Maybe the next time try to convince them that you're a valuable guy, they gave you hard problems to solve and you did a great job, but its possible that they we

Maybe the next time try to convince them that you're a valuable guy, they gave you hard problems to solve and you did a great job, but its possible that they were expecting something different. People don't get hired only for technical skills, they get hired for a lot of reasons. Don't take it too serious, try in another company were your skills are valuable!