I'm Andy Wang, a senior Rails & AI Product Engineer normally lived in UTC+8 timezone.
Building web software since 2005, primarily Ruby on Rails since 2008, working remotely with US and European teams since 2011.
My work is the product system around model capabilities β multi-stage workflows, application state, retries, human review, evaluation and observability β rather than one-off prompts or demos.
- Rails product systems β greenfield builds and mature codebases I own over the long term
- Complex business workflows β payments and subscriptions, lesson/resource scheduling, marketplaces, CMS and multi-channel publishing, data and reporting, admin and operational tooling
- Multi-party platforms β roles, documents, agreements and state machines, including private-investment onboarding workflows, health-device data portals and vendor marketplaces
- Production AI workflows β structured inputs and outputs, asynchronous state, retries and failure recovery, human review, evaluation, cost control and observability
- Legacy modernization β Rails upgrades, test suites, background processing and third-party integrations
I'm most useful where a product has real users, non-trivial workflows, and a codebase that has to keep working while it changes. Happy to talk about senior AI product engineering, Rails systems, production AI workflow integration, and end-to-end product delivery.