Founding Engineer

Apply on YC · Original job listing

• Role: Engineering / Full stack
• Experience: Any (new grads ok)
• Visa: US citizen/visa only

About Ploy

Ploy is an agentic marketing platform that turns your website into your company's main growth engine. We deploy swarms of marketing and web design agents that monitor your site and proactively launch campaigns, content, and optimizations — giving companies the on-demand infrastructure of a growth team.

Ploy is founded by Bryant Chou, the co-founder and former CTO of Webflow, where he spent 12+ years building the core product, CMS, and hosting that now power ~1.5% of the internet.

We're a small, senior team based in San Francisco and backed by Y Combinator and other Tier 1 investors.

What you'll work on

The surface area is wide. You'll touch some mix of:

• Multi-agent systems that plan, execute, and learn from websites and growth channels in production — orchestration, memory, evals, and everything it takes to keep them reliable.
• The infrastructure that lets those agents make changes to live sites safely at scale — previews, diffs, rollbacks, performance guardrails.
• The primitives and interfaces customers use to direct the agents themselves.
• The feedback loops that make the product get smarter about a customer's business the longer it runs.

Who we're looking for

We care much more about what you've actually built than where you've worked, but some signal that tends to line up well:

• You've built something from 0 to 1 and thrive in ambiguity.
• You're comfortable going deep on any part of the stack — frontend, backend, infra, or ML/agent systems — and have strong taste in at least one.
• You've worked with LLMs in production, or you're hungry to.