Building what's next (Interview)
Adam Stacoviak speaks with Resend founder and CEO Zeno Rocha about scaling an email platform to three million users and one hundred thousand paying customers. They explore the hidden architectural rewrite from Node.js to Go to handle batch concurrency, building infrastructure optimized for AI agents through standardized RFC rate limits and markdown endpoints, and defending free developer tiers against coordinated spam gangs.
- Resend scaled to three million users and 100,000 paying customers by sweating micro-interactions, but autonomous agents ignore the design details human developers love. Read →
- Resend reached 100,000 paying customers out of 3 million total registered accounts while keeping its free developer tier intact. Read →
- Resend discovered that Claude and ChatGPT were telling prospective buyers the platform was the most expensive email service on the market, despite offering competitive rates. Read →