About Yong Sen Yeoh
Yong Sen (Yongsen) is a full-stack developer and creative technologist based in Penang, Malaysia. Explore my background, journey, and the work I do beyond code.
Full-Stack Engineer &
Solutions Architect
Engineer helping businesses transform traditional workflows into digital, smart, and intelligent systems. Specializing in full-stack development with Next.js, React, and Node.js — with hands-on experience in AWS cloud infrastructure, DevOps pipelines, and AI/LLM integration using RAG and vector databases.
Beyond Code
Outside of work, a few things keep me curious, active, and inspired—each with its own rhythm.
Basketball
Pickup games and following the pros—fast teamwork on the court mirrors how I like to collaborate.
Fitness
Strength training and staying consistent—discipline that carries into shipping reliable software.
Music
Playlists for deep work and live gigs—rhythm and melody when I need to reset or focus.
Photography
Chasing light and composition—framing shots trains the same eye I use for UI and detail.
Travel
New cities and local food—perspective from unfamiliar streets keeps ideas fresh.
Frequently Asked Questions
- Who is Yong Sen Yeoh?
- Yong Sen Yeoh (also written Yongsen or Yong Sen) is a full-stack engineer and solutions architect based in Penang, Malaysia. He has 5+ years of experience building scalable web applications and currently works as a Technical Lead at Whatif Solutions, where he designs multi-tenant architectures and AI-powered features.
- What technologies does Yong Sen work with?
- His core stack is Next.js, React, TypeScript, and Node.js on the frontend and backend, with AWS for cloud infrastructure and Nginx, Linux, PM2, and CI/CD pipelines for deployment. He also builds AI applications using LLMs, retrieval-augmented generation (RAG), and vector databases, and creates interactive 3D web experiences with Three.js and React Three Fiber.
- Is Yong Sen available for hire or freelance work?
- Yes. He is open to full-stack engineering, solutions architecture, and creative technologist roles, as well as freelance and contract projects. The fastest way to reach him is by email at yeohyongsen@gmail.com or through the contact section of this site.
- Where is Yong Sen based, and does he work remotely?
- He is based in Penang, Malaysia, and works both on-site locally and remotely with distributed teams across time zones.
- What kind of projects has Yong Sen built?
- His work includes a multi-tenant business platform with shared data architecture and tenant isolation, DocuFill for automated document generation, the L&H Steel Engineering corporate site, WealthWise for personal finance tracking, scrcpy-gui (an open-source Windows wrapper for Android screen mirroring), and this portfolio, which includes a RAG chatbot built on vector search.
- Does Yong Sen have experience with AI and LLM applications?
- Yes. He has built AI agents for natural-language data retrieval and analysis, designed LLM tool-calling workflows, and implemented retrieval-augmented generation pipelines using embeddings and pgvector semantic search. The chatbot on this portfolio is a working example of that stack.
- What is Yong Sen’s educational background?
- He studied at Tunku Abdul Rahman University of Management and Technology (TARUMT) in Malaysia, and began his career with a software engineering internship at Finexus Group working on database migration tooling.
- How can I see Yong Sen’s resume?
- His full resume is available at yongsen.space/resume, with downloadable PDF and Markdown versions covering his work history, technical skills, and project experience.