Scaling an Appointment Booking System

My Garner Health interview was a system design round. The first question was to design an appointment booking system where patients could search for doctors and book appointments. I discussed the core Patient, Doctor, and Appointment data models; how to query a doctor's available time slots; and how to book or cancel an appointment. The design also needed to prevent multiple patients from booking…

Shared by a candidate · reported Apr 2026. Interview formats change; use it as a guide, not a script.