[1] Lajthia started his youth career at KF Teuta Durrës in 2011.

[2] On 3 January 2020, Lajthia returned to KF Erzeni on a contract for the rest of the season.

[3] He participated with Albania national under-16 football team in the UEFA Development Tournament 2015 and played 1 match under coach Alban Bushi on 3 May 2015.

[4][5] He also was called up at Albania national under-19 football team by coach Arjan Bellaj to participate in the 2017 UEFA European Under-19 Championship qualification from 6–11 October 2016.

[7] He received his first call up for the Albania under-20 side by coach Alban Bushi for the double friendly match against Azerbaijan U-21 on 21 & 26 January 2018.