Frederik Claus
Freelance Fullstack Software Developer
Experience
Freelance Fullstack Software Developer
Bundesdruckerei GmbH
Development of the digital organ donation register, commissioned by the Federal Institute for Drugs and Medical Devices (BfArM)
Implementation of user stories in multiple microservices (front- and backend)
Ensuring quality with unit, integration, and end-to-end tests
Conducting code reviews
Coordination with other development teams
Taking over software license checks and simplifying the process
Responsible for implementing and documenting domain logging
Setting up a development environment with Docker Compose
Freelance Fullstack Software Developer
Bundesdruckerei GmbH
Development of the digital organ donation register, commissioned by the Federal Institute for Drugs and Medical Devices (BfArM)
Implementation of user stories in multiple microservices (front- and backend)
Ensuring quality with unit, integration, and end-to-end tests
Conducting code reviews
Coordination with other development teams
Taking over software license checks and simplifying the process
Responsible for implementing and documenting domain logging
Setting up a development environment with Docker Compose
Freelance Fullstack Software Developer
Zeppelin Baumaschinen GmbH
Development of several tools for processing telemetry data for internal use
Implementation of user stories in internal data processing tools
Ensuring quality with unit and integration tests
Deploying to dedicated Linux servers
Optimizing the UX of a tool for activating machine trackers
Drafting the migration from .deb packages to Docker
Analysis of Camunda versus custom implementation
Freelance Fullstack Software Developer
AKDB (Anstalt für kommunale Datenverarbeitung)
Development of a user account, an identity solution for citizens used by specialist applications (e.g. BAföG). Clients include the federal government (bund.id) and Bavaria.
Implementation of user stories in multiple microservices (front- and backend)
Ensuring quality with unit, integration, and end-to-end tests
Migration from Ansible to Kubernetes
Optimizing the cross-team release process, reducing release time from several hours to less than half an hour
Versioning CMS texts to reduce errors and avoid redeployments
Fundamental refactoring of the IDM infrastructure and decoupling from Shibboleth increases testability and speeds up further feature development
Freelance Fullstack Software Developer
ABI (Audi Business Innovation) via Pentasys
Development of Audi On Demand, a car booking system that supports both public hubs and private hubs (apartment complexes)
Designing the REST API and documenting with Swagger
Ensuring quality with unit, integration, and end-to-end tests
Integration with the OAuth2 infrastructure and managing DB migration scripts with Liquibase
Implementing a frontend with Angular 5 using the project's frontend framework
Improving communication with other development teams
Analyzing 3rd-level support tickets and recommending automation for common tasks
Freelance Fullstack Software Developer
lextip GmbH
- Developed a web application to manage Facebook giveaways. Participants are contacted via a chatbot
- Built the B2C frontend with React, Redux, and Webpack
- Developed the backend with Clojure and PostgreSQL
- Integrated the Facebook API
- Created functional (E2E) tests with Selenium WebDriver and Docker
- Integrated the various tools using Maven
Freelance Fullstack Software Developer
Vaillant via Device Insight
Developed a REST API to manage wireless thermostats
Implemented existing Spring MVC features such as HandlerMethodArgumentResolver, validation annotations, and ExceptionHandler
Documented existing and new functionality in Confluence
Replaced existing serialization code with Jackson annotations
Redesigned the existing architecture for reading and writing data points to fix performance issues and cut bugs by reducing duplicate code
Freelance Fullstack Software Developer
check24 GmbH
- Developed a mortgage application flow
Summary
I have worked for 10 years as a fullstack developer in the Java environment and I still enjoy getting into complex systems and new project situations. What sets me apart from other developers is my strong commitment to the project, for example by optimizing development processes or taking on responsibility for topics, the team, or the software. In addition, I work on my own and open source projects in my free time.
Skills
Backend
- Java Se
- Microservices
- Python 3
- Django
- Flask
- Rest
- Postgressql
- Sqlite3
- Sqlalchemy
- Spring (Boot) Pythonunit
- Angular 19
- Javascript
- Typescript
- Github Actions
- Docker
- Scrum
- Jpa (Hibernate)
- Playwright
- Alembic
- Google Oauth
- Google Cloud (Gcp)
- Jira
- Confluence
- Gatling
- Devsecops
- Google Cloud Logging
- Prometheus
- Google Cloud Metrics
- Ai
- Copilot
Frontend
- Gemini
- Roo
- Cline
- Angular
- Vue
- React
- Html5
- Css3
Test & Miscellaneous
- Playwright
- Cypress
- Junit
Languages
Education
University of Mannheim
Bachelor in Business Informatics · Business Informatics · Mannheim, Germany
Certifications & licenses
Oracle Certified Professional Java 17
Oracle Certified Java Ee 6 Persistence Api
Certified Kubernetes Application Developer
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