Joseph Karl Crisostomo

joseph.dev.ph@gmail.com · +63 960 4431 908 · Manila, PH (UTC+8) · Portfolio Site

June 26, 2026

Dear Hiring Team,

Your post stood out because of what it asks for beyond the code: clean architecture, scalability, and long-term maintainability — products built to last, not just to ship. That’s the mindset I bring to every Ruby on Rails project, and it’s the kind of work I most want to be doing.

Most recently I built Aqualytix, a production Rails monitoring platform, solo and end-to-end. I designed the domain model, added role-based authorization and a reporting suite with server-side PDFs, and backed it with a full Rails test suite — then deployed it zero-downtime with Kamal on AWS. I delivered it as seven independently deployable slices, so the product was always demoable and never depended on a single risky release. That discipline is exactly what keeps a growing SaaS codebase honest.

The other things you mentioned are habits I’ve already built. At the Department of Science and Technology I took a backend service from zero to roughly 90% test coverage and made it safer to change, optimized slow queries through root-cause analysis, and spent most of my time improving code I hadn’t written — so working comfortably in an existing codebase is familiar ground. My recent Rails apps lean on Hotwire, but I work in React and TypeScript too and move easily between front and back end.

You mentioned this might start with a small task and grow into a long-term partnership. That suits me well — I’d rather earn the next piece of work than oversell the first. I’d be glad to take on that initial task and scope it back to you before writing any code.

Warm regards,

Joseph Karl Crisostomo