Software Engineer - Platform

Koah Labs; San Francisco (CA); On-site; USD 140,000 - 200,000; Full time

Job summary

Koah Labs is building the ad network powering AI-native products. We’re a tight-knit team in San Francisco, shipping code that shapes our ecosystem.

You’ll design, build, and maintain the infrastructure that underpins our growing adtech platform, with ownership of critical systems from data pipelines to core services. We value engineers who are passionate about performance, reliability, and experimentation, and who want to work on a breadth of systems across Infra, Data, and Core Applications.

Qualifications

• Experience designing, building and maintaining infrastructure for production-scale systems.
• Detail-oriented with a focus on performance and reliability.
• Enjoy diving deep into problems and owning platform layers powering products.
• Love experimentation, measurement, and building reliable systems.
• Willing to own a breadth of systems across the stack.

Responsibilities

• Design and maintain production-grade infrastructure for an adtech platform.
• Scale and operate systems to handle growth and reliability.
• Own and evolve the platform layer that powers Koah Labs’ products.
• Experiment, measure, and iterate to improve performance and reliability.

Skills

Production systems

Platform ownership

System design

Problem solving

Performance optimization

Education

Bachelor's degree in Computer Science or related field

Tools

Terraform

AWS

Loki

Grafana

Tempo

Mimir

Tailscale

Cloudflare

PostgreSQL

ClickHouse

Redis

Kafka

Python

Ruby on Rails

React

TypeScript

Flutter

React Native

Android

iOS

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 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: Flutter, React Native, Android, iOS

The Role

We are looking for strong engineers with experience and interest in designing, building, and maintaining the infrastructure that make up our adtech platform.

You might be a fit if

• You have maintained or operated serious systems in production at scale
• You are detail-oriented and care about performance
• You enjoy diving deep into problems and owning the platform layer that powers our product
• You enjoy experimentation, measuring, and creating reliable systems
• You want to own a breadth of systems