Senior Product Builder — Engineering, AI-Driven

a16z-speedrun; San Francisco (CA); On-site; USD 150,000 - 200,000; Full time

Benefits offered by this job

Unlimited PTO

Job summary

Brief is the context navigator for product teams. We aggregate business context and make it legible to people and AI agents through chat, Slack, CLI, and voice. We hire Product Builders with engineering focus and a strong sense for UX and user empathy.

The role centers on engineering, with ownership of frontend features, collaboration with founders, and building AI-enabled workflows that even AI agents use. We value taste, judgment, and a long tenure in software.

Qualifications

• 6+ years as a software engineer.
• Strong TypeScript and React fundamentals.
• Product taste is non-negotiable.
• Naturally curious and detail-oriented.
• High ownership.
• Has worked at a startup or with a high engineering bar.

Responsibilities

• Define, design, and build features end-to-end without handoff.
• Build customer-facing UI that is fast, opinionated, and polished.
• Work directly with the founders on product direction—no PM layer, no design queue.
• Use AI agents in daily workflow and build AI-powered products.
• Find whats broken, confusing, or missing and fix it proactively.
• Drive architecture decisions, not just implementation.

Skills

TypeScript

React fundamentals

Full-stack capable

Product sense

Ownership

Startup experience

Tools

Next.js

Tailwind

Radix UI

Inngest

PostgreSQL/Supabase

Vercel AI SDK

Job description

Brief is the context navigator for product teams. We aggregate business context and make it legible to people and AI agents through chat, Slack, CLI, and voice. We hire Product Builders with engineering focus and a strong sense for UX and user empathy.

The role centers on engineering, with ownership of frontend features, collaboration with founders, and building AI-enabled workflows that even AI agents use. We value taste, judgment, and a long tenure in software.