Senior Backend Engineer (Ruby), AI Engineering: Duo Agent Platform Tools

ABOUT THE ROLE As a Senior Backend Engineer on the AI Engineering team at GitLab, you will play a critical role in designing, building, and maintaining systems that allow AI agents to interact with the full software delivery lifecycle. This is a high-visibility area of the product at the intersection of GitLab's core platform and its AI strategy. WHAT YOU'LL DO As a Senior Backend Engineer, you will be responsible for taking end-to-end ownership of complex features, establishing architectural patterns for how GitLab exposes its rich functionality to AI agents, and collaborating closely with engineers across the Agent Foundations stage and adjacent teams within AI engineering. Your key responsibilities will include: Developing, shipping, and maintaining features and improvements for Agentic Tools across the GitLab monolith backend in a secure, well-tested, and performant way Collaborating with Product Management, UX, frontend, backend, and AI specialists to refine requirements and deliver high-quality, iterative product enhancements Designing, implementing, and reviewing GraphQL, REST APIs and related backend logic, ensuring reliability, scalability, and clear contracts with frontend clients Improving and extending automated testing, including RSpec and other frameworks, to strengthen quality, reliability, and developer feedback loops Sharing standards, patterns, and learnings with other engineers, raising the bar for responsible AI integration and evidence-driven engineering across the team Participating in on-call rotations to troubleshoot production issues, contribute to root cause analysis, and enhance observability and resiliency Bringing a sharp eye to the competitive landscape, helping us understand what it takes to keep GitLab’s MCP server best-in-class in an increasingly agentic world WHAT YOU'LL NEED To succeed in this role, you will need: Experience building and maintaining production applications with Ruby on Rails, including work with background jobs, APIs, and data models Comfortable working across the stack in a mature codebase, with familiarity with Python backends and/or Vue frontends a plus Proficiency in designing or extending REST and/or GraphQL APIs with attention to scalability, maintainability, and backward compatibility Practical experience designing and shipping AI-powered backend features and integrations, including sound judgment about large language model limitations and responsible use in production Strong SQL skills and familiarity with relational databases such as PostgreSQL, including writing efficient queries and understanding data modeling Ability to identify and address performance bottlenecks at the application and, where relevant, infrastructure layers Openness to learning, collaborating in an async-first, distributed team, and applying transferable skills from related technologies or domains WHY REMOTE As a remote employee at GitLab, you will have the flexibility to work from anywhere while being part of a global team. You will be expected to collaborate closely with colleagues across different time zones and be comfortable with asynchronous communication. BENEFITS As a full-time employee at GitLab, you will be eligible for a range of benefits, including: Benefits to support your health, finances, and well-being Flexible schedule and remote work options Opportunities for professional growth and development Competitive salary and equity package