.NET Developer (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 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! 🏆

We are currently looking for a talented .NET Developer (Freelance) to join our dynamic team and work on high-impact projects for one of our major clients.

Position Overview

• Status: Freelance

• Location: Brussels, Belgium (Hybrid model: 2-3 days of remote work per week)

Your Responsibilities
As a .NET Developer, your daily missions will include:

• Designing and developing robust, scalable, and high-performance applications and APIs using C# and .NET (Core / 6+).

• Building and maintaining RESTful APIs and microservices with ASP.NET Core.

• Ensuring code quality through rigorous testing (unit, integration) and CI/CD pipelines (Azure DevOps, GitHub Actions).

• Collaborating closely with Frontend Developers, Product Owners, and DevOps engineers to deliver seamless digital solutions.

• Optimizing applications for performance, security, and scalability.

• Troubleshooting and debugging production issues to maintain high system availability.

• (For Senior profiles) Mentoring junior team members, driving technical architecture decisions, and championing best development practices.

Profile & Technical Skills

• Strong experience in C# and the .NET ecosystem (.NET Core / .NET 6+, ASP.NET Core, Entity Framework).

• Solid understanding of relational and non-relational databases (e.g., SQL Server, PostgreSQL, Cosmos DB).

• Familiarity with RESTful APIs, microservices architecture, and design patterns (SOLID, Clean Architecture, DDD).

• Experience with Azure (App Services, Functions, Service Bus) and containerization (Docker, Kubernetes) is a strong asset.

• Good understanding of Git, CI/CD tools, and agile methodologies (Scrum/Kanban).

• Excellent problem-solving skills and a strong team spirit.

• Language: Professional fluency in English. Knowledge of French or Dutch is a plus.

Why Smile?

• Proximity Management: Our management by peers fosters open dialogue and the implementation of a tailored career path.

• Continuous Learning: 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, and knowledge-sharing tools.

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

🚀 The Next Steps

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

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

3. Business Interview: A discussion with one of our experts to assess your technical skills and define your goals.