GitLab is an open-core software company that develops the most comprehensive AI-powered DevSecOps Platform, used by more than 100,000 organizations. Our mission is to enable everyone to contribute to and co-create the software that powers our world. When everyone can contribute, consumers become contributors, significantly accelerating human progress. Our platform unites teams and organizations, breaking down barriers and redefining what’s possible in software development. Thanks to products like Duo Enterprise and Duo Agent Platform, customers get AI benefits at every stage of the SDLC.

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.

An Overview of This Role

The Custom Models team is responsible for Duo Self-Hosted, a key component in GitLab AI that allows customers to run GitLab Duo features in completely private environments, connecting GitLab to their own AI models. The team works collaboratively with numerous teams to ensure a complete lifecycle of features that implement controls for customization and guarantee a smooth experience for our largest customers. In the near future, the team will return to evaluating LLM models and advancing AI capabilities.

What You’ll Do

Contribute to our features using JavaScript (30%), Ruby on Rails (50%), and Python (20%), working with both frontend and backend components in a mature codebase.
Collaborate closely with backend, frontend, product, and UX teammates across time zones in an async-first environment.
Write maintainable, well-tested code and participate in code reviews that help you and your team grow.
Maintain and improve the quality and stability of our applications by contributing to bug fixes and QA.
Resolve production issues, supporting customers and resolve production issues, and learning along the way.
Operate in an agile and fast-paced environment, adapt to shifting priorities and project types, and focus on outcomes.
Take ownership of projects from proposal to production, collaborating across teams to deliver end-to-end solutions.

What You’ll Bring

Full-stack development experience: Proven ability to work across the stack, with experience distributed approximately across JavaScript (30%), Ruby (50%), and Python (20%). Comfortable working with both frontend and backend components in a mature codebase.
Strong JavaScript skills: Experience with modern JavaScript (and ideally a framework like Vue.js), particularly in the context of full-stack development.
Strong Ruby and Python skills: Experience building and maintaining production applications using Ruby on Rails and Python, including work with background jobs, APIs, and data models.
API development: Experience designing or extending REST and/or GraphQL APIs with attention to scalability, maintainability, and backward compatibility.
LLM prompting and integrations: Hands-on experience with prompt engineering, integrating LLMs into applications, and building features powered by generative AI.
SQL and data layer expertise: Strong command of writing efficient queries and working with relational databases such as PostgreSQL.
Performance-minded: Skilled at identifying and resolving performance bottlenecks at both application and infrastructure levels.

Nice-to-Haves

Familiarity with LLM evaluation, RAG patterns, or ML model deployment (especially using cloud platforms like AWS or GCP).
Experience with Langchain, LangSmith, DSpy, or similar LLM/AI frameworks.
Contributions to open-source projects (especially GitLab or ML-related).

Why Join Us

This isn’t just a job; it’s your chance to shape the future of AI at GitLab. You will be working on one of the most impactful products at GitLab. We operate asynchronously, with a strong environment of support, ownership, and collective success. You’ll gain deep expertise in Ruby, Python, and the GitLab platform while contributing to a core area of the product that directly supports millions of users.

As part of our team, you’ll:

Work on a widely-used open core product with passionate contributors and users
Grow in a high-trust environment that values transparency and iteration
Collaborate closely with Product and UX partners
Have access to a defined career development framework and opportunities for mentorship and growth

About the Team

The Custom Models team consists of GitLab team members from around the globe. Engineers are primarily located across various European countries, with some members in Australia and Canada.

The team works closely with these other teams within the organization:

AI Framework
MLOps
Model Validation
Duo Chat

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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