Resume

Florian Posdziech

I am a software developer, though not a computer scientist. I’m a physicist by training and musician by passion, and I’ve been working with computers my whole life. I wrote my first HTML in the 90s - also my first digital music scores - and started developing websites professionally with WordPress around 2010.

2016, while living in Mexico, I taught pyself Python, Django, and TDD in order to develop more serious web applications. I got my first paid project in 2017 and have been working in the field ever since.

I’m looking for:

• Work as a software developer - but I am open for related positions as well.
• A part-time position. For personal reasons I currently work 30 hours per week, Monday through Friday.
• Meaningful work. No stupid things like automotives, crypto currencies, “AI”, or advertising.
• An office I can commute to by bike, so anything in Mannheim and Ludwigshafen, or a fully remote team.

I like:

• Working in a team of equals where mistakes are not condemned but discussed and learned from.
• Asking stupid questions and getting them answered.
• Testing. Without tests there can be no code.

I offer:

• 8 years of experience in developing, maintaining, and running Ruby On Rails applications.
• A track record of learning new languages and frameworks on the job, and quickly becoming productive with them.
• A passion for software testing.
• The desire to do the right thing and do it right.

Last updated: March 18, 2026.

Relevant job experience

• Since September 2019: Backend Developer at ioki GmbH, Frankfurt.
  ioki offers a SaaS application for on-demand shuttle services in the public transport sector. We work with Ruby on Rails, PostgreSQL, PostGIS, and all the other fun standard stuff. My teammates are incredibly skilled, and I have learned a ton from them over the last years. Sometimes I could teach them as well, especially about writing software tests.

  Like everyone else on the team, I am not only responsible for writing new features but also for code deployments, error monitoring, dependency updates, debugging bug reports and - of course - code reviews.

  For a number of years I hosted our internal series of tech-focused lightning talks.

  Most impactful contribution: I wrote the gem/module and a DSL for efficiently implementing the diverse price systems of our customers, the public transport providers.

• May 2018 - Aug 2019: Software Developer Ruby on Rails at CHI Deutschland Cargo Handling GmbH, Frankfurt.
  Looking for a job in the Rhein-Main-Neckar area, I overlooked the requirement for Ruby skills in one job ad. I got hired me anyways and this jumpstarted my career as a Rails developer.

  Proudest achievement: I successfully replaced Jira with GitHub issues for the team’s task management.

• Jan 2017 - Dec 2017: Software Developer Python at Lexa.mx, Mexico City.
  After teaching myself the basics of web development using Python in the previous year, I got the opportunity to build the prototype for a SaaS startup from the ground up. I used Django as the framework, pythonanywhere for hosting, LaTeX for templating and typesetting documents, and I fell in love with pytest.

  This was a super interesting collaboration between lawyers, designers, and me as the developer. While the product never went anywhere, you can still find the designs in my friend Angélica Ramos’s portfolio.

  Coolest story to tell: How I tested the LaTeX templates for legal documents using pytest.

• Sep 2013 - Jul 2014: Bartender at the Ganter brewery experience, Freiburg.
  Learned to draw the perfect beer.

Education

• 2002 - 2009: Studied physics in Freiburg and Trondheim.
  Diplom / M.Sc. in physics. Thesis: Mathematical modelling of the JAK2-STAT5 signalling pathway.