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
OpenAI unveils its first custom chip, built by Broadcom
Named Jalapeño, the new processor was designed specifically for the unique needs of OpenAI's inference systems.
TCAI · 10m 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· 10m ago↑ RISING
OpenAI unveils its first custom chip, built by Broadcom
56
aitechVERGE· 5m ago↑ RISING
8BitDo’s all-button controller gets a screen upgrade for customizations without an app
42
techsystemsVERGE· 5m ago↑ RISING
Zoox’s purpose-built robotaxi is getting a refresh
42
techsystemsTC AI· 1h ago↑ RISING
3 days left to save up to $190 on your TechCrunch Founder Summit 2026 pass
56
aitechWIRED· 20m ago↑ RISING
I've Built Countless Sets, and These Are the Best Prime Day Lego Deals (2026)
40
techsystemsWIRED· 52m ago↑ RISING
12 Best Prime Day Fitness Tech Deals (2026) Up to $250 Off
40
tech✦ /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






