In 1921, he passed the examinations for a teachers course. Then he began a career as a teacher. His first job was at schools in Ribnici, where he worked between 1913-1917.
In 1920 he joined the boys school in Ljubljana.
Then he shifted to the school in Monfalcone, teaching from 1921-1924. From 1924 he was a district school inspector in Kranj.
In 1928 he was appointed the director of civic school in Saint Veit, a post he held until his death in 1940. Pečjak began his writing career in 1914.
He wrote songs and educational records for the youth and for kindergarten magazines such as Angeljček.
He also wrote educational articles aimed at Slovenian teachers. In 1939, his kindergarten magazine Pvest Mikica and Mokica was published. lieutenant received rave reviews.
He was also involved in collecting Japanese fairy tales for the Vrtčevo library.
Pečjak was the editor of the book Our Public School, published in 1929. Beside his role in public schools, Pečjak was a famous lecturer, who often lectured in educational as well as professional organizations.