Analytics & AI Engineer

I turn messy data into decisions people make: models judged by what they change, and AI that drafts while code checks the numbers.

Previously at Amazon Web Services McKinsey & Company CSC Generation Capgemini
Portrait of Jay Yu
Jay YuAnalytics & AI
Selected work

Things I've built.

Every project splits the job the same way. Pick a role to see who does what, or open a project for the full story.

Fraud analytics

Card-fraud scoring

A fraud model judged by the fraud it stops, not by test accuracy. Validated on months it never saw, then shipped as a planner and an analyst queue.

Live planner ↗
81%of fraud dollars stopped by blocking the card the same day, vs 69% the next day
Planner · comparing response speeds on two unseen months
  • CodeExplains each alert and replays card blocks
  • ModelRanks every purchase by fraud risk
  • PeopleAnalyst confirms; the card gets blocked
AI research

Tickmark Research

Cited answers for financial analysts. Every figure is checked against its source, and every source against who is asking.

100%route accuracy on 39 pre-registered cases, at a sixth of the LLM router’s latency
One question through plan, route, access, retrieve and verify
  • AISplits the question and writes the cited answer
  • CodeChecks access first, then verifies every figure
  • PeopleAnalyst reads an answer with every claim ticked
AI product

Quote Kitchen

AI quoting for small caterers. The assistant handles the conversation, tested code handles the price, and the owner approves every quote.

22/22held-out conversations passed, including allergies, impossible budgets and prompt injection
One order, end to end: the customer orders, the owner approves
  • AIUnderstands the request, asks, suggests dishes
  • CodePrices, fees, tax and allergen rules
  • PeopleOwner approves every quote before it goes out
More projectsEach opens a short case study
How I build

AI drafts. Code checks. People decide.

Pick a message and watch who handles it. These are real behaviours from my projects.

AIAI

{ }Code

✓People

AI

Modeling

Data

Shipping

Hover a tool to see where I've used it.

About

I like ambiguous problems with a real decision at the end of them.

My rule of thumb: let AI handle language, let code own the numbers, and let a person make the call. It's how a team ends up trusting a tool, and actually using it.

Now

  • Finishing my MS in Business Analytics at UCLA Anderson
  • Building small AI tools that check their own work

Built AI-powered planning and analytics tools for sales teams and took them from prototype to production.

Integrated LLM-driven sourcing with SQL and Python, cutting screening time 25% and surfacing 40+ acquisition targets.

Data and business analysis for client engagements.

Built CLV and churn models for high-net-worth segments and automated the pipelines behind retention strategy and revenue planning.

Machine learning, data engineering and AI, with most of the projects on this page built along the way.

Let's make something useful.

LinkedIn ↗ GitHub ↗