Engin "MAJ3R" Küpeli is one of the most experienced players on the Counter-Strike pro scene. His career began in 2006 in CS 1.6. In 2013, he transitioned to CS:GO and joined Imaginary Gaming, with whom he won a silver medal at the ESL Major Series: Winter 2012.
Between 2014 and 2015, MAJ3R participated in very few tournaments but managed to help Epsilon Esports reach the semifinals of the StarLadder StarSeries XI. At the end of 2015, Küpeli was invited to Milenium, and almost immediately, he and his team became the champions of Gamers Assembly 2016. After that, he played for Space Soldiers and Team Turkey, where he won gold medals at WESG 2016 Middle East & Africa Finals and The World Championships 2016, respectively.
In November 2016, Engin returned to Space Soldiers, where he secured victories at Europe Minor Championship - Boston 2018 and DreamHack Open Austin 2018, as well as a silver medal at the World Electronic Sports Games 2017.
In the spring of 2019, MAJ3R signed with LDLC, becoming the champion of the ESL Championnat National Summer 2019. Between 2020 and 2022, he played for Turkey 5 and Sangal Esports, but failed to achieve significant success with these teams, aside from a few victories in regional tournaments in Turkey.
Despite this, Engin consistently showcased a high level of gameplay, which earned him a spot on Eternal Fire in August 2022, where he remains to this day. Over the past 2.5 years, he has led the team to win several major tournaments. Notable victories include IEM Road to Rio 2022: European RMR - Open Qualifier #3, ESL Challenger at DreamHack Rotterdam 2022: European Qualifier, and Intel Extreme Masters Rio 2024: European Qualifier.
Additionally, as part of Eternal Fire, Küpeli achieved 1st-2nd place at tournaments like ESL Pro League Season 17: European Conference, BLAST.tv Paris Major 2023: European RMR Open Qualifier #2, and ESL Pro League Season 18: European Conference. He also earned silver medals at ESL Challenger at DreamHack Winter 2023, PGL Major Copenhagen 2024: European Qualifier B, Esports World Cup 2024: European Qualifier, BetBoom Dacha Belgrade 2024 #2, ESL Pro League Season 20, and BLAST Bounty Spring 2025.