Founding Engineer

About the Role

Join an early-stage advertising technology team building an ad recommendation and serving platform for AI entertainment and mobile gaming. As a Founding Engineer, you will own systems that select and deliver relevant interactive ads in real time, working across data, machine learning, and production infrastructure.

What You'll Do

• Design and ship low-latency retrieval, ranking, and reranking systems that select campaigns and creative while balancing advertiser performance with user experience.

• Build data pipelines and feature infrastructure for continuous model training across clicks, installs, and conversions.

• Develop user and context representations from conversational signals, engagement history, device, location, session, and interaction data.

• Build cost-efficient serving infrastructure that meets sub-second latency requirements.

• Create generative agents that produce playable and video ad variants, and feed performance signals back into recommendation systems.

What We're Looking For

• Typically 0 to 3 years of experience, with hands-on experience shipping at least one machine learning or AI system to production.

• End-to-end experience building data architecture, feature pipelines, and serving infrastructure, in addition to developing models.

• Strong generalist engineering skills across backend systems, machine learning, and infrastructure, with experience using PyTorch.

• Experience with recommendation systems, ranking, or advertising technology is valuable.

• Active GitHub or side projects demonstrating work across backend, ML, and infrastructure.

• Interest in gaming, including experience with League of Legends or mobile games and rewarded ads.

• Consumer technology or advertising infrastructure experience is relevant.

Compensation & Benefits

Base salary: $200,000 to $250,000 annually. Visa sponsorship is not available.

Location

On-site in San Francisco, California, five days per week.