Bright wrote Mattel Intellivision games while at Caltech, then worked as a mechanical engineer after graduation. After learning C in the early 1980s he ported Empire to the IBM PC, stating that C "might as well have been called EIL, for 'Empire Implementation Language.'"[9] Bright developed the Datalight C compiler, also sold as Zorland C and later Zortech C.[10]
Bright was the main developer of the Zortech C++ compiler (later Symantec C++, now Digital Mars C++), which was the first C++ compiler to translate source code directly to object code without using C as an intermediate.[11]
Bright is the creator of the D programming language. He has implemented compilers for several other languages, and is considered an expert in many areas related to compiler technology.[12] Walter regularly writes scientific and magazine articles about compilers and programming[13] and was a blogger for Dr. Dobb's Journal.[14]
Around 2014, Bright wrote Warp, a fast C/C++ preprocessor written in D, for Facebook.[15][16][2]