Ranjan Kumar Singh

I’m a Java Backend Developer with 3.5+ years of experience designing and developing scalable, secure, and high-performance backend applications using Java, Spring Boot, Spring Cloud, Microservices, REST APIs, Kafka, Redis, MySQL, AWS, Docker, and Kubernetes.

At Datagrid Solutions, I architected and developed microservices using Java, Spring Boot, REST APIs, and Spring Cloud. I engineered Kafka-based event-driven workflows with asynchronous communication, retry mechanisms, and Dead Letter Queue (DLQ) handling to support reliable distributed processing.

On VOSITA, a digital healthcare platform, I delivered backend features for appointment scheduling, patient management, and notifications. I implemented Redis caching and SQL optimization, improving application performance by 30% and reducing database load by 40%.

On NOVA BANK, I worked on microservices for customer accounts, transactions, fund transfers, and payments. I secured REST APIs using Spring Security, JWT, and role-based access control (RBAC), and supported containerized deployment using Docker, Kubernetes, Jenkins, and AWS.

My interests include backend architecture, microservices, distributed systems, event-driven architecture, performance optimization, cloud technologies, and solving complex production challenges. I’m currently an Immediate Joiner and looking for opportunities where I can contribute to scalable backend systems and continue growing as a Java Backend Developer.