Vijai Selvan

Background

About Vijai Selvan

I’m a Java backend developer who doesn’t just write code - I build systems that recover, adapt, and support critical business processes. My core strength lies in designing resilient APIs and solving real-world data problems where performance, traceability, and reliability matter. With over four years of experience, I specialize in developing modular services using Java, Spring Boot, and MongoDB. I’ve worked extensively in the banking and financial services domain, where system reliability, secure integration, and compliance are essential. One of my most impactful contributions was building a backend recovery API to regenerate ELZ flat files lost during a pod restart in batch processing. This solution queried MongoDB using business-date logic and restructured data into ELZ format. It restored missing records on NAS, fixing data gaps and reestablishing reporting accuracy for downstream systems in a regulated banking environment. I began my career in production support, where I gained hands-on experience debugging backend workflows, tracing API failures, and resolving data inconsistencies. That experience shaped how I write code today with resilience, operational awareness, and business continuity in mind. Over the years, I’ve worked with: » Java (8+)- OOP, Collections, Streams, and Exception handling » Spring Boot, Spring Data, and MongoTemplate for backend services » RESTful APIs for service-to-service communication » Jackson for JSON serialization and nested payload handling » Jenkins for CI/CD and deployment automation » SLF4J for structured logging and traceability » Postman and Swagger for API testing, validation, and documentation » Secure API integrations using Basic Auth, SSL, and AES encryption Beyond backend development, I independently designed and built a responsive educational platform built with HTML, CSS, JavaScript, and Bootstrap, showcasing my ability to take full ownership of frontend delivery when needed. I enjoy building systems where code meets operational reality, from recovery-ready APIs to data transformation and backend stability. I’m seeking Java backend roles where I can own core features, contribute to scalable services, and collaborate with teams to deliver production-grade systems. While backend is my focus, I’m open to full-stack opportunities that help me grow as a well-rounded developer. If you’re hiring someone who understands how software behaves in production and builds for real-world reliability, let’s connect. My Portfolio - https://vijaiselvan.github.io/portfolio/