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
Quoting Georgi Gerganov
<blockquote cite="https://news.ycombinator.com/item?id=48555993#48557304"><p>I can 100% attest to the fact that Qwen3.6-27B is a very capable local model for coding tasks. Over the last month and a half I've been using it almost daily, either on
SIMONW · 43m ago · score 68
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 →SIMON· 43m ago↑ HOT
Quoting Georgi Gerganov
68
aidevTC AI· 55m ago↑ RISING
SpaceX is public: Everything you need to know post-IPO
56
aitechVERGE· 16m ago↑ RISING
Everything you need to know about Prime Day 2026
42
techsystemsWIRED· 21m ago↑ RISING
Best Robot Vacuum of 2026: Shark, Eufy
40
techTC AI· 1h ago↑ RISING
DOJ claims xAI’s unpermitted gas turbines are a matter of ‘national, economic, and energy security’
56
aitechVERGE· 38m ago↑ RISING
Nothing’s Ear (a), our favorite budget earbuds, are cheaper than ever ahead of Prime Day
42
techai✦ /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






