Senior Back-end Developer – .NET

METALINE

. Analyze business needs and contribute to defining technical specifications .

Posted 10/14/2026contractChâtillon • FranceSenior💰 €600 per dayWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive expertise in .NET back-end development, particularly with C#, .NET Core, and Entity Framework Core, while applying software design principles such as DDD, SOLID, and Clean Code. Proficient in T-SQL and experienced in implementing messaging systems like Kafka or RabbitMQ, with a strong focus on unit and integration testing.

Highest-signal resume keywords

C# DevelopmentASP.NET CoreEntity Framework CoreT-SQLSoftware Design Principles

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Hard Skills

C#ASP.NET CoreEntity Framework CoreT-SQLUnit TestingIntegration TestingAsynchronous CommunicationSoftware CraftsmanshipClean CodeSOLID

Soft Skills

Independent WorkAnalytical SkillsProblem SolvingCollaborationCommunication

Tools & Technologies

KafkaRabbitMQSolaceSQL DatabaseDevelopment Tools

Industry Keywords

E-commerceBack-end DevelopmentTechnical SpecificationsCode ReviewsProduction Incidents

Tech Stack

Tools & technologies

Entity FrameworkKafkaRabbitMQSQL.NET

About the role

Key responsibilities & impact

Analyze business needs and contribute to defining technical specifications
Participate in the design and architecture of back-end solutions
Develop application components in C# and .NET
Design and optimize SQL database access
Implement asynchronous communication and messaging mechanisms
Apply Software Craftsmanship principles: Clean Code, SOLID, and DDD
Write unit tests, contribute to integration testing, and ensure code quality
Participate in code reviews and continuously improve development practices
Document development work and prepare the deliverables required for deployment
Provide corrective and evolutionary maintenance for applications
Contribute to the analysis and resolution of production incidents
Participate in the recruitment process, including phone screenings, technical interviews, and meetings with clients

Requirements

What you’ll need

More than 10 years of experience in .NET back-end development
Essential expertise in C# / .NET Core / .NET 8 or 9 / Entity Framework Core
Advanced knowledge of DDD, SOLID, and Clean Code
Strong proficiency in T-SQL
Experience with Kafka, RabbitMQ, or Solace
Strong command of unit-testing and integration-testing best practices
Ability to work independently throughout the analysis, design, and development phases
Strong knowledge of software design principles and development best practices
Experience in an e-commerce environment is highly desirable
Fluent French