Folio3 is a development partner that focuses on building custom enterprise, mobile, and social media applications. It was founded in 2005 and has over 200 employees across offices in the US, Canada, Bulgaria, and Pakistan. Go-Lang is a statically-typed, compiled programming language designed for building scalable network applications and facilitating concurrency. Key features include structs instead of classes, built-in concurrency through goroutines and channels, and static compilation to binary files.