Guy Daher, a French iOS engineer at Algolia, shared his insights on building scalable Swift libraries at the Paris Swift Meetup in March. He discussed the challenges of scaling multiple libraries and presented strategies for tackling architecture, ObjC support, and choosing the right CI/CD system to achieve scalability. Daher's talk focused on the experiences gained while working on a library that simplifies search experience implementation in iOS applications, drawing from his background at Microsoft and attempts to co-found a startup. The presentation aimed to provide practical advice for developers building open-source Swift libraries.