Careers pages are a bit broken, for instance, "Software Engineer, Runtime Team" role says "Experience developing production software in Go or Ruby" (https://www.heroku.com/careers/software-engineer-runtime-tea...).

When you click on the "Apply for..." button, another page appears saying it's for "Distributed Systems Software Engineer - Public Cloud (Senior/Lead/Principal)" role and mentions "Deep knowledge of programming in Java, Golang, or Python". So not only the title of the role changed, but all the requirements as well.