Full Stack Developer specializing in AI-integrated web and mobile applications. I build and integrate software that's currently in daily production use at a real business — including an analytics app, a mobile POS, and an autonomous WhatsApp AI agent that serves live customers.
Coming from an Operations Management background (where I led a team of 7 and cut inventory discrepancies by ~30%), I approach engineering from the problem first: I've seen the bottlenecks from the inside and built the software to solve them.
- 🌍 Based in: Venezuela · Available for Remote Roles
- 🗣️ Languages: Spanish (Native) · English (B2 – Upper Intermediate)
- 🧠 Focus: AI Integration, Full-Stack SaaS, RESTful APIs, Relational Data Modeling
- 📫 Reach me at: gusreyes_dev@outlook.com · LinkedIn
Frontend & Mobile
Backend & Databases
AI, Architecture & DevOps
Software in real production use, with a focus on AI integration, secure data access, and robust architecture.
1. El Serrucho GO — Real-Time Inventory & Sales Analytics App · In production
A mobile analytics dashboard in daily use at Ferretería El Serrucho, syncing an on-premise POS to the cloud in real time.
- Tech: React Native (Expo), TypeScript, Supabase, PostgreSQL, Python.
- Highlights: Python sync engine bridging native POS
.datfiles to the cloud · RLS-secured PostgreSQL · virtualized inventory of 7k+ products · a staff queue that handles escalations from the WhatsApp AI agent.
2. WhatsApp AI Agent — "Perucho" — Autonomous Customer Service & Quoting Assistant · In production
An event-driven WhatsApp agent that serves real customers: answers inventory questions, generates exact quotes, and escalates to staff when needed.
- Tech: n8n, WAHA, GPT-4.1-mini (via OpenRouter), Groq Whisper, Supabase, PostgreSQL, Engram.
- Highlights: Read-only DB connection for safe pricing · auto-generated quotes · voice-note transcription · long-term client memory · synchronization guards and a sanitize layer to keep corrupted LLM output from ever reaching customers.
3. CaobaPOS — Mobile Point-of-Sale & Inventory System · Client project, in production
A cross-platform mobile POS actively used by a café client, built for small businesses with unstable internet.
- Tech: React Native (Expo), Supabase, PostgreSQL.
- Highlights: Offline-first inventory · real-time sync · multi-tenant access via Row Level Security (RLS) · branded PDF invoices and date-range financial dashboards.
4. Splitty — AI-Powered Expense Splitting Platform · Final Capstone, 4Geeks Academy
A full-stack FinTech app that removes the friction of group expenses through AI data extraction and optimized settlements. · Live demo
- Tech: React 18, Flask, PostgreSQL, Supabase, Google Gemini, PayPal, Vercel, Render.
- Highlights: Heap-based algorithm that reduces inter-party settlement transactions by up to 50% · Gemini-powered receipt parsing · 30+ RESTful endpoints with JWT lifecycle, bcrypt, and rate limiting · dual-cloud deploy via GitHub CI/CD.