Unified Control for Multiple Computers

I aim to create a seamless workflow across multiple (5-7) computers, conducively fostering collaboration efforts. I seek a software solution or device capable of linking my computers for a unified control experience - where a single mouse click or keyboard entry translates across all computers instantly. This software or device must be compatible with Windows operating systems. Having expertise in hardware engineering, software development, and a good understanding of networking will be beneficial for this project. Ideally, a freelancer with prior experience in developing similar systems would be perfect.