Product Engineer

About Blacksmith

• We started by building infrastructure to run CI workloads really fast. Our first product helps companies run GitHub Actions substantially faster and cheaper by owning and operating our own global fleet of bare-metal machines rather than renting generic cloud VMs.

• Today, we orchestrate tens of millions of Firecracker VMs each month, running CI for 1,200+ companies and hit ~$10M in ARR in less than 2 years.

• We operate thousands of bare-metal machines across multiple regions, regularly schedule 30k+ vCPUs concurrently, and run a petabyte-scale Ceph cluster that we manage ourselves.

• We’ve raised $13.5M across Seed and Series A, led by Google Ventures (GV), and we’re intentionally building a small, but exceptional team.

• Blacksmith was founded by a team with deep systems and scaling experience, including building search/ads infrastructure at Faire, and operating large distributed systems at Cockroach Labs. Our GTM is led by Jon Boyer, formerly Head of Sales at Zapier.

• We’re now extending the same CI infrastructure into a broader platform: running agent sandboxes at scale and building our own background coding agent on top of it.

You are a good fit if you

• Have strong CS fundamentals and a deep understanding of React and modern frontend development.

• Can work closely with design to build polished, high-performance UIs — and aren’t afraid to go deep on browser performance, rendering bottlenecks, or complex component architecture.

• Have 3+ years of software development experience.

• Enjoy working in person 5 days a week in NYC or SF.

• Enjoy working at a very early-stage startup and are comfortable with ambiguity.

Bonus

• You’ve dabbled in your own side hustles or start-up projects.

• You’re comfortable creating new processes and iterating on them quickly.

Compensation and benefits

• Medical, Vision, and Dental insurance.

• Competitive base + equity.

• Unlimited PTO.

• Annual offsite.

• Early-exercise stock options

• 12 weeks fully paid parental leave (US)