Our client, a growing enterprise seeking to enhance its IT operations, is looking for an experienced Senior Infrastructure and Security Engineer to take ownership of 3rd-line infrastructure and cybersecurity support. This hands-on role requires deep technical competency, project experience, and a proactive attitude, ensuring stability, security, and efficiency in the company s IT environment.As part of IT Operations, you will collaborate with stakeholders and lead efforts to design, build, and implement solution architecture. The company is shifting toward a more mature enterprise IT framework, leveraging Microsoft 365 and Azure (with AWS experience as a nice-to-have). Key ResponsibilitiesProvide 3rd-line infrastructure and security support, ensuring system reliability and cybersecurity best practices.Design and implement cloud-based and on-premise IT solutions, supporting Azure and Microsoft 365 environments.Collaborate with 1st and 2nd line engineers, offering mentorship and technical leadership.Drive solution design, IT operations, and network security in an enterprise-level setting.Oversee Active Directory (AD) conversion, ensuring seamless integration into the IT environment.Work within a customer-facing role, ensuring IT systems align with business needs.Participate in infrastructure transformation initiatives, aligning with enterprise-level standards.Ensure compliance with cybersecurity and regulatory frameworks while implementing risk mitigation strategies. Key ..... full job details .....