Frederik Claus - Freelance Fullstack Software Developer

Q: Where is Frederik based?

Frederik is based in Munich, Germany .

Q: What languages does Frederik speak?

Frederik speaks the following languages: German (Native), English (Advanced) .

Q: How many years of experience does Frederik have?

Frederik has at least 8 years of experience. During this time, Frederik has worked in at least 1 role and for 7 different companies . The average length of individual experience is 1 year . Note that Frederik may not have shared all experience and actually has more experience.

Q: What is Frederik's latest experience?

Frederik's most recent position is Freelance Fullstack Software Developer at Bundesdruckerei GmbH .

Q: What companies has Frederik worked for in recent years?

In recent years, Frederik has worked for Bundesdruckerei GmbH , Zeppelin Baumaschinen GmbH , and AKDB (Anstalt für kommunale Datenverarbeitung) .

Q: Which industries is Frederik most experienced in?

Frederik is most experienced in industries like Information Technology (IT) , Government and Public Administration , and Banking and Finance . Frederik also has some experience in Real Estate , Healthcare , and Automotive .

Q: Which business areas is Frederik most experienced in?

Frederik is most experienced in business areas like Information Technology (IT) , Product Development , and Quality Assurance (QA) .

Q: Which industries has Frederik worked in recently?

Frederik has recently worked in industries like Government and Public Administration , Information Technology (IT) , and Healthcare .

Q: Which business areas has Frederik worked in recently?

Frederik has recently worked in business areas like Information Technology (IT) , Quality Assurance (QA) , and Product Development .

Recommended expert

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

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (3 years), Government and Administration (2.5 years), Banking and Finance (2 years), Real Estate (2 years), Healthcare (1 year), and Automotive (1 year).

Information Technology

Government and Administration

Banking and Finance

Real Estate

Healthcare

Automotive

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (8 years), Product Development (7 years), and Quality Assurance (6 years).

Information Technology

Product Development

Quality Assurance

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

Profile

Created

September 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Frederik based?

Frederik is based in Munich, Germany.

What languages does Frederik speak?

Frederik speaks the following languages: German (Native), English (Advanced).

How many years of experience does Frederik have?

Frederik has at least 8 years of experience. During this time, Frederik has worked in at least 1 role and for 7 different companies. The average length of individual experience is 1 year. Note that Frederik may not have shared all experience and actually has more experience.

What roles would Frederik be best suited for?

Based on recent experience, Frederik would be well-suited for roles such as: Freelance Fullstack Software Developer.

What is Frederik's latest experience?

Frederik's most recent position is Freelance Fullstack Software Developer at Bundesdruckerei GmbH.

What companies has Frederik worked for in recent years?

In recent years, Frederik has worked for Bundesdruckerei GmbH, Zeppelin Baumaschinen GmbH, and AKDB (Anstalt für kommunale Datenverarbeitung).

Which industries is Frederik most experienced in?

Frederik is most experienced in industries like Information Technology (IT), Government and Public Administration, and Banking and Finance. Frederik also has some experience in Real Estate, Healthcare, and Automotive.

Which business areas is Frederik most experienced in?

Frederik is most experienced in business areas like Information Technology (IT), Product Development, and Quality Assurance (QA).

Which industries has Frederik worked in recently?

Frederik has recently worked in industries like Government and Public Administration, Information Technology (IT), and Healthcare.

Which business areas has Frederik worked in recently?

Frederik has recently worked in business areas like Information Technology (IT), Quality Assurance (QA), and Product Development.

What is Frederik's education?

Frederik holds a Bachelor in Business Informatics from University of Mannheim.

Does Frederik have any certificates?

Frederik has 3 certificates. These include: Oracle Certified Professional Java 17, Oracle Certified Java Ee 6 Persistence Api, and Certified Kubernetes Application Developer.

What is the availability of Frederik?

Frederik is immediately available for suitable projects.

What is the rate of Frederik?

Frederik's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.