Portrait of Hieu Le Van

Hi, I am Hieu Le Van

a Front-End Developer, specializing in optimizing web applications for performance, accessibility and creating user-friendly interfaces.

Ho Chi Minh City, Viet Nam

About me

I'm Heterl0, a Front-End Developer with Full Stack and DevOps experience. I'm currently at Moatable on Papago—a middleware agent-builder where users configure agents across providers like Gemini, OpenAI, Claude, and AWS Bedrock. I focus on clean, maintainable UI, optimizing legacy features, and delivering with best practices at speed.

Over the past 3+ years, I've built and maintained production sites and platforms with Next.js, Vite, TanStack Router, Tailwind CSS, Chakra UI, React Query, and more—from marketing pages to dashboards and multi-tenant products serving 21,000+ users.

Recent highlights include cutting redundant chat-layout re-renders by roughly 90% during typing and streaming generation, and migrating a legacy Next.js 13 Page Router codebase to Vite + TanStack Router. I've also improved Core Web Vitals, SEO, and code splitting where it matters.

I collaborate in Agile teams with code reviews and a tidy codebase.

I'm happy to connect—not just for work, but also to share experiences. Let's chat on LinkedIn!

Experience

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Recently work

Projects(9)

Tech Stack