Cat Yung: AI Expert, Data Scientist & Fractional CTO in London (UK) and Hong Kong
Cat Yung is an AI expert, data scientist and fractional CTO for companies in London, the wider UK and Hong Kong. Cat founded Super Cat Technology, an AI agent engineering team in Hong Kong and London, and brings over a decade in production AI, NLP and machine learning, including AI voice agents and enterprise RAG running 24/7.
Expert-Vetted top 1% · Top Rated Plus · 100% Job Success Score · 21 AI agent, RAG and LLM engagements (source: Upwork profile, October 2026).
What does Cat Yung do as an AI expert in the UK and Hong Kong?
Cat Yung builds production AI for companies in the UK and Hong Kong: AI agents, voice agents, enterprise RAG and fine-tuned LLMs, built to run unattended. Clients engage Cat through Super Cat Technology, either as a fractional CTO or as embedded, time-and-materials AI engineering.
Production AI agents
Tool-calling agents and multi-agent systems (LangGraph, LangChain, AutoGen, CrewAI, MCP servers) built to run unattended. Each ships with evaluations and observability.
AI voice agents
24/7 voice agents on LiveKit and telephony — appointment booking, tool-calling, call-centre workloads in production.
Enterprise & multimodal RAG
Retrieval over compliance libraries, research and scanned documents — multimodal RAG with OCR and table parsing, GraphRAG / LightRAG on Neo4j.
LLM fine-tuning
Domain-specific fine-tuning of Llama, Qwen 2.5, Phi, Deepseek and LLaVA where a prompt is not enough.
Fractional CTO / CAIO
AI strategy, build-vs-buy calls, architecture and roadmap reviews, and governance for companies without a full-time technology or AI executive.
LLMOps & AI agent security
Evals, regression tests and observability, plus hardening an agent’s credentials and identity before it gets tool access.
“Your AI agent either runs in production at 3am or it’s a demo.”— Cat Yung, Founder, Super Cat Technology
Is Cat Yung a data scientist in the UK and Hong Kong?
Yes. Cat Yung is a data scientist with over a decade in NLP, machine learning and production AI, working with clients in London, the wider UK and Hong Kong. Through Super Cat Technology, a company can rent Cat or a vetted data scientist from the team on time-and-materials terms instead of recruiting full-time.
See how renting works on Rent a Data Scientist, how to compare candidates in the guide to the best freelance data scientist, and when a permanent hire is the better call in embedded team vs full-time hire.
What does Cat Yung do as a fractional CTO or Chief AI Officer?
As a fractional CTO or fractional Chief AI Officer, Cat Yung gives companies without a full-time technology or AI executive senior leadership, part-time. That covers AI strategy, build-vs-buy calls, architecture and roadmap reviews, and governance. Cat still ships production AI, so the roadmap comes from someone who has built what it recommends. One ML architecture and roadmap review was rated 5.0 by the client.
Read more on the fractional Chief AI Officer page, or the fractional CTO roadmap review case study.
| How Cat Yung engages | Who it suits | What Cat does | What to watch |
|---|---|---|---|
| Fractional CTO | Companies without a full-time CTO. | Architecture, build-vs-buy calls, ML roadmap reviews and technical due diligence. | Part-time by design. Not a day-to-day manager for a large engineering team. |
| Fractional Chief AI Officer | Companies that need one owner for the AI agenda. | AI strategy, vendor decisions, governance and risk, and board reporting. | A strategy only pays off once someone builds it. |
| Embedded AI engineering (time and materials) | Teams that need production AI shipped. | Builds AI agents, RAG and voice agents inside your team. | Keep the work documented in your own repositories. |
| Rent a data scientist | Teams with a data science or ML backlog. | NLP, machine learning and analytics, embedded in your team. | Not a substitute for a permanent core-team role. |
What has Cat Yung shipped in production?
