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Senior Full Stack & Mobile Developer with 7+ years scaling production systems to 1M+ users. Expertise across backend APIs, cloud infrastructure, Expo/React Native mobile, and Next.js/NestJS web frontends with TypeScript and Prisma ORM.
Focused on AI-native product development — shipping OpenAI and Anthropic Claude integrations, production RAG pipelines, and LLM-powered features that cut inference costs by 40% and P95 latency by 55%. Daily AI-augmented development workflows with Claude (Sonnet/Opus, Claude Code), ChatGPT (GPT-4o/GPT-5), Cursor, and GitHub Copilot. Proven impact across backend, mobile, web, and AI/LLM integration — improving delivery velocity by 18%, API throughput by 20%, and infrastructure costs by 15%.
✦ Full-stack depth across web, mobile, backend, and AI — end-to-end ownership from PostgreSQL schema to LLM integration layers
✦ Production LLM development — OpenAI GPT-4o & Anthropic Claude, RAG pipelines, agent workflows, 40% cost reduction in production
✦ Mobile expertise — shipped Expo + React Native apps to App Store & Play Store with offline sync, push notifications, biometric auth
✦ Proven at scale — 1M+ user systems with distributed Redis (3x traffic), auto-scaling AWS, optimized PostgreSQL
✦ Hands-on at every layer — TypeScript, React, Node.js, PostgreSQL, AWS within the same PR
✦ AI-augmented workflow — daily Claude Code, ChatGPT, Cursor, GitHub Copilot with strong code review discipline
✦ Remote-native — 5+ years async across US, Canada, and European time zones
| 🏗️ System Architecture & Design | ⚙️ API Design & Backend Development | ☁️ Cloud Infrastructure (AWS) |
| 📱 React Native & Expo Mobile Dev. | 🍎 Cross-Platform iOS & Android Delivery | 🚀 App Store & Play Store Deployment |
| 🤖 LLM Integration & RAG Pipelines | 🧪 Prompt Engineering & Agent Workflows | 🗄️ Vector Databases & Embeddings |
| 💬 Claude / ChatGPT / Cursor | 🤝 GitHub Copilot & AI-Augmented Dev | 🌐 Full Stack SaaS Development |
| 🗄️ Database Design & Optimization | 🔁 CI/CD, Docker & DevOps | ⚡ Performance Tuning |
| 🔍 Code Review & Quality | 🔐 Security & Auth Implementation | 🧪 Testing & Integration |
Backend
AI / LLM
AI Dev Tools
Mobile
Frontend
Databases & Caching
Cloud & DevOps
🏢 Full Stack Developer — AI Agent Platform · Mascotte.AI, Remote (Europe) · Nov 2024 – Present
- Built end-to-end delivery of a B2C AI agent SaaS (Mascotte.AI v1) on Next.js 14, TypeScript, MySQL/AWS RDS — shipping 67 pages, 50+ API routes, real-time 3D avatars, voice chat, subscription billing, and a full admin panel across 12 languages
- Designed and built the architectural migration to a decoupled B2B developer platform (v2) — splitting the Next.js monolith into a React 19 + Vite 7 frontend and a standalone Express.js + Prisma 6 API, unlocking enterprise embed, SDK, and white-label use cases
- Built the real-time voice AI pipeline — LiveKit WebRTC + Deepgram STT + OpenAI GPT (via OpenRouter multi-model proxy) + ElevenLabs/Google Cloud TTS — delivering sub-second conversational avatars with per-avatar system prompts and RAG knowledge bases for context-aware responses
- Integrated Arcware Pixel Streaming, Three.js/React Three Fiber with VRM avatars, Canvas 2D editor, head tracking with calibration, and Rhubarb WASM lip-sync — combining photorealistic and stylized avatars in a unified UX
- Built the developer platform from scratch — encrypted API key management, webhook system, SDK session tracking, request logging, and embeddable widget with usage analytics — opening a new B2B revenue channel
- Shipped Stripe + PayPal subscriptions with a credit-based usage system, multi-tier plans, coupon/ambassador programs, OAuth (Google/Apple/Facebook/Discord) via NextAuth v4, AWS S3 media storage, and Pusher/Socket.IO real-time events
- Used Claude (Sonnet & Opus, Claude Code), ChatGPT, Cursor, and GitHub Copilot as daily development partners — accelerating boilerplate generation, agent-prompt iteration, integration testing, and TypeScript refactors while keeping a tight code review loop
🏢 Senior Full Stack & Mobile Developer · VulnCheck, USA (Remote) · Jan 2024 – Sep 2024
- Built a fintech SaaS platform end-to-end (NestJS, PostgreSQL/Prisma, Next.js, AWS) — scaling to 1M+ active users, reducing system-wide latency by 35%, and improving API throughput by 20%
- Shipped the core AI layer integrating OpenAI GPT-4o and Anthropic Claude APIs with streaming, function calling, and structured outputs — powering conversational financial copilots used daily by thousands of users
- Built a production RAG pipeline (pgvector, hybrid semantic/keyword search, Redis caching) tuned for financial documents — cutting LLM inference costs by 40% and P95 answer latency by 55%
