Senior Java Developer · Spring Boot · Microservices · Cloud-Native APIs
Backend engineer with 15+ years of expertise in Java and the Spring ecosystem. I specialize in building production-grade REST APIs, event-driven systems, and cloud-native microservices. Passionate about clean architecture, domain-driven design, and engineering excellence.
| Category | Technologies |
|---|---|
| Languages | Java 17/21, SQL, JavaScript |
| Frameworks | Spring Boot 3.x, Spring Security, Spring Data, Spring WebFlux |
| Data | PostgreSQL, Redis, Elasticsearch, Flyway |
| Messaging | Apache Kafka, RabbitMQ, WebSocket (STOMP) |
| DevOps | Docker, Kubernetes, GitHub Actions, Maven |
| Patterns | DDD, CQRS, Event Sourcing, Saga, Hexagonal Architecture, Multi-tenancy |
| Observability | Prometheus, Grafana, ELK Stack, OpenTelemetry |
flowchart TB
subgraph Clients
Web[Web App]
Mobile[Mobile App]
External[External Services]
end
subgraph "API Gateway Layer"
GW[API Gateway<br/>Rate Limiting • Auth • Routing]
end
subgraph "Microservices Layer"
Banking[Banking Service]
Notification[Notification Hub]
Commerce[E-Commerce Platform]
Loan[Loan Origination]
end
subgraph "Event Layer"
Kafka[Apache Kafka]
WebSocket[WebSocket Server]
end
subgraph "Data Layer"
PostgreSQL[(PostgreSQL)]
Redis[(Redis Cache)]
ES[(Elasticsearch)]
end
Web --> GW
Mobile --> GW
External --> GW
GW --> Banking
GW --> Notification
GW --> Commerce
GW --> Loan
Banking <--> Kafka
Notification <--> Kafka
Commerce <--> Kafka
Loan <--> Kafka
Notification <--> WebSocket
Banking --> PostgreSQL
Commerce --> PostgreSQL
Loan --> PostgreSQL
Notification --> Redis
Banking --> Redis
Banking --> ES
| Project | Description | Tech Highlights |
|---|---|---|
| banking-financial-api | Complete banking system with multi-currency accounts, SWIFT/SEPA transfers, fraud detection, loans, and KYC compliance | Spring Boot 3.2, JWT, PostgreSQL, Flyway, K8s |
| notification-hub-api | Multi-channel notification platform supporting email, SMS, push notifications with Redis caching and WebSocket real-time | Spring Boot, Redis, WebFlux, WebSocket/STOMP |
| api-rate-limiting-gateway | Reactive API gateway with token bucket rate limiting algorithm | Spring WebFlux, Bucket4j, Resilience4j |
| multitenant-ecommerce-api | Multi-tenant e-commerce platform with vendor isolation, product management, and shopping cart | Spring Boot, Multi-tenancy, JWT, RBAC |
| loan-origination-credit-api | Fintech loan origination system with FICO-style credit scoring engine and automated decision workflow | Spring Boot, Credit Scoring, Audit Logging |
sequenceDiagram
participant Client
participant Gateway as API Gateway
participant Auth as Auth Service
participant Banking as Banking Service
participant Fraud as Fraud Detection
participant DB as PostgreSQL
participant Kafka
Client->>Gateway: POST /api/v1/transfers
Gateway->>Auth: Validate JWT
Auth-->>Gateway: Token Valid
Gateway->>Banking: Process Transfer
Banking->>DB: Check Balance
DB-->>Banking: Balance OK
Banking->>Fraud: Analyze Transaction
Fraud-->>Banking: Risk Score: LOW
Banking->>DB: Execute Transfer
Banking->>Kafka: Publish Transfer Event
Kafka-->>Banking: Ack
Banking-->>Gateway: Transfer Complete
Gateway-->>Client: 200 OK
flowchart LR
subgraph Producers
Order[Order Service]
Payment[Payment Service]
Inventory[Inventory Service]
end
subgraph "Apache Kafka"
Topics[Event Topics]
end
subgraph Consumers
Notification2[Notification]
Analytics[Analytics]
Audit[Audit Log]
end
Order -->|OrderCreated| Topics
Payment -->|PaymentProcessed| Topics
Inventory -->|StockUpdated| Topics
Topics -->|Consume| Notification2
Topics -->|Consume| Analytics
Topics -->|Consume| Audit
flowchart TB
subgraph "Kubernetes Cluster"
subgraph "Ingress Layer"
Ingress[NGINX Ingress<br/>+ TLS]
end
subgraph "Application Namespace"
Deploy1[Banking API<br/>Replicas: 3]
Deploy2[Notification API<br/>Replicas: 2]
end
subgraph "Data Namespace"
PG[(PostgreSQL<br/>Primary + Replica)]
RD[(Redis<br/>Cluster)]
end
subgraph "Observability"
Prom[Prometheus]
Graf[Grafana]
end
end
Internet --> Ingress
Ingress --> Deploy1
Ingress --> Deploy2
Deploy1 --> PG
Deploy1 --> RD
Deploy2 --> RD
Deploy1 -.->|Metrics| Prom
Deploy2 -.->|Metrics| Prom
Prom --> Graf
"Building robust, scalable backend systems with clean architecture and enterprise best practices."