My name is Torsten Mangner. I am a software developer and quality expert.

I am very interested in getting to know you and your project. Maybe there is a chance that I can support you. If you are also interested in a collaboration or want to know more about me and my recent work, feel free to contact me

Who am I?

I like to be called a generalist and was able to gain experience in software development over the last 20 years. Since I am used to switching roles between developer, tester, and coach, I tend to rapidly become a real enrichment for every cross-functional team.

As an experienced software developer with a strong focus on quality, I aim for sharing my knowledge and experiences with my team colleagues. I do that by setting a good example and showing during my daily work how to:

For a couple of years I feel like a part of the functional programming community, but also had the chance to gain a lot of experience with “classical” paradigms. As a polyglot developer, I look into new languages and concepts every now and then and try to recognize and leverage their unique strengths. I have written production code in TypeScript, Clojure, Ruby and Go, just to name the most recent used languages.

Whenever I am in a project for a longer time, I tend to establish communities of practice (e.g. software craft, testing) with colleagues of mine, to encourage knowledge exchange between different teams or even companies. Additionally, I regularly visit meetups and conferences (both as a speaker and an attendee) to see further than the end of my own nose.

To be able to successfully bring our ideas of modern software development into the world, I founded a company named inoxio Quality Services GmbH together with two friends in 2007. Since then countless projects all over Germany and Europe utilized our know-how in the fields of development, testing, and operations.

What have I done?

If you need a traditional CV with a list of all my skills, known languages or tools and all projects that I worked on, you can find that here: Profile Torsten Mangner.

What do I believe?

In case that your beliefs do not match mine, we should definitely have a word. I would love to hear which principles are making your projects successful.

There is no silver bullet

There are no best practices. No single technology can be the answer to an existing problem. Each challenge has to be seen in the context of the current circumstances.

Continuous Improvement

1.01 ^ 365 = 37.78 
0.99 ^ 365 =  0.02

Only if a team wants to improve itself every single day, it can achieve great things. Retrospectives with their blameless causal investigation are cornerstones for the continuous improvement of a team. Small experiments with measurable results help to adapt the team’s structure and mode of operation to its current needs.


You don’t need testers to ensure quality. Every team member can learn and internalize the critical thinking of a tester and so influence the quality of the product right from the start. You may need quality advocates to accompany and guide the team in this process.


Believing is not knowing. Only with correctly measured data, one can make informed decisions. Everything else is guessing. The transparency of a product can be improved with a comprehensive monitoring solution.

In the same way can tests, with their ability to verify and document essential aspects, deliver a clearer picture of internal processes of a system.

Test pyramid

Too many tests on the wrong level of the test pyramid make your tests slow, unstable, unnecessarily complicated, and hard to maintain. In the same time, you lose the biggest advantage of a good test suite: your ability to make changes with confidence.

A nicely balanced test pyramid, on the other hand, gives you fast feedback, shows which change led to unwanted side effects and verifies both the correctness of single components and their proper interaction.

What are former colleagues saying?

I was lucky enough to have worked with Torsten for nearly 2 years. Throughout that time Torsten always impressed me with his attitude, his kindness and his intelligence. A true engineer that you can share a beer with.

John Yorke Tech Lead @ Drest Ltd

Torsten ist nicht nur ein Qualitätsexperte mit einem fast schon unheimlichen Gespühr für Bugs und ein erfahrener Entwickler, sondern kennt sich auch noch mit UX aus.

Eine IT-Allzweckwaffe also. Das meint er mit “recht erfahren” 😏.

Hire him & thank me later.

Carl Düvel Freelance Senior Software Engineer

Torsten ist in meiner persönlichen Top 10 Liste der Leute mit denen ich Software entwickeln will.

Und er versteht auch noch was von Fussball!

Christoph Burgmer Tech Lead @ Thoughtworks

Our fabulous DevQaOps and creator of beautiful things

Christian Stamm Tech Lead and Principal Developer @ OTTO

Torsten is an extremely lovely person that I had the pleasure of working with in Hamburg.

If you need a top dev talent he’s your man, and he’s also reasonably proficient at FIFA on the Playstation. Given the chance I would love to work with him again.

Richard Filippi Tech Lead @ Thoughtworks

Contact me