As others have said, maybe doing tricky CS-heavy coding puzzles and applying to the companies that screen for them is not the way to go. Lots of companies just need someone who knows their way around particular language and web framework. How about building out an idea for a website in Rails or Django and putting it on Heroku? Go to meetups, show it to people, network, and get advice. Not a sure thing but definitely an alternative strategy to consider. Best of luck!