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Full-time vacancy

Senior .NET developer

We are not the only ones looking for a .NET developer! But the happiest!

As a senior .NET developer, developing, implementing and optimizing applications and websites is peanuts for you. Do you enjoy a full-time position in an informal working environment with 14 cheerful colleagues and the opportunity to work at home or at the office? Then read on quickly.

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What are you going to do?

You are not afraid of complex and challenging projects. On the contrary: it gives you energy! Whether it concerns websites, web applications, links with external systems or custom solutions, you are up to the challenge.

After a kick-off session with the client, you will be able to work out the structure of a new website or application in a clear and effective manner in wireframes. You think beyond your nose - or that of the client - and come up with innovative ideas and customized solutions. You switch quickly and you like short lines. Also within the team. Our current development team consists of two .NET and three PHP developers. As an experienced senior .NET developer you share your knowledge and learn from each other.

What do we ask of you?

  • You are an expert in .NET development
  • You have demonstrable experience with ASP.NET Core, ASP.NET MVC, C# and MSSQL
  • You have experience with npm, JavaScript, CSS Less and Sass and preferably also with Angular, React or Vue
  • You have experience with Windows Server and SQL server
  • You have a completed HBO education (in the direction of development, computer science)
  • Knowledge of Umbraco is a plus
  • You are Cheerful!

What do we offer you?

  • A full-time position
  • An enthusiastic team of approximately 14 colleagues
  • An extensive customer portfolio
  • Room for self-development
  • A salary based on knowledge and experience
  • Ability to work from home as well as in the office
  • A laptop and smartphone
  • Work from home allowance
  • Pension provision

Who are we?

We are a full service agency Vrolijk Online. Cheerful Online stands for quality, short lines, quick switching and a personal approach. With a multidisciplinary team, consisting of account and project managers, developers, designers, copywriters and online marketers, we have all disciplines under one roof. Together we strive for the best end result for every customer.


Then come and meet us. Send an email to and let us know why you are an addition to our team!


Acquisition in response to this vacancy is not appreciated.

Curious what we can do for you?

We are happy to tell you about the opportunities and possibilities.