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Software Engineer - Backend

Koah Labs

New York, NYFull-time$180–250K/yrPosted 5mo agoVerified open 1w ago
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At a glance

Compensation
$180–250K/yr
Location
New York, NY
Schedule
Full-time
Work Authorization
Not specified

Job overview

Koah Labs is hiring a Software Engineer - Backend. Koah Labs is building an AI-native ad network to help publishers monetize and advertisers reach audiences without sacrificing speed, UX, or privacy. The small San Francisco‑based team seeks a backend engineer who will ship code, own foundational systems, and collaborate closely with product and data science to turn ambiguous problems into measurable outcomes.

Key focus areas include Build scalable data models that support multiple impressions for an ad request, Design abstractions that enable experimentation and new format shipping, and Build a low‑latency frequency capping system to improve user experience.

Preferred (not required): Terraform, AWS, Loki, and Grafana.

Skills & qualifications

RequiredNice to have

Skills

TerraformAWSLokiGrafanaTempoMimirTailscaleCloudflarePostgreSQLClickHouseRedisKafkaPythonRuby on RailsReactTypeScriptFlutterAndroidiOSDebuggingPerformance OptimizationDetail OrientedCreate Good AbstractionsA/B TestingMeasuringCreating Reliable SystemsCreating Good AbstractionsOwnership of Foundational SystemsWorking Closely With ProductWorking Closely With Data ScienceTurning Ambiguous Problems Into Measurable Outcomes

Full 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

Example projects

  • Build scalable data models that support multiple impressions for an ad request allowing us to align publisher and advertiser interests

  • Design abstractions that allow us to experiment and ship new formats that allow for a flexible way of tracking engagement events

  • Build a low-latency frequency capping system to improve an end user's experience and prevent ad fatigue

  • Create schemas to represent high-volume ad bidding with ad exchanges to increase the diversity of the ad demand on platform

  • Evolve our real-time auction and ad-decisioning systems to improve publisher, advertiser, and user outcomes

You might be a fit if

  • You like debugging and optimizing performance

  • You are detail oriented and like to create good abstractions that others rely on

  • You enjoy experimentation, measuring, and creating reliable systems

  • You want ownership of foundational systems

  • You enjoy working closely with product and data science to turn ambiguous problems into measurable outcomes

You've read the whole posting — now see how you match it.

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