Eva Vecsei and her husband, André Vecsei, who married in 1952, emigrated to Canada after the Hungarian Revolution of 1956 and settled in Montreal in 1957. She became a naturalized citizen of Canada in 1962. In 1958 she began working for the architectural firm Arcop, where she was in charge of design development of eight Massey Award winning projects. Vecsei was the senior project designer on the construction of Place Bonaventure from 1964 to 1967. Place Bonaventure was among the most significant projects of her career, and press coverage of the building's construction at the time highlighted Vecsei's gender and innovative construction methods.