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# Senior Backend Engineer (Ruby), Plan Spec-Driven Development

- **Company:** GitLab
- **Location:** Redruth, UK
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Python (Programming Language), PostgreSQL, Ruby on Rails, Ruby, SQL Databases, Backend, Gitlab, Graphql, Front End Software Development, Restful APIs
- **Published:** August 13, 2026
- **Apply:** https://www.totaljobs.com/job/senior-engineer-ruby/gitlab-job107837526

## About the Role

* Strong Ruby on Rails experience in a large production codebase and production experience with Python.
 * Experience driving substantial projects with several engineers over multiple months, with clear user or business outcomes.
 * A product mindset and experience owning features end to end, including shaping scope, making trade-offs, engaging with users, and learning from adoption after launch.
 * A full stack background with a current focus on backend engineering, plus the ability to read modern frontend code and design effective APIs.
 * Strong application programming interface design and structured query language fundamentals.
 * Experience exploring artificial intelligence-assisted development.
 * The ability to work independently, collaborate across functions and regions, and support others through technical leadership and mentoring. Experience with GraphQL, PostgreSQL performance at scale, or building and evaluating large language model or agent systems is helpful but not required.

## Description

* Lead backend features from early product discussions through technical design, implementation, rollout, and post-launch learning.
 * Build the flows, application programming interfaces, and data models behind agent-generated work items, implementation plans, durable specifications, and mergeable code.
 * Develop evaluation and benchmarking systems that measure workflow quality, token cost, and success rate.
 * Use Ruby on Rails and Python to build reliable production systems, with PostgreSQL, GraphQL, representational state transfer, GitLab Duo Agent Platform, large language model application programming interfaces, and an artificial intelligence gateway.
 * Collaborate directly with product, design, engineers, design partners, and users to shape scope and make practical trade-offs.
 * Coordinate multi-person projects across the team and communicate decisions clearly in GitLab's asynchronous, all-remote environment.
 * Mentor other engineers and contribute to technical direction across the Plan group and related artificial intelligence initiatives.
 * Work in short iterations, share progress through demos, and use results and user feedback to guide what comes next.


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