People often don't realise the person who improved the codebase within a short span of time had years of experience in the domain. I know a class of engineers w

People often don't realise the person who improved the codebase within a short span of time had years of experience in the domain. I know a class of engineers who are solving the EXACT same problem using the EXACT same method from from company to company. To someone from outside, it might appear like they are job hopping looking at their average time spent at a company.