Hi there, I'm Andy.
I'm a senior Ruby on Rails & AI product engineer: on Rails since 2008, working with production AI every day, and remote with US and European teams since 2011. Hire me for a senior role, or bring me in to fix your app, keep it healthy, or make it work for everyone.
Work
Senior Rails & AI Product Engineer, Adwave · 2025–2026
Adwave is a Rails product for generating video ads and managing campaigns. I worked on the workflows where AI tasks, background jobs, outside services and deterministic media generation all hand work to each other, and on agentic editing and the operations tooling behind it. I paid close attention to the parts users never see: structured state, observability, tests and browser-based QA.
Independent product engineer · since 2020
A platform for selling swimming lessons and products. I built and maintained it on Rails with Stripe: payments, instructor availability, the scheduling rules that decide what can be booked and when, and the admin and reporting behind it all.
Ruby on Rails Engineer, Spire Health · 2019–2020
Spire Health's clients work with health data from connected hardware. I built the portal where they review that data and manage how each device is configured, working across the Rails back end and the front end on charts, data handling and controls that make the data easy to understand.
Background
I started in 2005 in Beijing, writing VBScript, C# and Java for Japanese customers. In 2008 I joined Idapted, an international English-learning startup, and started building with Ruby on Rails. After it merged with Eleutian in 2010, I was promoted to senior product manager and became the technical bridge for customers in Korea and elsewhere.
In 2011 I joined Intridea and started working remotely with US teams, on more than ten client projects across Rails, Backbone, Angular and D3.js. I also wrote technical articles and presented our engineering practices.
Since 2015 I've mostly worked independently, on Rails and React apps across content, commerce, data and SaaS, with stints at Spire Health and, most recently, Adwave.
These days I build AI features into Rails apps, and I contribute fixes back to the open-source libraries I rely on, like RubyLLM and ActiveAgent.
Stack
Services
Three ways to work with me, each for a different kind of problem. You work with me directly, and we agree everything in writing before I start.
Your app has real users and needs an experienced pair of hands to keep it healthy.
Built it with Cursor, Lovable or Claude Code? I'll fix what's broken and keep it running.
Make sure everyone can finish the important tasks, including people using a keyboard or a screen reader.
Not sure which one fits? Email me a few lines about your app →
Open source
Fixes and features contributed back to the projects my own work depends on — mostly reliability: provider protocols, tool calls, attachments, structured output, caching and cost accounting, evals, and Rails integration.
Plus Langchain.rb, Rails gems and my own RubyLLM extensions. See all →
Words
Andy is very intelligent and has a strong understanding of web development principles. I've always been comfortable handing him a project and knowing that he'll be able to solve even the most difficult problems.
Andy is an experienced software engineering professional that excelled at tackling every single challenge thrown at him. I had witnessed him pick up several different codebases and be instantly productive.
A superstar with a finely honed ability to deliver well-tested, well-executed code. Consistently amazed with his ability to think creatively to solve hard problems with the resources on hand.
Any kind of bug or feature he took on was done quickly and done well. He communicated very clearly when he needed clarification. I never needed to worry that something would get done.
I'm open to senior Rails and AI product engineering roles, and I take on the three services above. I'm most useful where there are real users, real workflows and a codebase that has to keep running while it changes. I work from UTC+8 and I'm well practised at meeting US and European teams in the middle. Tell me what you're working on.