Mapply's main challenge lay in its complex architecture. Unlike a simple showcase site, this web application had to manage OpenAI API integration, data security, and project scalability. I had to design a high-performance database, ensure a seamless experience on mobile and desktop, and guarantee optimized server resource management. Another challenge: optimizing the landing page's conversion rate. Good design isn't enough; you need a sophisticated UX approach to transform a visitor into a user.