Senior Backend Engineer - AI-Powered, Remote & Async

GitLab; Poland; On-site; PLN 272,000 - 408,000; Full time

Benefits offered by this job

Flexible Paid Time Off

Equity Compensation & Employee Stock P

Growth and Development Fund

Parental Leave

Job summary

GitLab is seeking a Senior Backend Engineer on the Plan: Spec-Driven Development team. You will own backend flows, APIs, data models, and evaluation systems using Ruby on Rails, Python, PostgreSQL, GitLab Duo Agent Platform, LLM APIs, and an AI gateway.

You’ll join a small, all-remote team building high-visibility features, mentor others, and influence technical decisions. Poland base salary range is 272,000 - 408,000 PLN.

Qualifications

• Strong Ruby on Rails experience in a large production codebase.
• Experience driving substantial projects with several engineers over multiple months.
• 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, APIs, 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 APIs, and an AI gateway.
• Collaborate 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 all-remote environment.

Skills

Ruby on Rails

Python

Product mindset

End-to-end ownership

API design

AI-assisted development

Independent work

Tools

GraphQL

PostgreSQL

Job description

GitLab is seeking a Senior Backend Engineer on the Plan: Spec-Driven Development team. You will own backend flows, APIs, data models, and evaluation systems using Ruby on Rails, Python, PostgreSQL, GitLab Duo Agent Platform, LLM APIs, and an AI gateway.

You’ll join a small, all-remote team building high-visibility features, mentor others, and influence technical decisions. Poland base salary range is 272,000 - 408,000 PLN.