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 Janet? (2023)
Comments
LOBSTERS · 1h ago · score 62
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
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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 →LOB· 1h ago↑ RISING
Why Janet? (2023)
62
devsystemsSIMON· 2h ago↑ HOT
Pasted File Editor
68
aidevLATENT· 2h ago↑ HOT
[AINews] NVIDIA Cosmos 3, Nemotron 3 Ultra, and RTX Spark
67
airesearchWIRED· 1h ago↑ RISING
Office Depot Coupons: Save With Promo Codes in June 2026
40
techdevWIRED· 1h ago↑ RISING
Layla Sleep Coupon: Save Up to $600 in June 2026
40
techdevSIMON· 9h ago↑ HOT
Hackers Simply Asked Meta AI to Give Them Access to High-Profile Instagram Accounts. It Worked
68
aidev✦ /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






