Carlos Martinez started out as an opposition scout at FC Barcelona, working there from 2014 to 2017. He subsequently worked for Girona FC in 2017-2018, with the additional responsibility of performance analysis, Sevilla FC in 2018-2019 in the role of technical assistant and analyst, and he had been at Espanyol since July 2019, before joining AS Monaco in December 2019 to be a part of the technical staff of Robert Moreno.