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
A Professional Bike Fitting Will Make You Want to Ride Even More
Getting an assessment and suggestions from a pro puts you in the right position and gets you as comfortable as can be. If you ride a lot, it's worth the investment.
WIRED · 10m 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· 10m ago↑ RISING
A Professional Bike Fitting Will Make You Want to Ride Even More
40
techsystemsWIRED· 10m ago↑ RISING
How to Buy a Bike That’s the Right Size for You
40
techaiLATENT· 2h ago↑ HOT
[AINews] AI Engineer World's Fair — Autoresearch, Memory, World Models, Tokenmaxxing, Agentic Commerce, and Vertical AI Call for Speakers
67
airesearchLOB· 3h ago↑ RISING
I Do Not Recommend Bitwarden
62
devsystemsLOB· 5h ago↑ RISING
The Architect's Instinct
62
devsystemsHN· 5h ago↑ SIGNAL
Ask.com has closed
26
⬆ 131systems✦ /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





