Open to opportunities

kelvin punch

@kelvinpunch

Message

Full-Stack Developer specializing in Java Spring Boot and React for fintech and education.

Indonesia

Message

What I'm looking for

I seek full-stack or backend roles where I can build scalable, secure systems, improve performance, and contribute to cross-functional teams in fintech or edtech.

I am a Full-Stack Developer with hands-on experience building production-grade web and mobile features using Java Spring Boot, React, and MySQL, focused on fintech and education domains. I have implemented secure authentication flows (JWT, refresh tokens), caching strategies, and performance optimizations that reduced API latency and improved reliability.

I collaborate effectively across teams, contribute to CI/CD and DevOps tasks, and maintain high-quality code through testing and standardized practices. My work includes designing microservices, database schema and migrations, frontend internationalization and state management, and deploying full-stack solutions for SaaS platforms.

Experience

Work history, roles, and key accomplishments

Fullstack Developer

PT Novatots Edual Indonesia

Mar 2025 - Aug 2025 (5 months)

Built and maintained full-stack features for a school SaaS platform across web and mobile, implemented JWT authentication with secure refresh token flows, and reduced API latency via Caffeine caching and database indexing.

React MySQL JWT React Query Zustand REST APIs

Software Developer

Maybank

Feb 2023 - Nov 2024 (1 year 9 months)

Developed and maintained Java Spring Boot microservices for financial systems, optimized SQL queries and implemented caching and Flyway migrations to improve reliability and integration.

Spring Boot MS SQL Server Flyway HMAC Bash Scripting Microservices Junit CI CD

Software Developer

Sonicboom Solutions Sdn. Bhd.

Sep 2021 - Jan 2022 (4 months)

Built responsive web and mobile prototypes including a food-ordering Android app and Flutter profile app, implemented JWT-protected Web APIs and documented OS hardening and reporting using SSRS.