Hi, I'm Khoa. Design engineer and part-time hero.

I use AI tools to lead product teams and build cultures that make good work repeatable: clear vision, shared craft, and people set up to succeed.

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Most recently

Senior UX Designer at Ontra since February 2025, working on Ontra AI, a legal document intelligence platform.

Selected projects

Senior UX designer

Growing AI Search into a platform

AI Search served one product and answered every question the same way, leaving people waiting on a blank screen. Other teams wanted it on their own documents too.

View case study (slides)
Role
Ran customer discovery and weekly feedback and retention reporting, designed streaming answers, citations, and conversation management, proposed search-effort controls, and shipped 22 PRs, from small updates to full features.
Outcome
Weekly queries grew from about 200 to 700 and mean latency fell from 95s to 45s, with a 16s time to first token. AI Search now covers multiple document types and structured data, and reaches outside AI apps through MCP.
Principal product designer

Impossible promotions

A promotion program meant to raise engagement made it a lot worse. Why?

View case study (slides)
Role
Led strategy workshops and research, designed and prototyped solutions, managed stakeholders, and tested with users.
Outcome
Promotions that are simpler and more achievable, more of the time. The in-app experience is more transparent, and a "high intent member" model picks the best people to target.
Design lead

Designing for older adults in a three-sided marketplace

Senior living communities rely on outdated, inefficient, and costly ways to handle communication, content, and security.

View case study (slides)
Role
Set strategy and vision, researched, designed and prototyped, ensured accessibility, managed stakeholders, tested with users, and created the branding.
Outcome
An end-to-end product suite for secure, timely communication that each community can tailor, serving every stakeholder.
Graduate project

Convergence

How can design management become a core discipline in traditional business culture?

View case study (PDF)
Role
Set strategy and vision, researched, designed and prototyped, tested with users, and created the branding.
Outcome
A turnkey solution that bridges design education and business, linking school to jobs and real-world experience through service design, experience design, and branding.