Senior Software Engineer-Backend Major - Code Foundations

HI, WE’RE BACK MARKET. We’re here to help make tech reliable, affordable, and better than new. We're a global marketplace for refurbished devices, helping lower our collective environmental impact by providing trustworthy, affordable tech with 92% less carbon emissions than new. Yep, you read that right. Turns out refurbished tech is way better for the planet than new. In fact, With every device purchased on Back Market, our positive impact on the planet grows. From our Customer Care representatives to our software engineer, every individual at Back Market cuts the planet — and consumers — a break. Our mission is simple: to do more with what we already have. Are you ready to join us? About the team The Code Foundation team is dedicated to providing foundational tools, libraries, and standards that enhance developer productivity and ensure consistency across application development. By fostering a culture of experimentation and enabling robust observability, the team empowers developers to deliver high-quality products efficiently and effectively. As a Software Engineer, you will work closely with all members of your squad, and the Staff engineer of your group. Bi-monthly rituals with your group and the Chapter will allow you to share what works for your squad, learn what works for others, and make sure your technical direction is aligned with the overall vision. What you will do in this role We’re looking for versatile engineers who show strong ownership and are motivated to take on new challenges across the technical stack while helping us move our technology forward. You will be working in an agile "build it and run it" environment where engineering teams build, launch, monitor and support the product that they own. Driven by the desire to craft outstanding products, you understand how to deliver seamless user experiences at scale. We are looking for passion in creating systems by producing clean, consistent and well-organised code. As well as a good team player supporting colleagues and creating a learning and sharing environment! English must be a no-brainer as you will join an international team dispatched in different locations around the world (US/FR/ES/JP). Our technical environment Backend stack: Python - FastAPI , SQLAlchemy, Celery, Golang, Django (being phased out) Frontend stack: VueJS, Typescript, Nuxt, Revolve ( our design system) Data: PostgreSQL, Redis, Kafka, RabbitMQ, BigQuery Infrastructure: GCP, Kubernetes, Docker, Datadog, ArgoCD, CircleCI, Github Main technical challenges Traditionally based on a monolith, Back Market's technical stack has been undergoing a radical transformation in recent years into a distributed and service-oriented architecture. This transition provides an opportunity to modernize the platform, raising engineering standards. Building a set of efficient and loosely coupled services is one of the main challenges to face for the years to come. But teams are excited to independently control their release schedules, manage their data, SLAs, tools, and – ultimately – be responsible for their own service-offering. Meanwhile, Platform teams are working to provide a scalable, consistent and secure platform, one that makes engineering teams more productive. As an Experienced Engineer: Produce, Innovate & Share - Facilitates meaningful discussions around complex issues. - Suggests or makes improvements for existing designs and architecture for quarter-bounded projects or mission-critical areas in their squad. - Explores technologies with sizable potential impact for the team. - Is able to contribute actively to high impact chaos mitigation. - Identifies and advocate for prioritization of tasks that can optimize delivery Backend focus (experienced): - 3+ years backend development experience - Strong system design skills - Experience with microservices, distributed systems - Deep understanding of data architecture and APIs - Experience with performance optimization and scalability Frontend capabilities (experienced): - Solid experience with modern JavaScript frameworks - Can independently build frontend features - Understanding of state management, routing, API integration - Considers performance, accessibility, and UX in implementations Fullstack mindset - End-to-end product thinking - Curiosity about the full stack - Strong collaboration and communication skills - Ability to navigate ambiguity across technical domains Recruitment process - HR screening - (45 min) - Coding & Testing module - Backend (60 min) - System design feature (60 min) - Data module (45 min) - Tech leadership + Meet your manager ( 75 min) - BM Values (45 min) Hybrid policy - Barcelona office 3 days / week at the office - Monday is mandatory WHY SHOULD YOU JOIN US ? ✌🏼 At Back Market, we’re committed to hiring and supporting diverse teams of people from all backgrounds, experiences, and perspectives — it’s one of the reasons we’re such a high-scoring certified B Corp company (93.2). No matter your role and seniority level, you’ll enjoy impact-driven work with hands-on career development in an innovative, driven, and fast-paced environment — with benefits to match, like: - A mission driven work environment where your day to day makes an impact on the planet. Seriously. - Hybrid work environment, with 2 remote days a week and 1 remote work week per quarter, plus 3 flex days. - Employee Resource Groups, including mentorship programs, comprehensive accessibility policies, and cultural competency training. At Back Market, we strive to create a workplace that embodies the world we’re trying to change. We’ve embedded our diversity, equity, and inclusion principles into our DNA — from dedicated staff to employee resource groups to our company values. We know that the perfect background for a role doesn’t mean the perfect fit — we encourage you to apply for a role even if you think you may not have all the qualifications. If reasona