# Backend / Infra Engineer at Lemma

- Company: Lemma (YC F25)
- What the company does: Production Monitoring for AI agents. Backed by Y Combinator.
- Company website: https://www.uselemma.ai/
- Type: Startups (AI role)
- Level: Mid level
- Location: San Francisco, CA, US
- Work setup: On-site
- Pay: $150K to $200K base salary per year (USD)
- Posted: 2026-08-13
- Apply by: 2026-10-08
- Apply: https://www.ycombinator.com/companies/uselemma/jobs/NIopCzH-backend-infra-engineer
- Page: https://www.1752.vc/careers/jobs/lemma-backend-infra-engineer/

## About the role

Lemma reads all of your agent conversations, finds the failures nobody knew to look for, and opens the PR that fixes them. Right now it works because it's small and we're watching it. This role is about making it work when it's large and nobody is watching it.

## What they're looking for

- 4+ years on backend or data infrastructure, with something high-volume in your history you can talk about in real detail
- Strong TypeScript. The whole codebase is TypeScript, including the core service and workflows
- Comfort with columnar stores and the economics of storing a lot of events cheaply. We run ClickHouse, Quickwit, and Qdrant, and you'll have opinions about all three
- Pragmatism about scale. We need architecture that survives 100x, built by someone who won't build for 100x on day one
- Bonus: anomaly detection work where the ground truth was genuinely unknown
- Bonus: you've built the enterprise deployment path before. Self-hosted, VPC, air-gapped

Tags: Engineering