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Backend for Frontend (BFF) pattern with Spring Microservices allows you to create specialized backend layers tailored to specific client needs (e.g., mobile vs. web). Some apps built by Microservices are Uber, Airbnb,Amazon, eBay and Netflix .



or spring webApis you don't need the UI

you could follow a project structure:

apigateway
notificationservice
profileservice
order service
k8s
eventbus
mobileBFF
web UI/Client (React/Angular/Vue app) etc



Tools and services
intelliJ idea /Vscode
Jdk 25
Maven or Gradle
Docker for building to cloud
MySQL
android studio for mobile
PostgreSQL
Zipkin
openfeign
Prometheus
Loki
Keycloak
mybatis
eureka
Grafana

Open a GitHub account and explore the following Opensource codes by searching

in summary each functionality is a service in Microservices you have to split it as many as you want to implement



if you are a beginner you can look at the guide below 👇.



https://www.nairaland.com/7385642/spring-boot-tutorial-beginners

Assuming you are giving a project to create a banking application using API from big vendors in Spring boot Microservices you split it into different service depending on what you want following a good RPD.


banking-platform/
│
├── api-gateway/ // Spring Cloud Gateway. Routing, auth, rate limiting, CORS
│ └── src/main/java/com/bank/gateway
│
├── service-registry/ // Eureka or Consul for service discovery
│ └── src/main/java/com/bank/registry
│
├── config-server/ // Spring Cloud Config for centralized config
│ └── src/main/resources/config
│
├── bff-mobile/ // Backend for Frontend for mobile app
│ └── src/main/java/com/bank/bff/mobile
│
├── bff-web/ // BFF for web client
│ └── src/main/java/com/bank/bff/web
│
├── account-service/ // Core domain: accounts, balance, KYC
│ ├── src/main/java/com/bank/account
│ ├── src/main/resources/db/migration // Flyway/Liquibase
│
├── transaction-service/ // Payments, transfers, transaction history
│ └── src/main/java/com/bank/transaction
│
├── loan-service/ // Loan origination, repayment, status
│ └── src/main/java/com/bank/loan
│
├── notification-service/ // Email, SMS, push via Kafka events
│ └── src/main/java/com/bank/notification
│
├── fraud-service/ // Fraud detection, async event consumer
│ └── src/main/java/com/bank/fraud
│
├── shared-libraries/ // Common DTOs, exceptions, utils, security config
│ ├── common-dto/
│ ├── common-security/
│ └── common-kafka/
│
├── docker/ // Dockerfiles, docker-compose for local dev
│ └── docker-compose.yml
│
└── pom.xml / build.gradle // Parent POM/Gradle with dependency management

For an e-commerce app in Spring Boot microservices, you structure it around e-commerce domains: catalog, cart, order, payment, etc. Each domain gets its own service, DB, and deploy pipeline.




ecommerce-platform/
│
├── api-gateway/ // Spring Cloud Gateway. Routing, auth, rate limiting
│ └── src/main/java/com/shop/gateway
│
├── service-registry/ // Eureka/Consul for service discovery
│
├── config-server/ // Centralized config with Spring Cloud Config
│
├── bff-web/ // BFF for React/Vue web app
├── bff-mobile/ // BFF for mobile app
│
├── product-service/ // Product catalog, categories, inventory
│ ├── src/main/java/com/shop/product
│ └── src/main/resources/db/migration
│
├── cart-service/ // Shopping cart, session management
│ └── src/main/java/com/shop/cart
│
├── order-service/ // Order creation, status, history
│ └── src/main/java/com/shop/order
│
├── payment-service/ // Stripe/PayPal integration, payment status
│ └── src/main/java/com/shop/payment
│
├── user-service/ // User profiles, addresses, auth data
│ └── src/main/java/com/shop/user
│
├── inventory-service/ // Stock levels, reservations, stock events
│ └── src/main/java/com/shop/inventory
│
├── notification-service/ // Email, SMS, push notifications
│ └── src/main/java/com/shop/notification
│
├── search-service/ // Elasticsearch indexing for product search
│ └── src/main/java/com/shop/search
│
├── shared-libraries/ // Common DTOs, exceptions, Feign clients, utils
│ ├── common-dto/
│ ├── common-security/
│ └── common-kafka/
│
├── docker/ // docker-compose.yml for local dev
│ └── docker-compose.yml
│
└── pom.xml // Parent POM with dependency management

Kudos on yr tutorial, always wanted to learn Java but c# took me away

trytillmake:
Kudos on yr tutorial, always wanted to learn Java but c# took me away

Thanks java and C# are easy languages just like enjoying sweet while reading. This guide was advanced but I tried my best to make it easier.

trytillmake:
Kudos on yr tutorial, always wanted to learn Java but c# took me away

your website is using ASP.NET MVC 4 and plesk for cpanel hosting seem you have been a . NET developer for years.

