GALAIN.DEV
Senior Software Engineer at PayPal
Building scalable systems across the stack. After hours, I run small experiments in applied AI, distributed systems, and developer tooling, then write up what I learn.
Full-Stack Developer
with 5 Years Experience
I architect and build production-grade distributed systems across the full stack. With 5 years of hands-on experience spanning fintech, healthcare, and enterprise SaaS, I've developed expertise in designing scalable microservices, optimizing system performance, and implementing robust data pipelines.
My work spans multiple business domains, from payment processing and merchant onboarding to healthcare EMR systems and HR automation. I bring a pragmatic approach to engineering: choosing the right tool for the job, writing maintainable code, and building systems that scale.
- LOCATION
- Singapore
- galaindev@gmail.com
- /in/heman-d
- AVAILABILITY
- Full-time @ PayPal
Professional Experience
Senior Software Engineer
Engineering scalable payment infrastructure using Java microservices and React. Building and extending distributed systems handling merchant onboarding, partner integrations, and checkout flows. Working across the full transaction lifecycle, from API design to data persistence and real-time event processing.
Senior Software Engineer
Lead frontend architecture decisions for healthcare EMR and EHR products, implemented RTK Query with advanced caching strategies. Designed custom MUI theming with design tokens and established Storybook for component documentation.
Software Engineer 2
Contributed to rebuild of Professional Services Automation (PSA) Enterprise SaaS product. Architected new Redux state structure, implemented virtualization for complex tables, and took part in conversion to MonoRepo.
Associate Software Engineer
Developed a complete in-house HRIS web system as sole developer. Architected the system from ground up with multiple micro-frontend interconnected sites using React.js, Material-UI, Express.js, and MySQL.
Want to Say Hello?
I’m currently focused on my full-time role, so I’m not taking on freelance work. If you want to share feedback, ask a question, or just say hi, feel free to reach out.