Founding AI Engineer

tl;dr:
Why choose Flint?

⚡We’re winning quickly.

• We’re backed by Accel, by the same partner who led the series A for Scale, Vercel, and Sentry. We launched out of stealth 2 months ago (Tech Crunch), and are already powering pages that generate hundreds of thousands of dollars in pipeline. Also recently featured on CNBC.

⚡We’re drowning in demand.

• Flint has thousands of companies on our waitlist with more coming inbound every day. The market has spoken. We're growing our team so we can stop turning away customers.

⚡Recognized names that turn heads.

• We’ve earned the trust of customers like Cognition, Modal, Reducto, and Tandem + more we don’t publicly reference. Our new gong has been put to great use!

About Flint:
Autonomous websites

Flint is defining the next generation of websites: ones that can constantly build and optimize themselves based on visitor behavior and market changes. Today, we deliver on-brand landing pages on your domain fast, without any rebuilds or engineers. We are backed by Accel, Sheryl Sandberg (former Meta COO)'s venture fund SBVP, and Neo.

The vision

Sandberg instantly understood Flint’s vision. “I was sharing how it took (me) five teams three months to build one A/B test just to increase conversion by 10% on our Google ad,” Lim said. “And then she stopped me, [and] said, ‘Michelle, it was 140 people at Meta who had to do this’.” — Tech Crunch

Imagine a world where your website launches new pages, tests creative, and optimizes performance entirely autonomously. Just as autonomous vehicles respond to real-world inputs like road conditions and traffic patterns, Flint-powered websites respond to external signals such as competitive shifts, user behavior, and trending search queries.

The team

“One of the most talent-dense AI startups... each member of the early Flint team has a track record, and as a team, they perform like athletes. Amazing to watch.” - Dan Levine, Accel

Flint is led by co-founders Michelle Lim, Engineer #1 turned Head of Growth and Product at Warp, and Max Levenson, engineering leadership at autonomous vehicle startup Nuro, then Engineer #2 at Vooma (YCS
23).

Every single member of the Flint team has been a founding engineer / founder. Early stage best practices are in our team’s DNA. Because of that, our team knows how to catalyze hockey stick growth, but just as critically, how to navigate it sustainably to create $XB valued companies. After all, we’ve done it before.

We are alums of Netflix, Splunk, Scale, Carrot, and Shepherd (YC W21), and work together in-person out of historic Jackson Square.

The product

Companies have used Flint to hit goals like….

• Ranking #1 on AI answer engines like ChatGPT, Perplexity and Google AI Overview

• Driving 50% higher ad conversion rates on Google Ads months ahead of schedule

• Generating hundreds of thousands of dollars in pipeline revenue

The first version of Flint's autonomous website platform produces on-brand landing pages from content briefs and prompts in minutes. Flint ingests a company's existing design system (components, brand guidelines, and visual tokens), then generates fully-coded landing pages that live on the customer’s top-level domain, on a subfolder at URLs like

The role

• Designing and implementing production-grade agentic systems that power web experiences and marketing workflows, leveraging advanced prompt engineering and multi-agent architectures to do so

• Architecting and optimizing RAG (Retrieval-Augmented Generation) systems with context engineering

• Strengthening our engineering processes through robust evals, observability, and testing

• Developing and maintaining the core application across frontend, backend, and infrastructure

• Shaping our technical vision and leading architectural discussions. You'll make foundational decisions that influence both Flint's technical architecture and engineering culture.

• Creating and testing prototypes to gather rapid feedback from users

Basic qualifications:

• You are a product-first engineer

• You have built and deployed AI products that real users depend on

• You have extensive hands‑on experience with prompt engineering, context optimization, and model fine‑tuning

•…