- Built multi-step AI agent workflows with tool calling, retries, guardrails, and fallback strategies — deflecting 30% of support tickets without human involvement
- Shipped a cross-platform Expo + React Native mobile app (iOS & Android) with offline-first sync, biometric auth, push notifications, and an embedded AI assistant — growing mobile to 40% of total platform traffic within 6 months
- Built out AWS infrastructure (EC2 auto-scaling, ALB, CloudFront, S3, Bedrock fallback) and contributed to team development practices (PR reviews, CI gates, prompt/eval workflows) — reducing hosting costs by 15% and lifting team velocity by 18%
- Adopted Cursor and Claude (via Claude Code) for prompt iteration, RAG pipeline debugging, and integration test scaffolding — speeding up the agent-workflow development loop and reducing time to ship new tool-calling features
🏢 Senior Full Stack Developer · MERCURY DASHA, Remote · Sep 2022 – Dec 2023
- Contributed within a 3-developer cross-functional team to 100% on-time sprint delivery with Jest + React Testing Library coverage gates above 85%
- Integrated OpenAI GPT-4 and text-embedding-ada-002 into search, recommendation, and content generation flows — lifting content discovery engagement by 25% and unlocking a premium AI tier that drove 18% revenue lift
- Built and shipped an Expo + React Native mobile app serving 1M+ users — becoming a core channel contributing 35% of total revenue
- Built distributed Redis caching across expensive API endpoints, LLM responses, and PostgreSQL queries — absorbing 3x traffic growth with no additional infrastructure spend
- Built the core NestJS + TypeScript + MongoDB API layer and multi-environment AWS + Heroku infrastructure with blue-green deploys — reducing deploy failures by 90% and eliminating environment drift incidents
🏢 Full Stack & Mobile Developer · PXN Phantom Network, Remote · Mar 2019 – Jul 2022
- Delivered 30+ production features on a high-traffic global platform (Next.js, Django, PostgreSQL, AWS) with full Jest + React Testing Library coverage and zero post-release regressions
- Prototyped and shipped the company's first LLM-powered features using early OpenAI APIs (text-davinci, GPT-3.5) — content summarization, semantic tagging, and a support Q&A assistant that cut response time by 45%
- Designed and launched an Expo + React Native app for iOS and Android end-to-end — reaching 250k+ downloads and opening a new mobile-first user segment
- Contributed to a full-stack migration from a legacy PHP monolith to Next.js + TypeScript + Django REST + Prisma — improving maintainability by 40%, halving onboarding time, and enabling independent frontend/backend deployments
- Built SSR/SSG strategies in Next.js 14 that reduced TTFB by 60% and lifted conversion and revenue by 10%; built a Three.js/WebGL 3D marketing experience reaching 2M+ visitors across 12 markets
🏢 Freelance Full Stack Developer · Independent, Remote · Jun 2017 – Feb 2019
- Delivered 10+ web and mobile projects for small businesses, startups, and agency clients across e-commerce, SaaS dashboards, and marketing sites — owning scoping, estimation, build, and handoff end-to-end
- Built full-stack Node.js + Express + MongoDB and Django + PostgreSQL applications with React frontends — including payment integrations (Stripe, PayPal), email automation, and admin dashboards
- Designed REST APIs and React component libraries that clients reused across product lines — cutting their internal build time on follow-on projects by an estimated 30–40%
- Managed direct client relationships, weekly progress reporting, and structured handoff documentation — building the remote-collaboration habits that carried into every later role
🏢 Junior Web Developer · Local Web Studio, On-site · Feb 2015 – May 2017
- Started as a junior developer building responsive marketing sites and small web apps on PHP, WordPress, jQuery, and early Node.js — shipping 20+ client projects under senior code review
- Picked up JavaScript ES6, React, and Git workflows on the job — learning to work within feature branches, code reviews, and CI gates from day one
- Contributed to backend modules in Node.js + MongoDB for an internal CMS — building the database, API design, and authentication fundamentals that the rest of my career has built on
- Wrote unit tests, fixed production bugs, and learned how to ship to real users — the foundation for the senior delivery discipline I bring today
| 👥 1M+ Users Served | 🤖 40% LLM Cost Reduction | 📱 Mobile Apps Shipped |
|---|---|---|
| ☁️ 15% Infrastructure Cost Reduction | ⚡ 55% P95 Latency Improvement | 📦 30+ Production Features |
| 🎯 18% Delivery Velocity Improvement | 🔗 30% Support Ticket Deflection | 📈 250k+ Mobile Downloads |
🎓 Bachelor of Science, Computer Science — Singapore Institute of Technology