For an ERP website, the structure is similar to other microservices setups but heavier on master data, RBAC, and audit. The "website" part is the frontend + BFF that talks to your ERP services. Multi-tenancy tenantId on every table + filter at DB level
Key difference from social/e-commerce



erp-website/
│
├── frontend-web/ // React/Angular/Vue app. Admin dashboard, forms, reports
│ └── src/
│
├── api-gateway/ // Spring Cloud Gateway. JWT validation, routing, rate limiting
│ └── src/main/java/com/erp/gateway
│
├── bff-web/ // BFF for the website. Aggregates data for dashboards/forms
│ └── src/main/java/com/erp/bff/web
│
├── discovery-server/ // Eureka or Consul
├── config-server/ // Spring Cloud Config + Git backend
│
├── auth-service/ // SSO, RBAC, JWT. Keycloak or Spring Authorization Server
│ └── src/main/java/com/erp/auth
│
├── master-data-service/ // Company, branches, users, chart of accounts, items, UoM
│ └── src/main/java/com/erp/masterdata
│
├── finance-service/ // GL, AP, AR, journal entries, period closing
│ └── src/main/java/com/erp/finance
│
├── inventory-service/ // Warehouses, stock movements, valuation
│ └── src/main/java/com/erp/inventory
│
├── sales-service/ // Quotes, sales orders, invoices, customers
│ └── src/main/java/com/erp/sales
│
├── procurement-service/ // Purchase requests, POs, goods receipt, vendor invoices
│ └── src/main/java/com/erp/procurement
│
├── hr-service/ // Employees, payroll, attendance, leave
│ └── src/main/java/com/erp/hr
│
├── manufacturing-service/ // BOM, work orders, production planning
│ └── src/main/java/com/erp/manufacturing
│
├── reporting-service/ // Read models for dashboards, exports. Uses ClickHouse/Elasticsearch
│ └── src/main/java/com/erp/reporting
│
├── audit-service/ // Immutable audit logs for compliance
│ └── src/main/java/com/erp/audit
│
├── notification-service/ // Email, SMS, in-app alerts
│
├── shared-libraries/ // Reused across services
│ ├── common-dto/ // Request/Response DTOs
│ ├── common-events/ // Kafka event schemas
│ ├── common-security/ // JWT filters, method security
│ └── masterdata-client/ // Feign clients for master data
│
├── docker/ // docker-compose for local dev
│ └── docker-compose.yml
│
└── pom.xml // Parent POM

with AI it will take you hours or days depending on the tools token limit while if a solo developer or team take them months . codex , copilot and Claude code has the capacity when integrated to your IDE. Each projects structure or architecture is an prompt to build a enterprise web apps .

For a video CMS like YouTube/Vimeo clone, you split by ingestion, storage, processing with S3 multipart and delivery. Video is heavy on storage, async processing, and CDN .


video-cms/
│
├── frontend-web/ // React/Vue/Next.js. Video player, upload UI, admin panel
│ └── src/
│
├── api-gateway/ // Spring Cloud Gateway. Auth, rate limiting, upload proxy
│ └── src/main/java/com/vcms/gateway
│
├── bff-web/ // BFF for website. Aggregates video metadata, comments, recs
│ └── src/main/java/com/vcms/bff/web
│
├── discovery-server/ // Eureka/Consul
├── config-server/ // Centralized config
│
├── auth-service/ // Signup, login, JWT, OAuth2
│ └── src/main/java/com/vcms/auth
│
├── user-service/ // Channels, profiles, subscriptions, settings
│ └── src/main/java/com/vcms/user
│
├── video-service/ // Video metadata: title, desc, tags, visibility, status
│ └── src/main/java/com/vcms/video
│
├── upload-service/ // Handles resumable uploads to S3/MinIO. Multipart, chunked
│ └── src/main/java/com/vcms/upload
│
├── transcoding-service/ // Triggers FFmpeg jobs, generates HLS/DASH, thumbnails
│ └── src/main/java/com/vcms/transcoding
│
├── streaming-service/ // Serves HLS/DASH manifests, coordinates CDN
│ └── src/main/java/com/vcms/streaming
│
├── interaction-service/ // Likes, comments, views, watch history
│ └── src/main/java/com/vcms/interaction
│
├── recommendation-service/ // Basic recommendations. Can start with rules, scale to ML later
│ └── src/main/java/com/vcms/recommendation
│
├── search-service/ // Video search via Elasticsearch/OpenSearch
│ └── src/main/java/com/vcms/search
│
├── notification-service/ // Email, push for new uploads, comments, subs
│
├── shared-libraries/ // DTOs, events, Feign clients, security
│ ├── common-dto/
│ ├── common-events/ // VideoUploadedEvent, VideoProcessedEvent
│ └── common-security/
│
├── docker/ // docker-compose for local dev
│ └── docker-compose.yml
│
└── pom.xml // Parent POM

