Sergio Pereyra
AI Evaluator & Full-Stack Engineer | Quality & Benchmarks
Took Beepr from Capacitor WebView prototype to production React Native + Expo Bare.
Audited 51 Supabase Edge Functions, rebuilt background geolocation for native, added PostGIS.
Zero downtime. 100% background geolocation reliability.
If your app outgrew its prototype, DM me.
Something I keep relearning after 20 years of delivery work: the clients who close fastest are the ones who were already reading me before they reached out.
Not cold leads. People who saw how I handled a broken launch or a production fire, sat with it for a while, and messaged...
One thing I learned migrating a mobile product from a WebView MVP to React Native: the hardest problems usually aren't the screens.
On Beepr, the real blockers were background execution, geolocation reliability, push notifications, slow geospatial queries, and backend logic that...
Is your SaaS, AI, web, or mobile product delayed, unstable, or difficult to coordinate?
Start with a paid Rescue Assessment. I’ll identify the main delivery bottleneck, major risks, recommended next steps, and a realistic delivery plan and estimate.
It’s designed for founders...
I've been on Upwork since it was called oDesk. That was 2010. 475+ projects, 100% Job Success, Top Rated Plus.
This month I set up shop on Contra too.
Not a rage-quit. Upwork built my career. Some of my best client relationships started there, including a founder whose API...
