Ownership
I take features from requirements through API and data model to tests, delivery and observability.
Backend Engineer · Java/Kotlin · Spring Boot · Cloud
I build backend systems with stable APIsclear data modelsrobust integrationsreliable delivery
I am a Cloud Backend Developer at Cosee, building domain-oriented backend systems with Java/Kotlin, Spring Boot, PostgreSQL, AWS and reliable delivery. In cross-functional Scrum teams I clarify requirements, work closely through pairing and reviews, and share knowledge so solutions remain sustainable for the team.
About me
About me and how I work
Backend implementation, domain clarification and delivery belong together. Good software comes from shared decisions, stable system boundaries and reliable communication with product, stakeholders and teammates.
Team impact
In the team, I share knowledge through code reviews, pair programming and technical coaching so decisions become shared.
Product orientation
I shape requirements with stakeholders so technical options stay understandable and realistic to evaluate.
Technical focus
Backend engineering is the core. Architecture, delivery, teamwork and product understanding are the areas where I create value beyond writing code.
Backend
Java/Kotlin, Spring Boot, REST APIs, data models, tests, authentication, validation and clean interfaces.
KotlinJavaSpring BootRESTPostgreSQLTesting
Architecture
Domain-driven design, hexagonal architecture, OpenAPI, integration boundaries, domain modules and maintainable structures.
Domain-driven DesignHexagonal ArchitectureOpenAPIIntegration
Delivery
AWS, Docker, Terraform, CI/CD, Kubernetes/Helm, Caddy, monitoring and the connection between development and operations.
AWSTerraformDockerGitLab CIMonitoringKubernetes
Product & Stakeholders
Feature planning, Scrum, pair programming, client workshops, technical clarification, LLM-assisted development workflows, product-owner-adjacent responsibility and personal apps, games and product ideas.
Feature PlanningStakeholdersProduct ThinkingLLM WorkflowsSwiftUIGame AI
Practical working skills
Beyond stack and tools, these are the skills that turn requirements into stable software in a team.
Scalable backend architectures
Domain modules, robust interfaces and clear system boundaries.
Requirements analysis and user stories
Clarifying, prioritizing and translating requirements into deliverable backend work.
LLM-assisted development workflows
Using AI tools deliberately for research, review, tests and iteration.
Continuous delivery and CI/CD
Pipelines, containers and release flows for repeatable delivery.
Scrum and cross-functional teams
Collaboration with product, design, QA and stakeholders in clear Scrum routines.
Monitoring and production analysis
Runtime signals, logs and failure patterns for stable operations.
Clean code and clean architecture
Code that keeps domain logic testable, understandable and easy to evolve.
Unit, integration and contract tests
Tests where domain rules and interfaces need protection.
Pair programming and technical coaching
Sharing knowledge, explaining decisions and strengthening backend and testing practices.
Stakeholder coordination
Explaining technical options clearly and supporting product decisions.
Tech-Talk
Tech talk: AWS Cloud Quest to AI Engineer?
Tech talk with Patrick Wolf about AWS Cloud Quest, the Generative AI role and whether game-based cloud training works as practical technical learning.
Professional Experience
Professional experience
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
Backend Platforms for Recruiting and Assignment Planning
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.
KotlinSpring BootPostgreSQLFlywayOpenAPI
Cosee GmbH · 02/2025 to 06/2025
Data and Research Platforms
Backend and platform
Evolution of modular platforms with REST backend, worker processes, authentication, messaging, mobile clients and containerized operations.
C#.NETPostgreSQLRabbitMQKeycloak
Cosee GmbH · 2020
SPIEL.digital Platform
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.
JavaSpring BootPostgreSQLFlywayTerraform
Cosee GmbH · 06/2020 to 12/2020
ENACT / CoraLibre Data Platform
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.
JavaSpring BootPostgreSQLAWS ECSAWS RDS
Private projects
Private projects
Private projects show additional breadth, initiative and technical curiosity alongside professional experience.
WinkelMeister
In the App StorePublished iOS app for precise construction-site calculations
FlutterDartiOS
View project
Boardgames AI Lab
In developmentGame-AI platform for MCTS, self-play, training and model evaluation
JavaSpring BootReact
View project
ReelHaven
In active developmentSwiftUI cozy fishing game with progression and collection systems
SwiftUIiOSGame
View project
RoBuddy
In useNative macOS overlay app with animated desktop buddies
PythonPyObjCmacOS
View project
Plant Pi
ExperimentRaspberry Pi and sensor data platform for plant monitoring
PythonRaspberry PiESP32
View project
Contact
Contact and CV
If my profile fits a backend, platform or product-adjacent engineering role, reach me by email, phone or LinkedIn. I am interested in roles where backend depth, teamwork and product closeness come together.