Senior IT Infrastructure & Systems Manager

Nexus Jobs; Greater London; Hybrid; GBP 58,000 - 98,000; Full time

Job summary

Nexus Jobs in London seeks an experienced Senior IT Infrastructure Manager to lead enterprise IT infrastructure, systems administration, and security-focused operations in a hybrid setup with 3 days per week in the Central London office. The role requires oversight of Windows and Linux servers, VMware, Veeam backup, and Microsoft 365, with governance across security, networks, and VIP stakeholders.

The position delivers a broad remit across backup, disaster recovery, endpoint security, and IT

Qualifications

• Experience in enterprise IT infrastructure and systems administration.

Responsibilities

• Oversee, manage, and improve IT infrastructure, enterprise systems, network, and end-user computing services.
• Ensure availability, security, performance, and resilience of critical business systems.
• Lead technical teams and support key stakeholders across the organization.
• Administer, maintain, and optimize Windows and Linux server environments.
• Manage VMware virtualized infrastructure and enterprise backup solutions (Veeam).
• Administer endpoint security and encryption solutions; support SIEM and security monitoring tools.
• Perform SSL/TLS certificate lifecycle management and patch management.
• Support Microsoft 365 services and related cloud technologies.
• Monitor performance, capacity, availability, and infrastructure health; ensure regulatory compliance.

Skills

Enterprise IT infrastructure

Windows & Linux servers

Network administration

Cybersecurity practices

Vulnerability management

SIEM

VIP stakeholder management

Hybrid work environment

Tools

VMware

Veeam Backup & Replication

Veeam ONE

Veeam Recovery Orchestrator

Microsoft 365

Active Directory

FortiGate

Cisco switches

Job description

Salary: £58,000 - 98,000 per year

Requirements

• We are looking for an experienced Senior IT Infrastructure Manager with at least 7 to 10 years of experience.
• We need strong experience in enterprise IT infrastructure and systems administration.
• We require experience working with financial services, banking, trading, or treasury environments.
• We need proven experience managing mission-critical infrastructure and applications.
• We require experience operating in regulated and security-focused environments.
• We need strong technical expertise across Windows and Linux server environments, VMware virtualized infrastructure, Veeam backup and disaster recovery, Microsoft 365, endpoint security, and network administration.
• We require experience supporting enterprise applications and financial systems, including trading and treasury platforms.
• We need familiarity with cybersecurity tools and practices, including vulnerability management, SIEM, and SSL/TLS certificate lifecycle management.
• We require experience supporting VIP stakeholders.
• We need someone able to work in a hybrid arrangement with 3 days in our Central London office.

Responsibilities

• We oversee, manage, and continuously improve our IT infrastructure, enterprise systems, network environment, and end-user computing services.
• We ensure the availability, security, performance, and resilience of critical business systems.
• We lead technical teams and support key stakeholders across the organization.
• We administer, maintain, and optimize Windows and Linux server environments.
• We manage VMware virtualized infrastructure.
• We oversee enterprise backup and disaster recovery solutions using Veeam Backup & Replication, Veeam ONE, and Veeam Recovery Orchestrator.
• We administer endpoint security and encryption solutions.
• We support endpoint DLP, SIEM, and security monitoring tools.
• We manage patching processes using ManageEngine Patch Manager Plus.
• We support Microsoft 365 services and related cloud technologies.
• We monitor system performance, capacity, availability, and infrastructure health.
• We ensure compliance with IT governance, security policies, and operational standards.
• We provide advanced desktop, laptop, printer, mobile device, and branch office IT support.
• We deliver AV support for meeting rooms, conferencing, presentations, and collaboration systems.
• We manage OS deployment, imaging, image creation, maintenance, and software packaging.
• We administer Active Directory, Group Policy Objects, user provisioning, and NTFS permissions.
• We support Microsoft 365 applications including Outlook, Teams, OneDrive, and SharePoint.
• We resolve technical incidents and service requests in line with agreed SLAs.
• We support and administer business-critical applications and file synchronization and replication solutions.
• We configure and support Cisco switches and routers.
• We administer FortiGate firewall environments.
• We monitor network performance, availability, and security posture.
• We support vulnerability management, security monitoring, and log analysis tools.
• We perform SSL/TLS certificate lifecycle management, including CSRs, certificate chains, and private keys.
• We ensure adherence to cybersecurity policies, standards, and regulatory requirements.
• We support physical access control systems.
• We develop, maintain, and enforce IT policies, standards, and operational procedures.
• We produce system architecture diagrams, technical documentation, SOPs, and performance reports.
• We identify and drive opportunities for automation and service improvement.
• We support technology planning, infrastructure modernization, and transformation initiatives.

Technologies

• Active Directory
• Cloud
• Cisco
• Firewall
• FortiGate
• Support
• Linux
• Microsoft 365
• Mobile
• Network
• Security
• SharePoint
• VMware
• Veeam
• Windows
• Office 365
• DevOps
• Hardware
• LAN
• Nexus
• Splunk
• Swift
• TCP/IP
• iOS

More

We are a London-based organization offering a senior IT infrastructure and systems role with some remote working possible. This is a permanent, full-time position with a salary range of 55,000 to 60,000. The role sits within a complex enterprise environment covering financial, trading, and treasury systems, and it is a hybrid position with 3 days in our Central London office.

last updated 36 week of 2026