOANS : applies_for
    LOANS }o--|| LOAN_TYPES : belongs_to
    ADMIN_USERS }o--|| ROLES : assigned
    ROLES ||--o{ ROLE_PERMISSIONS : has
    PERMISSIONS ||--o{ ROLE_PERMISSIONS : granted_via
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PostgreSQL Specific Optimizations

-- Partitioning Strategy for Transactions (Monthly Partitions)
CREATE TABLE transactions_2024_01 PARTITION OF transactions
FOR VALUES FROM ('2024-01-01') TO ('2024-02-01');

CREATE TABLE transactions_2024_02 PARTITION OF transactions
FOR VALUES FROM ('2024-02-01') TO ('2024-03-01');

-- Indexes for Performance
CREATE INDEX CONCURRENTLY idx_transactions_account_date 
ON transactions (from_account_id, created_at DESC);

CREATE INDEX CONCURRENTLY idx_transactions_status_date 
ON transactions (status, created_at DESC);

CREATE INDEX CONCURRENTLY idx_users_customer_id 
ON users (customer_id);

CREATE INDEX CONCURRENTLY idx_accounts_user_status 
ON accounts (user_id, status);

-- Full-text search for transaction descriptions
CREATE INDEX CONCURRENTLY idx_transactions_description_fts 
ON transactions USING gin(to_tsvector('english', description));

-- Partial indexes for active records
CREATE INDEX CONCURRENTLY idx_users_active 
ON users (user_id) WHERE status = 'ACTIVE';

CREATE INDEX CONCURRENTLY idx_accounts_active 
ON accounts (account_id) WHERE status = 'ACTIVE';

RBAC System for Bank Officers

Role Hierarchy and Permissions

graph TB
    subgraph "Executive Level"
        CEO[CEO<br/>All Permissions]
        GM[General Manager<br/>Branch Operations]
        BM[Branch Manager<br/>Branch Level Control]
    end
    
    subgraph "Operations Level"
        OM[Operations Manager<br/>Daily Operations]
        CSM[Customer Service Manager<br/>Customer Issues]
        LM[Loan Manager<br/>Loan Operations]
    end
    
    subgraph "Specialist Roles"
        CO[Compliance Officer<br/>Regulatory Compliance]
        FO[Fraud Officer<br/>Fraud Investigation]
        AU[Auditor<br/>Audit & Review]
        RO[Risk Officer<br/>Risk Assessment]
    end
    
    subgraph "Front-line Staff"
        CSR[Customer Service Rep<br/>Customer Support]
        LO[Loan Officer<br/>Loan Processing]
        TO[Teller<br/>Basic Transactions]
        SO[System Operator<br/>System Maintenance]
    end
    
    CEO --> GM
    GM --> BM
    BM --> OM
    BM --> CSM
    BM --> LM
    
    OM --> CSR
    OM --> TO
    OM --> SO
    CSM --> CSR
    LM --> LO
    
    CEO --> CO
    CEO --> FO
    CEO --> AU
    CEO --> RO
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Permission Matrix

graph LR
    subgraph "Resources"
        UR[User Management]
        AR[Account Management]
        TR[Transaction Management]
        CR[Card Management]
        LR[Loan Management]
        RR[Reports & Analytics]
        SR[System Configuration]
        FR[Fraud Management]
        COR[Compliance Management]
    end
    
    subgraph "Actions"
        V[View]
        C[Create]
        U[Update]
        D[Delete]
        A[Approve]
        R[Reject]
        E[Export]
        I[Import]
    end
    
    subgraph "Role Examples"
        BM_ROLE[Branch Manager<br/>CRUD on all branch resources]
        CSR_ROLE[Customer Service Rep<br/>View/Update customer info]
        FO_ROLE[Fraud Officer<br/>Full fraud management access]
        AU_ROLE[Auditor<br/>Read-only access to all]
    end
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RBAC Implementation Schema

