Senior Software Engineer - Appmericans team

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 We are looking for a Senior Software Engineer to join our Appmericans squad 💚. Back Market is building their first engineering team in NYC! We are looking for passionate team members to join our office of 40+ people in Union Square, and a 250+ engineering team worldwide. This team's mission is to help us spread the word about refurbished tech to save the planet and your wallet at the same time. We are looking for a Senior Software Engineer with deep backend expertise to play a key role in our strategic US market expansion. Our goal is to enhance user engagement by accelerating the development of innovative features and optimizing the overall customer experience across web and app platforms. As one of the engineers in our first US-based engineering team, you will work with Software Engineers, two iOS engineers and an iOS tech lead/manager, collaborating closely on full-stack solutions that power our US customer experience. While your primary focus will be backend services and architecture, you'll also contribute to web frontend development when needed to deliver complete, end-to-end features. Your expertise in scalable, performant backend platforms built with Go and Python, combined with your ability to contribute to modern web frontends, will be key to the team's success. You will work closely with a product manager and UX designer to ensure the right features are designed and delivered with quality and velocity. You will participate in the Back Market backend community, partnering with others to continuously improve our practices. 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! What will be your next missions? - Build efficient micro services that power both web and mobile experiences, mastering the squad's technical stack and delivering features autonomously with comprehensive testing methodologies. - Design and implement robust backend services using Go as the primary language, with Python where appropriate, ensuring scalability, performance, and reliability for high-quality user experiences. - Contribute to web frontend development using modern frameworks (Vue.js/TypeScript), bridging backend and frontend by designing clear API contracts and delivering complete, end-to-end features. - Collaborate with a cross-functional team of peers from various disciplines (iOS, Backend, Frontend, SRE, CyberSec, Data, etc.), to foster a culture of technical excellence and shared knowledge. - Take ownership of squad-level technical projects, managing dependencies and delivering solutions that realize engineering and product visions while balancing scope with delivery timelines. - Build and maintain observability ecosystems using tools like Datadog to track performance, errors, and core functionality, Big Query to gain data insights, and implement strategies to prevent regressions. - Drive quality improvements by mastering the complete SDLC, delivering high-quality, non-disruptive releases to production, and taking ownership of Quality of Service enhancements. - Participate in on-call rotation, leading incident response and chaos mitigation for squad-owned services, including hotfix processes and root cause analysis. - Write clean, maintainable code with insightful code reviews, challenging technical approaches pragmatically and advocating for simpler solutions backed by data. - Share knowledge through documentation and team discussions, beginning to provide valuable input on topics outside your immediate area, and supporting team members through technical guidance. 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 a Senior Engineer: Produce, Innovate & Share - Facilitates meaningful discussions around complex issues. - Suggests or