I am a product builder and software developer working in Berlin and remotely. I help startups turn their product ideas into working software and enjoy hands-on software development. I am interested in freelance consulting and long term product development gigs.

I currently work as a freelance startup tech advisor. You can read more about what I’m up to on my blog.


You can hire in any of these areas:

  • Engineering leader / CTO: You need an experienced engineering manager to get you started or to get your product back on track.
  • Product workshops: You have a product idea and need guidance how it can be turned into working software or apps.
  • Tech due diligence: You need a second opinion about the technical foundations of a product or a startup.

For this I bring 20 years of professional IT experience with a focus on agile development, product building, growing and managing engineering teams, internet applications, e-commerce, logistics, marketplace platforms, mobile apps, databases, scaling and performance optimization, remote work, content management and IT-infastructures.

Project Portfolio



At mTOMADY we are building a digital healthcare infrastructure platform that enable affordable access to healthcare in developing countries in sub-saharan Africa.

Our platform connects patients with hospitals and healthcare sponsors and provides protected healthcares savings and secure payment through mobile wallets.



I was brought in to design and build a same day delivery logistics platform. The solution had to work as a drop-in replacement for an existing legacy solution. Over 6 years we went from ideation to first working software to growing an internal engineering team and eventually to an aquisition and break-even. Make sure to pick Liefery as a delivery option when ordering online for ultra-fast and extra-convenient deliveries.



I joined Papersmart in 2011 as co-founder, CTO and hands-on developer. We built a full custom e-commerce marketplace in Rails from scratch with many unique features like a shopping cart based price comparison, automatic detection of equivalent products and splitting orders between vendors to save more money. The site is optimized for speedy user interaction and has many features you would like to see in most e-commerce sites as our customer reviews showed.



I joined BizSphere AG as a co-founder and first developer in 2006, responsible for shipping an ambitious product idea to a global enterprise customer within a few months. Soon after that I was onboarding and coordinating developers located across 12 timezones, negotiating requirements with enterprise IT-departments while writing code in Java and Rails and automating infrastructure deployments in the cloud.

Freelance Projects

Other freelance projects include:

  • Customer service website backend for O2 Germany
  • Core banking system for DiBa Austria
  • Mortgage consulting application for Sparkasse Germany
  • An AJAX-style project management application for Compaq in 1999 (Yes AJAX in 1999! Think single page app in IE4 without XMLHttpRequest and a JSON-y data protocol before JSON existed)

What people who work with me say

There were several traits of Simon that impressed me from the start and that I grew to rely on over the years. First of all, Simon has an immense competence in enterprise java, frameworks… short: he was the master of our entire software backend. As a colleague, I valued his reliability and willingness to help out and be a team player. Being very organized and proactive at the same time, he was a constant driver of improvement in our organization.

Not only did we trust fully in his reliability and integrity as a colleage and co-founder, but we also elected him into our supervisory board where he represented the founder team for many years.

Stefan Broda, co-founder @bizsphere.com

Simon is a very driven and motivated professional. As project and requirements manager you could always count on him, swiftly solving issues, regularly communicating with the client and maintaining a good morale amongst his team members.

Andres Nerlich, colleague @o2 and @bizsphere.com

You can also find me on:

Please email me if you are interested in working with me.