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
The token bill comes due: Inside the industry scramble to manage AI’s runaway costs
"The whole conversation shifted from tokenmaxxing and 'go fast' to 'we need guardrails, how do we control this?'"
TCAI · 1h 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· 1h ago↑ RISING
The token bill comes due: Inside the industry scramble to manage AI’s runaway costs
56
aitechWIRED· 6m ago↑ RISING
13 Environmentally Conscious Packing Tips for Your Next Vacation
40
techWIRED· 6m ago↑ RISING
How to Spot Greenwashing Claims When You Travel
40
techaiVERGE· 41m ago↑ RISING
New York lawmakers pass one-year ban on new data centers
42
techsystemsLOB· 2h ago↑ RISING
The Empty Field That Wasn't: GPS Broadcasts a Numbers Station
62
devsystemsCF· 3h ago↑ RISING
Your AI bill is out of control. Cloudflare can fix it now.
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