For a prepaid electricity card/payment platform in Nigeria, you’re integrating with DISCOs via their APIs, handling wallet/card top-ups, and dealing with NIBSS compliance. It’s heavy on payments, idempotency and audit.




power-prepaid/
│
├── frontend-web/ // React/Angular. Customer portal + admin dashboard
│ └── src/
│
├── api-gateway/ // Spring Cloud Gateway. Auth, rate limiting, IP whitelisting
│ └── src/main/java/com/powerpay/gateway
│
├── bff-web/ // BFF for customer app. Aggregates meter lookup + payment status
│ └── src/main/java/com/powerpay/bff/web
│
├── discovery-server/ // Eureka/Consul
├── config-server/ // Spring Cloud Config
│
├── auth-service/ // JWT, RBAC, KYC levels. Works with NIN/BVN verification
│ └── src/main/java/com/powerpay/auth
│
├── user-service/ // Customers, agents, merchants. KYC data, wallet balance
│ └── src/main/java/com/powerpay/user
│
├── wallet-service/ // Wallets, ledgers, funding, withdrawals. Double-entry ledger
│ └── src/main/java/com/powerpay/wallet
│
├── payment-service/ // Handles payment flows: card, bank transfer, USSD, Paystack/Flutterwave
│ └── src/main/java/com/powerpay/payment
│
├── meter-service/ // Meter lookup, validation, customer name from DISCO
│ └── src/main/java/com/powerpay/meter
│
├── vending-service/ // Core: sends token purchase to DISCO API, handles retries, token delivery
│ └── src/main/java/com/powerpay/vending
│
├── disco-adapter-service/ // Adapter pattern for each DISCO: Ikeja, AEDC, Eko, PHED, etc
│ └── src/main/java/com/powerpay/disco
│
├── reconciliation-service/ // Reconcile with DISCO, Paystack, bank statements daily
│ └── src/main/java/com/powerpay/reconciliation
│
├── notification-service/ // SMS, email, WhatsApp for token delivery, receipts
│
├── audit-service/ // Immutable audit log for CBN/CBN compliance
│
├── compliance-service/ // KYC checks, AML, transaction limits per CBN guidelines
│
├── shared-libraries/
│ ├── common-dto/
│ ├── common-events/ // PaymentSuccessEvent, TokenGeneratedEvent
│ ├── common-security/
│ └── payment-client/ // Feign clients for Paystack/Flutterwave
│
├── docker/ // docker-compose for Postgres, Redis, Kafka, services
│ └── docker-compose.yml
│
└── pom.xml // Parent POM

For telecom you’re dealing with real-time charging, high TPS, number management, and BSS/OSS separation. Structure it around subscriber lifecycle, rating, and network APIs


