Project History
Highlights
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
- React Frontend development of the product listings and search engine
in close collaboration with the UX design team
- 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
Scala, React/Preact, Vue.js, Design System in Figma, 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 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
- Setup of a continuous deployment pipeline in concourse CI as a
template for other teams
- Mentoring in kubernetes & cloud infrastructure in AWS
Technologies
Kotlin, React, Kubernetes, Docker, AWS, Kafka, Concourse CI, Spring Boot, Postgres, NixOs, Terraform
Oaktree Technologies GmbH
2012 – 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, Jupiter 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
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
Distributed Architectures, Keycloak, Docker & Docker Compose, MySQL, Nginx, PHP 7 & Symfony 4, Jenkins Pipeline
Briends GmbH
Papego - Co-Founder 2012 – present
Co-Founder of a Startup in the Publishing Industry
- Technical lead in architecture and development
- Development of a digital reading app in iOS and Android for printed
books
- 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
Haskell, Google Cloud, Cloud Build, Kubernetes, Docker, Nix, React, Angular, Ionic, 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-Organizing Agile Teams
References
