// Computer Scientist (Diplom Informatiker FH)

Curriculum Vitae

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# Profile

Senior software developer and architect with more than 20 years of experience. Focus areas: scalable backends in Kotlin, Spring Boot and Micronaut as well as native and cross-platform mobile apps (iOS/SwiftUI, Android/Jetpack Compose, Kotlin Multiplatform). I design maintainable architectures following DDD and hexagonal principles and deliver test-driven, production-ready code — accelerated by agentic AI tooling.

▸ Work Location: Preferably Remote ▸ Language Skills: German (Native), English (Very Good)

# Skills

Backend

Kotlin Java Spring Boot Micronaut Ktor JPA/Hibernate REST Kafka Microservices

Mobile · iOS / Android

Swift SwiftUI UIKit Combine Jetpack Compose Kotlin Multiplatform Compose Multiplatform

Architecture & Methods

Domain-Driven Design Hexagonal Clean Code TDD Scrum Kanban SAFe

Cloud & DevOps

AWS Azure Docker Kubernetes OpenShift GitLab CI/CD Jenkins Bitrise

Data & AI

PostgreSQL MS SQL Oracle MongoDB Neo4j Realm Agentic AI (Claude Code) Python PyTorch

# Industry Domains

Healthcare & Telematics Automotive Retail & Consumer Goods Energy Pharma & Chemicals Education

# Education

1996–2003 Computer Science degree, graduated as Diplom Informatiker (FH)
1995 Abitur (University Entrance Qualification)
1991 RF Technician certification

# Teaching & Continuing Education

2015 – 2020 Lecturer for iOS/Swift development, DHBW Mannheim
since 10/2025 Continuing education in LLM & AI (Python, PyTorch)
since 10/2025 Continuing education in Kotlin Multiplatform (KMP)

# Core Areas and Frameworks

Spring / Spring Boot

  • ✓ Experience with Spring and Spring Boot using Kotlin
  • ✓ Scalable and efficient applications with Spring Framework
  • ✓ RESTful APIs with Spring Boot and Kotlin
  • ✓ Microservices architectures with Spring Cloud
  • ✓ Spring Data JPA for database integration

Kotlin

  • ✓ Kotlin Multiplatform (KMP) for cross-platform development
  • ✓ Compose Multiplatform UI Framework
  • ✓ Ktor HTTP client and server framework
  • ✓ Coroutines for asynchronous programming
  • ✓ Kotlin Multiplatform Mobile (KMM)

iOS / Swift / SwiftUI

  • ✓ SwiftUI with Combine and Async/Await
  • ✓ CoreData and RealmDB for local data persistence
  • ✓ Swift Package Manager
  • ✓ UIKit and Xcode development environment
  • ✓ Unit testing and debugging

AWS

  • ✓ AWS Lambda for serverless functions
  • ✓ AWS S3 for data storage
  • ✓ Complex AWS architecture design
  • ✓ AWS Amplify for mobile backends

Vaadin

  • ✓ Vaadin Flow (Java-based)
  • ✓ Responsive and cross-platform web applications
  • ✓ Integration with Spring Boot and Java EE
  • ✓ Vaadin Designer and Vaadin Testbench

# Skills Overview

Programming Languages

Kotlin Excellent · 5 years
Kotlin Multiplatform Advanced · 1 year
Java Excellent · 20 years
Swift Excellent · 9 years
SwiftUI Excellent · 4 years
UIKit Excellent · 10 years
Vaadin (8, 23, 24) Good · 5 years
SQL Excellent · 20 years
Groovy Good · 5 years
Objective-C Advanced · 2 years
CI/CD (Jenkins, Bitrise) Excellent · 15 years
Git / GitHub / GitLab Excellent · 12 years

Databases

MySQL Oracle DB Microsoft SQL Server IBM DB/2 MongoDB Neo4J PostgreSQL

Data Communication

JSON 10 years
REST (JSON) 12 years
Web Services / SOAP 10 years
Apache Kafka / kSQL 3 years
Apache Camel 3 years

Projects

Healthcare (Gene Sequencing)

November 2025 – present

Senior Software Developer / Architect

Design and development of a scalable backend system for analyzing genetic sequencing data. Hexagonal Architecture, Domain-Driven Design, REST APIs with Ktor and Micronaut, GitLab CI/CD. Integration of the RKI trust center via the German telematics infrastructure.

Kotlin Ktor Micronaut MS SQL PostgreSQL Telematics Infrastructure GitLab CI/CD Python JUnit MockK Scrum

AI / Machine Learning Training

October 2025 – present

Self-directed

Implementation of a custom GPT-style ChatBot. Understanding LLM fundamentals, training with custom data, deep learning and machine learning foundations.

Python PyTorch Jupyter Pandas Deep Learning

Kotlin Multiplatform Training

October 2025 – present

Self-directed

Prototyping cross-platform mobile apps with KMP. Native UIs (SwiftUI, Jetpack Compose), shared backend in Kotlin, cloud integration with Firebase and AWS.

