00:00 Intro
00:48 Why write a compiler in JavaScript
07:29 Why rewrite the compiler in Go
14:49 LLMs for large migrations
20:12 Why Javascript is so popular
26:32 Why ever use Javascript on the backend
32:59 What it takes to build a programming language
37:06 Will there be fewer languages in 10 years
42:57 Hands on engineering vs delegation
49:14 Why fast tooling matters more now
51:16 AI software engineering predictions
58:52 The most technically challenging work
01:02:04 Top book recommendation
01:03:50 Advice for his younger self
01:05:00 Outro

Just summarizing the title teasers:

10x faster by switching from JavaScript to Golang. Rust was not feasible because it does not have a GC/does not support circular dependencies, and they have many of those, and did not want a rewrite but a minimal effort switch.

AI may produce a lot more code, but what code does “90% of code” refer to. AI is not capable of novel or complex stuff, you still need humans in the loop. Juniors remain significant to train them into seniors.