Hey there, I'm
Loh Tong Hong 👋
A passionate full-stack engineer with 9+ years of shipping web applications from the ground up. Currently building the future of motion design at LottieFiles, with a growing focus on AI-powered experiences.
33 y/o from Penang, Malaysia with experience working for
9+
Years
4+
Companies
70+
Projects
∞
Learning
∞
Passion
What I Do
Comprehensive digital solutions from web app development to AI engineering
Full-Stack Development
React, Remix, Node.js — building pixel-perfect UIs backed by robust APIs and scalable backends.
AI Engineering
RAG systems, AI agents, embeddings, LLM integrations — turning ideas into intelligent applications.
Tech Exploration
Animation, Canvas, SVG, Framer Motion — making interfaces feel alive and delightful to use.
DevOps & Cloud
Docker, GCP, Cloudflare, CI/CD — shipping to production with confidence and reliability.
Automation & Tooling
Workflow engines, internal tools, build systems — streamlining processes so teams move faster.
Data & Integration
PostgreSQL, MongoDB, REST/GraphQL APIs, third-party integrations — connecting systems end to end.
Career Journey
From education foundations to professional experience — a timeline of growth and craft
Mar 2022 - Present (4 yrs)
Another leap — this time from frontend into fullstack development. Joined LottieFiles to build the future of animation on the web, tackling everything from payment systems to workflow engines to the animation editor itself. Took on senior-level responsibilities since 2023, earned the promotion in late 2024, and officially became Senior Fullstack Engineer in early 2025 — still thriving with footprints everywhere throughout the product. And yes, he built nearly half of the features and UI you see on app.lottiefiles.com and lottiefiles.com.
Key contributions
- Built the LottieFiles homepage and marketplace homepage from the ground up
- Led Stripe payment migration — billing UI, entitlement system, and local Docker setup
- Upgraded framework from Next.js 12→14, React 17→18, and Tailwind 2→3 across multiple apps
- Architected unified workspace — consolidated workspace types, auth flows, and join policies
- Built premium animation marketplace with A/B testing, pack search, and multi-asset support
- Built nested folder system and rebuilt the file location picker with tree navigation
- Shipped multi-animation .lottie support end-to-end — carousel UI, upload flow, and backend pipeline
- Built advanced animation optimizer with customizable quality settings on relottie v2 pipeline
- Led complete sidebar redesign with onboarding modules and vanilla-extract adoption
- Shipped enterprise audit logging with CSV export and workspace-level event tracking
- Built AI reverse image search — vectorized images and text into embeddings via AI, enabling similarity-based animation discovery across the platform
- Championed AI-augmented development — authored team-wide AI coding skills, configured MCP servers, and wrote Cursor rules to maximize developer efficiency and code quality
High impact product shipped
Advanced Lottie Optimization
- Customizable precision, quality & compression controls
- Powered by relottie v2 pipeline with premium upgrade gating
Premium Animation Marketplace
- 300K+ premium animations with pack browsing & search
- Multi-iteration rollout with A/B testing and feature flags
Team Collaboration & Workspaces
- Unified workspace system with roles, permissions & join policies
- Sidebar redesign, onboarding modules & nested folder navigation
Export & File Optimization
- Unified download & embed panel for GIF, MP4, dotLottie formats
- File size reduction up to 80% with dotLottie compression
Enterprise Features
- Audit logs with CSV export & workspace event tracking
- Unified admin & billing with Stripe-powered payments
AI-Powered Search & Dev Tooling
- Reverse image search using AI-generated vector embeddings for similarity matching
- Defined AI coding skills, MCP configs & Cursor rules to boost team-wide dev efficiency
Tech stack
Product involved
- Lottie Creator— Web-based animation creator
- LottieFiles website— Animation marketplace
- Workflow— Automation tool
Tech Stack
Technologies and tools I work with daily
Frontend
Backend
Database
Cloud & DevOps
AI / ML
Tools
IDE
Languages
Skills & Achievements
Communication skills and recognitions earned along the journey
Penang i4.0 Seed Fund Recipient (Awarded by Chief Minister of Penang)
InvestPenang · 2022
Booktoday Sdn Bhd (Booklah online booking platform) awarded grant by the Chief Minister of Penang via InvestPenang's Penang i4.0 Seed Fund.
Languages
Communication is key
Motto
Words I live by
“Actions over words”
Don't be the loudest person in the room, but be the one who actually gets it done.
“What doesn't kill you makes you stronger”
Every tough moment taught me something I couldn't have learned any other way and I'm grateful for what they turned me into.
“Treat others like how you want to be treated”
Everything is a two-way street. It might be someone else going through it today, but it could easily be me tomorrow.
Awards & Achievements
Recognition along the way
1st Place — LottieFiles Hackathon
LottieFiles · 2023
Won first place at the company-wide internal hackathon.
2nd Place — LottieFiles Hackathon
LottieFiles · 2022
Runner-up at the company-wide internal hackathon.
2nd Runner Up — GameJam
TAR University College · 2013
Created a platformer game with stages and modes using C# and XNA within 12 hours.
Chairperson, Student Welfare Committee
TAR University College — Faculty of Science and Computing · 2012
Bridged communication between students and college administration. Represented FACS students college-wide.
Course Representative
TAR University College · 2012 - 2015
Course representative for Interactive Software Technology for 3 consecutive years.
Soft Skill Certification
TAR University College · 2013
Achieved competencies in communication, critical thinking, teamwork, leadership, and ethics.
Beyond Code
What I'm into when I'm not pushing commits
AI Tinkering
Building AI agents, experimenting with LLMs, and exploring what's possible with embeddings and RAG systems.
Always Learning
Constantly picking up new frameworks, patterns, and engineering approaches. The tech world never sleeps.
Exploring the World
Based in Penang, Malaysia — love discovering hidden food gems and cultural spots around the world.
Music & Focus
Coding sessions powered by lo-fi beats, progressive rock, and the occasional jazz playlist.
Gaming
From strategy games to RPGs — a lifelong gamer who appreciates great game design and interactive storytelling.
Badminton 4 Life
Smashing shuttlecocks on the court is my favourite way to unwind — competitive spirit on and off the keyboard.
Meet Odelia
Psttt... I'll tell you everything you want to know about Tong Hong, but promise me you won't tell anyone, especially Tong Hong!
Odelia
Tong Hong's AI agent