918: Extreme Native Perf on the Web with Superhuman

Wes and Scott talk with Loïc Houssier about how Superhuman builds lightning-fast, delightfully-designed email software. They dig into engineering philosophy, offline-first architecture, local databases, AI-powered productivity, and what it takes to create tools that people love.

Show Notes

• 00:00 Welcome to Syntax!
• 03:05 Inside Superhuman and Loïc’s role
• 06:49 Is Superhuman native? What’s the tech stack?
• 08:16 How Superhuman approaches product design and speed
• 12:17 Local-first architecture – Sync, storage, and performance
  • Realm
• 13:46 Vector search, AI, and privacy considerations
• 18:12 How the team ships fast and stays focused
• 21:27 Rethinking email for the future
• 26:54 Brought to you by Sentry.io
• 27:19 How calendar integration and smart features work
• 29:54 Where new ideas come from
• 31:54 Will there ever be a true dark mode?
• 33:02 Are people actually using keyboard shortcuts?
• 36:42 How shortcuts work and the role of the command palette
• 41:28 Engineering for speed – Costs and trade-offs
• 43:32 How Superhuman’s sync engine works
• 46:09 What code runs locally and what runs on the server?
• 46:51 How Superhuman handled the Google and Cloudflare outage

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