telecom-platform/
│
├── frontend-web/ // Customer self-care portal, admin BSS console
│ └── src/
│
├── api-gateway/ // Spring Cloud Gateway. Auth, rate limiting, API exposure for partners
│ └── src/main/java/com/telecom/gateway
│
├── bff-web/ // BFF for customer app. Aggregates balance, plans, usage
│ └── src/main/java/com/telecom/bff/web
│
├── discovery-server/ // Eureka/Consul
├── config-server/ // Spring Cloud Config
│
├── auth-service/ // OAuth2/OIDC, SIM-based auth, RBAC for admin
│ └── src/main/java/com/telecom/auth
│
├── subscriber-service/ // Subscriber profiles, SIM, MSISDN, KYC, status
│ └── src/main/java/com/telecom/subscriber
│
├── product-catalog-service/ // Plans, bundles, promos, pricing. TM Forum SID model
│ └── src/main/java/com/telecom/product
│
├── order-management-service/ // SIM activation, plan changes, porting orders
│ └── src/main/java/com/telecom/order
│
├── charging-service/ // Online Charging System OCS. Real-time balance deduction
│ └── src/main/java/com/telecom/charging
│
├── rating-service/ // Rate CDRs, calculate charges for voice/SMS/data
│ └── src/main/java/com/telecom/rating
│
├── mediation-service/ // Collects CDRs from network elements, normalizes, forwards
│ └── src/main/java/com/telecom/mediation
│
├── billing-service/ // Offline billing, invoicing, payments, dunning
│ └── src/main/java/com/telecom/billing
│
├── provisioning-service/ // Talks to HLR/HSS, PCRF, VAS platforms via SOAP/DIAMETER
│ └── src/main/java/com/telecom/provisioning
│
├── notification-service/ // SMS, USSD, push, email
│
├── analytics-service/ // Usage, churn, revenue analytics. ClickHouse/Elasticsearch
│
├── shared-libraries/
│ ├── common-dto/
│ ├── common-events/ // SubscriberActivatedEvent, UsageConsumedEvent
│ ├── common-security/
│ └── diameter-client/ // DIAMETER/REST clients for network elements
│
├── docker/ // docker-compose for local dev
│ └── docker-compose.yml
│
└── pom.xml // Parent POM

For a university portal you need more complexity around courses, credits, faculty, research, and multi-campus support. Think of it as “school portal” + SIS + LMS-lite + research mgmt.



university-portal/
│
├── frontend-web/ // React/Next.js. Student, faculty, admin, applicant portals
│ └── src/
│
├── api-gateway/ // Spring Cloud Gateway. Auth, rate limiting, CORS, routing
│ └── src/main/java/com/uni/gateway
│
├── bff-web/ // BFF per portal type: student-bff, faculty-bff, admin-bff
│ └── src/main/java/com/uni/bff
│
├── discovery-server/ // Eureka/Consul
├── config-server/ // Spring Cloud Config
│
├── auth-service/ // JWT/OIDC, SSO with Google/Microsoft/edu email, RBAC
│ └── src/main/java/com/uni/auth
│
├── identity-service/ // Students, faculty, staff, alumni profiles. Links to admissions
│ └── src/main/java/com/uni/identity
│
├── admissions-service/ // Applications, screening, offers, acceptance, deferral
│ └── src/main/java/com/uni/admissions
│
├── academic-structure-service/ // Faculties, departments, programs, courses, credits, prerequisites
│ └── src/main/java/com/uni/academic
│
├── course-registration-service/ // Course reg, add/drop, waitlists, conflict checking
│ └── src/main/java/com/uni/registration
│
├── timetable-service/ // Room allocation, class schedules, faculty availability
│ └── src/main/java/com/uni/timetable
│
├── attendance-service/ // Class attendance, biometric, QR check-in
│ └── src/main/java/com/uni/attendance
│
├── assessment-service/ // Assignments, quizzes, exams, rubrics, grading
│ └── src/main/java/com/uni/assessment
│
├── transcript-service/ // GPA/CGPA, transcripts, degree audit, graduation eligibility
│ └── src/main/java/com/uni/transcript
│
├── finance-service/ // Tuition, fees, scholarships, bursaries, payments, refunds
│ └── src/main/java/com/uni/finance
│
├── lms-service/ // Course content, materials, submissions, LTI integration
│ └── src/main/java/com/uni/lms
│
├── library-service/ // Books, e-resources, borrowing, fines
│
├── hostel-service/ // Hostel allocation, room booking, complaints
│
├── research-service/ // Projects, grants, publications, supervisor assignment
│ └── src/main/java/com/uni/research
│
├── communication-service/ // Notices, emails, SMS, push to students/faculty
│
├── reporting-service/ // Analytics, dashboards, accreditation reports. ClickHouse/Postgres
│
├── notification-service/ // Email, SMS, WhatsApp, push
│
├── shared-libraries/
│ ├── common-dto/
│ ├── common-events/ // StudentAdmittedEvent, GradePublishedEvent, FeePaidEvent
│ ├── common-security/
│ └── uni-client/ // Feign clients
│
├── docker/ // docker-compose for local dev
│ └── docker-compose.yml
│
└── pom.xml // Parent POM