TL;DR
Keystone, a YC S25 startup founded in 2025, is hiring its first engineer to build an AI-native error monitoring product that investigates production issues and proposes code fixes. The in-person role is based in SoMa, San Francisco, offers $150K–$300K plus equity, and follows a short technical interview loop and onsite project.
What happened
Keystone, led by founder Pablo Hansen and part of Y Combinator's S25 cohort, posted a listing for its first engineering hire. The startup is developing an error monitoring system designed from the ground up for AI: it aims to parse codebases and logs, trace failures, and produce actionable fixes. The company raised a $5.2 million seed round from True Ventures, Twenty Two Ventures, Pear VC, Ritual Capital and several founder angels, and lists Perplexity and Lovable among early design partners. The role is in-person in SoMa, San Francisco, and emphasizes end-to-end product delivery across frontend and infrastructure. The technical stack includes TypeScript, React (Next.js), Python, Postgres, Redis and AWS. Compensation is advertised as top-of-market salary with significant equity, full health/dental/vision, meals covered and an equipment budget. The interview process includes 2–3 short technical screens followed by an onsite exercise.
Why it matters
- Automating investigation and code fixes could change how teams handle production incidents.
- Hiring a founding engineer offers outsized product and technical influence early at the company.
- The $5.2M seed and noted investors suggest investor confidence in the concept and team.
- Early design partnerships indicate the product is being developed with real engineering feedback.
Key facts
- Company: Keystone; Founder: Pablo Hansen; Founded: 2025; YC batch: S25.
- Role: Founding Engineer (first engineering hire), in-person in SoMa, San Francisco.
- Compensation: $150,000–$300,000 salary; 0.50%–3.00% equity.
- Experience & requirements: 1+ years experience; skills listed include Python, React, TypeScript; visa: US citizen/visa only.
- Product focus: AI-native error monitoring that investigates production issues and generates code fixes.
- Seed funding: $5.2M from True Ventures, Twenty Two Ventures, Pear VC, Ritual Capital and multiple founder investors.
- Stack: TypeScript, React (Next.js), Python, Postgres, Redis, AWS.
- Benefits: full health/dental/vision, meals covered, equipment budget.
- Interview: 2–3 short technical screens, then an onsite with a small project and culture discussion.
- Early design partners: Perplexity and Lovable.
What to watch next
- Product expansion beyond the initial vertical Keystone is starting with — the company says it plans to expand (timing and specific verticals not confirmed in the source).
- How the system integrates with existing observability stacks and tools like Sentry (specific integrations not confirmed in the source).
- Adoption and feedback from early design partners such as Perplexity and Lovable as the product matures.
- Timeline for a broader public launch or general availability: not confirmed in the source.
Quick glossary
- Founding engineer: An early technical hire who helps design core product architecture, sets engineering practices, and has substantial influence over technical and product decisions.
- Error monitoring: Tools and systems that collect runtime errors, logs, and telemetry to help developers detect, triage, and resolve production issues.
- Design partner: A company or team that collaborates closely with a startup to provide product feedback, validation, and real-world testing during development.
- Seed funding: An early stage of venture capital financing intended to support product development, hiring, and initial go-to-market activities.
- YC S25: A Y Combinator batch designation; indicates the company participated in the accelerator program identified by that batch label.
Reader FAQ
What is Keystone building?
An AI-native error monitoring tool that investigates production issues and generates code fixes.
Where is the role located and is it remote?
The position is in-person in SoMa, San Francisco.
What compensation and benefits are offered?
The listing shows $150K–$300K salary, 0.50%–3.00% equity, full health/dental/vision, meals covered, and an equipment budget.
What is the interview process?
Candidates go through 2–3 short technical screens and, if there is a fit, an onsite with a small project and discussions.
When will Keystone publicly launch its product?
not confirmed in the source
AboutCompaniesStartup JobsFind a Co-FounderLibrarySAFEResources Apply Keystone 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,…
Sources
- Keystone (YC S25) is hiring engineer #1 to automate coding
- Keystone: Your team's on-call AI engineer
- expand.ai (YC S24) Is Hiring a Founding Engineer to help turn …
- Founding Engineer: Backend + AI-Focused Full-Stack …
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