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Nationale-Nederlanden

Senior Full Stack.NET Developer (Freelance)

Nationale-Nederlanden
Netherlands · Full-time · Mid-Senior

NN Life & Pensions is investing quite heavily at automating the processes of financial reporting. A .NET web application is being developed to orchestrate the work across various backend systems and databases. Because of an additional project, the development team needs extra capacity for a period of approximately 9 months starting as soon as possible.

What you are going to do

As Senior Full Stack .NET Developer, you will be working at a web application to automate the processes of financial reporting. In this role, you will be responsible for building the front end system, back end system and databases (MS SQL). You will also work at underlying systems that need to expose functionality to the main orchestrator using Web APIs. Understanding the business requirements and translating them in state-of-the-art IT solutions will make you successful in this role. It goes without saying that non-functional requirements such as performance, maintainability and security will have your attention too. The application is deployed automatically, so the ability to maintain deployment pipelines is also needed in this role.

What we offer you

Our people are the driving force behind our organisation. We value the knowledge and expertise you bring. We believe that your temporary commitment can take our organization to a higher level. We offer you:

  • Competitive hourly rate depending on your knowledge and experience
  • Startdate as soon as possible for at least 8 months
  • Hybrid way of working, party from home and partly from the office
  • International working environment with loads of knowledge sharing

Who you are

As Senior Full Stack .NET Developer you have a diverse set of skills:

  • Academic background in computer science or similar
  • Several years of development experience in .NET 8 and MS SQL Server
  • Hands-on and proven experience in
  • Backend: C#, ASP.NET Core (MVC & Web APIs), Entity Framework Core, Dapper, SignalR
  • Frontend: TypeScript, React, Bootstrap 5, Webpack, HTML, CSS
  • Data: SQL Server, REST APIs
  • DevOps: Azure DevOps (Pipelines, Repos, Boards), Git, PowerShell, Azure Bicep/ARM templates
  • Azure: Application Insights, Key Vault, Log Analytics
  • Ability to write clean, maintainable code with proper unit tests (xUnit, FluentAssertions) and integration tests
  • Excellent communication skills and fluency in English, our business language

Who you will work with

A mixed of different knowledge and skills are needed to deliver a great product. You will work in a small DevOps team with a product owner, other developers and subject matter experts on the finance domain. A mixture of different nationalities and seniorities makes sure that everybody can feel at home and perform at his or her best. Our working language is English.

Any questions?

Do you have any questions about the job or the procedure? Please contact Nina Moekotte, [email protected]. Are you unsure whether you meet the criteria 100%? We would like to encourage you to apply anyway. We are curious about your unique qualities!

We bieden je

  • NS Business card, ook privé te gebruiken
  • 27 vakantiedagen en 1 Diversiteitsdag
  • 13e maand en vakantiegeld
  • Hybride werken

Key Skills

Ranked by relevance

sql devops product owner typescript sql server powershell bootstrap webpack server react vault git c
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Posted
Mar 13, 2026
Type
Full-time
Level
Mid-Senior
Location
Rotterdam

Industries

Financial Services

Categories

Engineering Information Technology

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