Sk Asif User

I’m a Java Full Stack Developer with 4 years of total experience and 3.7 years building high-volume fintech payment gateway systems. I focus on secure, reliable services using Spring Boot, microservices, and event-driven architecture.

In my recent work with TerraPay Solutions (B2B Fintech Payment Gateway Platform), I designed and deployed scalable microservices and distributed systems, improving application performance by 25% while maintaining 99.9% uptime in production. I built and integrated RESTful APIs using JWT authentication and OAuth2 across merchant, acquirer, and web service portals.

I also implemented Apache Kafka pipelines for real-time transaction event streaming across Merchant, Transaction, Notification, and Reporting services. To improve responsiveness and reduce load, I applied Redis caching for frequently accessed transaction and merchant data, alongside automated testing with JUnit and Mockito to reduce bug incidents by 30%.

I bring a strong delivery mindset through Agile/Scrum collaboration and CI/CD pipelines with Jenkins, Docker, and Kubernetes, reducing deployment time by improving release reliability. I’ve built responsive React.js dashboards for high-volume transaction data and supported tools like Spring Cloud Gateway, AWS (EC2, S3, RDS), and system design practices to keep teams moving fast without sacrificing stability.