Senior Software Engineer-C#

Undisclosed salary
Rotterdam, Netherlands
Back-end | C# / .NET
4 days
Work in office


Mendix is on a mission to enable anyone in any organization – from the marketing coordinator to the software developer to the CEO – to create things that are transformational for their company.  We are fundamentally reinventing the way applications are created and we’re reinventing the future of software development.  Sounds ambitious, right?  We agree.

Not to brag, but nearly 4,000 organizations worldwide, including KLM, Medtronic, Merck, and Philips, rely on Mendix to build web and mobile applications.  Thousands of our customers use our platform to delight their clients and empower their employees. It’s no surprise that we’re a recognized Leader by Gartner and Forrester in a red-hot market expected to exceed $21 billion by 2022.  Ok, maybe we did want to brag a little.  But we’re proud of what we’ve accomplished…and…we’re humble enough to admit that we need you to make us even more effective.

We help companies innovate. We solve complex software engineering challenges so our customers don’t have to. Using the Mendix platform companies can build digital solutions that are easier to create, comprehend, run, maintain and extend.

Do you get excited about compilers, domain specific languages and abstractions? So do we! We are looking for someone that can quickly see through complex technical challenges and work with the team to solve them in an elegant way.

The team takes ownership for delivering and supporting robust solutions that our users love to work with. You will shape the core of our development environments for the Mendix platform. Your work will help our customers create better solutions. We allow them to focus on the complexity of their business challenge instead of the technical challenges.


Have a proven track record of software engineering and being able to solve complex challenges

Enjoy solving those challenges by understanding them by deconstructing them into elegant, understandable code

Are able to break challenges down to iteratively build the solution with short feedback cycles

Are proficient in C# and have knowledge of one or more other programming languages

Have a good understanding of core concepts of computer science and apply them regularly

Are persistently curious and have strong analytical skills that help you ask great questions to identify possible issues with the requirements and help you to define the actual problem

Are always learning and innovating in your work by staying up-to-date in your field and learning from others

Will dive deep into existing functionality to identify risks and test cases to ensure existing mechanisms still work when introducing new core functionality

Like working in a team instead of working in isolation

Like to learn from others and coach and mentor to help others be successful

Take responsibility for the quality of your work by identifying risks and testing it

Experience with the following is required:

  • You have done several large scale projects using C#
  • Version control systems, preferably GIT and Subversion
  • Build tools like Jenkins and Bamboo and processes like continuous integration and deployment.

Experience with the following is a plus:

  • Building Mendix applications
  • Metamodeling, compiler technology and code generation

Our Guiding Principles

While we live on different continents, speak different languages, and work on different things, we are bound by our “MendixBlue” guiding principles.  Being “MendixBlue” means that you live the culture, and you consistently improve it as we grow.  It’s kind of a big deal.

We put the customer first.  Without our customers, we have no business.  So, if you act in the best interest of our customers, always…you belong here.

We think big. We work to have a meaningful, lasting impact on the world.  So, if you aim high and think long term…you belong here.

We innovate.  We want to be what happens next.  So, if you ask “what if?” and work to find a way or make one…you belong here. 

We nurture talent.  We look, not just at the sum of what an individual has done, but at the potential of who they can be.  So, if you’re up for learning from your failures…you belong here.

We hear every voice.  Inflated egos don’t last here, humility does.  So, if you share credit and ensure that the best ideas win – regardless of who they come from…you belong here.

We own it.  If something needs doing, we do it. So, if you focus on the outcome, and take initiative to get it done…you belong here.

We have fun.  We use laughter as a common language.  We can ask for help and we’re happy to give it.  So, if you find joy and purpose in what you do…you belong here.

Make your career at Mendix.

There are precious few jobs that let you create the future. But you’ll find one at Mendix. We are at a pivotal time in our company’s existence: where rapid growth meets stable funding.  This is the time for industrious people to raise their hands to solve the next generation of problems. Mendix is a place where ambitious people can thrive; where you can identify an issue, propose a solution, and build the structure to make it happen.

Important to know: Mendix is a Siemens business, which means we’re backed by the resources and stability of one of the world’s largest and most forward-looking enterprises. Think: job security.

Since our company was founded in 2005, our aim has been to create a great work environment for people at all stages in their careers. That’s why we are so pleased and honored that we were rated a top Cloud Computing Company to work for in 2019, based on feedback from our employees on Glassdoor. With offices in the Netherlands, the UK, Germany, and the US, (and more coming), we provide an international playground to truly impact the world through low-code.

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