-- Roles with hierarchy support
CREATE TABLE roles (
    role_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    role_name VARCHAR(100) UNIQUE NOT NULL,
    role_code VARCHAR(50) UNIQUE NOT NULL,
    parent_role_id UUID REFERENCES roles(role_id),
    level INTEGER NOT NULL DEFAULT 1,
    description TEXT,
    is_active BOOLEAN DEFAULT TRUE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Permissions with resource-action mapping
CREATE TABLE permissions (
    permission_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    permission_name VARCHAR(100) UNIQUE NOT NULL,
    permission_code VARCHAR(50) UNIQUE NOT NULL,
    resource VARCHAR(50) NOT NULL, -- users, accounts, transactions, etc.
    action VARCHAR(20) NOT NULL,   -- create, read, update, delete, approve
    description TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Role-Permission mapping with conditions
CREATE TABLE role_permissions (
    role_id UUID REFERENCES roles(role_id),
    permission_id UUID REFERENCES permissions(permission_id),
    conditions JSONB, -- Additional conditions like branch_id, amount_limit
    granted_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    granted_by UUID REFERENCES admin_users(admin_id),
    PRIMARY KEY (role_id, permission_id)
);

-- Admin users with role assignment
CREATE TABLE admin_users (
    admin_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    employee_id VARCHAR(20) UNIQUE NOT NULL,
    email VARCHAR(255) UNIQUE NOT NULL,
    first_name VARCHAR(100) NOT NULL,
    last_name VARCHAR(100) NOT NULL,
    designation VARCHAR(100),
    department VARCHAR(100),
    branch_id UUID, -- For branch-specific access
    role_id UUID REFERENCES roles(role_id),
    manager_id UUID REFERENCES admin_users(admin_id),
    status VARCHAR(20) DEFAULT 'ACTIVE',
    last_login TIMESTAMP,
    password_hash VARCHAR(255) NOT NULL,
    mfa_enabled BOOLEAN DEFAULT FALSE,
    mfa_secret VARCHAR(255),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Session management for admin users
CREATE TABLE admin_sessions (
    session_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    admin_id UUID REFERENCES admin_users(admin_id),
    jwt_token_hash VARCHAR(255) NOT NULL,
    ip_address INET,
    user_agent TEXT,
    expires_at TIMESTAMP NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

API Design

Customer API Endpoints

# Authentication APIs
POST   /api/v1/auth/register           # Customer registration
POST   /api/v1/auth/login              # Customer login
POST   /api/v1/auth/verify-otp         # OTP verification
POST   /api/v1/auth/refresh-token      # Token refresh
POST   /api/v1/auth/logout             # Logout
POST   /api/v1/auth/forgot-password    # Password reset

# Account Management APIs
GET    /api/v1/accounts                # List customer accounts
GET    /api/v1/accounts/{id}           # Get account details
GET    /api/v1/accounts/{id}/balance   # Get account balance
GET    /api/v1/accounts/{id}/statement # Get account statement
POST   /api/v1/accounts                # Create new account

# Transaction APIs
GET    /api/v1/transactions            # List transactions
GET    /api/v1/transactions/{id}       # Get transaction details
POST   /api/v1/transactions/transfer   # Fund transfer
POST   /api/v1/transactions/payment    # Bill payment
GET    /api/v1/transactions/beneficiaries # List beneficiaries
POST   /api/v1/transactions/beneficiaries # Add beneficiary

# Card Management APIs
GET    /api/v1/cards                   # List customer cards
GET    /api/v1/cards/{id}              # Get card details
POST   /api/v1/cards                   # Apply for new card
PUT    /api/v1/cards/{id}/status       # Block/unblock card
PUT    /api/v1/cards/{id}/limits       # Update card limits
GET    /api/v1/cards/{id}/transactions # Card transaction history

# Loan APIs
GET    /api/v1/loans                   # List customer loans
GET    /api/v1/loans/{id}              # Get loan details
POST   /api/v1/loans/apply             # Apply for loan
GET    /api/v1/loans/{id}/schedule     # EMI schedule
POST   /api/v1/loans/{id}/payment      # Make EMI payment

# Investment APIs
GET    /api/v1/investments             # Portfolio overview
GET    /api/v1/investments/funds       # Available mutual funds
POST   /api/v1/investments/sip         # Start SIP
GET    /api/v1/investments/transactions # Investment transactions

