Founding Product Engineer ($130K-$160K + 0.20%-0.40% Equity) at Asteroid (20)

Founding Product Engineer

Asteroid - YC-backed startup building browser-based AI agents

Salary: $130K-$160K + 0.20%-0.40% Equity

Location: San Francisco, USA

Job Description: You will invent new design paradigms for human-agent supervision at scale. As a founding engineer, you'll own the entire user experience from greenfield design systems to mission-critical browser agent interfaces. This role is for a product-obsessed builder with elite taste who wants to define how the world interacts with the next generation of AGI.

Why this role is remarkable:

• Shape the interface of the future by designing how humans supervise agent workforces across complex, exception-heavy healthcare and enterprise workflows.
• Join a world-class founding team backed by Y Combinator (W25) and top angels from OpenAI and Hugging Face in a high-growth environment.
• Enjoy complete greenfield ownership over the platform's UX and design system, moving far beyond simple chat windows into novel AI-native interactions.

What you will do:

• Build and own the end-to-end platform UX, including a unified design system and core frontend features using TypeScript and Go.
• Drive user adoption by conducting interviews, reviewing PostHog sessions, and iterating on onboarding to make complex agent executions intuitive.
• Function as a full-stack owner, building features from backend infrastructure to polished landing pages and customer-facing tools.

The ideal candidate:

• Has 3+ years of experience shipping B2B products used by thousands of users with a strong portfolio of high-quality frontend work.
• Possesses incredible visual taste and Figma fluency, balancing perfectionism with the pragmatic need to ship rapidly in a startup environment.
• Demonstrates an AI-native mindset with the ability to manage customer accounts directly and translate feedback into high-impact platform improvements.