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
Republicans Gleefully Celebrate Midterms Chaos in Maine
Political operatives in Trumpworld hope that US Senate candidate Graham Platner stays in the race as long as possible.
WIRED · 7m ago · score 40
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 →WIRED· 7m ago↑ RISING
Republicans Gleefully Celebrate Midterms Chaos in Maine
40
techaiLOB· 2h ago↑ RISING
A bug which only affected left-handed users
62
devsystemsARS· 1h ago↑ RISING
US rare earths flow to Asia as domestic demand is slow to emerge
58
techsystemsVERGE· 24m ago↑ RISING
The whole Pixel line could get more expensive this year
42
techaiVERGE· 24m ago↑ RISING
Gaming laptops are too expensive right now, but this one’s a good value
42
techsystemsCF· 2h ago↑ RISING
Introducing Meerkat: an experiment in global consensus
60
systemsweb✦ /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






