Backend Developer (.Net Core) - Navigation team - Freelance (W/M/X)

Debtt Group; Paris; Sur place; EUR 50 000 - 70 000; Plein temps

Avantages offerts par ce poste

Flexible office policy (up to 2 days working from home)

Access to e-learning courses

Participation in meetups and conferences

Résumé du poste

Debtt Group is seeking a Senior Backend Developer (.NET Core) for its Navigation team in Paris, France. This freelance role involves developing and maintaining robust APIs and distributed services to enhance the storefront experience. You will collaborate with Product and Data teams to ensure performance and reliability in production systems.

The ideal candidate has over 5 years of backend development experience, strong expertise in C# and .NET Core, and a solid understanding of APIs and async processes.

Qualifications

• 5+ years of backend software development experience.
• Strong hands-on experience with C# and .NET / .NET Core.
• Experience building and maintaining APIs and distributed backend systems.

Responsabilités

• Develop new features for APIs and background services.
• Integrate with internal and external platforms via HTTP APIs.
• Maintain code quality through design and best practices.

Connaissances

C# and .NET / .NET Core

APIs and asynchronous processing

PostgreSQL and Cassandra

Event-driven architectures

Unit tests and integration tests

Concurrency and resiliency

English fluency

Description du poste

Backend Developer (.Net Core) - Navigation team - Freelance (W/M/X)

Not explicitly vibe coding — traditional backend engineering with some mention of AI/LLM exposure.

About the Role

Freelance Backend Developer (.NET Core) for Veepee's Navigation team to build and maintain APIs, background workers, and distributed services that power the storefront experience. The role focuses on reliability, performance, integrations, and collaboration with Product and Data teams to deliver production‑ready backend solutions.

Job Description

Veepee is hiring a Backend Developer (.NET Core) to join the Navigation team responsible for delivering the storefront experience across web and apps. The role involves building features across APIs, background workers, importers, schedulers, and event‑driven services, and ensuring reliability, scalability, and performance in production systems.

Key Responsibilities

• Develop new features for APIs, asynchronous/background workers, importers, schedulers, and event‑driven services.
• Integrate with internal and external platforms via HTTP APIs, messaging systems, and data pipelines.
• Maintain code quality through clean design, code reviews, automated tests, and observability best practices.
• Contribute to reliability, scalability, and performance of distributed production applications.
• Collaborate with Product, Data, and other engineering teams to translate requirements into robust technical solutions.
• Produce clear technical documentation and share knowledge within the team.
• Participate in technical interviews for prospective developers.

Requirements

• 5+ years of backend software development experience.
• Strong hands‑on experience with C# and .NET / .NET Core.
• Experience building and maintaining APIs, asynchronous processing, and distributed backend systems.
• Good knowledge of relational and non‑relational databases, especially PostgreSQL and Cassandra.
• Experience with event‑driven architectures and messaging platforms (Kafka or RabbitMQ).
• Experience designing and troubleshooting integrations over HTTP.
• Strong emphasis on code quality: unit tests, integration tests, and production readiness.
• Comfortable with concurrency, resiliency, failure handling, and operational constraints.
• Fluent in English and product‑minded with pragmatic delivery focus.

Nice to Have

• Experience with DDD, Clean Architecture, or modular backend design.
• Experience with Dapper and SQL‑heavy, performance‑oriented data access.
• Experience with distributed workers, schedulers, batch/import pipelines, or background jobs.
• Experience with observability, logging, monitoring, and troubleshooting production issues.
• Familiarity with Elasticsearch.
• Experience with AI‑related systems such as LLMs, agents, or MCP.
• Variable bonus.
• Flexible office policy (up to 2 days working from home).
• Access to e‑learning courses and self‑education resources.
• Participation in local and international meetups and conferences.
• Work within dynamic, international teams.

Experience Level

Senior

Employment Type

• Flexible office (up to 2 days WFH)
• Participation in meetups and conferences (local & international)
• Work within international teams / dynamic environment