Senior Backend Engineer — AI-Driven Plan Workflows

GitLab; United States; Remote; GBP 90,000 - 140,000; Full time

Benefits offered by this job

Health benefits

Flexible paid time off

Team Member Resource Groups

Equity Compensation

Growth and Development Fund

Parental Leave

Job summary

GitLab is seeking a Senior Backend Engineer in the United Kingdom to join the Plan: Spec-Driven Development team. You will own backend flows, APIs, data models, and evaluation systems behind the agent-driven experience, using Ruby on Rails, Python, PostgreSQL, GraphQL, GitLab Duo Agent Platform, and AI interfaces.

In a small, distributed team, you’ll lead major features from concept through release, mentor other engineers, and influence technical decisions across agent workflows and evaluation

Qualifications

• 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.

Responsibilities

• 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.

Skills

Ruby on Rails

Python

GraphQL

API design

PostgreSQL

Tools

GitLab Duo Agent Platform

LLM APIs

Job description

GitLab is seeking a Senior Backend Engineer in the United Kingdom to join the Plan: Spec-Driven Development team. You will own backend flows, APIs, data models, and evaluation systems behind the agent-driven experience, using Ruby on Rails, Python, PostgreSQL, GraphQL, GitLab Duo Agent Platform, and AI interfaces.

In a small, distributed team, you’ll lead major features from concept through release, mentor other engineers, and influence technical decisions across agent workflows and evaluation