Novancy, a leading staffing and recruitment firm specializing in Information Technology and Digital Transformation, is seeking a Senior C# ASP.NET Core Developer to support a client in the temporary work and payroll industry. This long‑term freelance position is remote, allowing the developer to work from anywhere while collaborating closely with the client’s local team.

Key Responsibilities

• Design, develop, and maintain high‑quality, scalable applications using C# and ASP.NET Core 8.
• Implement asynchronous programming patterns, generics, and design patterns to enhance code maintainability and performance.
• Leverage Entity Framework Core to create efficient data access layers, optimizing LINQ and SQL queries for PostgreSQL.
• Design and refine data models to support complex business logic and large‑scale data processing.
• Develop comprehensive unit tests using xUnit and Moq to ensure code reliability and facilitate continuous integration.
• Collaborate with cross‑functional teams to translate business requirements into technical solutions, focusing on the payroll and temporary work domain.
• Analyze and troubleshoot performance bottlenecks, applying profiling and optimization techniques.
• Document architecture decisions, coding standards, and best practices for future maintenance.

Required Skills

• Proficiency in C# and ASP.NET Core 8.
• Strong knowledge of asynchronous programming, generics, and design patterns.
• Expertise with Entity Framework Core and performance tuning of LINQ/SQL queries.
• Experience with PostgreSQL data modeling and optimization.
• Solid understanding of unit testing frameworks such as xUnit and Moq.
• Ability to design scalable, maintainable architectures for large‑scale applications.
• Excellent analytical and problem‑solving abilities.
• Knowledge of the temporary work/payroll industry is a plus.
• Self‑sufficient, responsible, and capable of working independently.
• Fluency in French (required).

What We Offer

• Long‑term freelance engagement with competitive compensation.
• Opportunity to work on challenging projects in a dynamic industry.
• Collaborative environment with experienced professionals.
• Remote work flexibility.

To apply, please submit your résumé and cover letter through Novancy’s recruitment portal. We look forward to reviewing your application and discussing how your expertise can contribute to our client’s success.