Senior Product Engineer — AI-Driven CI Platform

blacksmith; New York (NY); On-site; USD 140,000 - 210,000; Full time

Benefits offered by this job

Health insurance

Competitive base + equity

401K match

Unlimited PTO

Annual offsite

Early-exercise stock options

Parental leave 12 weeks

Job summary

Blacksmith in New York City is building a background coding agent platform and seeks engineers who can design fast, polished frontend interfaces for our analytics and observability tooling. You will help engineers delegate coding tasks to AI and ship features quickly.

You’ll collaborate with design to deliver high-performance UIs, optimize browser performance, and own full-stack delivery from prompts to UI in an exciting early-stage startup.

Qualifications

• 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 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.

Responsibilities

• 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

Skills

React

Frontend development

CS fundamentals

Ambiguity tolerance

Job description

Blacksmith in New York City is building a background coding agent platform and seeks engineers who can design fast, polished frontend interfaces for our analytics and observability tooling. You will help engineers delegate coding tasks to AI and ship features quickly.

You’ll collaborate with design to deliver high-performance UIs, optimize browser performance, and own full-stack delivery from prompts to UI in an exciting early-stage startup.