AI-Native Founding Engineer at Fancysauce Inc. - Fast-growing AI cost management startup

**This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers.**
She will pick the best candidates from Jack's network.
The next step is to [speak to Jack](https://jackandjill.ai/jobs/ai-native-founding-engineer-at-fancysauce-inc-cfd5a42d-34d9-4d58-b59c-4ae7cac1a281?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_cfd5a42d-34d9-4d58-b59c-4ae7cac1a281).

• Title:** AI-Native Founding Engineer at Fancysauce Inc. - Fast-growing AI cost management startup
  

Job Title
AI-Native Founding Engineer
Salary
Not Disclosed + Equity
Company Description
Fancysauce Inc. - AI-native load balancer for enterprise cost management
Job Description
Join Fancysauce as our second engineer and partner with a proven founding team of Harvard grads and Apple alumni. You will own core platform verticals end-to-end, building agentic recipes that help companies optimize AI stacks. This high-autonomy role requires shipping fast in an AI-native environment to prevent company-compounding AI bills.
**Location:**
San Francisco, USA
Why This Role Is Remarkable

• Exceptional founding team with a history of success; the CEO previously scaled revenue to $100M+ with four successful exits, including Retain.ai ($30M raised).
• Backed by tier-A investors including Afore Capital and strategic angels from industry leaders like OpenAI, Gemini, and Baseten.
• Rare opportunity to join at the pre-seed stage as the second engineer, gaining massive equity and the ability to define agentic engineering principles from scratch.
  

What You Will Do

• Architect and deploy end-to-end product verticals, shipping high-quality code multiple times daily across the frontend, backend, and infrastructure.
• Design and scale agentic engineering harnesses and observability tools that dynamically route model usage and optimize enterprise AI resources.
• Act as a "manager of one" to define, plan, and execute technical roadmaps while collaborating directly with the CTO in a high-speed SF kitchen.
  

The Ideal Candidate

• 3-5+ years of experience in full-stack engineering roles, with deep fluency in TypeScript, React, SQL, and a strong comfort level with Python.
• An AI-native builder who actively leverages agentic engineering principles and AI coding tools to multiply their own productivity and output quality.
• Proactive problem-solver with a high tolerance for ambiguity, capable of digging into GCP logs one moment and architectural design the next.
• Who are Jack & Jill?**
  

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.
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.
**Next steps**
Step 1. Visit **[our website](https://jackandjill.ai/jobs/ai-native-founding-engineer-at-fancysauce-inc-cfd5a42d-34d9-4d58-b59c-4ae7cac1a281?utm_source=linkedin&utm_medium=job_post&utm_campaign=featured_role_cfd5a42d-34d9-4d58-b59c-4ae7cac1a281)**.
Step 2. Click **'Talk to Jack'**.
Step 3. Talk to Jack so he can understand your experience and ambitions.
Step 4. Jack will make sure Jill (the AI agent working for the company) considers you for this role.
Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction.
Step 6. If not, Jack will find you excellent alternatives. All for free.
**We never post fake jobs**
This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network.
Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description.
We appreciate this can make them look a bit suspect, but there isn't much we can do about it.
Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.