Admin API Endpoints

# Admin Authentication
POST   /api/v1/admin/auth/login        # Admin login
POST   /api/v1/admin/auth/mfa-verify   # MFA verification
POST   /api/v1/admin/auth/refresh      # Token refresh
POST   /api/v1/admin/auth/logout       # Admin logout

# User Management APIs (RBAC Protected)
GET    /api/v1/admin/users             # List customers
GET    /api/v1/admin/users/{id}        # Get customer details
PUT    /api/v1/admin/users/{id}/status # Update customer status
GET    /api/v1/admin/users/{id}/kyc    # KYC documents
PUT    /api/v1/admin/users/{id}/kyc    # Approve/reject KYC

# Account Management APIs
GET    /api/v1/admin/accounts          # List all accounts
GET    /api/v1/admin/accounts/{id}     # Account details
PUT    /api/v1/admin/accounts/{id}/status # Account status update
GET    /api/v1/admin/accounts/{id}/audit # Account audit trail

# Transaction Management APIs
GET    /api/v1/admin/transactions      # List all transactions
GET    /api/v1/admin/transactions/{id} # Transaction details
PUT    /api/v1/admin/transactions/{id}/status # Approve/reject transaction
GET    /api/v1/admin/transactions/suspicious # Flagged transactions

# Fraud Management APIs
GET    /api/v1/admin/fraud/alerts      # Fraud alerts
GET    /api/v1/admin/fraud/cases       # Fraud cases
PUT    /api/v1/admin/fraud/cases/{id}  # Update case status
GET    /api/v1/admin/fraud/patterns    # Fraud patterns

# Compliance APIs
GET    /api/v1/admin/compliance/reports # Compliance reports
POST   /api/v1/admin/compliance/aml    # AML report generation
GET    /api/v1/admin/compliance/audit  # Audit logs
POST   /api/v1/admin/compliance/ctr    # CTR report

# Analytics & Reporting APIs
GET    /api/v1/admin/analytics/dashboard # Dashboard metrics
GET    /api/v1/admin/analytics/transactions # Transaction analytics
GET    /api/v1/admin/analytics/customers # Customer analytics
POST   /api/v1/admin/reports/generate  # Generate custom reports

# System Configuration APIs
GET    /api/v1/admin/config/parameters # System parameters
PUT    /api/v1/admin/config/parameters # Update parameters
GET    /api/v1/admin/config/limits     # Transaction limits
PUT    /api/v1/admin/config/limits     # Update limits

Security Architecture

Authentication Flow

sequenceDiagram
    participant C as Customer/Admin
    participant FE as Frontend
    participant AG as API Gateway
    participant AS as Auth Service
    participant DB as PostgreSQL
    participant Redis as Redis Cache
    
    C->>FE: Login Request
    FE->>AG: POST /auth/login
    AG->>AS: Validate Credentials
    AS->>DB: Check User/Admin
    DB-->>AS: User Details
    AS->>AS: Generate JWT + Refresh Token
    AS->>Redis: Store Session
    AS-->>AG: JWT + Refresh Token
    AG-->>FE: Authentication Response
    FE->>FE: Store JWT in HttpOnly Cookie
    
    Note over C,Redis: Subsequent API Calls
    C->>FE: API Request
    FE->>AG: Request with JWT
    AG->>AG: Validate JWT
    AG->>Redis: Check Session
    Redis-->>AG: Session Valid
    AG->>AS: Check Permissions (Admin)
    AS-->>AG: Permission Result
    AG->>AG: Route to Service
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Data Encryption Strategy

graph TB
    subgraph "Encryption at Rest"
        DB[PostgreSQL<br/>AES-256 Encryption]
        Files[File Storage<br/>S3 Server-Side Encryption]
        Backup[Database Backups<br/>Encrypted Snapshots]
    end
    
    subgraph "Encryption in Transit"
        TLS[TLS 1.3<br/>All API Communications]
        VPN[VPN Tunnels<br/>Internal Service Communication]
        WSS[WebSocket Secure<br/>Real-time Updates]
    end
    
    subgraph "Application-Level Encryption"
        PII[PII Data<br/>Field-Level Encryption]
        Cards[Card Numbers<br/>Tokenization]
        Passwords[Passwords<br/>bcrypt Hashing]
    end
    
    subgraph "Key Management"
        KMS[AWS KMS<br/>Key Rotation]
        HSM[Hardware Security Module<br/>Sensitive Operations]
        Vault[HashiCorp Vault<br/>Secret Management]
    end
    
