Principal AI Engineer (AdTech)

TL;DR

Principal AI Engineer (AI/AdTech): Designing and executing agentic workflow systems that bridge platform APIs and AI-powered experiences with an accent on LLM infrastructure and API design. Focus on building MCP servers, scenario evaluation frameworks, and scalable tool discovery systems.

Location: Hybrid: Must be based in Los Angeles, CA, Boulder, CO, New York, NY, or St. Petersburg, FL

Salary: $175,000 – $200,000 + Equity

Company

A tech-first measurement company transforming how advertising is valued, bought, and sold using currency-grade big data and AI.

What you will do

• Design and operate AI infrastructure and universal tool layers supporting both customer and internal workflows.
• Lead the development of scenario evaluation frameworks, including golden scenario design and automated CI/CD evaluation pipelines.
• Architect efficient tool discovery systems using deferred loading, semantic filtering, and categorization for multi-step agentic workflows.
• Partner with engineering teams to negotiate and promote API-first designs for programmatic and agentic consumers.
• Own the full SDLC of new Agent APIs from design through production, testing, and releases.
• Serve as the internal expert on LLM tooling and agentic patterns by facilitating weekly AI office hours.

Requirements

• 8+ years of software engineering experience, with 3+ years in AI/ML infrastructure, LLM platform engineering, or agentic systems.
• Deep hands-on experience with LLM APIs (Anthropic, OpenAI) and multi-step agent orchestration.
• Strong background in resource-based API design and building developer-facing platform APIs at scale.
• Proficiency in Golang, Python, and SQL.
• Experience designing and operating evaluation frameworks for non-deterministic systems.
• Strong cross-functional collaboration skills and ability to produce high-quality technical documentation.

Nice to have

• Familiarity with the AdTech and media measurement landscape (linear TV, OTT, CTV, digital video).

Culture & Benefits

• Inclusive and comprehensive medical, dental, and vision insurance.
• 401(k) with matching, HSA, and FSA.
• Discretionary and flexible PTO plus Spring, Summer, and Winter company breaks.
• Paid Maternity and Parental Leave for all family additions.
• Cell phone and wifi reimbursement along with commuter benefits.