Rajeev Ranjan

Senior Java Backend Engineer | Technology Lead

Senior Backend / Full-Stack Engineer with 11+ years of industry experience, including 8+ years designing and building scalable backend systems and enterprise web applications in fintech and SaaS domains. Strong expertise in Java, Spring Boot, and microservices, along with hands-on Angular experience for building and integrating frontend applications. Proven ability to deliver low-latency, production-grade systems, optimize performance at scale, and collaborate effectively across frontend–backend teams

Strong expertise in Java, Spring Boot, Kafka, distributed systems, and performance optimization, with a proven ability to deliver reliable, high-impact production systems.

📍 India   |   🔗 LinkedIn   |   📘 Technical Articles

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Core Expertise

• Backend: Java (8–17), 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

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What I’m Exploring & Writing About

I’m currently documenting my deep dive into Kafka and distributed systems — 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

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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.