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Kitty-Hivens/README.md

Hi there, I'm Haru ๐Ÿ‘‹

Java Backend Developer (Junior) | Linux Specialist

I am a software developer based in Germany ๐Ÿ‡ฉ๐Ÿ‡ช (Husum area) with a passion for building reliable systems and optimizing runtime environments. My expertise ranges from Enterprise Java architectures (Spring Boot, Contract-First) to Low-level Linux automation (Bash, Wine/Wayland).

Currently seeking a Junior Developer or Apprenticeship (Ausbildung) position.


๐Ÿš€ Featured Projects

A comprehensive full-stack simulation of a retail pharmacy system.

  • Architecture: Contract-First Development (OpenAPI as Single Source of Truth).
  • Backend: Spring Boot 4, Java 21, Spring Security (JWT/RBAC).
  • Frontend: Angular 21 (Zoneless/Signals), Auto-generated API client.
  • Engineering: Database migration via Flyway, strict DTO validation, Docker Compose.

๐ŸŽฎ Aura Launcher

A next-generation, open-source game client written in Kotlin.

  • Tech: Kotlin 2.3, Java 25 (LTS), Compose Multiplatform (Skia).
  • System: Non-blocking I/O (Coroutines), custom process orchestration, Zip-Slip protection.
  • Architecture: Clean Architecture with MVI pattern.

Advanced system automation tool for low-latency gaming on Linux.

  • Tech: Bash, Yad (GUI), Wine protocols.
  • Optimizations: Automates PipeWire latency tuning and Wayland integration.
  • Impact: Simplifies complex Wine configurations for the community.

๐Ÿฆ Bank API Service

A reliable transactional banking service backend.

  • Focus: Transaction management (ACID), concurrency control, and data integrity.
  • Stack: Spring Boot, PostgreSQL/MariaDB, Hibernate.

๐Ÿ›  Technical Stack

Domain Technologies
Backend Java Spring Hibernate
System & Linux Bash Linux Wine
Frontend Angular TypeScript Tailwind
Database MariaDB PostgreSQL Flyway
DevOps & Tools Docker Git IntelliJ

๐Ÿ“Š GitHub Stats


๐Ÿ“ Info & Contacts

  • Location: Husum, Germany
  • Languages:
    • ๐Ÿ‡ท๐Ÿ‡บ Russian (Native)
    • ๐Ÿ‡ฌ๐Ÿ‡ง English (B1/B2 - Working Proficiency)
    • ๐Ÿ‡ฉ๐Ÿ‡ช German (A2 - Actively Learning)
  • Interests: Low-level system optimization, Backend Architecture, Japanese Culture.

Profile Views

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  1. Pharmacy Pharmacy Public

    Enterprise-grade Pharmacy Management System & POS built with Spring Boot 4 and Angular 21. Features FEFO inventory logic, optimistic locking, and contract-first OpenAPI architecture.

    TypeScript 2

  2. linux-osu-stable-installer linux-osu-stable-installer Public

    Play osu! (stable) on Linux with zero latency. Automates everything: fonts, audio buffers, and even Discord RPC. Just run and play.

    Shell 1 1

  3. Bank-API-Spring Bank-API-Spring Public

    Transactional REST API prototype. Focuses on concurrent account operations, ACID compliance fundamentals, and secure data handling.

    Java

  4. Aura-Launcher Aura-Launcher Public

    Modern, lightweight, and open-source launcher for SmartyCraft built with Kotlin & Compose Multiplatform. ๐Ÿ’œ

    Kotlin 11 1