21st

UI building blocks for the agentic internet

San Francisco

3 employees

Seed · $500K

About 21st

21st.dev is the largest React component registry for AI applications, used by 2M developers
We provide the building blocks to create agent-powered apps: UI components, agent templates.

Open positions (2)

Founding GTM Lead

First Growth Hire (Intern)

Internship

San Francisco, CA

$3k – $4k

Company details

Team Size3

LocationSan Francisco

Funding

Total raised

$500K

Last stage

Seed

Investors

Y Combinator

Founders

Sergey Bunas

CS dropout. Senior Software Engineer at Deel (W19). Built Perplexity before Perplexity (Suggesty, 2022 — #1 Product Hunt, featured in Google's internal newsletter). Solo-built a Figma competitor pre-AI (Stage, 10K users). Cambridge AI hackathon winner (solo)

Serafim Korablev

One of the first full-time vibe-coders (since October 2023). Co-founder of 21st.dev, a UI components registry with over 1m users. Previously co-founded Rork.com (then a web app builder for Next.js), the first Telegram-native memecoin launchpad (multi-million exit), and Via, a cross-chain crypto routing protocol with $1.5B GTV backed by Naval, Safe, Sandeep, and others. Passionate about design and basketball.

What happens next.

No applications, no recruiter spam. Just the intro.

Confirm the fit

A few questions to make sure this role is the right shape for you. Two minutes.

I pitch you to the company

I write the intro, send it to the founder, and handle the back-and-forth.

A meeting lands on your calendar

If they’re a yes, I book the chat. You show up — that’s the whole job-hunt.