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
Trump's Federal Gas Tax Holiday Isn't Likely to Bring Down Prices
Reducing the fee will only have a marginal impact on prices while depriving the government of revenue to maintain roads.
WIRED · 4m 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· 4m ago↑ RISING
Trump's Federal Gas Tax Holiday Isn't Likely to Bring Down Prices
40
techaiMIT TR· 1h ago↑ RISING
The world is on track to miss its health targets
57
researchaiMIT TR· 1h ago↑ RISING
How Chinese short dramas became AI content machines
57
researchaiWIRED· 34m ago↑ RISING
A Woman Was in the US Legally. She Was Deported Anyways
40
techLOB· 3h ago↑ RISING
PyCon US 2026 Typing Summit Recap
62
devsystemsLOB· 7h ago↑ RISING
Prolog Basics Explained with Pokémon
62
devsystems✦ /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






