Founding Senior AI Engineer

Posted Yesterday
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San Francisco, CA, USA
In-Office
Senior level
Artificial Intelligence • Information Technology • Professional Services • Financial Services
The Role
Owns the architecture, infrastructure, evaluation, and quality improvement of multi-channel AI marketing agents. The role develops measurable agent evaluation systems, feedback loops, SEO and GEO optimization, model strategies, and supporting data pipelines. It also involves hiring and leading the AI team as the startup grows, while partnering directly with the founder.
Summary Generated by Built In

Founding Senior AI Engineer — Agent Quality & Evaluation
On behalf of an early-stage startup · San Francisco, on-site · Full-time

The build: Our client is building multi-channel marketing agents across SEO, content, social, and search — and they want their first senior AI hire to own the quality and intelligence of those agents end to end. You'll work directly with the founder, shape agent architecture and eval systems, and build the AI team as it scales.

This is a first-senior-hire role. You set the standard for what "good output" even means — and make it measurable.

What you'll do

  • Improve agent output and content quality across Reddit, LinkedIn, X, and long-form articles — with evaluation systems that make quality measurable.
  • Improve SEO and generative engine optimization (GEO) performance.
  • Design feedback loops so agents learn from real-world results and performance signals at scale.
  • Own AI infrastructure, agent architecture, model strategy, and the data pipelines behind them.
  • Hire and lead the AI team as the org grows.

Requirements

What we're looking for

  • 3+ years building production ML or AI systems, with recent hands-on shipping of LLM products or agents.
  • Proven eval design and outcome-signal learning in domains like search, ranking, or recommendations.
  • Strong TypeScript (Next.js) and Python — you ship end to end and can do the data/eval work yourself.
  • Sharp judgment about output quality, and the ability to make it measurable and actionable.
  • Ownership experience in a startup or small team.
  • Search or ranking background — especially Google or AI answer engines. Bonus: leading AI lab or top research program, marketing/GTM exposure, or RL/recommender systems experience.


Skills Required

  • 3+ years building production machine learning or artificial intelligence systems
  • Recent hands-on experience shipping LLM products or AI agents
  • Proven experience designing evaluations and learning from outcome signals in search, ranking, or recommendation domains
  • Strong TypeScript and Next.js skills
  • Strong Python skills
  • Ability to ship end-to-end systems and perform data and evaluation work independently
  • Strong judgment about AI output quality and ability to make quality measurable and actionable
  • Ownership experience in a startup or small team
  • Search or ranking background, especially with Google or AI answer engines
  • Experience leading an AI lab or top research program
  • Marketing or go-to-market exposure
  • Reinforcement learning or recommender systems experience
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The Company
3 Employees
Year Founded: 2021

What We Do

Fruition Executive Search is a boutique executive search firm based in San Francisco. They specialize in sourcing high-caliber leadership talent across various industries, including Accounting, Finance, AI, Software, and Healthcare. Utilizing a dual approach of retained and contingent search, they connect organizations with C-suite and management professionals equipped to drive strategic direction, profitability, and digital transformation through human-centered leadership.

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