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
‘Reservation Hijacking’ Scams Target Travelers. Here’s How to Stay Safe
The hotel staffer who calls you with an urgent request for payment isn’t necessarily who they say they are.
WIRED · 14m 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· 14m ago↑ RISING
‘Reservation Hijacking’ Scams Target Travelers. Here’s How to Stay Safe
40
techLOB· 2h ago↑ RISING
AI is Breaking Two Vulnerability Cultures
62
devsystemsLOB· 3h ago↑ RISING
Relational modeling and APL
62
devsystemsHN· 6h ago↑ SIGNAL
Show HN: Building a web server in assembly to give my life (a lack of) meaning
27
⬆ 123systemsTC AI· 11h ago↑ RISING
So you’ve heard these AI terms and nodded along; let’s fix that
56
aitechHN· 4h ago↑ SIGNAL
Debian must ship reproducible packages
13
⬆ 25tech✦ /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






