From June 30 to July 2, École 42 Paris hosted a hackathon run with Apple and CMD+F. Ten teams, one challenge: design and ship an app in 48 hours, against a precise brief. Lean on modernity and creativity to build a product that genuinely delights its users. I was there as the iOS expert, working with the teams throughout the event. Answering questions, clearing up doubts, and steering each group through its technical and product calls so it could hit the deadline without giving up on what it set out to ship. A real chance to meet people with all their questions and their doubts. In 48 hours, intentions turn into concrete trade-offs very fast, and that is exactly where guidance matters most.