Right, a professional programmer uses advanced tools and design pattern such that 100K can look like 1001K or 1000 100 LOC. The complexity of a software syste

Right, a professional programmer uses advanced tools and design pattern such that 100K can look like 1001K or 1000 100 LOC. The complexity of a software system is due to interaction between its components. A professional developer know how to make it N instead of N2. Note that most of the big software system that you know, were written by a single/two developers - C++/ Java / Unix / Linux / Riser FS / Kubernetes. This can be evident by the power law distribution of github commits for every popular github project.