Senior Backend Engineer (Ruby), AI Catalog: External Agents

<div class="content-intro"><p>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.</p> <p>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&nbsp;and continuous knowledge exchange, enabling our team members to reach their full potential while collaborating with industry leaders to solve complex problems. <a href="https://www.youtube.com/watch?v=OuZIb5zszQI">Co-create the future with us</a> as we build technology that transforms how the world develops software.</p> <p>*<em>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.</em></p></div><h2>An overview of this role</h2> <p>As a Senior Backend Engineer on GitLab’s External Agents team, you’ll design and build integrations that bring GitLab agents into tools such as Slack and connect external solutions such as Claude Code or Codex with GitLab. You’ll take end-to-end ownership of complex features, help shape architectural patterns for how GitLab exposes its AI functionality, and collaborate with engineers across the Agent Foundations stage and adjacent AI engineering teams. This is a high-visibility area at the intersection of GitLab’s core platform and AI strategy.</p> <h2>What you’ll do</h2> <ul> <li value="1">Develop, ship, and maintain secure, well-tested, and performant external agent integrations across the GitLab monolith backend.</li> <li value="2">Collaborate with Product Management, user experience, frontend, backend, and AI specialists to refine requirements and deliver high-quality improvements iteratively.</li> <li value="3">Design, implement, and review GraphQL and REST application programming interfaces (APIs) and related backend logic, with clear contracts for frontend clients.</li> <li value="4">Improve and extend automated testing, including RSpec and other frameworks, to strengthen quality, reliability, and developer feedback loops.</li> <li value="5">Share standards, patterns, and lessons with other engineers to support responsible AI integration and evidence-based engineering across the team.</li> <li value="6">Participate in Tier 2 <a href="https://handbook.gitlab.com/handbook/engineering/infrastructure-platforms/incident-management/on-call/tier-2/">on-call rotations</a>, troubleshoot production issues, contribute to root cause analysis, and improve observability and resiliency.</li> <li value="7">Assess the competitive landscape and help GitLab build strong AI integrations as agentic technology evolves.</li> </ul> <h2>What you’ll bring</h2> <ul> <li value="1">Experience building and maintaining production applications with Ruby on Rails, including background jobs, APIs, and data models.</li> <li value="2">Comfort working across the stack in a mature codebase.</li> <li value="3">Proficiency in designing or extending REST or GraphQL APIs with attention to scalability, maintainability, and backward compatibility.</li> <li value="4">Practical experience designing and shipping AI-powered backend features or integrations.</li> <li value="5">Strong SQL skills and familiarity with relational databases such as PostgreSQL, including efficient queries and data modeling.</li> <li value="6">Experience identifying and addressing performance bottlenecks at the application and, where relevant, infrastructure layers.</li> <li value="7">Openness to learning, collaborating in an asynchronous, distributed team, and applying transferable skills from related technologies or domains; familiarity with Python backends or Vue frontends is a plus.</li> </ul> <h2>About the team</h2> <p>External Agents is a functional team within the <a href="https://handbook.gitlab.com/handbook/engineering/ai/agent-foundations/ai-catalog/">AI Catalog group</a>. We will initially consist of three engineers across Europe, the Middle East, and Africa (EMEA) time zones, while the wider AI Catalog group includes more than eight engineers across Asia-Pacific (APAC), EMEA, and the Americas (AMER). Other teams in AI Catalog focus on agent creation and curation. Together, we partner with teams across AI engineering and GitLab to help the GitLab Duo Agent Platform become the backbone for AI features across the product.</p><div class="content-conclusion"><h4><strong>How GitLab Supports Full-Time Employees</strong></h4> <ul> <li><a href="https://about.gitlab.com/handbook/total-rewards/benefits/general-and-entity-benefits/">Benefits to support your health, finances, and well-being</a></li> <li><a href="https://handbook.gitlab.com/handbook/people-group/time-off-and-absence/time-off-types/#flexible-paid-time-off-pto">Flexible Paid Time Off&nbsp;</a></li> <li><a href="https://handbook.gitlab.com/handbook/company/culture/inclusion/tmrg-tmag/">Team Member Resource Groups</a></li> <li><a href="https://handbook.gitlab.com/handbook/total-rewards/stock-options/">Equity Compensation &amp; Employee Stock Purchase Plan</a></li> <li><a href="https://handbook.gitlab.com/handbook/people-group/learning-and-development/growth-and-development/">Growth and Development Fund</a></li> <li><a href="https://about.gitlab.com/handbook/total-rewards/benefits/general-and-entity-benefits/#parental-leave">Parental Leave</a>&nbsp;</li> </ul> <p>Please note that we welcome interest from candidates with varying levels of experience; many successful candidates do not meet every single requirement. Additionally, studies have shown that people from <a href="https://about.gitlab.com/company/culture/inclusion/#examples-of-select-underrepresented-groups">underrepresented groups</a> are less likely to apply to a job unless they meet every single qualification. If you're excited about this role, please apply and allow our recruiters to assess your application.</p> <hr> <p><strong>Country Hiring Guidelines: </strong>GitLab hires new team members in countries around the world. All of our roles are remote, however some roles may carry specific location-based eligibility requirements. Our Talent Acquisition team can help answer any questions about location after starting the recruiting process.&nbsp;&nbsp;</p> <p><strong>Privacy Policy: </strong>Please review our <a href="https://handbook.gitlab.com/handbook/hiring/candidate-faq/recruitment-privacy-policy/" target="_blank">Recruitment Privacy Policy.</a> Your privacy is important to us.</p> <p>GitLab is proud to be an equal opportunity workplace and is an affirmative action employer. GitLab’s policies and practices relating to recruitment, employment, career development and advancement, promotion, and retirement are based solely on merit, regardless of race, color, religion, ancestry, sex (including pregnancy, lactation, sexual orientation, gender identity, or gender expression), national origin, age, citizenship, marital status, mental or physical disability, genetic information (including family medical history), discharge status from the military, protected veteran status (which includes disabled veterans, recently separated veterans, active duty wartime or campaign badge veterans, and Armed Forces service medal veterans), or any other basis protected by law. GitLab will not tolerate discrimination or hara