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BlacksmithBlacksmithNew York, NY

Product Engineer

Builds AI-powered coding agents, debugging tools, and high-performance UIs for CI platform using React and full-stack skills. Requires 3+ years experience, strong CS fundamentals, and onsite work in NYC.

200k – 300k
On-site3+ YOEFullstack Engineering

About the role

What you could work on

  • Build and evolve Codesmith, our background coding agent — designing the workflows, UI, and infrastructure that let engineers delegate coding tasks to AI and ship faster
  • Create tools that help engineers and AI agents debug flaky CI jobs: surfacing patterns in test failures, correlating logs with infrastructure signals, and making root cause analysis fast and intuitive
  • Work closely with design to ship polished, high-performance product surfaces across our analytics and observability platform, where engineers go to understand their CI systems
  • Prototype and iterate rapidly on AI-powered features — from natural language interfaces to automated fix generation — and own the full stack from prompt design to backend service to UI
  • Contribute to the architecture of the agent platform: how we run sandboxed workspaces, and orchestrate agent sessions

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
  • 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
  • 401K match
  • Unlimited PTO
  • Annual offsite
  • Early-exercise stock options
  • 12 weeks fully paid parental leave (US)

Skills

ReactJavaScriptTypeScriptCSSHTMLUi/UxBrowser PerformanceFrontend FrameworksAI/MLPrompt Engineering
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