He was born in 1934, in the municipality of Quebradillas, Puerto Rico, and his studio is currently based in the Old San Juan.
There, under the tutelage of Fran Cervoni, Cajiga furthered his interest for Old San Juan, a subject that to this day permeates his art.
Many of his paintings, especially posters, were printed by the artist from Adjuntas, Puerto Rico Don Samuel Maldonado Plaza in the 1980s.
The printing was done in the silkscreen shop of Don Gildo Rivera Santiago in Ponce, Puerto Rico.
Doris M. Vázquez, from the Yale-New Haven Teachers Institute considered him one of the most “outstanding artists of the fifties”.