Provides third-level AWS cloud support for customers, troubleshooting complex technical issues and designing scalable solutions. Responsibilities include systems administration, security reviews, patching, deployments, account administration, cost optimization, automation, monitoring, and Well-Architected Framework Reviews. The engineer supports presales engagements, quality-checks team work, participates in 24/7 on-call rotation, mentors junior engineers, and documents solutions. The role requires strong AWS, Linux, Windows, web-service, scripting, networking, and production operations expertise.