Novancy, a leading staffing and talent recruitment firm specializing in Information Systems and Digital Transformation, is seeking a dedicated Senior C# ASP.NET Core Developer to support a client in the payroll and temporary work industry. This freelance position offers a long‑term contract with the flexibility of remote work, allowing you to contribute from anywhere while collaborating closely with a dynamic team of developers and business analysts.

Key Responsibilities

• Design, develop, and maintain high‑quality applications using C# and ASP.NET Core 8, ensuring adherence to industry best practices and coding standards.
• Implement asynchronous programming patterns, generics, and design patterns to create scalable, maintainable codebases.
• Leverage Entity Framework Core to model data, optimize LINQ queries, and generate efficient SQL statements for PostgreSQL databases.
• Develop comprehensive unit tests with xUnit and Moq to guarantee code reliability and facilitate continuous integration.
• Collaborate with cross‑functional teams to translate complex business rules related to payroll and temporary work into robust technical solutions.
• Analyze performance bottlenecks and propose optimization strategies to enhance application speed and resource usage.
• Document technical designs, API contracts, and deployment procedures for future reference and knowledge transfer.

Qualifications

• Proven expertise in C# and ASP.NET Core 8, with a strong portfolio of production‑ready applications.
• Deep understanding of Entity Framework Core, LINQ, and PostgreSQL, including schema design and query tuning.
• Experience with unit testing frameworks such as xUnit and mocking libraries like Moq.
• Demonstrated ability to architect scalable systems and optimize performance for large‑scale workloads.
• Strong analytical and problem‑solving skills, with a methodical approach to debugging and refactoring.
• Knowledge of the payroll and temporary work industry is a significant advantage.
• Self‑sufficient, responsible, and capable of working independently while maintaining clear communication with stakeholders.
• Fluency in French is required; English proficiency is a plus.

What We Offer

• A long‑term freelance contract with competitive compensation aligned with industry standards.
• Remote work flexibility, enabling you to balance professional commitments with personal life.
• Opportunity to work on challenging projects that impact the payroll and temporary work sector.
• Collaboration with a supportive team that values innovation, continuous learning, and professional growth.

If you are a seasoned developer with a passion for building high‑performance applications and a desire to contribute to a forward‑thinking organization, we encourage you to apply. Join Novancy and help shape the future of payroll technology.