[ccdev]

I am not sure how Leetcode would help out here in specific, for someone who already has years of proven programming experience with other companies. Any company who holds any water in what they do would substitute rote knowledge of algorithms with real world programming skills.

[ddtaylor]

Leetcode is used by many companies for interviews and whiteboards. For example when I interviewed at Facebook the first screening problems were from the site and the later whiteboard problems for the on-site interview were as well.

[ccajas]

I have no experience working with software "at scale" so it may be that my interviewing experiences are different from yours. Generally speaking, though, software developers at non-tech companies, or at agencies for small-med business clients (what I tend to work for) don't ask those kinds of technical questions.