Building what's next (Changelog Interviews #687)

This week I’m talking with Zeno Rocha, CEO of Resend, about scaling “boring” email to 3 million users, the secret Go rewrite behind it, and building for agents. We cover pricing.md, MCP, spam gangs, and why Resend keeps what’s next for email. Join the discussion Changelog++ members save 10 minutes on this episode because they made the ads disappear. Join today! Sponsors: WorkOS – Auth for CLI with AuthKit from WorkOS — Bring secure browser-based login to your terminal apps using the OAuth Device Flow, with the same polished AuthKit experience plus SSO, MFA, and passkeys. Learn more at WorkOS.com and AuthKit.com Buildkite – You deserve better CI. Buildkite is engineered for frontier scale and trusted by the teams setting the pace. Coder.com – Secure environments where devs and agents work in parallel. Open by design. Secure by default. Fly.io – The home of Changelog.com — Deploy your apps close to your users — global Anycast load-balancing, zero-configuration private networking, hardware isolation, and instant WireGuard VPN connections. Push-button deployments that scale to thousands of instances. Check out the speedrun to get started in minutes. Featuring: Zeno Rocha – Website, GitHub, X Adam Stacoviak – Website, GitHub, LinkedIn, Mastodon, X Show Notes: Resend Resend Inboxes Resend CLI Dracula Dracula Pro Something missing or broken? PRs welcome!