Software Engineer | AI, Machine Learning & Full-Stack | Looking for remote/hybrid roles

Building production-grade intelligent systems — from local LLM pipelines (RAG) to end-to-end web & mobile applications.

OTP authentication service with SMS and voice delivery, rate limiting, and full CI/CD.

• Stack: Python · FastAPI · Redis · Twilio · Docker · GitHub Actions
• Sliding window rate limiting with Redis sorted sets (3 req/5min per phone)
• HMAC-SHA256 OTP hashing with time-safe comparison
• Dual channel delivery: SMS + voice calls with text-to-speech
• Full test suite: unit + integration tests with fakeredis and pytest
• CI/CD pipeline: lint → typecheck → test → build → push to container registry

An LLM-powered chatbot for SIGP, an agricultural management platform. Full ownership from architecture to deployment.

• Stack: Python · FastAPI · LangChain · LangGraph · ChromaDB · Ollama · PostgreSQL
• Built a production RAG + SQL Agent chatbot using a deterministic pipeline with ReAct agent fallback, BM25+MMR hybrid retrieval, dynamic few-shot prompting, and schema pruning over 3 PostgreSQL databases
• Improved SQL accuracy from 13% → 77% on a 30-question domain golden set (LLM-as-Judge) using a 7B local model, outperforming a 14B reference model at 10–30× lower latency
• Achieved 5.2s median response time with no external API dependencies; system maintains stable performance under sustained 5-user concurrent load
• Designed and deployed PostgreSQL materialized views eliminating query timeouts on aggregation-heavy analytical questions

Intelligent parking management with computer vision and IoT hardware integration.

• Stack: Python · PyTorch · FastAPI · PostgreSQL · React · React Native · ESP32
• CV: Custom-trained CNN (ResNet) for real-time spot occupancy detection
• ALPR: Fast-ALPR for automatic license plate recognition at entry/exit gates
• IoT: ESP32 cameras integrated for gate automation, WebSocket real-time updates

AI-powered mock interview platform for companies, combining voice synthesis with dynamic conversational logic.

• Stack: TypeScript · Node.js · React · Supabase
• Voice: ElevenLabs API for realistic interviewer voice synthesis
• Features: Adaptive question flows, speech recognition (Whisper), candidate scoring, real-time feedback

End-to-end platform (Web + Mobile + Backoffice) built for Softinsa, an IBM subsidiary.

• Stack: React · Node.js · Express · PostgreSQL · Flutter · JWT
• Features: Course management, quizzes, certificates, admin dashboards, file uploads
• Feedback from Softinsa: "I would buy it right now."

AI & ML · LangChain · RAG · ChromaDB · Ollama · PyTorch · OpenCV · Fast-ALPR · Whisper

Languages · Python · TypeScript · JavaScript · SQL · C/C++

Backend · FastAPI · Node.js · REST APIs · JWT

Frontend & Mobile · React · Flutter · HTML/CSS

Data · PostgreSQL · Supabase · MongoDB

Tools · Docker · Git · Postman · Figma

• 📍 Germany
• 🎓 Computer Engineering Graduate @ ESTGV/IPV
• 💼 Open to full-time remote roles
• 🇩🇪 Learning German (A1)

📧 alexandre@alexandrefernandes.dev 🔗 alexandrefernandes.dev · LinkedIn