He is a two-time Spanish Athletics Championships winner, and was the bronze medalist at the 2023 European Throwing Cup.

By virtue of his national titles, Quijera was invited to compete in the javelin throw at the 2015 World U18 Championships.

He posted the second-best mark in the qualification behind only Hercules van Vuuren, who failed to medal in the finals.

Given this, Quijera was in good position to medal after the first few throws, but he was eventually overtaken and had to settle for 4th place.

[7] In 2023, he was part of the Spanish team that finished fourth in the European Games and achieved seventh place in the javelin event.