Ideally we would like to hire a team with the different required skills (C++, JS...) but we are also open to hire multiple freelancers.
... A few development keys to remember: traceability (history of every change), user rights on everything, support all resolutions (phones, tablets, screens, large screens and projectors), multilingual and licensing(management and feature access)
Windows and Linux (ubuntu X64)
Git with Visual Studio Online
SKILLS for BackEnd (C++) programmer:
Optimization (call stack, recursive functions vs loops...)