Portfolio
Professional project work, technical focus areas and private projects with short overviews and detail pages.
Backend Work
I have worked at Cosee on backend and cloud topics since 09/2020, and since 01/2025 full-time as a Cloud Backend Developer. My work connects backend services, cloud delivery, architecture, Scrum routines and product-facing coordination across client projects.
Cosee GmbH · since 04/2025
Cloud Backend Developer
Development of domain-oriented backend services for applications, employee profiles, contract workflows, assignment planning, documents and asynchronous workflows including direct domain coordination.
Direct client coordination, feature scoping and Scrum collaboration in cross-functional teams
Hexagonal architecture and domain-driven design
Cosee GmbH · 02/2025 to 06/2025
Backend and platform
Evolution of modular platforms with REST backend, worker processes, authentication, messaging, mobile clients and containerized operations.
Backend functionality for profiles, experiment logic and data processing
Messaging and worker flows for synchronization and data processing
Cosee GmbH · 2020
Backend and infrastructure contribution
Backend and infrastructure work for SPIEL.digital: Spring Boot backend, automated AWS infrastructure and CI/CD for a platform built in four months for the world's largest board game fair.
Spring Boot backend for platform and back-office features
Automated AWS infrastructure with Terraform and GitLab CI/CD
Cosee GmbH · 06/2020 to 12/2020
Backend and infrastructure contribution
Co-development in the ENACT/CoraLibre context: Covid data processing, Spring Boot backend, PostgreSQL and infrastructure for a Google-free Corona-Warn-App alternative.
Spring Boot service for processing, storing and serving Covid statistics
Contributions to collecting and preparing public Covid data
Cosee GmbH · 2022 to 2023
Java Backend Developer
Feature development and maintenance of a backend service integrating digital marketplaces, focused on robust interfaces, persistence and deployment.
Adapter and interface logic for external platforms
Domain-specific mapping DSL based on JsonPath
Cosee GmbH · 2021 to 2022
Architect and Java expert in the team
Design, implementation and deployment of microservices in logistics and warehouse contexts, including an official architect role for backend design, service interfaces, event-oriented communication and Java knowledge transfer inside the team.
Official architect role for backend microservices and system boundaries
Java expertise and support for external developers in the team
Cosee GmbH · internship, working-student period and early full-time work
Backend and cloud
Backend and infrastructure work on a business cockpit: from building during the internship to maintenance as a working student and continued development in a full-time context with domain coordination.
Spring Boot backend for cockpit and data aggregation features
Domain clarification, feature coordination and product-adjacent decisions
Cosee GmbH · across projects
Cloud and delivery
Cross-project work on infrastructure, CI/CD, container builds, monitoring and cloud services as an extension of backend development.
AWS infrastructure for backend-adjacent services
Infrastructure as Code with Terraform
Private projects
Private project
Published iOS app for precise construction-site calculations
Offline app for triangle, spacing, cutting and level workflows in carpentry.
Published in the App Store with testable calculation logic and real domain workflows.
Private project
Game-AI platform for MCTS, self-play, training and model evaluation
Local AI lab for board games, PUCT/MCTS, self-play and traceable model artifacts.
Shows backend and AI engineering beyond CRUD: rules, jobs, training, registry and UI work together.
Private project
SwiftUI cozy fishing game with progression and collection systems
Playable iOS fishing game with progression, catalog, balancing and save games.
Makes product thinking, local game logic and persistent state visible.
Private project
Native macOS overlay app with animated desktop buddies
Native macOS overlay app with AppKit, SpriteKit, hotkeys and app bundling.
Shows system-level integration, animation and packaged desktop delivery.
Private project
Raspberry Pi and sensor data platform for plant monitoring
Small IoT platform for sensor data, local services, MQTT and Pi hardware operation.
Connects sensors, data flows, Docker and pragmatic operations on small hardware.