Mamadu Sirajo Jalo is from Quebo, Guinea–Bissau. He was born in Quebo in 1978 to the family of Alhaji Cherno Aliu Jalo and is now married with two children.
Sirajo attended ESE College Guinea-Bissau, receiving a Diploma in English and Portuguese Languages in 2007.
From 2008 Sirajo gained employment with Drum Resources Limited (now Vallis Group Limited) as Assistant Supervisor in Guinea Bissau. He was later posted to Senegal in 2009 to start up operations there as the Senior Supervisor. In November 2012, Sirajo was moved to a position in Cote d’Ivoire as the Operations Manager. Since May 2014, Sirajo has been posted in Guinea as the head of the Vallis team there