SpringBoot App with Azure Cloud Solution

Great! You're diving into a comprehensive architecture exercise for a Personal Banking Platform using Spring Boot Microservices on Azure Cloud with a focus on:

✅ High-level architecture✅ Enterprise risk management (40 risks categorized)✅ Full Azure service integration (AKS, Istio, Azure AD, Traffic Manager, SQL, DevOps, etc.)✅ Secure, compliant, and scalable deployment

Here's how we'll structure this for you step by step:

✅ 1. Use Case Overview: Personal Banking Platform

Key capabilities:

• Account Management

• Fund Transfers

• Bill Payments

• Personal Loans

• Credit/Debit Card Services

• KYC/AML

• Notifications

• Customer Support Chatbot

🧱 2. Microservices Breakdown

Service	Description
AccountService	Manages customer accounts and balances
TransactionService	Handles transfers, deposits, and withdrawals
PaymentService	Processes utility, bill, and EMI payments
LoanService	Personal loan applications and processing
CardService	Credit/debit card issuance and maintenance
CustomerService	Customer onboarding, profile updates
KYCService	Integrates with external KYC providers
NotificationService	Emails, SMS, push notifications
ChatbotService	AI-powered banking assistant
ComplianceService	Handles regulatory checks (e.g., AML)
AuditService	Logs events for traceability

Each microservice is developed using Spring Boot and deployed independently in AKS.

☁️ 3. Azure Cloud Architecture Overview

Core Azure Services Used:

• AKS (Azure Kubernetes Service) with Istio service mesh

• Azure AD for user and service authentication

• Azure API Management for external/internal API gateway

• Azure SQL – one database per microservice

• Azure Traffic Manager – DNS load balancing across regions

• Azure Monitor, Log Analytics, App Insights – monitoring and telemetry

• Azure DevOps Pipelines – CI/CD to deploy services into AKS

• Azure Key Vault – secrets and credential management

• Azure Firewall, NSG, VNET/Subnets – secure network architecture

• Azure Private Link / Service Endpoint – secure PaaS access

• Multi-AZ Deployment – for HA using availability zones

🛡️ 4. Enterprise Risk Register – Top 40 Risks by Category

Category	Risk Examples
Business	Market volatility, business model failure, competitive disruption, unmet customer needs
Operations	Process gaps, manual errors, dependency on third parties, capacity constraints
Technology	Downtime, software bugs, tech obsolescence, misconfiguration
People	Talent attrition, lack of skillsets, insider threats, misaligned incentives
Security	DDoS attacks, data breaches, credential theft, insecure APIs
Compliance	Non-adherence to RBI/SEBI rules, GDPR, SOX non-compliance
Regulatory	KYC/AML lapses, audit failure, unreported transactions, fines from authorities

Each risk will be tagged with a mitigation plan (e.g., HA design, zero-trust model, observability, DevSecOps, BCP/DR strategies).

🧭 5. High-Level Architecture Diagram Will Include:

• VNET, Subnets (App, Data, DMZ)

• AKS cluster with Istio mesh

• Microservices with Azure SQL behind each

• Azure AD integration via OAuth2/JWT for users + services

• API Gateway (APIM) in front of Istio Gateway

• Azure DevOps CI/CD pipeline pushing to AKS via ACR

• Azure Monitor + Log Analytics for observability

• Azure Firewall + NSG for security

• Multi-AZ across AKS nodes

• Service-to-service secure mTLS communication via Istio

• Kafka for asynchronous events (e.g., transaction logs)

🔄 6. DevOps Lifecycle Integration

• Source Control: Azure Repos or GitHub

• CI Pipeline: Build Spring Boot microservices, run unit/integration tests

• Image Build: Docker container creation → Push to Azure Container Registry

• CD Pipeline: Helm/Kustomize deployment to AKS using Azure DevOps release pipeline

• Monitoring: Alerts to Teams/email via Azure Monitor alerts

Here’s a text-based end-to-end architecture flow showing how a user interacts with a Personal Banking Platform, covering each Spring Boot microservice, its integration with Azure services, Kafka, and deployment on Azure Kubernetes Service (AKS).

🧑‍💻 User Journey: Accessing and Using Personal Banking Platform

🔐 Step 1: User Authentication

• User opens the banking web/mobile app

• App sends request to API Gateway (Azure API Management)

• API Gateway routes to Istio Ingress Gateway (AKS)

• Istio directs traffic to AuthService

AuthService

• Authenticates via Azure AD B2C / OAuth2

• Issues JWT token

• Logs authentication event to Kafka (auth-events topic)

🧾 Step 2: Account Dashboard Fetch

• User accesses the dashboard

• Frontend sends request to CustomerService via APIM → Istio

CustomerService

• Validates JWT via Azure AD

• Retrieves profile from Azure SQL (CustomerDB)

• Calls AccountService to fetch accounts

AccountService

• Queries Azure SQL (AccountDB) for account balances

• Publishes account-accessed event to Kafka

💸 Step 3: Fund Transfer

User initiates a transfer between accounts.

TransactionService

• Validates source/destination

• Records transaction in Azure SQL (TransactionDB)

• Calls AccountService for balance updates

• Publishes transaction-created event to Kafka (transaction-events)

• Sends notification request to NotificationService

NotificationService

• Sends SMS/email via 3rd party

• Logs activity in Azure SQL (NotificationDB)

• Sends delivery event to Kafka

🧾 Step 4: Bill Payment / Loan Application

• Bill payment hits PaymentService

• Loan request goes to LoanService

• Both services persist data to their own Azure SQL

• Each publishes events to Kafka

LoanService might interact with:

• KYCService → to validate identity

• ComplianceService → for AML check

• Both use external APIs via secure egress

🔁 Step 5: Async Processing and Event Flow

• All microservices publish events to Kafka Topics

• Kafka used for:

  • Auditing (AuditService)

  • Analytics ingestion

  • Notification triggers

• Each service subscribes to relevant topics

🛠️ Step 6: Deployment Pipeline (Azure DevOps)

• Code pushed to Git

• Azure DevOps CI:

  • Runs unit/integration tests

  • Builds Docker image

  • Pushes to Azure Container Registry (ACR)

• Azure DevOps CD:

  • Deploys via Helm to AKS

  • Updates Istio VirtualService & DestinationRule

📡 Monitoring & Security

Observability

• All services emit telemetry to Azure Monitor and Application Insights

• Centralized logs in Log Analytics

• Alerts via Azure Alerts

Security

• mTLS between services (Istio mesh)

• Azure AD for identity and RBAC

• Azure Key Vault for secrets

• NSG + Azure Firewall + Private VNET/Subnet

• Egress policies for calling 3rd party APIs

🧩 Microservice to Azure Mapping Summary

Microservice	DB	Kafka Topics	Azure Services Used
CustomerService	Azure SQL	customer-events	Azure AD, Monitor
AccountService	Azure SQL	account-events	ACR, Key Vault
TransactionService	Azure SQL	transaction-events	Kafka, DevOps
PaymentService	Azure SQL	payment-events	Istio, VNET/Subnet
LoanService	Azure SQL	loan-events	API Mgmt, Firewall
NotificationService	Azure SQL	notification-events	Log Analytics
ComplianceService	Azure SQL	compliance-events	Azure AD
KYCService	Azure SQL	kyc-events	Azure DevOps
AuditService	Azure SQL	audit-events	Azure Monitor