Cat Yung’s production work includes a 24/7 AI voice agent call centre live at a 5,000-employee US enterprise, an enterprise RAG chatbot over compliance documents inside a Big 4 accounting firm, and a fine-tuned LLM with retrieval for a family office. Each case is written up on the Super Cat Technology portfolio.
- 24/7 AI agent call centre, live in production at a 5,000-employee US enterprise. →
- Enterprise RAG chatbot for a Big 4 accounting firm, fully on-premise. →
- Super Chain: private on-premise AI for a family office. →
- N8N2MCP: an open-source n8n-to-MCP server, MIT licensed. →
- Fractional CTO: ML architecture and roadmap review, rated 5.0. →
“Very highly recommend working with Cat. The quality of work, going the extra mile and idea or assistance given were truly outstanding.”— ML Advisor & CTO Roadmap client, 2025
How can you verify Cat Yung’s credentials?
Check them with the issuer rather than taking them on trust. Upwork awards the Expert-Vetted badge (top 1% platform-wide), Top Rated Plus status and a 100% Job Success Score, across 21 engagements and 1,152+ hours (source: Upwork profile, October 2026). Cat’s professional history is on LinkedIn, and the named production work is on the portfolio.
Who does Cat Yung work with, and who is it not for?
Cat Yung works with enterprise teams building AI voice and agent systems for customer service, sales and internal operations. Clients include financial services firms, family offices, Web3, supply-chain and regulated organisations, and funded startups moving an MVP to production. It is not the right fit for buyers choosing on lowest bid, or for teams who want a demo rather than a system in production.
What are the limits of a fractional CTO?
A fractional CTO is part-time by design. Cat Yung can set direction, review architecture and unblock decisions, but is not a day-to-day manager for a large engineering organisation. A company that needs one should hire a full-time CTO. Time-and-materials work also needs documenting in your own repositories, so the knowledge stays when the engagement ends.
Work With Cat Directly
Also building Super Chain, private on-premise AI for family and investment offices.
About Cat Yung
Who is Cat Yung?
Cat Yung is an AI expert, data scientist and fractional CTO based in London and Hong Kong, and the founder of Super Cat Technology. Cat also operates Super Chain, private AI for family offices. Upwork rates Cat Expert-Vetted, top 1% platform-wide, after over a decade in production AI, NLP and machine learning.
Who is an AI expert in the UK and Hong Kong?
Cat Yung is an AI expert serving clients from London and Hong Kong through Super Cat Technology. The work is production AI rather than slideware: a 24/7 AI voice agent call centre at a 5,000-employee US enterprise, enterprise RAG inside a Big 4 accounting firm, and fine-tuned LLMs with retrieval for a family office.
What does a fractional CTO in London or Hong Kong do?
A fractional CTO gives a company without a full-time CTO senior technical leadership part-time: what to build, buy or avoid, architecture calls, AI and ML roadmap reviews, and technical due diligence. Cat Yung works as a fractional CTO for clients in London, the wider UK and Hong Kong, closing the gap between a prototype and a production system.
How do I hire a data scientist in the UK or Hong Kong?
Either recruit full-time or rent one. Super Cat Technology embeds vetted data scientists in your team on time-and-materials terms from Hong Kong and London, led by Cat Yung. Whichever route you take, check signals a third party verifies, such as an Expert-Vetted badge, a Job Success Score and production systems, not self-graded percentiles.
Does Cat Yung work with clients outside London and Hong Kong?
Yes. Super Cat Technology has a team in Hong Kong and London and serves clients in Hong Kong, the United Kingdom and worldwide, embedding remotely into enterprise teams. Its production work includes a 24/7 voice agent for a US enterprise with 5,000 employees, so the client does not need to be in either city.
How do I work with Cat Yung?
Book a call through super-cat.tech. Engagements run as fractional CTO or Chief AI Officer retainers, or as embedded, time-and-materials AI engineering with the Super Cat Technology team. Cat Yung leads the work in either model, from Hong Kong or London, and the case studies on the portfolio show what each has delivered.