Project History
Highlights
Medosync Ltd 10/2024 – 05/2025
Senior DevOps & Full-stack Developer
- Support maintenance of PHP practice management software handling
appointments, billing, and insurance claims.
- Develop and maintain hospital software for digital billing and
claims processing using Rust, Python, and Vue.js.
- Maintain and extend an Express-GraphQL backend for insurance claims
management, including dependency updates and delivery pipeline
setup.
- API migration to an OpenAPI specification generated TypeScript
client.
Technologies
Vue TypeScript Jest
Cypress OpenAPI Rust
Python GitHub Action Azure Cloud
Kubernetes PHP Node.js
Express GraphQL PostgreSQL
Briends GmbH 11/2023 – 2024
- Inhouse Development of a high scalable real-time quiz web
application in an event-driven architecture with SvelteKit and
Kotlin.
- Utilization of Websockets for real-time communication between
frontend and backend.
- Development of a Kotlin backend with Vert.x for real-time
communication and event sourcing.
- Enlisted for Discord App Pitches
2024.
Technologies
Svelte/SvelteKit TypeScript
Jest Playwright Websockets
Kotlin Vert.x Docker
NixOS Terraform Google Cloud
Kubernetes
Klingel Gruppe 2021
– 2023
Senior DevOps & Full-stack Developer in E-Commerce Search
Engine Team
- Development and maintenance of a highly scalable product pipeline
for indexing in a Solr cluster, ingesting close to 20 million product
updates daily.
- Preact Frontend development of the product listings, search engine,
and product detail page.
- Developing new features and maintaining the shop frontend,
integrating the company design system.
- Adding Jest tests for new components not covered by the design
system.
- Vue.js Frontend & Scala backend development of the shop
backoffice enabling SEO and On-Site manager to configure campaigns,
navigation, and product listings.
- SRE of the shop nginx reverse proxy serving over 100 million
requests daily.
- Maintaining and administrating Kubernetes cluster (Administration
Interest Group).
Klingel Gruppe (K - Mail Order GmbH & Co. KG) was the third
biggest multi-channel mail order company in Germany with a focus on
fashion and lifestyle products.
Technologies
JavaScript Preact Jest
Selenium Vue.js
Design System in Figma Scala Solr
AWS Gitlab CI/CD Kubernetes
Docker DataDog Postgres
Apache Kafka NixOS Nginx
Terraform Renovate
Fielmann AG 2019 –
2020
Tech Lead iOS App of a Tablet Based Centration Team
- Technical Lead Developer in a Research & Development Team of 10
for an Xamarin iOS enterprise app for opticians in 700 stores to measure
optometric values of customers.
- Conception of quality assurance and testing strategy in close
cooperation with opticians to ensure highly critical optometric values
are measured precisely.
- Accompany team in a successful rollout of the app to over 700 stores
in DACH region.
- Maintaining a Jenkins pipeline for continuous integration and
delivery.
Technologies
C# .Net Xamarin
Jenkins AWS iOS
fastlane
Fielmann AG 2018 –
2019
Senior DevOps & Full-stack Developer in Product Catalog
Team
- Greenfield Kotlin backend & React frontend development of a
product catalog for shop assistants.
- Support in TypeScript frontend development with React and
Redux.
- Setup of a continuous deployment pipeline in concourse CI as a
template for other teams.
- Mentoring in kubernetes & cloud infrastructure in AWS.
Technologies
TypeScript React Redux
Jest Cypress Kotlin
Kubernetes Docker AWS
Kafka Concourse CI Spring Boot
Postgres NixOs Terraform
Oaktree Technologies GmbH
2019 – 2020
Consultant for Project Onboarding Tablet Based
Centration
Consultant for Data-Science Team in Architecture, Automatization and
Development Workflow
- Setup of processes meeting European medical device regulations (MDR)
regarding software development processes and documentation.
- Mentoring data-science team in development workflow for reproducible
notebooks and CI/CD.
Oaktree Technologies GmbH is a subsidiary of the Fielmann AG. The
company is specialized in developing digital solutions for opticians.
Centration app is now branded as Qvido.
Technologies
Python NumPy Jupyter Notebooks
Github Actions Microsoft Azure
Verlag Herder GmbH –
Kitalino GmbH 2021
Consultation on Architecture, Automatization, and API
Development
- Conceptualization of a microservice architecture for the Kitalino
platform for media and data exchange.
- Support in transition to a Jenkins CI/CD pipeline (Blue Ocean).
- Development of a new REST API for integration of Kitalino with
leading daycare management software.
- Accompany Keycloak integration for user management.
- Training in frontend testing with Jest.
The Kitalino GmbH is a subsidiary of the Herder Verlag that offers
digital solutions for daycare centers and their supporting
organizations. As a core feature Kitalino offers digital development
documentation of children.
Technologies
Jest JavaScript
Distributed Architectures Keycloak
Docker & Docker Compose MySQL
Nginx PHP 7 & Symfony 4
Jenkins Pipeline
Briends GmbH Papego –
Co-Founder 2012 – 2023
Co-Founder of a Startup in the Publishing Industry
- Technical lead in architecture and development.
- Greenfield development of a digital reading app in iOS and Android
using Angular with TypeScript (Ionic framework).
- Architecture design and development of a backend for processing and
analyzing book data.
Papego was an app for continuing reading printed books digitally,
supported by several German publishers. The app was available for iOS
and Android and was critically acclaimed by the press. The app was
discontinued in 2023.
Technologies
TypeScript Angular Ionic
Jest Haskell Google Cloud
Cloud Build Kubernetes Docker
Nix React Svelte
Swift Kotlin Postgres
ElasticSearch Google Cloud Build CI/CD
NixOS Terraform
Awards
Qualifications
Focus
- Functional Programming and Architecture
- Automatisation and Continuous Integration & Delivery
- Cloud Architecture, Distributed Systems & Microservice
Architecture
- Self-Organized Agile Teams
References