    DB --> KMS
    Files --> KMS
    PII --> KMS
    Cards --> HSM
    Passwords --> Vault
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AWS Services Integration

Core AWS Services Stack

graph TB
    subgraph "Compute Services"
        EKS[Amazon EKS<br/>Kubernetes Orchestration]
        Fargate[AWS Fargate<br/>Serverless Containers]
        Lambda[AWS Lambda<br/>Event Processing]
        EC2[Amazon EC2<br/>Auto Scaling Groups]
    end
    
    subgraph "Database Services"
        RDS[Amazon RDS PostgreSQL<br/>Multi-AZ Deployment]
        ElastiCache[Amazon ElastiCache<br/>Redis Cluster]
        DynamoDB[Amazon DynamoDB<br/>Session Storage]
    end
    
    subgraph "Storage Services"
        S3[Amazon S3<br/>Document Storage]
        EFS[Amazon EFS<br/>Shared File System]
        EBS[Amazon EBS<br/>Block Storage]
    end
    
    subgraph "Networking & Security"
        VPC[Amazon VPC<br/>Network Isolation]
        ALB[Application Load Balancer<br/>Traffic Distribution]
        WAF[AWS WAF<br/>Web Application Firewall]
        Shield[AWS Shield<br/>DDoS Protection]
        KMS[AWS KMS<br/>Key Management]
    end
    
    subgraph "Messaging & Analytics"
        MSK[Amazon MSK<br/>Apache Kafka]
        SQS[Amazon SQS<br/>Message Queuing]
        SNS[Amazon SNS<br/>Notifications]
        Kinesis[Amazon Kinesis<br/>Data Streaming]
        QuickSight[Amazon QuickSight<br/>Business Intelligence]
    end
    
    subgraph "Monitoring & Operations"
        CloudWatch[Amazon CloudWatch<br/>Monitoring & Logging]
        XRay[AWS X-Ray<br/>Distributed Tracing]
        Config[AWS Config<br/>Compliance Monitoring]
        CloudTrail[AWS CloudTrail<br/>API Audit Logging]
    end
    
    EKS --> RDS
    EKS --> ElastiCache
    EKS --> S3
    Lambda --> MSK
    Lambda --> SQS
    
    ALB --> EKS
    WAF --> ALB
    Shield --> WAF
    
    CloudWatch --> EKS
    XRay --> EKS
    CloudTrail --> S3
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Implementation Roadmap

Phase 1: Foundation (Weeks 1-4)

  • Set up AWS infrastructure (VPC, EKS, RDS)
  • Implement basic PostgreSQL schema
  • Create User Service with authentication
  • Set up API Gateway and basic security
  • Implement RBAC system for admin users

Phase 2: Core Banking (Weeks 5-8)

  • Implement Account Service
  • Build Transaction Service with Saga pattern
  • Create basic admin portal
  • Implement fraud detection framework
  • Set up monitoring and logging

Phase 3: Advanced Features (Weeks 9-12)

  • Implement Card Service
  • Build Loan Service
  • Create Investment Service
  • Implement compliance and reporting
  • Add real-time notifications

Phase 4: Production Ready (Weeks 13-16)

  • Performance optimization
  • Security hardening
  • Load testing and scaling
  • Disaster recovery setup
  • Production deployment

Technology Stack Summary

Backend Framework: Spring Boot 3.x with Java 17 Database: PostgreSQL 15+ with Redis for caching Message Broker: Apache Kafka (Amazon MSK) Container Orchestration: Kubernetes (Amazon EKS) API Gateway: Kong or AWS API Gateway Frontend: React/Angular for web, React Native for mobile Security: JWT tokens, OAuth 2.0, MFA Monitoring: CloudWatch, X-Ray, ELK Stack CI/CD: GitHub Actions or AWS CodePipeline Infrastructure: Terraform for IaC

This blueprint provides a comprehensive foundation for building a production-ready fintech banking system with dual architecture, robust RBAC, and industry-standard security practices.