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mattknatt/README.md

Hey, I'm Mattias 👋

Java Developer Student · Backend Enthusiast · Full-stack in progress

IT-Högskolan Java Spring Boot PostgreSQL

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About Me

I'm a Java developer student at IT-Högskolan, focused on building clean, well-structured backend systems. I enjoy working close to the data layer — designing entities, wiring up repositories, and making sure everything talks to the database the way it should. I'm also learning different frontend possibilites on my way to becoming a full-stack developer.

  • 🎓 Currently studying Java development at IT-Högskolan
  • 🔧 Interested in backend development, REST APIs, and data persistence
  • 🌱 Growing my skills in Spring Boot, JPA/Hibernate, and system design
  • 🤝 Comfortable working in teams and contributing to collaborative projects

Tech Stack

Languages & Frameworks

Java Spring Boot React TypeScript JavaFX Hibernate Thymeleaf

Databases

MySQL PostgreSQL

Messaging & Infrastructure

RabbitMQ gRPC Kubernetes Nginx

Tools & Practices

Maven Docker JUnit5 Git Fly.io GitHub Actions


Projects

🏋️ boka. — Gym Class Booking App

Spring Boot · React 19 · TypeScript · PostgreSQL · Fly.io · GitHub Actions

A high-performance, full-stack gym class booking application built with a focus on clean architecture, developer experience, and cloud-native deployment. Features Google OAuth2, atomic reservations, and a personal bookings dashboard.

Deployed as a single Docker unit on Fly.io with a serverless Neon Postgres backend and automated CI/CD via GitHub Actions.

🔗 boka. GitHub repo · Live deployment


🤖 Personal AI Companion

Spring Boot · React 19 · TypeScript · Vite · Fly.io · Vercel

A full-stack AI chat application with a terminal-inspired UI, built on a custom Spring Boot middleware layer that bridges clients with an LLM backend. Features switchable AI personalities, per-session conversation memory, and resilient retry logic with exponential backoff.

The backend is deployed on Fly.io and the React frontend on Vercel, communicating via a single POST /api/v1/chat endpoint backed by OpenRouter.

🔗 Backend · Frontend · Live deployment


💬 Triasent — Microservices Chat with an LLM Bot

Spring Boot · OAuth2/OIDC · PostgreSQL · RabbitMQ · gRPC · Docker · Kubernetes

A microservices chat application where users converse with an LLM-backed assistant, built to explore realistic distributed-system concerns. Features secure OAuth2/OIDC flows via a Spring Authorization Server, a BFF gateway holding the session cookie, and an event-driven bot reply path over RabbitMQ using a transactional outbox pattern.

Each service owns its own database (database-per-service), conversations are isolated per user by a stable user UUID, and the whole system runs identically under Docker Compose or on Kubernetes.

🔗 Triasent


🎵 myPod — Music Player with iTunes Integration

JavaFX · JPA/Hibernate · MySQL · iTunes API

A retro-inspired desktop music player built as a group project. Features a custom Click Wheel navigation interface for browsing music fetched from the iTunes Search API, stored locally for offline access.

My contributions: iTunes API client, JPA entity design, repository layer, database initialization.

🔗 myPod


Currently Learning

  • REST API design & best practices
  • Spring Security
  • Clean architecture & design patterns
  • Frontend environments

Always open to collaborating on interesting Java projects!

Pinned Loading

  1. boka boka Public

    Booking system for gym classes

    Java

  2. spring-llm-gateway spring-llm-gateway Public

    Java 1