Senior Backend Engineer (Python), Agent Developer: Flow Components

GitLab; United States; Remote; USD 140,000 - 210,000; Full time

Benefits offered by this job

Flexible Paid Time Off

Equity Compensation

Employee Stock Purchase Plan

Growth and Development Fund

Parental Leave

Job summary

GitLab is seeking a Senior Backend Engineer on the Flow Components team to help build GitLab's Flow Registry. You'll focus on Python backend work, leveraging LangChain and LangGraph to deliver secure, scalable capabilities across the Duo Workflow Service and the monolith.

You’ll collaborate with product, UX, frontend, and AI specialists, design REST and GraphQL APIs, and improve testing, observability, and on-call readiness while contributing to responsible AI integration.

Qualifications

• Experience building production Python applications with LangChain and LangGraph.
• Experience designing and shipping AI-powered backend features with awareness of large language model limitations.
• Proficiency in designing or extending REST and GraphQL APIs with scalability and backward compatibility.
• Strong SQL skills and familiarity with PostgreSQL.
• Ability to work across the stack in a mature codebase and address performance bottlenecks.

Responsibilities

• Develop, ship, and maintain Flow Registry features across the Duo Workflow Service and GitLab monolith backend.
• Collaborate with Product Management, UX, frontend, backend, and AI specialists to refine requirements and deliver improvements.
• Design, implement, and review REST and GraphQL APIs and related backend logic.
• Improve automated testing with RSpec and other frameworks to strengthen quality and feedback loops.
• Share standards and lessons to support responsible AI integration and evidence-driven engineering.
• Participate in Tier 2 on-call rotations, troubleshoot production issues, and improve observability and resiliency.
• Monitor the competitive landscape and keep Flow Registry capabilities competitive.

Skills

Python backend

REST & GraphQL APIs

SQL & PostgreSQL

Distributed systems

Frontend basics (JS/Vue)

Remote collaboration

Tools

LangChain

LangGraph

GraphQL tooling

Job description

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 valuesand 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 Senior Backend Engineer on the Flow Components functional team, you'll help build GitLab's Flow Registry, which provides reusable primitives for agentic flows built on the GitLab Duo Agent Platform. Your primary focus will be backend engineering in Python, using LangChain and LangGraph to develop secure, reliable, and scalable capabilities across the Duo Workflow Service and the GitLab monolith. You'll also work across the stack when needed, bringing familiarity with JavaScript and frontend development to support the official GitLab Duo Agent Platform client, Duo CLI, and advocate for a strong user experience.

What you’ll do

• Develop, ship, and maintain secure, well-tested, and performant Flow Registry features across the Duo Workflow Service and the GitLab monolith backend.
• Collaborate with Product Management, User Experience, frontend, backend, and artificial intelligence specialists to refine requirements and deliver iterative product improvements.
• Design, implement, and review GraphQL and REST application programming interfaces, related backend logic, and clear contracts with frontend clients.
• Improve automated testing with RSpec and other frameworks to strengthen quality, reliability, and developer feedback loops.
• Share standards, patterns, and lessons with other engineers to support responsible artificial intelligence integration and evidence-driven engineering.
• Participate in Tier 2 on-call rotations, troubleshoot production issues, contribute to root cause analysis, and improve observability and resiliency.
• Monitor the competitive landscape and help keep GitLab's Flow Registry primitives and capabilities competitive within the agentic platform market.

What you’ll bring

• Experience building and maintaining production Python applications with LangChain and LangGraph, including background jobs, application programming interfaces, and data models.
• Experience designing and shipping artificial intelligence-powered backend features and integrations, with sound judgment about large language model limitations and responsible production use.
• Proficiency in designing or extending REST and GraphQL application programming interfaces with attention to scalability, maintainability, and backward compatibility.
• Strong SQL skills and familiarity with relational databases such as PostgreSQL, including efficient queries and data modeling.
• Comfort working across the stack in a mature codebase and addressing performance bottlenecks at the application and, when relevant, infrastructure layers.
• Familiarity with JavaScript and Vue frontend development, with an understanding of user experience principles.
• Clear written and verbal communication skills, including experience writing technical proposals and documentation and collaborating in a remote, asynchronous, cross-functional environment.
• Openness to learning and applying transferable skills from related technologies or domains.

About the team

We work across backend, frontend, User Experience, Product Management, and artificial intelligence disciplines to improve capabilities such as Memory and Duo Developer and support clients including Duo CLI. We collaborate in GitLab's remote, asynchronous environment to build reliable components that help people create and use agentic workflows.

How GitLab Supports Full-Time Employees

• Benefits to support your health, finances, and well-being
• Flexible Paid Time Off
• Team Member Resource Groups
• Equity Compensation & Employee Stock Purchase Plan
• Growth and Development Fund
• Parental Leave

Country Hiring Guidelines: 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.

Privacy Policy: Please review our Recruitment Privacy Policy. Your privacy is important to us.

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 harassment based on any of these characteristics. See also GitLab’s EEO Policy and EEO is the Law. If you have a disability or special need that requires accommodation, please let us know during the recruiting process.

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