Alexander began climbing at the age of six. At just ten years old he was climbing 300m multi-pitches with his father. In 2006 Alexander began training with the local bavarian team “Landesstützpunkt Franken” and later with “Bundesstützpunkt Sportklettern” in Erlangen-Nürnberg, where he met his coaches Ludwig “Dicki” Korb and Patrick Matros, who still coach him today.
Alexander’s ascent of Estado Critico in Siurana, Spain in 2013, when he was 19, is the world’s first published 9a onsight.
On the 9th of May 2018, Alexander clipped the chains on his first 9b+ (5.15c) “Perfecto Mundo”, (first ascent, route bolted by Chris Sharma). Other notable ascents include “Fightclub” 9b – First Ascent and “First Round First Minute”.
On the 5th of August 2020, Alex sent “Bibliographie” 9b+ (5.15c / FA).
In 2017, Megos won silver in both the Bouldering European Championships, in Munich and the IFSC Lead World Cup in Kranj, Slovenia. In 2018 he won bronze at the IFSC Lead World Cup in Chamonix and one week later won Gold in the Briancon World Cup. Later in the year he won bronze in the Lead World Championships. He followed this up with a silver in the 2019 Lead World Championships, and qualified for the combined finals and thereby qualifying for the 2020 Olympic Games in Tokyo (postponed to 2021).