Senior Software Engineer - Paris in Crawley

Vestiaire Collective is the leading global online marketplace for desirable pre‑loved fashion. Our mission is to transform the fashion industry for a more sustainable future by empowering our community to promote the circular fashion movement. Vestiaire was founded in 2009 and is headquartered in Paris with offices in London, Berlin, New York, Singapore, Ho Chi Minh and Hong Kong and warehouses in Tourcoing (France), Crawley (UK), Hong Kong and New York. We currently have a diverse global team of 700 employees representing more than 50 nationalities. Our values are Activism, Transparency, Dedication and Greatness and Collective. We are proud to be a BCorp.

Vestiaire Collective is looking for a Senior Software Engineer M/F/D to join the Offer Management team located in Paris.

About the role: The Offer Management squad is at the heart of how buyers and sellers connect and make deals on Vestiaire Collective. We own and build the key features that power this interaction, including negotiation, messaging, and pricing strategies, ensuring a smooth, fair, and engaging experience for both sides. As a Senior Backend Engineer, you will play a central role in evolving these core capabilities. You will work closely with engineers across platforms (Android, iOS, Web), as well as product and design, to craft services that are scalable, reliable and impactful. This is a high‑impact role where technical decisions directly influence the user experience and business outcomes.

What you will do:

• Design and build scalable, high‑performance backend services and APIs that handle tens of millions of requests daily.
• Drive architecture decisions by contributing to technical design sessions and delivering clean, maintainable, long‑term solutions.
• Modernize the platform by leading the migration from our PHP monolith to Go‑based microservices and defining bounded contexts.
• Collaborate cross‑functionally with Product, Design, Data, and iOS/Android/Web engineers to deliver features that enhance user experience and personalization.
• Ensure system reliability by implementing strong observability practices, including monitoring, logging, and alerting, while addressing performance bottlenecks.
• Own the full delivery cycle, from technical design and implementation to deployment and production monitoring.
• Uphold high engineering standards through thoughtful code reviews, mentorship, and precise documentation.
• Continuously improve system performance, reliability, and the overall developer experience.

Who you are:

• Technical expertise: Mastery in either PHP or Go, with at least 5 years of experience in your primary language. Deep expertise in one is essential; experience in both is a plus.
• Architectural vision: Strong understanding of microservices architecture, distributed systems principles, and scalable design patterns.
• Proven builder: Track record of building and maintaining production systems that handle significant traffic and large data volumes.
• System design and code quality: Skilled in designing scalable, maintainable systems and writing clean, well‑tested, efficient code following best practices (SOLID, DDD, Hexagonal Architecture, etc.).
• Problem solver: Analytical mindset with meticulous attention to detail when debugging complex distributed systems.
• Product‑minded engineer: Appreciation for how technical decisions impact user experience, and ability to translate business requirements into technical solutions.
• Strong collaborator: Excellent communicator, able to articulate technical concepts clearly, defend your proposals with evidence, and stay open to team input.
• Autonomous and accountable: You take full ownership of your code and architecture, from design to delivery, and drive initiatives with minimal supervision.

Our Tech Stacks includes:

• Languages: PHP, Go
• Application Framework: Symfony
• Data & Messaging Databases: MySQL/MariaDB, MongoDB
• Caching: Redis, Memcached
• Message Queuing & Streaming: RabbitMQ, Amazon SQS, Kafka
• Infrastructure & DevOps: AWS, Docker, Terraform, GitHub
• Documentation & Project Management: Jira, Swagger/OpenAPI
• Observability: Data Dog, Grafana

What we offer:

• A meaningful job with an impact on the way people consume fashion and promote sustainability.
• The opportunity to do career‑defining work in a fast‑growing French‑born scale‑up.
• The possibility to work as part of a globally diverse team with more than 50 nationalities.
• Two days to help Project – reinforcing your activist journey and volunteer for an association.
• Significant investment in your learning and growth.
• Competitive compensation and benefits package.
• As full member of our entrepreneurial project, you will be eligible to receive free shares.

Research indicates that people from underrepresented backgrounds— including women, people with disabilities, and other marginalized communities— often hesitate to apply for roles unless they meet every single requirement. At Vestiaire Collective, we believe that talent comes in many forms, and we’re committed to creating an inclusive environment where everyone can thrive. Your unique perspective could be exactly what our team needs, so we encourage you to apply even if you don’t tick every box.

Vestiaire Collective is an equal opportunities employer.

Beware of Scams: Vestiaire Collective only contacts candidates via official emails ending in @vestiairecollective.com. We never use WhatsApp, Telegram, or similar apps for job offers, nor will we ever request payments or banking details. If you receive a suspicious message, please report it.