After receiving his degree in aeronautical engineering from Massachusetts Institute of Technology (MIT) in 1936, Shainin became a design engineer at the Hamilton Standard Division of United Aircraft Corporation (now United Technologies Corporation).
Nach seinem Abschluss in Luftfahrttechnik am Massachusetts Institute of Technology (MIT) begann Shainin 1936 seine berufliche Laufbahn als Konstrukteur bei der Hamilton Standard Division der United Aircraft Corporation (heute United Technologies Corporation).