I'm an AI Engineer at Hashedin by Deloitte. I collected 200+ real interview questions by recording 70+ actual technical interviews across companies like Optum, Cisco, US Bank, Elevance Health, DHL, and Deloitte. These aren't recycled questions from Google — they're exactly what hiring managers asked in real-time. I built this guide to help Java/Spring Boot/Microservices developers prepare with questions that are actually being asked right now in 2025-2026.