**Full-stack engineer | AI/RAG systems | GovTech-scale delivery |
I build production software that ships to real users — from national-scale government platforms serving millions of Singaporeans, to AI-powered apps I design, build, and use myself. My background spans exercise science, 6 years running a fitness business, and 4+ years in software engineering. That cross-domain perspective shapes how I approach technical problems: from the user backward, not the stack outward.
Out of the box, Claude is capable but undisciplined — it skips requirements, guesses intent, and loses context between sessions. Agent
Harness fixes that by enforcing structured thinking, planning, and execution as non-negotiable gates before any code gets written.
Forget about prompts. Just describe what you want — Agent Harness routes your request to the right workflow automatically. Starting a
feature, debugging a bug, shipping a branch — each one triggers the correct skill without you having to think about it.
Every session starts with project context loaded. Every feature goes through brainstorm → spec → plan → implement → review. Every agent follows best practices baked into its definition — not suggested, enforced.
It ships with a library of reusable agents (architect, backend engineer, code reviewer, team lead), a workflow skill for each phase of
development, a persistent knowledge base that grows with your project, and a
RAG-based coaching app that surfaces peer-reviewed training research (Helms, Israetel, Schoenfeld) as personalised, evidence-backed recommendations. Not another generic AI wrapper — the domain knowledge is the product.
Flutter Koa/TypeScript Supabase pgvector Anthropic Claude API PostgreSQL
- Built a full RAG pipeline: chunked sports science literature → pgvector embeddings → Claude API retrieval and generation
- Grounded in Eric Helms' adherence pyramid, Mike Israetel's RP volume landmarks, and Brad Schoenfeld's hypertrophy research
End-to-end job search CRM I built to solve my own problem. Scrapes LinkedIn, Greenhouse, and Lever; scores JDs against my profile; generates tailored resumes and cover letters; auto-applies via Playwright. Currently in personal production use.
Next.js TypeScript Supabase Anthropic Claude API Playwright PDFKit Tailwind CSS
- Claude API integration: JD scoring, resume tailoring, cover letter generation — all from a single
profile.jsonsource of truth - Custom PDFKit renderer: hanging-indent bullets, inline bold parsing, zero third-party PDF libraries
- Kanban CRM with Supabase persistence, per-platform location normalisation, and staleness detection
Palo IT → GovTech Singapore (2023 – present) Built and maintained digital services used by millions of Singaporeans: LifeSG (cross-agency CMS), Baby Bonus System (30,000 babies/year), OneService App v2. Reduced development redundancy 50% via an internal Form Builder Library.
Next.js React Native Koa PostgreSQL AWS ConfigCat GitLab CI/CD
Accenture (2022 – 2023) SRE and cloud infra for enterprise systems. 95%+ uptime, AWS Lambda automation, Dynatrace/CloudWatch monitoring.
An Xing Technologies (2021 – 2022) Cross-platform Flutter apps, Stripe/Apple Pay/Google Pay integrations, mentored 4 NUS interns to full-time conversion.
Bodyengineers Pte Ltd — Founder (2015 – 2021) Built and ran a fitness business leasing personal trainers to national gym chains across Singapore. 200+ clients, press features in The New Paper and Berita Harian, invited speaker at Pepsi Company and en world Singapore. Received a 4/5 grant evaluation from an Enterprise Singapore accredited incubator for an AI personal training platform — before I knew how to code.
| Layer | Technologies |
|---|---|
| Frontend / Mobile | React, Next.js, Flutter/Dart, TypeScript, Tailwind CSS |
| Backend | Node.js, Koa, Django, Python |
| Databases | PostgreSQL, Supabase, pgvector, Firestore, MongoDB |
| Cloud / DevOps | AWS, Azure, Docker, Kubernetes, Terraform, GitHub Actions, GitLab CI/CD |
| AI / ML | Anthropic Claude API, RAG pipelines, pgvector, prompt engineering |
| Observability | CloudWatch |
- AWS Solutions Architect – Associate (2022)
- AWS Developer – Associate (2024)
- Terraform Associate (2023)
- Microsoft Certified: Azure Administrator (2023)
- GitHub Copilot Certified (2025)
- ICT Assessment (Software Developer) – GovTech Digital Academy / NUS-ISS (2025)
- Anthropic: Claude 101, Claude Code in Action, Introduction to MCP (2026)
B.Sc. Sports Science — Edinburgh Napier University Diploma in Aerospace Engineering — Singapore Polytechnic Certified Practitioner — Mac-Nutrition University
📍 Singapore | 🌍 Open to relocation: UK, Germany, Netherlands, Australia 📧 jazsleyzainal.93@gmail.com 💼 linkedin.com/in/jazz