Martínez was born in Logroño, La Rioja, and played as a senior for SD Loyola and CD Agoncillo.
[2] In March 2014, Martínez was sacked from Zaragoza's Juvenil squad,[3] and had his first senior experience later in the year, after being named manager of Tercera División side CD Arnedo.
[5] The following 12 March, he was named in charge of CD Izarra in Segunda División B,[6] and managed to avoid relegation with the side before leaving on 5 June 2019.
[8] He led the club to the play-offs in 2021, but lost to Burgos CF in the first round; on 18 May of that year, he opted to leave after refusing a new deal.
[9] On 22 June 2021, Martínez was named CD Numancia manager,[10] and led the club to promotion to Primera Federación in his first year.