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
Why Video Agent models are next — Ethan He, xAI Grok Imagine
Inside xAI: Building Grok Imagine in 3 Months, Videogen vs World Models, and why Grok Imagine is so underrated. For the first time, we do a deep dive with the guy who led it!
LATENT · 40m ago · score 67
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 →LATENT· 40m ago↑ HOT
Why Video Agent models are next — Ethan He, xAI Grok Imagine
67
airesearchHF· 36m ago↑ RISING
Introducing Mellum2: A 12B Mixture-of-Experts Model by JetBrains
64
airesearchTC AI· 21m ago↑ RISING
This AI weather startup is out-forecasting government agencies
56
aitechTC AI· 1h ago↑ RISING
DuckDuckGo makes its ‘no-AI’ search engine easier to access as its traffic booms
56
aitechHF· 2h ago↑ RISING
Beyond LLMs: Why Scalable Enterprise AI Adoption Depends on Agent Logic
64
airesearchLOB· 2h ago↑ RISING
Should you normalize RGB values by 255 or 256?
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






