IT Infrastructure Engineer in City of London

Our client, a growing enterprise seeking to enhance its IT operations, is looking for an experienced Senior Infrastructure & 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 Responsibilities

• Provide 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 Requirements

• Proven experience in senior infrastructure and security engineering roles.
• Strong technical competency in cloud and cybersecurity, ideally within an enterprise or SME environment.
• Hands‑on expertise with Microsoft 365, Azure, and networking (AWS is a plus).
• Experience in solution architecture, IT operations, and infrastructure design.
• Practical experience in cybersecurity, system design, and infrastructure architecture.
• Capable of rolling up sleeves and leading projects from conception to implementation.
• A background working with large-scale IT environments.

If you\’re an experienced Infrastructure & Security Engineer with a passion for hands‑on technical work and solution architecture, we d love to hear from you!