Fullstack Developer · React / React Native · Supabase · TypeScript

Junior developer with real production experience. I build complete products — architecture, backend, frontend, and deployment — not just UI layers.

Open to junior positions and paid internships in web or mobile development.

📫 peorrr2@gmail.com  ·  📍 Sevilla (open to remote)

Mobile & Web — React Native, Expo, React, Next.js, PWA, TypeScript
Backend — Supabase (PostgreSQL + Edge Functions/Deno + Realtime), Firebase, FastAPI, Node.js
AI & Observability — Gemini, Google ADK, OpenTelemetry, OpenInference, Phoenix/Arize, LLM-as-judge evals
Payments & Services — Stripe, FCM v1, RevenueCat, Plaid, Cloud Run, Docker
Tools — Git, Figma, Android Studio, Expo EAS, VS Code

React Native · Expo · TypeScript · Supabase · Stripe · FCM

Mobile platform for finding rooms and flatmates, currently in final testing before App Store / Google Play release. I built and own the entire stack.

• Recommendation engine with weighted scoring: 40% lifestyle · 30% budget · 20% location · 10% demographics. Separate flows for seekers and owners, with 1.4× visibility boost for premium users.
• ~45 Supabase Edge Functions in Deno with Zod validation covering auth, matching, messaging, payments, push notifications, and admin logic.
• Full Stripe integration: checkout sessions, customer portal, webhooks (subscription.updated, invoice.payment_failed), transactional rollback on DB errors.
• FCM v1 push notifications without Firebase SDK — manually signing JWTs with crypto.subtle to avoid heavy Deno dependencies.
• Real-time chat via postgres_changes subscriptions scoped per conversation.
• Rate-limited message requests: 1 lifetime request (free) / 3 per week (premium), enforced server-side.
• Shared lock on token refresh to prevent concurrent JWT burns.

Python · FastAPI · Google ADK · Gemini · OpenTelemetry · Phoenix/Arize · React

Regression-driven PDF RAG system built for an AI observability hackathon. Weak answers become regression cases, prompt candidates, and scored experiments before a human promotes changes.

• Code-owned agent runtime with Google ADK and Gemini, exposed through a FastAPI backend and React demo UI.
• OpenInference/OpenTelemetry instrumentation for Google ADK and GenAI calls, sending traces to Phoenix/Arize.
• Phoenix MCP runtime introspection so the agent can inspect operational traces and answer questions like what failed recently and what should improve next.
• In-session correction loop that detects phantom citation IDs before returning the answer, sends correction turns inside the same ADK session, and records the correction telemetry.
• LLM-as-judge evaluation pipeline for faithfulness, document relevance, and answer-quality checks, with human-controlled prompt promotion.
• Prompt experiment workflow: captured failures generate regression cases, candidate prompts are compared against production, and promotion to staging remains manual.

React Native · Expo · TypeScript · Firebase · WatermelonDB · Cloud Run

Android app for scanning receipts, managing pantry inventory, and suggesting recipes.

• AI recipe import pipeline from YouTube / Instagram / TikTok / blog URLs: Whisper (audio transcription) + LLM (ingredient and step extraction).
• Containerized AI services on Cloud Run (Ollama + Whisper) integrated with Firebase Cloud Functions.
• Offline-first architecture with WatermelonDB (reactive SQLite) and bidirectional Firestore sync.
• Freemium monetization with RevenueCat: paywall, entitlements, purchase restoration, monthly usage limits.

Next.js 14 · TypeScript · TailwindCSS · Supabase · Stripe

SaaS tool for generating color systems based on Energy & Tension dimensions using OKLCH color space.

• Interactive 2D field for exploring perceptually uniform color spaces.
• Semantic palette generation with WCAG contrast auto-fix and color blindness simulation.
• Full SaaS stack: Auth, PostgreSQL with RLS, Edge Functions, Stripe subscriptions.

JavaScript · Firebase · Node.js · IndexedDB · Service Workers

Progressive Web App for income and expense tracking with full offline support.

• Real-time sync and offline-first architecture via IndexedDB + Service Workers.
• Interactive dashboards and financial visualizations.
• Bank account integration via Plaid API.

Kotlin · Jetpack Compose

Gallery management app using multidirectional swipe gestures (delete, save, share, Zen mode).

• Zen Mode with audio, timer, and haptic feedback.
• MVVM + StateFlow, fluid animations.