Mauricio Chirino — Senior iOS Engineer, Claude Mobile
Mauricio Chirino — Senior iOS Engineer, Claude Mobile
Dear Anthropic Hiring Team,
I’ve spent the last 13 years building iOS apps, and the last year building them with Claude Code open in a second window. Applying to help build the Claude mobile product isn’t a career pivot for me — it’s the most natural next step I can imagine. I get to ship the kind of app I already rely on every day.
The work you’ve described maps closely to what I actually do — at the scale you’d expect it to matter. At Bitso, whose app serves a user base of 12 million, I kickstarted the effort to modularize a legacy iOS monolith into in-repo Swift packages — work the team carried forward to cut build times from minutes to seconds (roughly 12×) and raise test coverage from 19% to 50% in a single year. Before that, at PedidosYa — an app used by millions of people every day — I rewrote critical legacy components with comprehensive test coverage. That’s the unglamorous half of “obsessive attention to detail and app experience”: the part that lets a team move fast at scale without breaking the things millions of users feel. I’ve worked the full testing pyramid from unit tests to E2E with Maestro, run CI/CD on GitHub Actions, and I’m comfortable enough across the stack to contribute to backend systems when a feature needs it rather than waiting on someone else.
On Swift, UIKit, and SwiftUI: my open-source work (MauriNet, MauriKit, NotificationsEngine, TrackingEngine) is deliberately dependency-free, and in MatchWords I blended UIKit and SwiftUI in the same app because real codebases are never greenfield. I care about doing the simple thing that holds up, not the clever thing someone has to decode at 3am.
What probably sets this application apart is that I’m not just an iOS engineer curious about AI — I’m pursuing a Master’s in Artificial Intelligence at ORT University specifically to build genuine fluency, not buzzword familiarity. I’ve integrated AI-assisted workflows into daily development and I think hard about what good human-machine interaction actually feels like on a phone. Putting frontier model capabilities into something elegant and trustworthy in a user’s pocket is exactly the problem I want to be working on.
I’ve also spent years mentoring engineers, running technical and behavioral interviews for senior and staff candidates, and writing up the why in blogs and internal docs — because shipping is a team sport and the knowledge has to outlive any one person.
I’d love to help build this. Thank you for reading.