Senior .NET Developer

October 20, 2026

Hybrid

Senior

Paris

Indeed

Keep in mind

Original vacancy is in French
You will likely need French for the job. The employer can confirm

Also worth knowing

Mandatory office attendance
English is required

Description

Backend development, modernization and reliability of digital advertising solutions on C#/.NET and ASP.NET Core. The consultant joins a team of three Software Engineers and works closely with the Engineering Team Lead and Product teams. The role covers API and microservices design, cloud evolution, CI/CD practices, performance monitoring and production incident resolution, plus responsible use of generative AI tools in development.

Responsibilities

Design, develop and maintain backend applications and services in C#/.NET and ASP.NET Core
Participate in modernizing existing applications, including legacy components
Contribute to the design and evolution of APIs, microservices and event-driven architectures
Take part in architecture discussions and technical decisions
Ensure code quality, maintainability, security and performance
Contribute to application evolution in cloud environments
Participate in containerization and deployment improvement work
Contribute to CI/CD and DevOps practices
Monitor application performance and help resolve production incidents
Identify and propose improvements in reliability, scalability and operational efficiency
Use or be strongly aware of generative AI tools applied to software development
Analyze, test and critically validate code generated by these tools
Contribute to the adoption of effective and responsible development practices integrating these technologies
Collaborate with Engineering, Product teams and relevant technical stakeholders
Participate in code reviews and sharing of best practices
Help resolve complex technical problems
Participate in the team's continuous improvement efforts

Requirements

Minimum 7 years of experience in software development
Expertise in C#/.NET, notably modern versions .NET 8/10
Experience with .NET Framework 4.7.2
Very good command of ASP.NET Core
Strong backend development, API design and software architecture skills
Experience with production applications, including incident resolution and performance optimization
Hands-on practice or strong awareness of generative AI applied to software development, with ability to critically evaluate generated code
Cloud environments AWS and/or Microsoft Azure
Docker and Kubernetes
Microservices and event-driven architectures
CI/CD and DevOps practices
Monitoring and observability tools (Grafana, Bugsnag)
Cloud cost optimization (FinOps)
AI-assisted development tools: Claude Code, Cursor, GitHub Copilot or equivalents
Knowledge of AdTech environments, tracking and advertising attribution
Awareness of GDPR/ePrivacy issues