Novancy, a leading staffing and recruitment specialist in Information Systems and Digital Transformation, invites applications for a Freelance Senior C# ASP.NET Core Developer. This position is based remotely, with the possibility of long‑term engagement, and is tailored for professionals who thrive in dynamic, high‑impact environments.

Key Responsibilities

• Design, develop, and maintain robust web applications using C# and ASP.NET Core 8, ensuring clean architecture and adherence to best practices.
• Implement asynchronous programming patterns, generics, and design patterns to enhance code quality and maintainability.
• Leverage Entity Framework Core for efficient data access, optimizing LINQ and SQL queries for performance.
• Model and manage data using PostgreSQL, ensuring scalability and reliability.
• Develop comprehensive unit tests with xUnit and Moq, driving a culture of test‑driven development.
• Collaborate with cross‑functional teams to translate complex business rules related to payroll and temporary work into technical solutions.
• Analyze performance bottlenecks and propose architectural improvements for large‑scale applications.
• Document technical designs, API contracts, and deployment procedures.

Required Qualifications

• Proven expertise in C# and ASP.NET Core 8.
• Deep knowledge of Entity Framework Core and performance optimization techniques.
• Strong experience with PostgreSQL and database design.
• Proficiency in unit testing frameworks such as xUnit and Moq.
• Demonstrated ability to design scalable, high‑performance systems.
• Excellent analytical and problem‑solving skills.
• Experience or familiarity with the payroll and temporary work industry is a significant plus.
• Self‑sufficient, responsible, and capable of working independently.

Language Requirements

• Fluency in French is mandatory; English proficiency is a plus.

Contract Details

• Type: Freelance (Long‑Term Contract)
• Location: Remote (hybrid or fully remote based on client needs)
• Compensation: Competitive, commensurate with experience and expertise.

To apply, please submit your résumé and a brief cover letter outlining your relevant experience and why you are the ideal candidate for this role. We look forward to exploring how your skills can contribute to our client’s success in the evolving payroll and temporary work landscape.