Four projects told in depth: what I built, how it works inside and what I had to fix. Further down, the practice ones.
Microservices system for managing a health clinic — patients, appointments, admissions and billing with JWT auth, automatic migrations and an AI medical assistant.
Java 21 · Spring · Microservices · PostgreSQL · Redis
Exchange-side simulator for Cboe's BOE binary protocol, with a price-time matching engine, trading bots, REST API, WebSocket and a dashboard in a single JAR.
Java 21 · Javalin · RocksDB · WebSocket · Docker
Android app to turn my computers on from home and off from anywhere. Wake-on-LAN to wake them, SSH to shut them down and ICMP ping to know when they're online.
Android · Java · Kotlin · SQLCipher · SSH
My first solo backend project, a user CRUD with MySQL and JWT. Revisiting it later, I found the sign-up token unlocked the whole API; I fixed it and covered every flaw with tests.
Java · Spring · MySQL · Flyway · JWT
Learning projects, Alura Latam challenges and study material.
14-chapter hands-on guide to prepare for the Oracle Certified Professional Java 21 exam.
Java 21
Personal LeetCode solutions in Java, organized by problem with execution examples.
Java · Algoritmos
Java CLI that searches books via the Gutendex API and persists authors in PostgreSQL.
Java · Spring Boot · PostgreSQL · Spring Data JPA
Console currency converter that fetches live exchange rates from ExchangeRate-API.
Java · ExchangeRate-API · Gson
Playable Arkanoid clone built with HTML5 Canvas and vanilla JavaScript — no frameworks.
JavaScript · HTML5 Canvas · CSS
Web app that encrypts and decrypts messages using vowel substitution. Alura challenge.
JavaScript · HTML · CSS
