Software Engineer, Early Career
At a glance
Mid-level Software Engineering role at Koah. San Francisco · full-time · $120,000–$160,000 base.
techroles summary, based on the employer's posting.
What you'll do
- Help shape the ad experiences people encounter across the network
- Build code for products used by millions, taking on more autonomy as you grow
- Lead important projects, make technical choices and contribute to product direction
- Work with design, product and data colleagues to create advertising experiences
What you bring
- You communicate proactively with both technical and non-technical partners
- You can move across the stack and take on unfamiliar work amid ambiguity
- You break problems into parts and test your ideas
Who this fits
This role suits someone who enjoys in-person collaboration, quick feedback and end-to-end responsibility. The position is onsite in San Francisco. The take-home assessment is optional, though completing it can help prioritize your application.
From the employer
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: iOS, Android, Web, Flutter, React Native
In this role, you will:
Help shape core ad experiences and shape how people see ads across our ad network
Tackle meaningful challenges with increasing autonomy, crafting code that millions of users will experience
Take ownership of projects that matter, make critical technical decisions, and contribute your unique perspective to our product vision.
Work alongside passionate experts across design, product, and data to create the advertising experience in this new era
You might thrive in this role if you:
Enjoy proactively communicating with both technical and non-technical stakeholders
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
Want to stand out?
We receive a high volume of applications, and we want to give everyone a fair chance to show us what they can do beyond their resume.
We’ve put together a short, optional take-home assessment. It’s not required to apply, but completing it is highly encouraged and will help us prioritize reviewing your application.
Complete the optional take-home assessment
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Software Engineering$120k+
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