In the bustling digital headquarters of TokyVideo , a mid-sized video streaming platform, three engineers—Maya, Leo, and Sam—faced a quiet crisis. Their user engagement had flatlined. People signed up, watched one video, and vanished. The data team’s report was blunt: “Users feel lost. Search is slow. Recommendations are random.”

No one had a clear answer. They had been building features for their resumes, not for real people.

Engagement among test users tripled. Abuela Rosa had watched 22 videos in four days—more than she had in the previous six months.

They rolled out the changes to 1,000 dormant users, including Abuela Rosa.