Running a company contains plenty of ups and downs, but you have to stay confident as challenges arise, says Roman Stanek, founder and CEO of GoodData. "In many cases, the only tool you have is confidence," he said. "You cannot always tell people, 'This is why.' You to have tell people that you have confidence and convince them to believe in you." As the founder of your company, you also have to take responsibility for its performance, he says.