The case of rapid prototyping of a small prototype for a server backend of a geolocation-based mobile game, using nginx, OpenResty, Redis and Docker will be examined in the talk. Topics will include: why was the technology stack selected, what are the advantages (and some disadvantages), the architecture of the prototype, and how the features of the stack were used in the implementation. Some words will be said on how to keep iterations on the prototype rapid and how to upgrade the project from the prototype to a production system.