Within the IT Delivery department, the Custom Software Services team develops custom applications to drive our core business processes. We for instance develop applications for instrument ranking, for investment portfolio rebalancing and for evaluation of investment opportunities. The team consists of 15 software engineers who have successfully developed several key applications over the last few years. Currently the team primarily delivers client/server applications in .NET. Over the last few years we see a significant increase in the demand for custom applications, together with an increase in size and complexity of the delivery projects. To meet the increase in demand the team needs to expand with additional analysts, designers, .NET developers and testers. Furthermore, changes are needed in the technology stack to move from .NET client server applications to secure APIs with a more flexible front-end (e.g. web). Experience with API design and - development is a relevant selection criterium. We are looking for a candidate for the position of "Senior Developer" for the Custom Software Services team who can help realize our ambitions. In this position, you will focus on the development of custom software. You gather requirements and translate these into innovative software solutions, and can also develop and execute (automated) tests. You are a driving force behind the transition from .NET client server applications to APIs with a more flexible front-end. Next to solid technical skills you are a team player, with strong stakeholder management skills. The right candidate has 5-7 years relevant experience with requirements software design and software development. Experience in an asset management environment is a pre. You have excellent communication skills, and can handle pressure from business and IT stakeholders. You can establish yourself as a trusted consultant and advisor. You can deliver results and achieve objectives, both autonomous and in a team setting. You are a strong team player. Knowledge and experience Bachelor education and work level; Aware of the most recent software development techniques; Experience in managing your own work as well as a small project team; 5-7 years relevant work experience in .NET development; Experience with designing, building and testing of data intensive applications; Experience with designing and delivering online services for end users; Experience in Azure, MuleSoft, API's and Web; Experience in Scrum and Agile working; Experience in automated testing; Experience in DevOps, Continuous Development and Continuous Integration; Strong communication and social skills; Proficient in the Dutch as well as English language (written and spoken); Result- and customer oriented with a focus on high quality results;.