Coming through the youth system, Lajud began his senior career with Monterrey, scoring on his Liga MX debut in 2018.
[4] He registered to Monterrey's senior team in the Clausura 2018 Copa MX,[4] making his competitive debut on 20 February 2018, in a 2–1 win against Dorados.
[9] He made his debut two days later as a starter in a 3–0 home win against Atlético La Paz; after the end of the match, Lajud proposed to his girlfriend.
[18] In the 2023–24 season, Lajud scored eight goals in 36 games,[18] helping Atlante finish runners-up in the Apertura 2023[19] and champions of the Clausura 2024.
[8] Lajud was first called up by coach Aleksandar Ilić ahead of Lebanon's friendly fixture against Kuwait in Dubai, United Arab Emirates on 19 November 2022.
[28] On 30 June 2022, he proposed to his girlfriend at Estadio Ciudad de los Deportes, Atlante's home stadium, following his club debut.