Luís Peixoto

Backend Software Engineer · Java · Spring Boot · Distributed Systems

peixotomdb@gmail.com|linkedin.com/in/peixotomdb|github.com/peixotomdb

Vila Real, Portugal · Open to relocation or full remote · EU citizen, no permit sponsorship needed

Backend engineer who owns high-scale Java systems and fixes what others get stuck on. Three years at CEiiA, one of Portugal's leading engineering centres, building AYR, an award-winning platform that validates millions of trips a month.

Selected achievements

• Held a production platform alone for ~6 months after every senior engineer left: 15 microservices, 20+ incidents resolved, zero data loss, millions of trips flowing uninterrupted
• Cached authentication tokens in Redis, cutting latency on every request from ~300ms to ~14ms (20× faster)
• Built and ran 15+ Spring Boot microservices processing hundreds of millions of records
• Wired AI agents into daily engineering: a 30-minute daily report now writes itself, test suites land in hours instead of days, scaffolding in minutes instead of ~5 hours

Professional experience

Intern to owner of large-scale distributed systems, now driving cross-team technical direction alongside the platform architect.

• Works with the platform architect on solution design and architectural trade-offs across multiple products
• Decomposes monoliths into clean, performant microservices with authentication and security hardening built in
• The engineer other teams turn to for the problems with no obvious answer

New European Bauhaus prize winner: quantifies CO₂ avoided through sustainable mobility, rewarded as digital green credits.

• Built trip validation and digital wallet services: accounts, transfers, purchases, green-credit rewards
• Delivered real-time CO₂-avoided monitoring across multiple calculation methods, and onboarded major partners
• Designed REST APIs on PostgreSQL; removed N+1 query patterns by batching data access
• Ran async messaging on Kafka with Redis caching; tracked health and SLA compliance in Grafana and Prometheus
• Built internal React/Next.js dashboards for trip processing and errors, ending reliance on the frontend team

Data ingestion & monitoring (2023 – 2024): ingestion, processing and monitoring of trips and vehicles. Foundational Spring Boot and PostgreSQL work at scale.

Earlier: Frontend Developer intern at X-Plora, responsive front-ends and reusable components in Vue.js (2022) · Student Technology & Digital Innovation, UTAD Student Associations (2022 – 2023).

Technical skills

Core

Java, Spring Boot, Spring Security, JPA/Hibernate, REST APIs, PostgreSQL, Redis, Apache Kafka, RabbitMQ

Platform

Docker, Kubernetes, GitLab CI, SonarQube, Grafana, Prometheus, JUnit, Mockito, Swagger/OpenAPI, Git

Also

TypeScript, React, Next.js · Claude Code and local LLM agents in the daily workflow · exploring Go, Rust, Tauri

Personal projects

Education, certifications and languages

Certifications: CMMI · SOLID Architecture · Java Development Course

Languages: Portuguese (native) · English (professional fluency, C1)