Staff Backend Engineer, Software Supply Chain Security

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 a Staff Backend Engineer at GitLab, you will help shape a major investment in our Software Supply Chain Security offering. In this role, you'll serve as a senior technical leader for backend systems that help customers secure how software is built, verified, and delivered inside the GitLab platform. You'll work on foundational capabilities across package policy enforcement, build provenance, artifact signing, and malicious package detection, with a strong focus on enterprise-grade security and performance. You'll define architecture before systems are built, write clear technical proposals, and guide implementation across interconnected parts of GitLab such as CI/CD, dependency management, and security workflows. This role is a strong fit for someone who enjoys solving complex backend problems, influencing technical direction across teams, and building security features that matter to customers facing real threats. You'll do this in GitLab's remote, asynchronous, and values-driven environment, where written communication, ownership, and teamwork are central to how we work. Some examples of our projects: Dependency Firewall for package policy enforcement across supported registries Artifact attestation and signing using supply chain security standards and the Sigstore ecosystem What you’ll do Define and drive the technical architecture for the SSCS Add-On, including backend systems for package policy enforcement, provenance generation, artifact signing, and malicious package detection. Lead design and implementation work for Supply-chain Levels for Software Artifacts (SLSA) Level 2 and Level 3 capabilities within GitLab CI/CD. Architect integrations with Sigstore services such as Cosign, Fulcio, and Rekor, including approaches for signing workflows, verification, and trust boundaries. Design backend services and request paths that support allow, deny, and quarantine package policies with strong performance and reliability expectations. Review merge requests with a focus on security, architectural consistency, maintainability, and test quality. Mentor Backend Engineers across experience levels, helping raise the technical bar through design guidance, feedback, and hiring participation. Partner with Product, Infrastructure, Authentication, Authorization, and Security counterparts on cross-team technical decisions. Contribute to relevant open source and industry conversations, including working groups related to software supply chain security where appropriate. What you’ll bring Strong experience building backend applications with Ruby on Rails in a high-scale production