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

Recently work

Projects(9)

MonkeyType Analysis

Website and extension that log and analyze typing errors. Includes a static browser extension for MonkeyType and a Next.js dashboard to import and analyze JSON data.

Heterl0's Blog

A personal blog built with 11ty.js, fast static generation, markdown-friendly, optimized for SEO and performance.

Zenaiyoga (Landing Page)

Next.js landing page for a yoga app. Optimized for performance, includes animations, and SEO-focused.

Zenaiyoga - Dashboard

Next.js dashboard for managing yoga poses, exercises, blogs, and events with CRUD and WYSIWYG editor.

Zenaiyoga - Android

Flutter app using MediaPipe to detect and correct yoga poses, with streak and reward systems.

Zenaiyoga - Back End

Django REST API for yoga app, supports JWT auth, roles, and pose analysis with Celery and Swagger UI.

Multi-Tenant Demo

Next.js multi-tenant authentication demo with cookie-passing between subdomains.

Flash Van

Simple static landing page project using HTML and CSS only.

Recruitment Platform

Mock project from internship using Angular and PrimeNG, includes job search and interview features.