Jeff Posnick
@jeff.posnick.org
Working on developer experience & tooling at Bloomberg. https://jeffy.info
Unsolicited, unpaid-for suggestion from a guy who hates politics podcasts: I just really, really love Election Profitmakers. It’s hosted by @jonkimball.bsky.social and Get Your War On’s David Rees. It used to be about prediction markets before that became a disease. Now it’s just very funny.
Episode 383: Could The $5,000 Trump Dividend Help Americans' Pain At The Pump? Our Experts Weigh In.
Election Profit Makers · Episode
open.spotify.com
I wrote about what I've been up to with my new programming language! Zena targets WebAssembly GC, with a TypeScript-like syntax, sound type system, and lots of cool features like pattern matching, async cancellation, borrow checking, WASI integration, and more! justinfagnani.com/2026/09/09/z...
Zena: A new Wasm-first programming language
justinfagnani.com
Nice teardown of how the Modern Web Guidance skill actually works by @nucliweb.net joanleon.dev/en/modern-we... A lot of thought went into being as token-efficient as possible!
A skill that knows nothing: the architecture of Modern Web Guidance | Joan León
Modern Web Guidance doesn't keep the knowledge in the skill, it teaches the agent to retrieve it. Local semantic search with MiniLM and TensorFlow.js, guides with their own grader, and empirical calib...
joanleon.dev
We're hiring a Technical Product Manager for Web Platform & Frameworks infrastructure at Bloomberg in New York. You'll be working with me and @jonkuperman.com plus a whole bunch of folks excited by web technologies ✨ Feel free to DM with questions. bloomberg.avature.net/careers/JobD...
Technical Product Manager - Web Platform & Frameworks - CTO Office
bloomberg.avature.net
I want to see more @puzzmo.com accounts when I'm on Bluesky! Help me juke my stats, if you've hooked it up and got the label, but don't have a paid account; DM me your profile link over the next week and I'll gift you a year's sub (The link is in the dropdown when you click on your nav avatar)
I'm biased, but Stricli really is a great choice if you're in the market for a TypeScript-y CLI framework.
Michael Molisani@molisani.bsky.social · 2mo ago#stricli 1.3.0 is out now, featuring "integrations" bloomberg.github.io/stricli/blog...
#stricli 1.3.0 is out now, featuring "integrations" bloomberg.github.io/stricli/blog...
Supporting Integrations | Stricli
Introducing a new way to extend Stricli applications with enhanced functionality. Integrations allow developers to add new features to their applications without modifying the core application configu...
bloomberg.github.io
If you’re a software engineer, designer, or technologist who wants to help make City government work better and faster, apply to join our PIT crews at nyc.gov/pitcrew.
I've been experimenting with having `ts-blank-space` use the (unstable) TypeScript-go JS API. At first it was ~60% slower than using the TS 6 API, but with a bit of investigation, a bug fix, and a small refactor to use different API calls it is now ~24% faster! Draft PR: github.com/bloomberg/ts...
This is seriously cool stuff, no more JS to OOO stream, in chrome 150! (the script in there is the SW registration)
Barry Pollard@tunetheweb.com · 3mo agoThe first part of Declarative Partial Updates (`<template for>` out-of-order HTML) is now available, unflagged, in Chrome 150!! developer.chrome.com/release-note... The second part (the new JS setting APIs, include the streaming ones) we're still working on the spec side, but maybe for Chrome 152?
Bloomberg uses a lot of C++ & contributes to the standard as well as various industry conferences and libraries. I’m looking for an experienced engineer to join a distributed systems team in New York working on our core Deployment Infrastructure for the Bloomberg Terminal 🗽 🧵
This is a place where every day you wake up, you could experience everything from a basketball player crashing into our old mayor to a person who's celebrating a new business that's opening
"It’s fortunate that LLMs are not conscious," Ted Chiang writes, "or else the actions of the big AI firms would be even more scandalous than they already are." theatln.tc/D4SzWQfW
great post by the authors about how they code so good. I’m updating my local diff viewer skepsis (github.com/oxidecompute...) to use their new high performance component. completely smooth on a +90,000 -60,000 diff
On Rendering Diffs
A technical deep dive into how we built the @pierre/diffs package and CodeView component for zero-blanking diff rendering.
pierre.computer
conputer dipshit@davidcrespo.bsky.social · 6mo agoseriously. what an amazing thing to just have to think about the data model and a few UX tweaks, and the fundamentals are taken care of. I’m almost surprised they open sourced the library. the Pierre team must be very confident. bodes well
This article explains why many Bloomberg engineers choose to stay with the company for a long time. leaddev.com/career-devel...
I just published a deep-dive into the 250-hour build behind syntaqlite, a SQLite formatter and LSP I built using AI agents. AI agents were the only reason built this after 8 years of wanting but there's a psychological toll to AI-assisted engineering. The post-mortem: lalitm.com/post/buildin...
Eight years of wanting, three months of building with AI
For eight years, I’ve wanted a high-quality set of devtools for working with SQLite. Given how important SQLite is to the industry1, I’ve long been puzzled that no one has invested in building a reall...
lalitm.com
Warning to open source maintainers: the Axios supply chain attack started with some very sophisticated social engineering targeted at one of their developers simonwillison.net/2026/Apr/3/s...
