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Boris Cherny's Blog

19 Sep 2026

https://borischerny.com/management,/product/2026/09/19/I-am-often-wrong.html

[I shared this note with my team earlier this week, and am posting it here as well. I hope it is interesting or helpful for others working on building product in the age of AI.]

Boris Cherny's Blog

https://borischerny.com/

Boris Cherny’s blog. Software engineer at Anthropic, creator of Claude Code, and author of O’Reilly’s Programming TypeScript. Writing about software, TypeScript, and whatever else is on my mind.

Boris Cherny's Blog

19 Jun 2024

https://borischerny.com/javascript,/typescript/2024/06/19/ES-Modules-Are-A-Mess.html

Coming back to JavaScript and TypeScript after a few years neck deep in Python and Hack, I kept hitting a number of new, cryptic errors when running NodeJS code in my dev environment:

Boris Cherny's Blog

10 Dec 2023

https://borischerny.com/tech/2023/12/10/Working-Remotely.html

For the last year and a half, I have been working at Instagram in Japan. It’s a bit of an unusual setup: I live and work remotely from Nara, Japan, in a timezone that few other Meta engineers work in (most of Instagram and Meta are spread across the US and Europe).

Boris Cherny's Blog

07 Sep 2022

https://borischerny.com/2022/09/07/time-and-timing.html

You often hear that “timing matters”. It helps to think about this as two related concepts: time and timing.

Boris Cherny's Blog

17 Jan 2022

https://borischerny.com/food/2022/01/17/Dinosaur-food.html

I just finished Oliver Sacks’ excellent Everything in Its Place. In it, he mentioned as an aside that the Ginkgo biloba tree is hundreds of millions of years old, and its phenotype has been practically frozen since then – a living fossil.

Boris Cherny's Blog

13 Mar 2021

https://borischerny.com/javascript/2021/03/13/Data-Fetching.html

It’s 2021, and data management on the web still sucks. This is crazy!

Boris Cherny's Blog

24 Dec 2019

https://borischerny.com/typescript/react/2019/12/24/Use-unions-of-objects.html

When typing React component props using TypeScript, I often see code that makes use of optional and nullable fields:

Boris Cherny's Blog

08 Sep 2019

https://borischerny.com/philosophy/of/programming/2019/09/08/On-Contagion.html

If you have a tree with a node that has a property P, and all of its parents also need to have property P, then P is contagious.

Boris Cherny's Blog

26 May 2019

https://borischerny.com/writing/2019/05/26/Tips-For-Writing-A-Technical-Book.html

I spent the last year and a half writing my first technical book for O’Reilly (Programming TypeScript). I’d never written a technical book before. In fact, prior to the 300-page book, the longest thing I’d written was a 20-something-page paper in college.