Majka won his first professional victory on Stage 14 of the 2014 Tour de France.[2] He won again on Stage 17.[3] He did well in the other mountain stages too, and won the polka dot jersey for the best climber. He is the first Pole to win a jersey in the Tour de France.
In 2013, he competed in the Giro D'Italia for the first time. He finished 7th, eight minutes behind the winner Vincenzo Nibali. In 2014, he finished 6th.