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
Japanese Gothic is a gorgeously grotesque ghost story
I'll give the usual caveat: The horror novel Japanese Gothic is best experienced going in with as little information as possible. Content warnings for graphic gore, scenes of domestic violence, self-harm, and mental illness. If you're okay with that,
VERGE · 32m ago · score 42
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 →VERGE· 32m ago↑ RISING
Japanese Gothic is a gorgeously grotesque ghost story
42
techsystemsLOB· 3h ago↑ RISING
The User Doesn't Care - But you should
62
devsystemsVERGE· 1h ago↑ RISING
The Virtual OS Museum lets you relive over 600 operating systems right on your desktop
42
techsystemsHF· 3h ago↑ RISING
Sponsors especially OPENAI CODEX voucher usage for codex - openAI challange
64
airesearchHN· 2h ago↑ RISING
LLMs are eroding my software engineering career and I don't know what to do
37
⬆ 308aiLOB· 8h ago↑ RISING
To my students
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






