Join Fancysauce Inc. as the second engineer to architect the future of AI cost management. You will build an AI-native load balancer that optimizes enterprise AI stacks, surfacing high-ROI tools and dynamically routing model usage. Working alongside veteran founders with multiple exits, you will own product verticals end-to-end and ship daily.
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AI-Native Founding Engineer at Fancysauce Inc.
Fancysauce Inc. is looking for an AI-Native Founding Engineer to join their SF-based team and build the essential infrastructure for the agentic era. Founded by Harvard and Apple alumni with a track record of $30M+ exits and backed by Afore Capital and OpenAI angels, the company is solving the massive problem of unmanaged AI spend. As the second engineer, you’ll have a 'manager of one' mandate to architect agentic load balancers and observability tools. If you’re a full-stack builder who uses AI to multiply your own output and wants a founding seat at a high-velocity startup, this is your kitchen.
About this role
Role overview
About the company
Technology1-50 employees
Fancysauce.ai is a B2B solution that provides AI cost management capabilities, enabling companies to visualize, govern, and control their AI compute costs across every function while managing their AI capabilities and outcomes within budget constraints.
What you'll do
What you will do
- Design and implement end-to-end product verticals using agentic engineering principles to optimize model usage and AI ROI.
- Scale a high-performance stack comprising TypeScript, React, Next.js, and GCP while shipping new features multiple times daily.
- Collaborate directly with the CTO to define architecture, manage agent harnesses, and build mission-critical observability tooling.
Who you are
Who this is a fit for
- Has 3-5+ years of full-stack engineering experience, ideally within a high-growth startup or a fast-paced "0-to-1" environment.
- Exhibits mastery of AI-native workflows, using coding agents and LLMs as a force multiplier for productivity and quality.
- Demonstrates deep proficiency in TypeScript and React, with the ability to navigate infrastructure and DevOps across GCP and Postgres.
Why this role
Why this role is remarkable
- Join a proven founding team of Harvard and Apple alumni who previously scaled and exited Retain.ai for $30M.
- Directly influence a high-growth market by building the infrastructure layer for enterprise AI spend and agentic load balancing.
- Secure a founding seat with meaningful equity and a high-autonomy "manager of one" culture that biases toward rapid action.
Jack & Jill
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Meet Jack
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
How does this work?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If it’s a match and the company wants to meet you, they’ll make the intro. In the meantime, if you’d like, Jack will send you excellent alternatives.