Intermediate Backend Engineer, Cells Infrastructure
GitLab B.V. · 🌍 Bangalore, India
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About the role
GitLab is the intelligent orchestration platform for DevSecOps. GitLab enables organizations to increase developer productivity, improve operational efficiency, reduce security and compliance risk, and accelerate digital transformation. More than 50 million registered users and more than 50% of the Fortune 100* trust GitLab to ship better, more secure software faster. The same principles built into our products are reflected in how our team works: we embrace AI as a core productivity multiplier, with all team members expected to incorporate AI into their daily workflows to drive efficiency, innovation, and impact. GitLab is where careers accelerate, innovation flourishes, and every voice is valued. Our high-performance culture is driven by our values and continuous knowledge exchange, enabling our team members to reach their full potential while collaborating with industry leaders to solve complex problems. Co-create the future with us as we build technology that transforms how the world develops software. * Fortune 500® is a registered trademark of Fortune Media IP Limited, used under license. Claim based on GitLab data. Fortune 100 refers to the top 20% ranked companies in the 2025 Fortune 500 list, published in June 2025. Fortune and Fortune Media IP Limited are not affiliated with, and do not endorse products or services of GitLab. An overview of this role As an Intermediate Backend Engineer on GitLab's Cells Infrastructure team, you'll help build the architecture that lets GitLab.com scale horizontally. Cells splits GitLab.com into independent units, each with its own application and data stack, behind a shared routing layer. You'll build the services and application changes that make Cells work: the control plane that tracks cells and organizations, the routing logic that sends each request to the right cell, and the changes inside the GitLab application that keep data unique and consistent across cells. Your work will directly support moving customer organizations onto Cells, one of GitLab's most important scaling initiatives. You'll work across Go, Ruby on Rails, and TypeScript. What you’ll do • Design, build, and maintain the Cells control plane, a Go service using gRPC (remote procedure calls) and backed by Cloud Spanner that tracks cells, organizations, and globally unique resources. • Extend the global routing layer, written in TypeScript on Cloudflare Workers, so requests reach the right cell. This includes classifying requests by path, namespace, and token, and supporting more protocols and services. • Make changes in the GitLab Rails application so it works across multiple cells: claiming globally unique resources, propagating organization context, and keeping cell-local data consistent. • Design application programming interfaces (APIs) and data models with correctness, idempotency, and backward compatibility in mind, so changes can roll out safely across a fleet of cells. • Write thorough automated tests, including unit, integration, and end-to-end tests, and improve test coverage and reliability across the services we own. • Instrument your services with OpenTelemetry for metrics, logs, and distributed tracing. Help define service level objectives (SLOs) and take part in on-call for the services you build. • Work with product teams to make their features cell-compatible, and review their changes for Cells correctness. • Write clear design documents, architecture decision records, and documentation, and take part in code review as both author and reviewer. What you’ll bring • Professional experience building and running backend services in production, including monitoring, debugging, and incident response. You've instrumented services with OpenTelemetry and used distributed tracing to debug reques