ASP.NET MVC C# /.NET Developer

We’re looking for a Medior C# /.NET Developer to strengthen our Web Team’s ongoing digital evolution. You have mastered the .NET ecosystem and built scalable, reliable, and user-centric web platforms.

How do you help make a difference?

Your first expertise in backend development, API integration, and modern engineering practices will help us accelerate our web initiatives and deliver high-quality, seamless digital experiences. Additional experience with content management systems (CMS) is a strong plus.

What is your role at Ypto?

As a C#/.NET Developer you will take on the following responsibilities:

• Backend Development Leadership: Contribute to the development of our .NET applications by delivering reliable backend services and APIs, and collaborate with the team to ensure high‑quality technical implementation.

• Performance & Reliability: Help monitor and improve backend performance by identifying issues, suggesting optimizations, and implementing improvements to support reliability and stability.

• API & System Integration: Collaborate closely with frontend, architecture, and integration teams to deliver smooth, real-time data flows across systems.

• Technical Implementation Excellence: Translate technical requirements into clean, efficient, and scalable code, while helping define coding standards and best practices for the team.

• Testing & Quality Assurance: Ensure high quality through automated testing, code reviews, and continuous integration practices. Support the team in building secure and maintainable solutions.

• Continuous Improvement: Stay ahead of the latest trends in .NET and backend engineering, helping the team adopt new technologies, frameworks, and methodologies.

• Communication & Mentorship Communicate clearly with team members, share progress and risks proactively, and participate in code reviews and knowledge sharing to support a collaborative team culture.

You have 3 to 5 years of hands-on experience in C# /.NET backend development

You also possess these technical skills:

• You have strong command of .NET 6+, .NET Core, Web API, and RESTful services

• You have experience with relational databases (SQL Server) and ORM frameworks (EF Core)

• You have additional experience with CMS platforms (e.g., Sitecore, Umbraco, Optimizely) - nice-to-have

• You have solid understanding of application architecture, design patterns, and modern development principles

• You have hands-on experience with CI/CD pipelines and version control (Git)

• You have strong grasp of performance optimization and troubleshooting techniques

• You have experience providing L2/L3 support in a production environment

And these soft skills:

• Solid grounding in Agile methodologies and iterative delivery

• Ability to collaborate with cross-functional teams and contribute to a positive, learning-focused team culture

• Strong multitasking abilities and adaptability to dynamic work environments

Communication

• Excellent communication skills, capable of explaining complex topics clearly

• Proficiency in Dutch or French + English is required

Additional

• This role may require flexible availability outside of working hours at specific points in time (such as system go‑lives)

Everyone is unique. That's why we believe it’s important that you can be yourself — it makes Ypto/SNCB stronger. We therefore place great value on diversity and inclusion.

What can you expect from us?

Choosing Ypto/SNCB means choosing to contribute to the digital transformation of the Belgian railways. You will have a job with social impact and ample opportunity to make your own contribution. Alongside a healthy work-life balance and a competitive salary, we offer:

• the possibility to work remotely + flexible working hours;

• 35 days of leave;

• a company car + a public transport season ticket;

• a target bonus;

• a comprehensive insurance package (affiliation without own contribution, excl. outpatient costs for family members);

  • hospitalisation and dental care for the whole family;

  • outpatient costs (= medical costs separate from hospitalisation);

  • group insurance: supplementary pension, work disability (cafeteria plan);

  • accidents at work (extralegal);

• meal vouchers and eco-vouchers;

• net allowances for remote working and carwash + internet budget.

Where will you be working?

You will work near Brussels-South station and join the Commercial Channels & Products team.

What’s next?

1. You apply online.

1. We take a close look at your CV and check whether it matches the profile you are looking for. We may call you briefly to ask about your motivation and experience.

1. We invite you for a first (online) HR interview where you can demonstrate your motivation, experience and expectations.

1. If the first interview is positive, we invite you for a second technical interview in Brussels. This interview will be with the team, where we’ll discuss the role and how your skills align with the team’s needs.

1. If everything goes well, we will make you a contract offer.

1. You start your new job!

We reserve the right to adjust or pause this procedure if necessary. Our recruitment team will select the profiles that best match the job requirements to ensure an optimal fit.