Rajeev Ranjan
Senior Java Backend Engineer | Technology Lead
Senior Java Developer with 8+ years of experience designing and building scalable backend systems, REST APIs, and microservices for enterprise and fintech domains.
Strong expertise in Java, Spring Boot, Kafka, distributed systems, and performance optimization, with a proven ability to deliver reliable, high-impact production systems.
š India | š LinkedIn | š Technical Articles
Core Expertise
- Backend: Java (8ā17), Spring Boot, Spring Security, Hibernate/JPA
- Architecture: REST APIs, Microservices, Kafka, Caching, Clean Architecture
- Databases: PostgreSQL, MySQL, Redis
- Frontend: JavaScript, Angular
- Cloud & DevOps: AWS (EC2, S3, RDS), CI/CD, Linux
- Testing & Tools: JUnit 5, Mockito, Git, Maven, Postman
What Iām Exploring & Writing About
Iām currently documenting my deep dive into Kafka and distributed systems ā focusing on understanding real production behavior rather than surface-level tutorials.
- Kafka consumer internals and offset management
- Rebalance behavior and stateful consumer design
- Delivery guarantees and failure scenarios
- Microservice architecture patterns
- Performance and scalability in backend systems
Professional Focus
I am currently focused on mastering distributed systems at a deeper level, strengthening my DevOps knowledge.
This website serves as both my technical writing portfolio and a place where I document advanced backend concepts in a practical, production-oriented way.