Senior Product Engineer

The role

You will build and evolve Codesmith, a background coding agent. You will create tools for debugging flaky CI jobs and prototype AI-powered features.

What you will do

• Build and evolve Codesmith, a background coding agent
• Create tools to help engineers and AI agents debug flaky CI jobs
• Work closely with design to ship polished, high-performance product surfaces
• Prototype and iterate rapidly on AI-powered features
• Own the full stack from prompt design to backend service to UI
• Contribute to the architecture of the agent platform

Required qualifications

• Strong CS fundamentals
• Deep understanding of React and modern frontend development
• Ability to build polished, high-performance UIs
• 5+ years of software development experience
• Enjoy working in person 5 days a week in NYC
• Enjoy working at a very early-stage startup and are comfortable with ambiguity

Nice to have

• Dabbled in your own side hustles or start-up projects
• Comfortable creating new processes and iterating on them quickly

Benefits

• Medical, Vision, and Dental insurance
• Competitive base + equity
• 401K match
• Unlimited PTO
• Annual offsite
• Early-exercise stock options
• 12 weeks fully paid parental leave (US)

About the company

Blacksmith builds infrastructure to run CI workloads fast using a global fleet of bare-metal machines. The company is extending its CI infrastructure into a broader platform for running agent sandboxes at scale.