http://tweedge32j4ib2hrj57l676twj2rwedkkkbr57xcz5z73vpkolws6vid.onion/2021/breaking-into-product-security
For Cloud, this is a bit of a wildcard - I’d get familiar with Go and TypeScript instinctively. Reading this, you might be concerned that it’ll take a year or more to learn each of the many languages mentioned - this is thankfully not true for most people. Your first language is hard to pick up and could take a year or more of work.