Senior Fullstack Developer .NET / Flutter

Project overview

Our client is looking for a Senior Fullstack Developer .NET / Flutter (M/F) for a freelance mission.

The mission involves the development of a multi-country digital platform and its mobile application. The consultant will be involved in the entire development chain, from backend services to mobile functionalities, to improve user experience and support product evolution.

Minimum 8 years of experience in software development.

• Design, develop, test, and maintain .NET REST APIs and backend services.
• Develop and evolve mobile functionalities using Flutter.
• Take ownership of complex end-to-end functionalities, from design to production.
• Model business concepts and participate in technical architecture and user experience choices.
• Ensure consistency between APIs, data models, and mobile flows.
• Ensure code quality through automated tests and code reviews.
• Optimize performance, scalability, security, and data protection for backend and mobile components.
• Instrument user flows and contribute to the quality of analytical data.
• Monitor production components, manage incidents, and ensure application reliability.
• Integrate AI agents into development workflows and verify generated results.
• Proven expertise in .NET backend or Flutter mobile development, with at least 1 to 2 years of production experience in the other technology.
• For a backend focus: mastery of C#, REST APIs, microservices, and business modeling.
• For a mobile focus: expertise in Flutter, Dart, modular architectures, state management, and API integration.
• Advanced use of AI tools and agents in development workflows, with systematic validation of results.

Project details

• Start: flexible
• Remote: hybrid
• Location: Paris, France, FR
• Rate: 74-74 EUR/h
• Languages: French