C# Developer Consultant

Mission Overview:

We are seeking to enhance and extend the functionalities of an existing course management platform developed in C# with a PostgreSQL database. This consultancy mission at a client site representing Keystone Solutions aims to optimize the experience for both teachers and students.

Consultancy Nature: As a consultant, you will work on-site, collaborating closely with a team to deliver impactful solutions.

Dynamic Projects: You will face diverse challenges across various client environments, ensuring no two days are the same.

Turbo-Charged Learning: This role offers extensive professional development and broad learning experiences, enhancing your skill set.

Skyrocketing Ambition: At Keystone Solutions, we are committed to your career growth within our framework.

Values: Being a "K-Stone" means bringing our core values to every engagement.

Responsibilities:

• Develop new features in C#.
• Optimize PostgreSQL queries to improve performance.
• Implement the RESTful API for integration with other educational tools.
• Create user interfaces for new functionalities.

Key Steps:

• Analyze existing systems and gather educational needs.
• Design new functionalities.
• Develop extensions.
• Conduct testing, optimization, and integration.

Technical Requirements:

• Main Language: C#
• Framework: .NET (version to be specified according to existing setup)
• Database: PostgreSQL
• ORM: Entity Framework Core
• Frontend: ASP.NET Core MVC or Blazor (depending on existing architecture)
• API: ASP.NET Core Web API
• Testing: NUnit or xUnit
• Project Management: Azure DevOps or Jira

Technical Constraints:

• Ensure compatibility with the existing version of C# and .NET.
• Optimize PostgreSQL queries to handle a large number of users and courses.
• Adhere to security and privacy standards for educational data.
• Ensure accessibility of new features for all users.
• Design an intuitive and responsive user interface.

If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal .

Duration: 02/11/2026 - 31/12/2027 14 months • (part time 3/5)

Skills required:

• Agile / Scrum - Level: Confirmed - Most recent: Any time
• C# - Level: Confirmed - Most recent: Any time
• JIRA - Level: Junior - Most recent: Any time
• ORM (object-relational mapping) - Level: Confirmed - Most recent: Any time
• Postgres - Level: Confirmed - Most recent: Any time
• Web development - Level: Confirmed - Most recent: Any time

Language requirements:

French
Level Active knowledge