Video from PLRUG 16.11.2023 with a presentation by Michał Łęcicki. The speaker describes business archetypes patterns: a great pill of knowledge on implementing universal concepts occurring in business and business software systems. The presentation includes various Rails examples and practical recipes.

Video from PLRUG 19.10.2023 with a presentation by Alexander Repnikov. The speaker introduces the Doctrine of Useful Objects, in his speech he talks about the principles that must be followed to achieve a Useful Object, as well as the concept of Substitution, which opens another way to test the dependencies of an object.