My work experience (CV)

Freelance Frontend Developer & Engineering Manager · 19 years of experience

I’m a freelancer, helping companies with my Frontend expertise, Engineering and Agile workflow optimization.

Profile

I’m a freelancer helping companies with frontend development, engineering management, and agile workflows.

Berufserfahrung

Anselm Hannemann Web Development December 2011 – Present (14 years)

Freelance frontend developer & agile coach

  • Consultancy of customers
  • Various small website projects
Fiberfone January 2026 – March 2026 (3 months)

Fullstack development co-lead

Building an internal geolocation database service and internal dashboards for the company’s products and services. Focus is on building fast (using LLM/AI support) and scalable solutions for a complex application in a small team while caring about robust and secure implementation of code.

Jedox January 2025 – July 2025 (7 months)

Accessibility lead & frontend engineer

Helping the teams with their frontend libraries, a unified component library, and transitioning old external solutions into modern internal projects. I also kicked off the accessibility compliance project for the first product and coached developers and QA people about the topic.

Testo April 2023 – December 2024 (1 year)

Scrum master / effectiveness coach

Helping the Data Engineering team to be more effective building AI and various API products in time.

Testo November 2022 – March 2023 (5 months)

Frontend architecture and frontend engineer

Organizing and building the architecture, technology and workflow base for a new web application serving a global customer portal and connecting various products and APIs together.

Siedle August 2022 – February 2023 (7 months)

Frontend lead developer

Refactoring an existing codebase into a modern, reliable, and high-performance codebase to solve ongoing performance problems with the web application that’s used in the fields by thousands of customers. We achieved a lean and robust solution that’s seamless to use and has no performance issues anymore.

Colloq May 2017 – April 2021 (4 years)

Co-founder and developer

An event management and knowledge discovery platform. As a team of three, we founded and created a social event platform from scratch. After four years, we shut down the project due to lack of market relevance.

LaterPay January 2019 – March 2020 (1 year)

Engineering & delivery management

I helped two teams building the right things that are valuable for the customers, prioritized the work and coached people these skills so they can do it on their own. As Engineering Manager I made sure that people are well, can work in a safe work environment and at the same time evolve their career and learn new skills. This included hiring people and helping the HR department in their decisions.

LaterPay December 2014 – March 2020 (5 years)

Front-end consultancy & development

I refactored a lot of legacy code and built new, fast and scalable codebases with modern toolchains in a set of three teams. This included coaching junior developers and regularly auditing other codebases for performance, scalability, accessibility problems.

Adverma agency January 2018 – May 2019 (1 year)

Front-end architecture and development

I helped building two websites that serve millions of customers and data with a lean tech stack in the background. This included a lot of hand-crafted code and smart decisions to solve certain problems that come with such projects. I was responsible for the frontend part and the overall technical customer experience.

Greenpeace International November 2016 – May 2017 (7 months)

Front-end development

In a small team we’ve done the architecture of the international set of websites for the organisation. This meant a styleguide and custom tech framework on a Wordpress Multi-Site basis, using Scrum as work methodology. I was responsible for the frontend guidelines and codebase.

Sahana Disaster Management Foundation April 2016 – August 2016 (5 months)

Front-end prototype development

Wireframe and front-end prototype development for the Sahana Disaster Management Foundation.

Vaillant Group January 2014 – October 2014 (10 months)

Front-end developer

I was hired for building a global website system that scales and lasts within a small team. Quickly, we grew to 45 people and I together with a colleague was responsible for the frontend stack and coordination of the project as well as supervising two of four Scrum teams. In parallel, I build many of the frontend components, test framework and infrastructure with my team. The big part of the project was finished within one year, a perfect example of well working teams and a well organized project.

SAP Datacenter December 2012 – May 2013 (6 months)

Front-end architecture and development

Front-end architecture and development for the SAP Datacenter website in partnership with Hans-Christian Reinl and grasundsterne agency.

FOCUS Magazin / Hubert Burda Media January 2012 – July 2013 (1 year)

Front-end development

Front-end development and tablet applications using brand new web technologies. As ambassador of Adobe and expert for other big tech companies working on web standards, I was one of the first using the new HTML5 and CSS3 features in real life.

2issue digital publishing GmbH March 2011 – January 2014 (2 years)

Freelance advisor and director

Architecting and building digital magazines, apps and web experiences for clients like FOCUS Magazin, Adobe, and more.

Design agency (own) November 2007 – December 2011 (4 years)

Founder

We built corporate designs, websites and did consultancy work for a variety of people and companies successfully. After four years, my business partner switched jobs and this business was split up and transformed into my sole freelance business in 2011.