.NET Developer (Permanent contract and Freelance)

Passionate about tech, digital, and innovation? Join the 1,800 employees at Smile, the European leader in open-source integration, spread across 20 agencies in 9 countries. Collaborative spirit and knowledge sharing are at the heart of our DNA. Our experts push the boundaries of open source every day to build a smarter, more efficient, and more responsible digital world. Here, we don't just follow trends, we create them! Join Smile in Brussels and take part in projects that truly matter!

As a .NET Developer...

You are the architect of performance and the driving force behind our clients' web applications! Based in our vibrant Brussels agency, your mission is to design, develop, and optimize robust and scalable custom solutions using the modern Microsoft .NET ecosystem. On a daily basis, you will:

• Design and develop complex, high-performance web applications using C# and the .NET Core / .NET 8 framework.

• Build and integrate secure, robust RESTful APIs and microservices.

• Collaborate closely with front-end developers, product owners, and architects to ensure seamless integration and an optimal user experience.

• Ensure code quality by writing unit and integration tests, and actively participating in code reviews to maintain high standards.

• Optimize application performance, manage databases (SQL), and troubleshoot technical issues in diverse environments.

• Participate in Agile ceremonies (Scrum) and contribute to the continuous improvement of our development and deployment practices (CI/CD).

Your profile

Holding a degree in IT, computer science, or engineering, you have at least 3 years of hands-on experience as a .NET Developer , ideally within an Agile environment.

• You have a strong mastery of C#, ASP.NET Core , and related ecosystem tools (Entity Framework, LINQ).

• You are comfortable with relational databases (SQL Server, PostgreSQL) and have a good understanding of cloud environments (Azure is a strong plus).

• You are familiar with modern development practices and are passionate about clean code , applying SOLID principles, and design patterns rigorously.

• You have an interest in or basic knowledge of modern front-end JavaScript frameworks (Angular, React, or Vue.js).

• Your team spirit , curiosity, and fluency in English (French or Dutch is a great asset in Brussels) make you an ideal collaborator to tackle our technical challenges.

Ready to take on a new challenge in the heart of Europe? Come and express your talent in a caring environment at Smile Brussels where your ideas will make a real impact!

Why Smile!

Our proximity management by peers fosters dialogue and the implementation of a tailored career path.

Because the digital sector is in constant motion, Smile is committed to making you an expert in your field , thanks to a comprehensive training offer: access to an e-learning platform, financing of certifications, knowledge-sharing tools...

Your year will be animated by group and agency events : annual convention, participation in trade fairs, summer party, formal & informal afterworks.

The next steps

• First contact: A phone call to discuss your aspirations and what we can offer you.

• Meeting: An opportunity to get to know each other and explore your professional background.

• Business interview: A discussion with one of our experts to assess your skills and define your goals.

Welcome to the team! And if it's a match between us, we will be delighted to welcome you for an exciting adventure. So, ready to join the team?