Who We Are Koah Labs is building the ad network to power the next generation of AI-native products. Our mission is to help publishers monetize and help advertisers reach the right audience — without compromising speed, UX, or privacy. We’re a small, tight-knit team in San Francisco with backgrounds at X, Apple, Meta, and early-stage startups. We’ve raised from top investors and are growing fast with real traction on both the publisher and advertiser sides. Working at Koah means joining at the ground floor: you’ll ship code that shapes the company and the ecosystem we’re building. We move quickly, operate with high trust, and care deeply about craft. Our Stack • Infra: Terraform, AWS, LGTM (Loki, Grafana, Tempo, Mimir), Tailscale, Cloudflare • Data: PostgreSQL, ClickHouse, Redis, Kafka, Python • Core Application: Ruby on Rails, React, TypeScript • SDKs: iOS, Android, Web, Flutter, React Native In this role, you will • Sit within product engineering and help drive product decisions using data and causal reasoning • Design, implement, execute experiments and analyze results • Help level-up all of engineering, encouraging data driven decisions and a deep understanding of the important metrics that drive our business forward • Use rigorous statistical thinking and hands-on modeling to turn our rich marketplace data into tools that directly shape product decisions and key insights You might be a fit if • You have an advanced degree in Physics, Computer Science, Mathematics, Statistics, Engineering, or a related field • You enjoy identifying and owning challenging problems, forming testable hypotheses, and conducting impactful research to drive significant business impact • You have a relentless focus on continuous learning and making an impact with an ability to question the status quo • You have strong mathematical and statistical modeling skills • You enjoy communicating conclusions to both technical and non-technical audiences alike