A deep dive into SpacetimeDB's TypeScript SDK and how to wire it into a Next.js 15 App Router application for live visitor tracking and realtime features.
3 min readCurrent systems
Active work,
live signals, and writing.
Featured builds, the latest ranked signal, and recent writing — all in one place.
Featured build
MAINFRAME
Open-source bash stdlib for AI agents. Signals systems-level engineering range. Shows open-source authorship.
Pure bash runtime · Agent working memory primitives
Latest ranked signal
These two founders left Goldman and Meta to build voice AI for markets everyone else overlooked
The startup's own stack for Africa and Middle East is now handling more than 17,000 calls per day.
TCAI · 39m ago · score 56
Publishing system
Building Realtime Apps with SpacetimeDB and Next.js 15
A deep dive into SpacetimeDB's TypeScript SDK and how to wire it into a Next.js 15 App Router application for live visitor tracking and realtime features.
3 min read · spacetimedb · next.js
Open-source ecosystems
Projects I support
Small but important signal: I contribute to and support AI-native developer tooling beyond my own products.
✦ Selected Work
Systems I've Built
Ranked signal feed
Full feed →TC AI· 39m ago↑ RISING
These two founders left Goldman and Meta to build voice AI for markets everyone else overlooked
56
aitechTC AI· 40m ago↑ RISING
Publishers will be able to opt out of AI Search, thanks to new regulation
56
aitechVERGE· 8m ago↑ RISING
PlayStation is getting back to what it’s good at
42
techsystemsVERGE· 39m ago↑ RISING
Supernatural isn’t dead after all
42
techsystemsHF· 2h ago↑ RISING
Direct Preference Optimization Beyond Chatbots
64
airesearchWIRED· 39m ago↑ RISING
Greg Bovino Was the Star at a European Remigration Conference
40
tech✦ /now
What I'm Doing
Right Now
Building
ACTIVE
PropertyJunk.com — junk removal SaaS platform
ACTIVE
TaxScout.app — commercial real estate tax optimization
WIP
MAINFRAME — open source bash stdlib expansion
WIP
toddwatts.dev — this site
Reading
01Attention Is All You Need (re-read)
02The Pragmatic Programmer — 2nd ed.
03Designing ML Systems — Chip Huyen
Watching
▶
Andrej Karpathy
Neural nets: Zero to Hero
▶
Lex Fridman
Sam Altman ep.
▶
ThePrimeagen
Rust streams
My Setup
EditorVS Code + Claude Code
AIClaude Sonnet 4.5, Pi
RuntimeBun 1.2
DeployVercel






