[1] Born in Kochan, Hadzhiev began his football career playing for club Rodopa.

Hadzhiev, subsequently, made his professional debut in the match, at the age of 15 years and 8 months, coming on as a substitute in the 88th minute.

[7] On 6 July 2022, Pakhtakor Tashkent announced that Hadzhiev had left the club after his contract was terminated by mutual agreement.

[9] On 29 June 2023, Hadzhiev moved to Germany to play for Regionalliga side SSV Jeddeloh.

[10] He was first called up to the Bulgaria national football team in March 2018 for friendlies against Bosnia and Herzegovina and Kazakhstan, but remained on the bench.