Software Engineer - Platform

Koah Labs Inc.; New York, Northern (NY, KY); Hybrid; USD 120,000 - 180,000; Full time

Job summary

Koah Labs Inc. in San Francisco is seeking strong engineers to design, build, and maintain the infrastructure that powers our adtech platform. You will own core systems spanning Infra, Data, and Core App, focus on reliability and performance.

Join a tight-knit team shipping code across AWS, Terraform, PostgreSQL, Kafka, Ruby on Rails, React and TypeScript. You will prototype, observe, measure, and scale systems at rapid pace while owning the platform layer.

Qualifications

• Experience operating production systems at scale.
• Strong focus on performance and reliability.
• Willingness to own breadth of systems.
• Experience with observability and monitoring.
• Familiarity with AWS, PostgreSQL, Kafka is a plus.

Responsibilities

• Design, build, and maintain production infrastructure.
• Own platform layer powering our adtech product.
• Improve reliability, observability, and performance.
• Collaborate across infra, data, and core app teams.

Skills

Production systems

Performance optimization

Problem ownership

Deep problem solving

Observability

Tools

AWS

PostgreSQL

Kafka

Ruby on Rails

TypeScript

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