Staff Software Engineer, AI Data Platform

Labelbox • San Francisco, CA

7d • $250,000 - $280,000 • Hybrid

About The Position

Labelbox is the RL data factory for advancing frontier agent capabilities. We build the data, evaluations, and infrastructure that frontier labs use to train and judge their agents. We're looking for talented, experienced engineers to join us. The bar is high: engineers who have strong judgment and set technical direction, quickly build prototypes that scale into the reliable systems, and are at the frontier of agent-first engineering practices and innovating to accelerate the speed of the business.

Requirements

• 4+ year track record of shipping systems customers and other engineers rely on
• Ability to build full stack prototypes fast and ensure they hold up.
• Strong system and API design judgment
• Ability to make, defend, and update hard architecture and product calls.
• Experience shipping production code with coding agents daily.
• Ability to set direction by being the example.
• Ability to move fast in ambiguous, startup-pace environments with influence over authority.
• Experience working in all parts of the stack
• Deep proficiency in TypeScript and/or Python.

Nice To Haves

• Production experience building LLM- or agent-driven products.
• Experience designing evaluations for LLMs and agents, or producing high-quality data for ML systems.
• Background in production distributed systems, ML infrastructure, or data systems at scale.

Responsibilities

• Build Eval systems that run millions of agent trajectories to measure model and product quality.
• Develop fine-tuning pipelines that turn evaluation signals into measurable agent improvements.
• Create agent-first product surfaces: UX and infrastructure for workflows where the user is a model or an agent operator.
• Build the systems behind hundreds of thousands of AI interviews used to source and match freelance workers to projects.
• Develop infrastructure that scales to the throughput frontier labs actually need.
• Integrate the latest models and capabilities into production within days of release.

Benefits

• Equity packages
• Life at Labelbox: Career advancement opportunities directly tied to your impact
• Vision: Be part of building the foundation for humanity's most transformative technology

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed