Sam Willis

Building Agents & composable sync primitives @ElectricSQL.
Sync Engines, Durable Streams & AI.
Started co-creator of @tan_stack DB.

[Sam Willis @samwillis]

My overriding thought going into 2026:
Problems you thought were out of reach no longer are.
Pick a problem 100x harder than you thought possible to tackle alone, and run with it.
Start now. AI will catch up and make it possible.

[Sam Willis @samwillis]

@AlemTuzlak @tan_stack And what an incredible year! 🔥🚀

[Sam Willis @samwillis]

@appfactory @boristane Or put the database in a sandbox!

[Sam Willis @samwillis]

@BenjDicken I think it's very doable, but it misses the key thing that makes Postgres attractive - the extension ecosystem.
I believe it's more compelling to take Postgres as a base and fix its issues.
I think swapping parts to Rust can also make a lot of sense, but doing it incrementally.

[Sam Willis @samwillis]

I need GPT5.6 to launch on Monday...

[Sam Willis @samwillis]

What thinking level are you using Fable at?
I'm beginning to think that setting it to "Low" is most optimal. It moves much faster and creates a better feedback loop, without really loosing any intelligence.
Kind of wish there was an easy way to combine with GPT5.5 though.

[Carlos Baquero @xmal]

Can we merge latent spaces as we merge CRDT replicas? It works for two replicas with a CRDT-like design, and we can do federated querying without exposing the query to the LLMs that process the source data. Abstract and link in thread.

[Sam Willis @samwillis]

If you've been waiting for a vote of confidence in TanStack Router (with SSR) this is it!
Love seeing awesome people succeed, huge moment for @tannerlinsley and the TanStack team 🚀🎉🫶

[Tanner Linsley @tannerlinsley]

👀 TanStack powered @X ya'll

[Sam Willis @samwillis]

@tannerlinsley @X 🔥

[Tanner Linsley @tannerlinsley]

👀 TanStack powered @X ya'll

[Sam Willis @samwillis]

There are a few people on here who are awesome curators, Oskar is one of them. Instant follow of anyone he retweets.

[Oskar Stålberg @OskSta]

This guy does some very good vikings. Would recommend a scroll

[Kyle Mathews @kylemathews]

new blog post: "Essential Until It Wasn't"

What we call programming today is not the same activity it was two years ago.

Implementation was essential complexity for 80 years and is now... gone.

This has happened many times before and probably will happen again.

[Sam Willis @samwillis]

@tantaman I've dropped a PR on your repo with a few tweaks.
Love what you are building, very cool architecture!
We're not far off in performance - you have given me a target to hit!

[Sam Willis @samwillis]

@tantaman No problem. I'm super excited to see what you're working on!

[Sam Willis @samwillis]

@tantaman Nice!
It looks like that repo is still private?

[Sam Willis @samwillis]

I've found the regression (my fault 😬) I'll post a write up later, but it's outside the query engine in the write path to collections. Accidental O(collection-size) rather than O(change-size).
Looks like we should have almost exactly the same numbers to yours.
I'm taking an educated guess your benchmark was roughly 100k issues, 100k users, 400k comments?

[Sam Willis @samwillis]

@tantaman Hey Matt, could you share the code? I'd love to dig in before you publish anything as it's certainly looking like there could be a bug or we have a regression.

[Kyle Mathews @kylemathews]

https://t.co/8KYoDpWmdf

[Valter Balegas @balegas]

🚀 New @DurableStreams rust release is out!
Comes with brand-new per-core epoll engine for live-tail SSE and memory improvements

Flat p99 latency, lower memory footprint per subscriber; increased write throughput.

Checkout the number👇