Loh Tong Hong

Loh Tong Hong

Senior Fullstack Engineer

Explore my work, projects, and skills via my interactive portfolio — http://lohtonghong.com/?token=thudh
(link expires on 12 Apr 2026)

Professional Summary

Senior Fullstack Engineer with 9+ years of experience building web applications, animation tools, payment systems, and AI-powered products. Currently at LottieFiles leading key features from payment gateway migrations to animation editors. Proven track record across multiple companies from game studios to SaaS platforms, complemented by a growing expertise in AI engineering including LLM integration, RAG systems, and vector embeddings. Passionate about shipping great products with clean, scalable code.

Work Experience

Fullstack EngineerSenior Fullstack Engineer· 4 yrs

Mar 2022 - Present

LottieFiles

  • 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
Tech stack:TypeScriptReactNext.jsReact RouterHonoViteTailwindCSSRadix UIvanilla-extractGraphQLNode.jsPostgreSQLDrizzle ORMRedisInngestStripeDockerGCPAWSPNPM monorepoTurborepoVitestPlaywright

Academy Web DeveloperFrontend JavaScript Developer· 5 yrs 9 mos

Jun 2016 - Mar 2022

Piktochart

  • Touched every corner of the infographic editor — the core of the entire product and where most of the user value lives
  • Revamped Piktostory dashboard — redesigned settings UI/UX for the video creation tool
  • Built payment system from scratch — payment interfaces and gateway integration
  • Developed font loading module — custom font family management for the design editor
  • Built rich text editor for the Piktochart infographic design canvas
  • Optimized data transfer layer — refined HTTP calls to fetch only necessary data with caching, stale data management, and request deduplication
  • Built onboarding feature — guided new users through product features with step-by-step visual walkthroughs and contextual tooltips
  • Wrote comprehensive test suites — unit tests and E2E tests across core features
  • Built internal Kudos platform — fullstack employee reward and recognition tool
Tech stack:JavaScriptVue.jsAngularJSCycleJSSvelteTypeScriptNode.jsRuby on RailsPostgreSQLWebpackSCSSSentry

Game Developer· 1 yr 1 mo

Apr 2015 - May 2016

Streamline Studios

  • Prototyped core game mechanics — R&D on gameplay features and systems for AAA game titles
  • Built AI behavior systems — foundation for game entity behaviors and NPC decision-making
  • Integrated 3D assets into game environments using Unity and Unreal Engine 4
Tech stack:JavaScriptUnityUnreal Engine 4C++SVN

Freelance & Contract Work

Fullstack Web Developer (Part Time)· 6 yrs 2 mos

2020 - Present

RSA Auto Network Sdn Bhd

  • Rebuilt OMS v2 with major platform enhancements and modernized architecture
  • Built vehicle live tracking — real-time GPS tracking similar to ride-hailing apps
  • Integrated insurance provider APIs — Allianz, Berjaya Sompo, Mazda, and more
  • Pioneered digital towing management — one of the first fully digitised onsite towing systems in Malaysia
  • Provided long-term maintenance & support — ongoing bug fixes, feature enhancements, and infrastructure upkeep
Tech stack:TypeScriptNode.jsVue.jsPostgreSQLFirebaseGCPREST APIs

Frontend JavaScript Developer (Part Time)· 8 mos

Feb 2018 - Oct 2018

IQI Global

  • Pioneered IQI Atlas — built the first iteration of what became one of Malaysia's largest property agent platforms
  • Built frontend web app from scratch — fully responsive SPA for real estate agent management
  • Defined coding standards — established conventions, methodology standards, and best practices for the team
  • Set up Webpack build system — configuration, optimization, and ongoing maintenance
  • Automated deployment workflows — deploy scripts for production and staging environments
Tech stack:JavaScriptVue.jsWebpackHTMLCSSSCSS

Fullstack Web Developer (Part Time)· 2 yrs 2 mos

2017 - Mar 2019

RSA Auto Network Sdn Bhd

  • Built OMS and OMS v2 from scratch — full onsite towing management system for roadside assistance operations
  • Implemented real-time data sync across the platform using Firebase
  • Shipped push notification system via Firebase Cloud Messaging for live operational updates
  • Architected serverless backend — scalable cloud-based architecture on GCP
  • Automated deployment pipeline — custom scripts for consistent and reliable releases
Tech stack:JavaScriptTypeScriptNode.jsVue.jsAngular 2Hapi.jsWebpackPostgreSQLFirebaseGCP

Technical Skills

Frontend:HTML5, CSS3, Motion, Canvas API, SVG, Vue.js, AngularJS, CycleJS, Svelte, TypeScript, SCSS, React, Next.js, React Router, TailwindCSS, Radix UI, vanilla-extract, Angular 2, HTML, CSS
Backend:Express, WebSockets, Node.js, Ruby on Rails, Hono, GraphQL, Inngest, Hapi.js, REST APIs
Database:Prisma, PostgreSQL, Drizzle ORM, Redis, Firebase, MongoDB
Cloud & DevOps:DigitalOcean, Cloudflare Workers, Nginx, CI/CD, GitHub Actions, Docker, GCP, AWS
AI & Machine Learning:LangChain, Mastra, Gemini AI, Claude AI, DeepSeek AI, RAG, Vector Databases, Embeddings
Tools & Build Systems:Git, PNPM, Figma, Unity, Unreal Engine 4, SVN, Webpack, Sentry, Vite, Stripe, PNPM monorepo, Turborepo, Vitest, Playwright
ide:Cursor, VSCode, TRAE, Sublime Text
Programming Languages:Python, SQL, JavaScript, C++

Education

Bachelor's Degree in Interactive Software Technology

2013 - 2015

TAR University College

  • **Deepened expertise** in system design, databases, and interactive software architecture

Diploma in Computer Science

2012 - 2013

TAR University College

Secondary Education (SPM)

2007 - 2012

SMJK Chung Ling

Primary Education

2000 - 2006

SJK(C) Perempuan China

Languages

EnglishProfessionalChinese (Mandarin)ProfessionalHokkienNativeMalayWorkingCantoneseConversational

Awards & Achievements

Penang i4.0 Seed Fund Recipient (Awarded by Chief Minister of Penang)

2022

InvestPenang

1st Place — LottieFiles Hackathon

2023

LottieFiles

2nd Place — LottieFiles Hackathon

2022

LottieFiles

2nd Runner Up — GameJam

2013

TAR University College

Chairperson, Student Welfare Committee

2012

TAR University College — Faculty of Science and Computing

Course Representative

2012 - 2015

TAR University College

Soft Skill Certification

2013

TAR University College