I went through a 3-round interview process for the Senior Security Engineer - Incident Response position at T-Mobile. The process was structured, professional, and challenging, focusing on technical expertise, leadership in incident response, and communication skills. 1. Round 1: Technical Panel Interview In-depth technical questions on incident response scenarios, forensics analysis, and malware investigation. Scenario-based exercises, including MITRE ATT&CK mapping and PowerShell activity analysis. 2. Round 2: Behavioral and Leadership Interview Focused on communication skills, leadership during incidents, and cross-functional collaboration. Questions about managing bridge calls and explaining complex issues to non-technical stakeholders. 3. Round 3: Managerial Panel Interview Assessed strategic decision-making and incident response leadership. Focused on balancing technical challenges with business priorities.