Software Engineer - Product

Koahlabs

San Francisco, California, United States Remote permanent

Posted: October 1, 2025

Required Skills

Job Description

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 $5.7M from top investors and are growing fast with real traction on both the publisher and advertiser sides of the marketplace.

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:

• Help shape the foundation of our engineering organization

• Lead initiatives across the stack, with high agency in product direction and technical design

• Dive deeply into technically challenging and rewarding work, whether it is optimizing our matching algorithms or creating world class experiences that reach millions of users

• Partner with cross functional stakeholders in data and GTM to drive product direction that our customers need

• Embrace an experimentation mindset - we are constantly trying to learn about how users are interacting with AI-native products, and use data from these experiments to drive our work.

You might thrive in this role if you:

• Have experience building and scaling production quality systems and experiences

• Are comfortable working across the stack, tackling new tasks out of your comfort zone, and can handle ambiguity

• Work well in-person and enjoy fast feedback loops

• Enjoy breaking down problems and testing your hypotheses

• Get excited about end-to-end ownership within high agency environments

• Have been a startup founder or an early-stage engineer

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