Senior Software Engineer, Security Factory: Code Security

GitLab is an intelligent orchestration platform for DevSecOps that helps organizations improve developer productivity, operational efficiency, security, and compliance. The Senior Backend Engineer will build code security capabilities spanning dependency analysis, vulnerability detection, AI-assisted analyzers, security report integrations, and automated dependency remediation. The role also involves technical ownership, mentoring, cross-functional collaboration, and on-call support.

Responsibilities:

• Act as the directly responsible individual (DRI) for team initiatives from design through delivery, shipping with minimal guidance in partnership with the technical lead
• Bring systems built by one engineer to team ownership through documentation, tests, and shared review
• Design and ship analyzers that pair deterministic analysis capabilities with AI-driven analysis, and build the evaluation harnesses that measure their false positives and missed findings against benchmark applications with known vulnerabilities, raising the bar for what counts as a trustworthy result. That includes detection rules mapped to CWE and the test fixtures that prove they work
• Package those analyzers for every place GitLab runs them, including CI jobs, AI agent workflows, and command-line tools, with findings reported in GitLab's standard security report formats
• Design and ship the manifest, lockfile, and SBOM parsing that tells the static analysis engine what a project depends on, and extend it to new ecosystems and formats
• Ship features across the automated remediation service that turns security advisories into dependency update merge requests, from sandboxed updates to merge request creation
• Solve technical problems of high scope and complexity, actively seek out difficult impediments affecting the whole team, and advocate for improvements to quality, security, and performance with Product Management, Engineering stakeholders such as Frontend and UX, and partner teams such as Code Scanning and Composition Analysis
• Mentor Intermediate engineers through code review and pairing, and maintain our internal standards for style, maintainability, and best practices through review
• Participate in on-call rotations to assist troubleshooting product operations, security operations, and urgent engineering issues

Requirements:

• Experience building your own LLM tooling, such as a harness, an agent pipeline, or evaluations, with the judgment to know when output is trustworthy and when it isn't
• Substantial professional experience writing and testing production code in a systems language, particularly Go and/or Rust, with depth in at least one
• Familiarity with package managers and dependency management in one or more language ecosystems, such as npm, Maven, pip, Bundler, or Cargo
• Demonstrated application security experience, such as vulnerability research, secure code review, or writing detection rules, and fluency with vulnerability classes (OWASP Top 10, CWE) and the software supply chain
• A track record of taking ownership of ambiguous problems and shipping with minimal guidance, with the self-motivation and organizational skills suited to a remote, largely asynchronous environment
• Demonstrated capacity to communicate clearly and concisely about technical problems, and to write design proposals that bring a team to a decision
• Experience building tooling around package managers and dependency management
• Experience evaluating AI-driven detection against labeled data, including measuring false positives and missed findings
• Experience with performance optimization at scale
• Hands-on program analysis experience, such as parsing, ASTs, or data-flow analysis
• Familiarity with popular web or mobile application frameworks and how they handle input, data, and configuration
• Experience with containerized workflows and CI/CD (we use Docker heavily)