Recommended expert

Frederik Claus

Freelance Fullstack Software Developer

Frederik Claus
Munich, Germany

Experience

Feb 2024 - May 2024
4 months

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

Nov 2022 - Sep 2023
11 months

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

Mar 2022 - Oct 2022
8 months

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

Jan 2020 - Mar 2022
2 years 3 months

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

Jul 2018 - Aug 2019
1 year 2 months

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

May 2017 - May 2018
1 year 1 month

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
Apr 2017 - Sep 2017
6 months

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

Nov 2014 - Nov 2016
2 years 1 month

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

German
Native
English
Advanced

Education

Oct 2009 - Jun 2013

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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