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
"They screwed us": Personality clashes sent Anthropic's models offline
<p><strong><a href="https://www.axios.com/2026/06/15/anthropic-white-house-fable-mythos">"They screwed us": Personality clashes sent Anthropic's models offline</a></strong></p> Lots of "source familiar with the administration's t
SIMONW · 1h ago · score 68
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 →SIMON· 1h ago↑ HOT
"They screwed us": Personality clashes sent Anthropic's models offline
68
aidevTC AI· 1h ago↑ RISING
Cybersecurity vets protest ‘dangerous’ US government ban on Anthropic’s most powerful models
56
aitechMIT TR· 1h ago↑ RISING
This man with ALS is “the first power user” of a brain implant that lets him speak
57
researchaiVERGE· 43m ago↑ RISING
Roblox exec says ticking a box for age verification is ‘not enough anymore’
42
techTC AI· 2h ago↑ RISING
Salesforce acquires AI customer service platform Fin for $3.6 billion
56
aitechLOB· 3h ago↑ RISING
Xavier Leroy's new book on Control Sturctures in Programming
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