The Axios supply chain attack used individually targeted social engineering
The Axios team have published a full postmortem on the supply chain attack which resulted in a malware dependency going out in a release the other day, and it involved …
simonwillison.net
I spent 2 months learning about quantization and am extremely proud of the post I've written about it. I think these are some of the nicest visuals I've ever made, and I love how this compression technique invented in 1898 is being used on the bleeding edge in 2026. ngrok.com/blog/quantiz...
Quantization from the ground up | ngrok blog
A complete guide to what quantization is, how it works, and how it's used to compress large language models
ngrok.com
This must've been one of the most challenging things I've worked on in a while. Thanks Bloomberg for sponsoring my work on this, and everyone who helped shipping a fix in time!
Node.js@nodejs.org · 6mo agoCan a hash be both HashDoS resistant *and* quickly reversible? That's the puzzle we had to tackle in V8 for the March 2026 Node.js security release. For details, check out our blog post (with the math for the curious!). For a quick overview, 🧵 below nodejs.org/en/blog/vuln...
The recording of @jason-williams.co.uk talk ‘Temporal: It’s about time!’ is now available to watch online! 2026.stateofthebrowser.com/speaker/jaso... And Temporal has reached Stage 4: www.igalia.com/2026/03/13/T...
What if you could collect Wikipedia articles and make them battle? Wikigacha, created by Japanese developer Haruki Sugiyama, turns every Wikipedia article into a collectible trading card.
ECMAScript excitement 😉 This week in NY @tc39.es advanced these proposals 🎉 4⃣ Intl Era/Month Code 4⃣ Temporal 3⃣ Import Text 2⃣.7⃣ Error Stack Accessor 2⃣.7⃣ Iterator Includes 2⃣ Intl Unit Protocol 2⃣ Thenable Curtailment 1⃣ Error Code Property 🗑️ Dynamic Import Host Adjustment
Temporal is now Stage 4 at TC39 🎂🎂🎂 Thanks to all the other champions of JavaScript's new date-time API. It has been a wild ride over many years! I wrote a blog post explaining how we got here 📜 bloomberg.github.io/js-blog/post...
![Code example showing the usage of Temporal.ZoneddateTime
```js
// London DST starts: 2026-03-29 01:00 -> 02:00
const zdt = Temporal.ZonedDateTime.from(
"2026-03-29T00:30:00+00:00[Europe/London]",
);
console.log(zdt.toString());
// → "2026-03-29T00:30:00+00:00[Europe/London]"
const plus1h = zdt.add({ hours: 1 });
console.log(plus1h.toString());
// "2026-03-29T02:30:00+01:00[Europe/London]" (01:30 doesn't exist)
```](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:r5emt2gkdrkb2yc6y7xndxpe/bafkreicgonzisednk3qegophndqf6fnslwtvbd7gshsgtv6fpi3arh2dsi)
Source maps are a vital part of modern web development, but the lack of a standard made it impossible for us to add new features or improve the debugging experience. This is the story of how we standardized source maps and how we continue to ship features through standards 📜 🧵
![A JSON file representing a source map. The code contains:
{
"version": 3, // Always the integer 3
"file": "out.js", // Optional: name of the generated file
"sourceRoot": "", // Optional: prefix prepended to each entry in "sources"
"sources": ["foo.js", "bar.js"], // Required: list of original source URLs/paths (or null)
"sourcesContent": [null, null], // Optional: inlined source text, aligned with "sources"
"names": ["src", "maps"], // Optional: symbol names referenced by "mappings"
"mappings": "A,AAAB;;ABCDE", // Required: encoded mapping data (base64-VLQ deltas)
"ignoreList": [0] // Optional: indexes into "sources" considered "third-party"
}](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:ny4wl2lgdvgej5rzaxk45ccn/bafkreiftsj6be2ea7h64mk4nenpkybnly5vte6na3le6xb4jpxgarok62m)
Some time ago, @jonkuperman.com & @tchetwin.bsky.social had a dream for the JS engineers at Bloomberg to be more public about the cool JS work we have going on. That dream has come true - now we have a blog platform 🎉 (You'll see more articles over the next few days) bloomberg.github.io/js-blog/
Bloomberg JS Blog
The official Bloomberg JavaScript blog - insights, tutorials, and best practices from Bloomberg's JavaScript engineering team.
bloomberg.github.io
🆕 The URL Pattern API is Newly Available! Use it to match and extract parts of URLs, no need to reinvent routing logic. Supports literals, wildcards, named groups, and even regex constraints. Learn how it works 👇 developer.mozilla.org/en-US/docs/...
This is a welcome change. Puzzmo is my most-used Progressive Web App! www.puzzmo.com/user/fy/jpo34
@jpo34 on Puzzmo
Re-imagined mainstays like the daily Crossword Puzzle, modern classics like Really Bad Chess and SpellTower, and even a few brand new puzzles.
puzzmo.com
Orta Therox@orta.io · 8mo ago- "Follows not Friends" - we've changed the core relationship dynamic on @puzzmo.com to make relations easier to setup - Puzzmo staff are friends by default ala Myspace Tom - Fancy opengraph images for your public profile URL - Friends / Groups / Community leaderboards are all on by default
