Sergio Pereyra's Work | ContraWork by Sergio Pereyra
Sergio Pereyra

Sergio Pereyra

AI Evaluator & Full-Stack Engineer | Quality & Benchmarks

    $1k+
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Followed by Kraig M, Bram D, and Nicolas P

Frankfurt, Germany

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Frankfurt, Germany

Cover image for Took Beepr from Capacitor WebView
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.
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Cover image for One thing I learned migrating
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 had grown without a clear audit trail. I led the migration to React Native with Supabase, PostgreSQL, PostGIS, and native background capabilities. I also audited 51 Supabase Edge Functions and designed a zero-downtime cutover so the product could keep serving users during the transition. The takeaway: before rebuilding a mobile app, find out which problems are architectural and which are merely visual. A prettier interface won't fix unreliable background services, weak location enforcement, or slow queries. Curious what other teams have found when moving from a WebView-based MVP to a production mobile app. 8:58
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Cover image for NextBlock - Blockchain SaaS ($250K in 2 Months)
NextBlock - Blockchain SaaS ($250K in 2 Months)
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Cover image for AI Output Evaluation & Quality Benchmarking
AI Output Evaluation & Quality Benchmarking
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