Staff AI Engineer

Description

Cobalt runs AI agents in production that test real customer applications. We’re looking for a Staff AI Engineer who has built and operated production agent systems and can help us make them more reliable, secure and cost-efficient.

You’ll set the technical direction for how we design, evaluate, ship and operate agents, and stay hands-on building the foundations our teams use. You’ll work across engineering, product, research and security, mentoring engineers and helping teams turn promising prototypes into dependable production systems.

Your primary focus will be our agent platform and production practices. You’ll also help engineering teams improve how they build software with AI coding agents.

What You’ll Do

• Set technical direction for agent systems across teams, including orchestration, tool use, context and memory management, human oversight and failure recovery.
• Design, build and operate shared foundations: evaluation frameworks, agent observability and tracing, execution controls, and model access with routing and failover where needed.
• Establish evaluation practices that measure task completion, accuracy, false positives, security and cost per successful task. Work with domain experts to build representative test cases and turn production fa