I'm a former startup founder and staff engineer at a big tech company. It depends a lot on where you want to be. Here's my take. You want to be an engineer at

I'm a former startup founder and staff engineer at a big tech company. It depends a lot on where you want to be. Here's my take. You want to be an engineer at a small startup: * Typescript and be familiar with common libraries and frameworks. I believe TS is going to become more common everywhere, frontend, backend, DevOps, etc. * Learn python if you don't already know it * Learn some kind of data science stack you can use to analyze small data sets (under 100GB). Pandas+numpy+scipy, Julia, whatever. Just be good at answering data questions and building small models. Big company: * Writing and communication. Practice writing about projects you've worked on and write down the projects you want to build with enough details that a junior engineer could build it. * Be aware of how much companies are paying and be willing to leave for better compensation, work-life balance, or responsibilities. Practice interviewing. * Read all the major postmortems from incidents at a big tech company and try to find patterns related to your area or part of the stack.