Nguyen O.

Senior Full Stack Developer | Next.js, NestJS, AWS | SaaS, MVP & AI

Senior Full Stack Developer, 10+ years, now Head of Engineering for a HIPAA telehealth platform serving 100,000+ patients. I build SaaS products and MVPs end to end with Next.js, NestJS, PostgreSQL and AWS. 7,700+ hours, $300K+ earned, 100% Job Success. I also ship AI features that survive real users, not just demos: LLM agents, voice AI, and AI image and video pipelines. 48 jobs, Top Rated Plus, AWS Certified (Developer + Solutions Architect). Most clients call me Nelson. WHAT I GET BROUGHT IN FOR 1. SaaS and MVP builds: idea to production, one person owning frontend, backend, database and deployment. 2. Backend systems: NestJS and Node.js APIs, auth and permissions, background jobs, queues, webhooks, third-party integrations. 3. AI product work: LLM features, agents, AI image and video pipelines, voice AI, shipped inside real products with real users. 4. Rescue work: slow queries, breaking deploys, unreliable jobs, and codebases that need to ship again. WORK THAT SHOWS THE LEVEL (all three are Upwork contracts, 5 stars; full case studies in my portfolio below) 1. SceneWeaver: Founding Engineer, empty repo to closed beta used by filmmakers and educators in 30+ countries. Built the script-to-storyboard-to-video AI workflow, async media pipelines, and the AWS infrastructure. $60K+ over 1,556 hours. 2. Novi: HIPAA telehealth for GLP-1 care, now supporting 100,000+ patients. Built it with Next.js and NestJS, PHI handling on AWS, Stripe subscriptions, and integrations with three provider networks. The client brought me back as Head of Engineering, where I am today. 3. Press Play: national dance convention platform running across 20+ cities in the US and Canada. Next.js, Node.js, Prisma, Stripe, AWS. 972 hours, $48,600, completed February 2026. HOW I WORK I ask what the highest-risk piece is before I write any code, and I tell you when something should be cut for v1. You get code your next developer can read, short written updates, and no surprise rewrite six months later. Based in Ho Chi Minh City (ICT). I keep hours that overlap the US working day and I reply the same day, every day. STACK Next.js 15, React 19, TypeScript, Tailwind CSS, shadcn/ui NestJS, Node.js, Express, Python, FastAPI, Django PostgreSQL, Prisma, Drizzle, Redis, BullMQ AWS (Certified), Vercel, Supabase, Neon, Docker, GitHub Actions Stripe, Paddle, Supabase Auth, Firebase Auth OpenAI, LangChain, LangGraph, Vercel AI SDK, Replicate, ElevenLabs CERTIFICATIONS AWS Certified Solutions Architect - Associate AWS Certified Developer - Associate Upwork Skill Certification - React Front-End Development If you are starting a SaaS build, restarting a stalled one, or your backend is the thing holding the product back, send me the details and I will tell you what I would build first and what I would cut. A short chat is the fastest way to start.