Curriculum Vitae
Tsang Wai Lam, William
Senior Full-Stack & AI Engineer · London, United Kingdom
Senior Full-Stack & AI Engineer with 10+ years of experience in software engineering and deep expertise in building production-grade LLM applications, RAG pipelines, and agentic systems. Proven track record of architecting scalable, distributed systems, creating robust backend services, and building interactive, high-performance frontends. Highly skilled in bridging complex AI infrastructure (AWS, LangChain) with modern full-stack application layers (Python, TypeScript, Golang) to bring intelligent products from concept to secure production deployment.
My story
I started my career as a web developer, building online teaching materials at City University of Hong Kong and freelancing on websites and multimedia applications. When the freelance work outgrew evenings and weekends, I co-founded a software house — Digicrafts — with a partner, building multimedia sites and applications for universities, government institutes and international companies. When the iPhone and the App Store arrived, I taught myself mobile development and helped clients ship games and apps.
From there I moved into large-scale backend engineering — real-time game systems, distributed platforms holding 10k+ concurrent users — and led a backend team in Hong Kong before relocating to London in 2023. Today I build production LLM systems: agentic platforms, RAG pipelines, and the AI assistant on this site.
Experience
MAY 2025 — JULY 2026 · LONDON, UK
Senior AI / Full Stack Engineer
- Building an agentic AI orchestration platform with LangChain, LangGraph and CrewAI
- Designed and optimised RAG pipelines over Pinecone, PostgreSQL (pgvector) and Neo4j
- Implemented prompt engineering strategies to improve agent reasoning and outputs
- Evaluated and debugged LLM workflows using LangSmith
- Deployed scalable AI systems on AWS EKS with Bedrock integration
- Built APIs and full-stack features (Python, TypeScript/Node.js) for AI applications
- Drove CI/CD automation with GitLab and ArgoCD
- Mentored junior engineers through code reviews and technical guidance
- End-to-end ownership for an full stack AI orchestration platform (retrieval pipelines, agentic workflow, LLM chatbots, MCP server) using FastAPI, LangChain/LangGraph, and React for multi-agent system
- Designed extraction and RAG pipelines using VLM, Pinecone, PGVector, and Neo4j
- Improved LLM workflow quality through prompt engineering and evaluation system
- Deployed scalable AI services on AWS EKS with Bedrock and EKS
Mia Platform
Agentic AI orchestration platform deploying specialised agent workflows for large-volume document analysis.
MAY 2023 — MAY 2025 · UK
Freelance Software Engineer/ Consultancy
StarRise Entertainment Ltd.
- AI-powered customer service chatbot: designed and built a customer-facing conversational AI on LLMs with RAG — personalised support, automated question answering and self-service
- Casino gaming platform modernisation: led the transformation of a legacy monolith into a scalable, cloud-ready architecture
- Designed microservices-based systems, reducing downtime by 40%
- Migrated legacy systems to Go/Node.js, improving performance by 50%
- Built CI/CD pipelines (Docker, Kubernetes), enabling reliable AI deployments
- Developed an full stack LLM-powered chatbot with RAG, improving user engagement
- Modernised legacy systems into microservices with Go/Node.js, reducing downtime by 40% and improving backend performance by 50%
- Implemented Docker/Kubernetes CI/CD pipelines to support reliable deployment of cloud and AI-enabled services
JANUARY 2020 — JANUARY 2023 · HONG KONG
Team Lead / Senior Software Engineer
- Led a team of 3+ engineers, delivering projects on time and improving team efficiency
- Conducted code review and facilitated team knowledge sharing
- Established testing strategies to improve system reliability and stability
- Designed backend systems supporting 10k+ concurrent users
- Implemented CI/CD workflows with Helm, Docker and Kubernetes
- Led a team of engineers delivering scalable backend services and establishing stronger testing, code review, and engineering practices
- Architected and developed a full-stack casino platform using Go (Golang), Node.js, Typescript and React.js
- Designed systems supporting 10k+ concurrent users and implemented CI/CD workflows with Helm, Docker, and Kubernetes
Online Casino Platform
Architected and implemented the backend for game logic, studio management, and admin portal. Optimized system to support 10k+ concurrent players, ensuring seamless performance.
AUGUST 2019 — JANUARY 2020 · HONG KONG
Senior Analyst Programmer
- Delivered a working prototype within 2 weeks, accelerating stakeholder approval
- Developed core backend services in Go, reducing API response time by 50%
- Created TypeScript client libraries for seamless frontend–backend integration
- Implemented unit and integration testing frameworks
- Delivered a functional prototype within 2 weeks and built core backend services in Go, reducing API response time by 50%
- Developed React mock frontend, testing frameworks, and TypeScript client libraries to accelerate delivery and integration
2004 — 2022 · HONG KONG
Co-Founder / Software Developer / Project Manager
- Co-founded a software house delivering web, multimedia and mobile solutions for universities, government institutes and international companies
- Started as project manager and team lead (2004 — 2010): websites, multimedia games and print design; later led mobile game/app development (2011 — 2022)
- Adopted cross-platform technology — React / React Native, Flutter and Unity — to boost delivery productivity
- Managed the full product lifecycle from concept to deployment, including a mobile product reaching 5M+ users
2003 — 2004 · HONG KONG
Freelance Web / Multimedia Developer
Freelance
- Website design and development plus multimedia animation in Flash and 3D for university and government clients
2000 — 2003 · HONG KONG
E-Learning Material Developer
City University of Hong Kong
- Developed online teaching programmes and multimedia learning materials for students
- Built and maintained the supporting websites