Svelte, Node, Vercel, Supabase/Postgres, Stripe, WandB, Amplitude, Sentry, ConvertKit, Mailgun, Slack, Discord, Google, ZenDesk, Miro, Figma, Clerky, Mercury, Xero, and Pilot soon. We have a bit of AWS stuff.
Vercel's instant previews are particularly great, and Svelte's ergonomics I like more than React. Svelte's SSR stuff seems cool but I am not 100% convinced yet we're leaning static enough.
I also think we're doing laps on anyone who isn't using ChatGPT/CoPilot... those poor lost souls.