CV — Freddy Méndez

PerfilProfile

Ingeniero móvil senior independiente. Construyo apps React Native + Supabase de cero a producción para founders no-técnicos. Especializado en la parte que la mayoría evita: submission real a Google Play / App Store, push notifications que funcionan, pagos que pasan la review, y los mil detalles operativos que deciden si una app se lanza o muere en QA. Trabajo a precio cerrado, fecha cerrada, app en producción al terminar el contrato. Independent senior mobile engineer. I build React Native + Supabase apps zero-to-production for non-technical founders. Specialized in the part most freelancers skip: real store submission to Google Play / App Store, push notifications that don't break, payments that pass review, and the dozen operational details that decide if an app launches or dies in QA. I work fixed-price, fixed-timeline, app in production at end of contract.

Sobre AppcreativAbout Appcreativ

Appcreativ es operado por dos contractors independientes: Appcreativ is operated by two independent contractors:

Freddy Méndez — Senior Mobile Engineer. Lead de ingeniería y delivery cliente-facing. El ingeniero que trabaja en tu proyecto. Senior Mobile Engineer. Engineering lead and client-facing delivery. The engineer you'll work with on your project.
Joseph Barquero — Operaciones US (Dallas, TX). Maneja facturación, contratos y compliance fiscal para engagements con clientes en Estados Unidos. US Operations (Dallas, TX). Handles billing, contracts, and tax compliance for engagements with US-based clients.

Ambos operamos bajo la marca Appcreativ como contractors independientes — cada uno declara impuestos en su jurisdicción. We both operate under the Appcreativ trade name as independent contractors — each files taxes in own jurisdiction.

Proyectos & experienciaProjects & experience

SportTrack

2026 — present

Tracker de fútbol en tiempo real · 5 mercados · En Closed Testing en Google Play Real-time football tracker · 5 markets · In Closed Testing on Google Play

App publicada en Closed Testing con 12 testers verificados, 14 días de uptime
Arquitectura híbrida (API-Football + TheSportsDB) que redujo llamadas API ~60%
20+ Edge Functions con crons programados en Supabase
40+ tablas con RLS para 3 roles (basic/premium/admin)
i18n nativo en 5 idiomas (ES/EN/DE/FR/IT)
Push notifications: goles, alineaciones, inicio de partido con <90s de latencia
AdMob (banner + native + rewarded) + Play Billing integrado

App live in Closed Testing with 12 verified testers, 14-day uptime
Hybrid API architecture (API-Football + TheSportsDB) reducing API calls ~60%
20+ scheduled Edge Functions on Supabase
40+ tables with RLS for 3 roles (basic/premium/admin)
Native i18n in 5 languages (ES/EN/DE/FR/IT)
Push notifications: goals, lineups, match start with <90s latency
AdMob (banner + native + rewarded) + Play Billing wired

React NativeExpoSupabasePostgreSQL Edge FunctionsGeminiResendAdMobi18next

VersoIA

2026

App de extracción de letras y acordes desde fotos · Gemini AI Lyric & chord extraction from photos · Gemini AI

Pipeline completo: cámara → Gemini 1.5 Flash → editor rich-text → exportación PDF nativa
NativeWind v4 para styling, Expo SDK 54, TypeScript
RichEditor con overlay de acordes sobre líneas de letra

End-to-end pipeline: camera → Gemini 1.5 Flash → rich-text editor → native PDF export
NativeWind v4 for styling, Expo SDK 54, TypeScript
RichEditor with chord overlay over lyric lines

React NativeExpoGemini AINativeWindexpo-print

GastosApp

2026

App de gastos y millaje, lista para APK de producción · Rescate de template Expense + mileage tracker, production-ready APK · Template rescue

Migración de backend self-hosted a Supabase Cloud sin downtime
Auth gate + políticas RLS en 4 tablas con auth.uid()
Caché offline (AsyncStorage) con optimistic updates
Extracción de facturas vía Gemini Vision Edge Function
Build de APK release en Windows (workaround Ninja path-length bug)

Self-hosted to Supabase Cloud backend migration, no downtime
Auth gate + RLS policies on 4 tables with auth.uid()
Offline cache (AsyncStorage) with optimistic updates
Invoice extraction via Gemini Vision Edge Function
Release APK build on Windows (Ninja path-length bug workaround)

React NativeExpoSupabaseGemini VisionAsyncStorage

Skills & stackSkills & stack

MobileMobile

React NativeExpo (SDK 52–54)TypeScriptExpo Router react-native-iap / expo-in-app-purchasesexpo-notifications (FCM) expo-printAsyncStoragei18nextNativeWind React QueryZustand

Backend & infra

Supabase (Auth, DB, Storage)PostgreSQLRow-Level Security Edge Functions (Deno)pg_cronnet.http_post Cloudflare PagesCloudflare WorkersCloudflare Email Routing Resend (SMTP + API)

AI integration

Gemini API (Flash / Vision)Claude APIOpenAI API Prompt engineering for product featuresBatch & token budgeting

Release & ops

Google Play ConsoleApp Store ConnectTestFlight Internal / Closed / Open Testing tracksPlay Billing AdMob (banner / native / rewarded)Content Rating · Data Safety forms Keystore management (AAB signing)EAS Build

IdiomasLanguages

Español — nativo (calls + escrito)Spanish — native (calls + written) Inglés — solo async (email + Loom)English — async only (email + Loom)

ContactoContact

Para discovery call (15 min, sin pitch de venta): cal.com/freddymendez85/discovery. Para email directo: hire@appcreativ.app. Respondo en menos de 24h en horario Dallas (CT). For a discovery call (15 min, no sales pitch): cal.com/freddymendez85/discovery. For direct email: hire@appcreativ.app. I reply within 24h Dallas business hours (CT).