“One to rule all, one to find all, one to gather all and bind all in darkness.” It’s been a nice couple of years since the micro-lobby architecture was so popular. The false start we have made in IT by adopting a distributed system architecture without legitimate architectural drivers hurts many development and maintenance teams to this day. History seems to enjoy repeating itself, which is why the infamous “Monoliths” are returning to the favor. Is monolithic architecture really bad? The presentation will discuss the Modular Monolith – the monolith’s younger brother, who cares about the good name of monolithic architecture. The main features of such a system will be discussed, such as modularity and architectural drivers, which speak for this architecture together with those that lead to the division of the Monolith and the migration to microservices architecture. During the session, one of the ways of designing the Modular Monolith will be presented, in accordance with the best practices and design patterns known in the IT systems engineering environment.