Contributed to the marcin-filipiak/test_wspolpracy repository by establishing foundational project documentation and delivering early-stage feature planning. Focused on improving onboarding and governance, work included authoring comprehensive README and logging documentation in Markdown, as well as providing UI assets to support validation and review processes. In the following month, designed and documented a Sailboat Simulation feature, producing a detailed functional specification and an initial prototype release. Leveraged skills in technical writing, software design, and C# to create clear planning artifacts and implementation notes, setting the stage for iterative development and facilitating downstream testing and stakeholder engagement without addressing bug fixes.