Born in
Cerrillos,
Santiago, Armijo started his career as a fitness coach and joined
Marcelo Bielsa's staff in the
Chile national team, in 2007 as an assistant to fitness coach Luis María Bonini. He left the staff in 2010 after the
2010 FIFA World Cup, and subsequently worked as a fitness coach at
Universidad Católica,
O'Higgins,
Santiago Wanderers,
Cobreloa and
Unión Española. Armijo returned to O'Higgins in 2016 after acquiring his coaching license, and was named manager of the club's youth categories. On 1 August 2017, he was named interim manager after the resignation of
Cristián Arán, He stayed in the role for two matches, and subsequently became an assistant of newly appointed
Gabriel Milito. After leaving O'Higgins in 2019, Armijo subsequently worked as a head of youth development at
Barnechea before being named manager of
Primera B side
Deportes Melipilla on 16 December 2020. He led the club to the
promotion play-offs, where his side achieved promotion after defeating
Unión San Felipe on penalties. In 2023, Armijo assumed as manager of
Deportes Antofagasta. He was sacked in June 2024 for ambiguous reasons. After a brief stint as
sport manager of Bolivian club
GV San José, he was appointed manager of
Deportes Santa Cruz. He was released in April 2026. ==Other works==