Credentials and prior experience are used in all companies to establish your title, level, salary and position - things that actually matter when you start work

Credentials and prior experience are used in all companies to establish your title, level, salary and position - things that actually matter when you start working. Coding interview is just a baseline that everyone hired is expected to exceed. In most companies it does not really matter how well you did in coding interview - the only thing that matter is that you passed it. After that coding interview results are not really considered when choosing level (other than for junior engineers). Nobody expects senior engineer to be much faster when coding simple loop but he sure should be able to code it. On the other hand design and behavior interview results are often have much more influence on final salary and level.