Your team’s on-call AI engineer
Founding Engineer
$150K - $300K•0.50% - 3.00%•San Francisco, CA, US
Job type
Full-time
Role
Engineering, Full stack
Experience
1+ years
Visa
US citizen/visa only
Skills
Python, React, TypeScript
Connect directly with founders of the best YC-funded startups.
About the role
About Keystone
We’re building AI-native error monitoring that automatically investigates production issues and generates code fixes. Think Sentry, but built from the ground up for a world where AI can actually understand your code…
Your team’s on-call AI engineer
Founding Engineer
$150K - $300K•0.50% - 3.00%•San Francisco, CA, US
Job type
Full-time
Role
Engineering, Full stack
Experience
1+ years
Visa
US citizen/visa only
Skills
Python, React, TypeScript
Connect directly with founders of the best YC-funded startups.
About the role
About Keystone
We’re building AI-native error monitoring that automatically investigates production issues and generates code fixes. Think Sentry, but built from the ground up for a world where AI can actually understand your codebase, trace through logs, and tell you exactly what broke and how to fix it.
We’re starting here and expanding until we’re the default tool for building product, period. Our mission is to free engineers from the drudgery of digging through logs, setting up systems, and debugging- so they can focus on understanding users and designing great products.
We’re in-person in SoMa, San Francisco. We raised a $5.2M seed from True Ventures, Twenty Two Ventures, Pear VC, and Ritual Capital- plus the founders of YC, Dropbox, Supabase, Eight Sleep, Graphite, Resend, RocketMoney, and more. Early design partners include teams at Perplexity and Lovable.
About the Role
You’d be the first engineering hire, working directly with me (the founder) to build the core product. You’ll have more ownership and influence over the product, culture, and technical direction than you’d get almost anywhere else.
Example projects:
- 2-week sprint to build a new product vertical from scratch
- Design a new interface for engineering workflows that wasn’t possible until a model advancement that came out yesterday
You might be a great fit if you:
- Have shipped products end-to-end (frontend to infra) and obsess over the details
- Work fast and comfortably with ambiguity- we’re figuring things out as we go
- Get excited about hard problems at the intersection of AI and developer tools
- Want to be genuinely early, not "early at a 50-person series B"
Stack: TypeScript, React (Next.js), Python, Postgres, Redis, AWS
Comp & benefits: Top-of-market salary + significant equity, full health/dental/vision, all meals covered, equipment budget
About the interview
If there appears to be a fit, we’ll reach to schedule 2-3 short technicals. After, we’ll schedule an onsite in our office, where you’ll work on a small project, discuss ideas, and get a sense for our in-person culture.
About Keystone
Founded:2025
Batch:S25
Team Size:1
Status:Active
Location:San Francisco
Founders