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
Meta is reportedly developing an AI pendant
Meta seems to be making big bets on AI-powered hardware.
TCAI · 8m 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· 8m ago↑ RISING
Meta is reportedly developing an AI pendant
56
aitechTC AI· 38m ago↑ RISING
I put Google’s 24/7 AI assistant Gemini Spark to work, and it’s actually pretty useful
56
aitechLOB· 1h ago↑ RISING
NixOS 26.05 released
62
devsystemsVERGE· 8m ago↑ RISING
Welcome to Night Vale host Cecil Baldwin shares his tech pet peeves
42
techsystemsVERGE· 48m ago↑ RISING
Microsoft is threatening legal action for disclosing exploits
42
techsystemsHN· 2h ago↑ SIGNAL
Anthropic surpasses OpenAI to become most valuable AI startup
26
⬆ 250aisystems✦ /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






