Backend
APIs, integrations and business rules.
- NestJS
- Node.js
- TypeScript
- Go
- Java
- Spring Boot
- Python
- FastAPI
Mickael Gueds
Full Stack Developer · AI
About me
I'm a full stack developer who builds web products end to end, from the database to the interface. On the backend I work with Node.js and TypeScript, Go, Java/Spring Boot and Python on PostgreSQL; on the frontend, with React, Next.js and TypeScript, always backed by automated tests.
I ship AI to production and measure what matters: cost per answer, quality and latency. I've worked in healthcare, pharmacy retail and government. I'm based in Teresina, Brazil, finishing a Software Engineering degree (Dec 2026), with advanced English.
Stack & skills
Frontend
Web interfaces and mobile applications.
- React
- Next.js
- TypeScript
- React Native
Data & AI
Relational data, RAG and computer vision.
- PostgreSQL
- MySQL
- Prisma
- Python
- OpenCV
Cloud, CI/CD & observability
Cloud deployment, CI/CD and production monitoring.
- AWS
- Docker
- GitHub Actions
- Grafana
- 2.9×
- cheaper AI answers, with identical results on 20 out of 20 questions
- 19.3% → 0.65%
- wrongful AI refusals, measured by an automated 400-question evaluation
- ~35%
- faster response times on Piauí State Public Security systems
Projects
Safe Academy
MedSafe · AI in a healthcare education appPrivate project
AI assistant inside a React Native app that recommends clinical tools and answers from the correct drug leaflet, citing its source.
- Prompt cut from ~17,900 to ~2,500 tokens with hybrid search (BM25 + embeddings): answers 2.9× cheaper
- Prompt caching: 47% lower cost and 65% lower latency
- Spring Boot migration proven with golden tests (2,115/2,115) and JUnit grown from 667 to 2,101 tests
- React Native
- TypeScript
- Java
- Spring Boot
- MySQL
- Embeddings
- Grafana
- Loki
Chico Delivery
Online pharmacy storePrivate project
API and storefront in a monorepo, with payments, radius-based delivery and WhatsApp support.
- Hexagonal architecture: 11 domain modules isolated from 11 swappable adapters
- Pix and card payments (Pagar.me and Mercado Pago) behind one interface, with idempotent webhooks
- 158 test files plus load tests
- Node.js
- Fastify
- TypeScript
- Next.js
- PostgreSQL
- Prisma
- Zod
- Docker
Praxia
3D reconstruction of propertiesPrivate project
Platform that turns property videos into a 2D floor plan and a 3D model, with heavy processing on external GPUs.
- API with 20+ endpoints and a job queue for GPU workers (Modal/RunPod)
- Computer vision pipeline that picks the sharpest frames
- 3D viewer and 2D floor plan editor, with 141 tests
- Python
- FastAPI
- OpenCV
- ffmpeg
- three.js
- Docker
GoX
Internal systems, data and AIPrivate project
Frontends for internal systems, a RAG knowledge base and real-time integrations between systems.
- 5 internal systems in React with 116 test files
- Go job queue with concurrent workers (SKIP LOCKED) and RAG on pgvector
- CI/CD with 344 Go test files and automatic deploys
- React
- TypeScript
- Go
- PostgreSQL
- pgvector
- MCP
- GitHub Actions
InfinityMatriz
Study mentoring platformPrivate project
Student, mentor and admin areas with scheduling, flashcards, reviews, meetings and metrics.
- Typed API clients generated from the OpenAPI contract
- KPI dashboard and engagement charts
- Next.js
- React
- TypeScript
- Orval
- MSW
- Recharts
TRIN
Piauí State Public Security DepartmentPrivate project
APIs and interfaces for large-scale government systems under high request volume.
- ~35% faster responses with caching, pagination and query optimization
- Modules refactored to Clean Architecture, with JWT authentication and RBAC
- Next.js
- TypeScript
- SQL
- JWT
Experience
AI Engineer @ MedSafe
- Connected the React Native app to the Java/Spring Boot backend through an authenticated proxy with per-user quotas
- Cut the prompt from ~17,900 to ~2,500 tokens, making each answer 2.9× cheaper
- Built a 400-question automated evaluation and observability with Grafana and Loki
Full Stack Python Developer (freelance) @ Praxia
- FastAPI REST API with 20+ endpoints and a processing queue for GPU workers
- three.js 3D viewer and 2D floor plan editor, with 141 pytest tests
Backend Developer (freelance) @ Chico Delivery
- Fastify API with hexagonal architecture and Zod contracts shared with Next.js
- Pix and card payments via idempotent webhooks, WhatsApp, SMTP and S3 storage
Software Engineer (Full Stack & AI) @ GoX
- React and TypeScript frontends for 5 internal systems, with 116 test files
- Go job queue, RAG pipeline on pgvector and webhook-based connectors
- GitHub Actions CI/CD with 344 test files and automatic deploys
Frontend Developer (freelance) @ InfinityMatriz
- Student, mentor and admin areas in Next.js, with a KPI dashboard
- Typed API clients with Orval, MSW mocks and forms with React Hook Form and Zod
Full Stack Developer @ TRIN · Piauí State Public Security Department
- REST APIs and Next.js interfaces for large-scale government systems
- Cut response times by ~35% with caching, pagination and query optimization
Data Analyst @ SEPLAN · Piauí State Planning Department
- Python ETL pipelines (Pandas, NumPy) producing reports for public policy
Backend Developer @ Direct Telecom
- NestJS REST APIs for fleet, mileage, staff and messaging management, with PostgreSQL and Prisma
- Cut manual operations by about 25% by automating business workflows
Contact
Open to full stack and AI engineering roles, on-site in Teresina or remote. Reach out however you prefer.