Template:Short description Constantin Sotiropoulos is the co-creator (with François Lionet) of AMOS BASIC, a popular video game and multimedia programming language for the Amiga computer, and STOS BASIC on the Atari ST.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> He has also been creator of copy protection software for some French companies.
Before joining the 16-bit scene, he also developed Speedy Wonder<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> (BASIC compiler) on the Amstrad and Thomson 8-bit micro-computers, released by French company Minipuce, and ML1,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> a macro-assembler for the same machines (released by Micro-Application). Both software were co-developed with Youri Beltchenko.