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

Veepee; Paris; On-site; EUR 85,000 - 110,000; Full time

Benefits offered by this job

Variable bonus

International teams

E-learning platform

Meetups & conferences

Hybrid work options

Job summary

Veepee in Paris is seeking a seasoned Software Engineer to join the Navigation team, building APIs and backend services for a fast-growing e-commerce storefront.

You will own features across APIs, background workers, and event-driven services, shaping scalable systems while collaborating with Product, Data and other engineering teams. Fluent English required; hybrid work available.

Qualifications

• 5+ years of backend software development.
• Strong hands-on experience with C# and .NET.
• Experience building and maintaining APIs, asynchronous processing, and distributed backend systems.
• Monitoring, observability, incident management and AB testing experience.
• Knowledge of PostgreSQL and Cassandra databases.
• Experience with HTTP integrations and external/internal service designs.
• Emphasis on unit/integration tests and production readiness.
• English fluency and product-minded pragmatism.

Responsibilities

• Develop new features across APIs, background workers, importers, schedulers, and event-driven services.
• Integrate with internal and external platforms via HTTP APIs, messaging, and data pipelines.
• Ensure code quality through clean design, code reviews, tests, and observability.
• Improve reliability, scalability, and performance of distributed applications in production.
• Collaborate with Product, Data and other engineering teams to refine needs into robust solutions.
• Write clear technical documentation and share knowledge with the team.
• Lead technical interviews with fellow developers.

Skills

5+ years backend dev

C# & .NET

API design

Distributed systems

Observability

English fluency

Concurrency & resiliency

Product-minded

Tools

Dapper

Kafka/RabbitMQ

PostgreSQL

Cassandra

Elasticsearch

Job description

Pioneer of online flash sales since 2001 and key player in European e-commerce, Veepee collaborates with over 7,000 brands to offer highly discounted products available for a limited time. Operating across various sectors, including fashion, home, wine, travel or beauty… Veepee achieved a turnover of 3.3 billion euros incl. VAT in 2024 and employs 5,000 staff members across 10 countries.

JOB DESCRIPTION

Today we’re looking for a software engineer who will join the Navigation team. This team ensures our website and apps present the most attractive storefront experience every day.

TASKS

• Develop new features across APIs, background workers, importers, schedulers, and event-driven services.

• Integrate with internal and external platforms through HTTP APIs, messaging systems, and data pipelines.

• Ensure code quality through clean design, code reviews, automated tests, and observability best practices.

• Contribute to the reliability, scalability, and performance of distributed applications running in production.

• Work closely with Product, Data, and other engineering teams to refine needs and turn them into robust technical solutions.

• Write clear technical documentation and share knowledge with the team.

• Handle the technical interviews with other developers willing to join .

MUST HAVE skills

• 5+ years of experience in backend software development.

• Strong hands-on experience with C# and .NET.

• Solid experience building and maintaining APIs, asynchronous processing, and distributed backend systems.

• Strong skills in monitoring, operational support, incident management, observability, and A/B testing are particularly valuable.

• Good knowledge of relational and non-relational databases, especially PostgreSQL and Cassandra

• Experience designing and troubleshooting integrations with external/internal services over HTTP.

• Strong focus on code quality, including unit tests, integration tests, and production readiness.

• Comfortable working on systems with concurrency, resiliency, failure handling, and operational constraints.

• Fluent in English.

• Product-minded, pragmatic, and able to balance technical quality with delivery priorities.

NICE TO HAVE skills

• Experience with DDD, Clean Architecture, or modular backend design.

• Experience with Dapper, SQL-heavy applications, and performance-oriented data access.

• Experience with distributed workers, schedulers, batch/import pipelines, or background jobs.

• Experience with observability, logging, monitoring, and troubleshooting production issues.

• Experience with Postgres, Cassandra, ElasticSearch

• Experience with event-driven architectures and messaging platforms such as Kafka or RabbitMQ.

• Experience with AI-related systems such as LLMs, agents, or MCP.

BENEFITS

• Variable bonus;

• The dynamic and creative environment within international teams;

• The variety of self-education courses on our e-learning platform;

• Participation in meetups and conferences locally and internationally;

• Flexible Office with up to 2 days at home.

RECRUITMENT PROCESS

30-minute HR Screen with a Veepee Recruiter

General Technical exchange

Technical exchange with a tech lead

Team Interview

We are convinced that it is up to you to define the way you work, to develop yourself, and to progress. At Veepee we guarantee that you can just be yourself! For the service of diversity and inclusion, Veepee is committed to reviewing all applications received on an equal basis.

COMPANY
For more information about our ecosystem: https://careers.veepee.com/en/home-page-en/

WHO WE ARE

Veepeeᵀᵉᶜʰ is a tech community of 500 collaborators who play a key role in Veepee’s innovative strategy.

From Warsaw to Sevilla, through Brussels, Amsterdam, Paris, Lyon, Nantes, Nice, Barcelona, Madrid and Lausanne all our projects are developed in an agile environment with a wide skills variety where you’ll be sure to find your place, no matter the technology you work with.

If you love to try things why don’t you jump on this new adventure?

Need more info > https://careers.veepee.com/en/

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