Actually, there is a legal requirement like that. Businesses that hire h1b visa recipients must file an LCA with the USDOL, that essentially states it has looke

Actually, there is a legal requirement like that. Businesses that hire h1b visa recipients must file an LCA with the USDOL, that essentially states it has looked and cannot find an equally qualified US Citizen for the position that is seeking the visa. The original 'ruse' the H1B visa was to address was the supposed shortage of qualified engineers in technical professions. The only shortage that ever existed was of low-paid professionals. One simply has to look on one of the online job boards to see how the system is gamed. Many positions require quite a mix of programming languages, frameworks and knowledge up and down the stack.