Work With Me

What You Want (And What I  Offer):  Client Oriented Testing

You and your team build software and you’re looking for someone who can help you with software testing. Preferably one who likes to share his knowledge and who’s ultimate goal is to make himself superfluous. The whole approach to testing depends on what kind of information you need to make your business decisions. Some questions are:

  • Does the software meet given requirements/specifications?
  • What are the risks of releasing (or not releasing) the software?
  • How can we deploy continuously to our production system?

Depending on what exactly you need to know, the strategy, design and execution varies a LOT.
I help you to find the right questions for your business as well as set up a special tailored test approach for your product (or project).

As I wrote in “Testing And The Two Values of Software

Also, I definitely want my clients, as well as their clients, to be happy with the software I help to develop, not only today […].

And I mean it. I do believe great software is possible.

I’m available for contracting, coaching and training.
Contact me at

To help you figure out how I can help you, here are some examples of my work — be sure to check out the blogposts, too.


Agile Testing Fellowship

Agile Testing Fellowship

I’m an Agile Testing Fellow. As the web site of the fellowship explains, we are ‘a community of practitioners forging new frontiers in agile testing.’

Books and Contributions

I am the author of Fast Feedback Using Ruby:

Fast Feedback Using Ruby

I contributed to “More Agile Testing” (Lisa Crispin, Janet Gregory); see Chapter 23, “Testing and DevOps”.
This is a description of testing your infrastructure in a DevOps team.

I also contributed the German translation of ‘Quick Tools for Agile Testing‘ (‘Prinzipien für Agiles Testen – 10 Prinzipien für Agiles Testen’).

A Selection of Bug Reports

Bug reports are one work product of testers. Here are some links to bugs I reported:

Some Code

Here’s some code I wrote:

It’s a Ruby gem that helps to detect whether or not criteria are met for at least or at most a given number of elements in a collection.

What People on Say about the Feedback I Give

Testimonials from users whose Ruby code I reviewed

Same as text:

  • Extraordinary feedback guided me by giving insights about paradigms that I could use
  • He explains and guides you throughout the solutions’ iterations.
  • Great advice to help me clean up what I thought was a good simple approach for an even better one.
  • Great tip on reading about what the Max method can do. Helped to reduce the wording my code and make it simpler. I’m all for simpler!
  • Quickly helped me get to the most terse (and readable) iteration.
  • Great help by s2k, understand much more now!
  • Clear and helpful comments, with good hints that helped me search for best methods.
  • Very good feedback. Found an issue I didn’t see and provided a way to write the code better using one of Ruby’s own built in method.
  • Really helpful comments and nice motivating tone
  • Very good at helping students find an optimal solution with many constructive advices.
  • Helpful critical feedback, kindly offered =)


If you prefer that, here’s a more classical view in form of a PDF file.

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