Kotlin Multiplatform SwiftUI Jetpack Compose SQLite Couchbase Lite Ktor Firebase AWS Gradle

Retail / Consumer Goods (Rossmann)

June 2025 – October 2025

Senior Software Developer

Refactoring and theming of the master data portal according to design specifications, in close coordination with the design team. CSS adjustments and Vaadin code refactoring.

Java 21 Vaadin 24 CSS Maven Git Jira Confluence Figma

Integrated Communications Agency

May 2025 – October 2025

Senior Software Developer, Software Architect

Development of a multiplatform app for iOS and Android with KMM. SwiftUI and Jetpack Compose UIs, RealmDB, AWS Amplify, Python data processing.

Kotlin Swift KMM Jetpack Compose SwiftUI RealmDB AWS Amplify Python Gradle

Healthcare / Telematics Infrastructure

August 2024 – April 2025

Senior Software Developer / Architect

Development of a reference implementation for "Prove of Patient Presence" (PoPP). Cryptographic methods, PKI integration, smart card connectivity (eGK).

Java 21 Spring Boot Docker Maven Cryptography PKI Smart Card Jenkins SonarQube Kanban

Optical Industry

November 2023 – April 2024

Senior Software Developer

Development of an automated material tracking solution for production control. IoT and OPC UA integration.

Kotlin Spring Boot JPA Kubernetes Azure Python IoT OPC UA Microservices

Energy Supply

June 2023 – October 2023

Consultant, Software Developer

Design and development of a configurable parser for analyzing and transforming business data from a gas trading system.

Java 17 Kotlin Spring Boot 3 Gradle Docker Spring Batch XSLT TDD Kanban

Healthcare (116117 App)

July 2022 – present

QA, Architecture Consulting

Quality assurance and architecture consulting for a nationwide health app. Code reviews, best practices, pull request processing.

Swift SwiftUI Kotlin Jetpack Compose Keycloak Combine CoreData

Retail B2B (Hardware Stores)

July 2022 – March 2023

Senior Developer, Backend

Development and maintenance of various backend solutions and iOS apps in the retail B2B space.

Kotlin Java Spring Boot JPA Docker Swift SwiftUI AWS Keycloak Ktor

Automotive (Porsche Digital)

September 2021 – March 2022

Senior Developer

Development of an app and backend for digitalizing customer-facing sales processes. Event sourcing, analytics, microservices.

Swift SwiftUI Kotlin Spring Boot MongoDB AWS Lambda Kafka Docker Kubernetes Keycloak

Healthcare (Electronic Health Record)

July 2021 – September 2021

Senior Developer

Design and implementation of a desktop client for the electronic patient record. Smart card integration on MacOS.

Kotlin Jetpack Compose Desktop Swift MacOS Smart Card

Education / Finance

January 2021 – August 2021

Senior Developer

Design and implementation of microservices as core elements of a monolith-to-microservices migration.

Kotlin Spring Boot Spring Data PostgreSQL Docker AWS Lambda AWS S3 Ktor

Market Research

December 2020 – January 2021

Developer

Development of an iOS SDK as a CocoaPod for a market research platform.

Swift Xcode CocoaPods AlamoFire

Tourism

July 2020 – November 2020

Software Developer

Design and development of a microservice for managing available accommodations as a "single source of truth".

Java Kotlin Spring Boot Kafka Camunda AWS MariaDB

Education (DHBW Mannheim)

September 2015 – September 2020

Lecturer

Teaching mobile application development on iOS with Swift. Creating teaching materials, demos and supervising student projects.

Swift iOS Xcode RxSwift Combine

Healthcare (iPad App)

March 2020 – June 2020

Software Developer

Design and development of an iPad app for first responder CPR training and emergency measures education.

Swift RxSwift CoreData MVVM

Pharmaceuticals (Digital Library)

December 2018 – March 2020

Software Developer, Consultant

Co-development of an internal library system for medical article research with Kafka-based event processing.

Java Spring Boot Docker Apache Kafka Kafka Streams Kotlin Redis Mark Logic

Chemical Industry

October 2016 – December 2018

Java Onsite Coordinator, Software Developer

Coordination with offshore teams in India. Development of projects in security self-service and compliance.

Java Spring Boot Hibernate MS SQL Server Oracle Apache Kafka DB2

Automotive (Compliance)

February 2016 – September 2016

Developer

Development and prototyping of a compliance web application. Integration of reporting frameworks, GUI development with Vaadin.

Java Spring Boot Vaadin Jasper Reports JPA DB2

Sports (Nike USA)

March 2014 – April 2015

Software Engineer, Consultant

Co-development of an iPad app for Nike USA. Frontend in Objective-C/iOS, backend in Java with Spring Framework and JBOSS.

Objective-C Swift Java Spring Oracle JBOSS JSON Vaadin

Internet Startup (Berkeley, CA, USA)

2000 – 2002

Architect, Developer, Co-Founder

Design and implementation of a social network platform for mapping and utilizing social networks. Middleware development with Tomcat and JBOSS.

Java J2EE EJB JBOSS MySQL JSP Linux
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