IT Infrastructure & Systems Manager

Onyx-Conseil; Greater London; Hybrid; GBP 60,000 - 65,000; Full time

Job summary

Onyx-Conseil invites applications for an experienced IT Infrastructure & Systems Manager in London. You will oversee servers, networks, storage, and cloud services, ensuring high availability, security, and resilience across enterprise systems.

The role requires leadership of technical teams, strong stakeholder engagement, and a mix of on-site and home working. Expect exposure to financial services tech stacks and regulatory environments.

Qualifications

• Experience in IT operations and infrastructure design.
• Experience with Windows and Linux administration, virtualization, and cloud.
• Strong security and monitoring capabilities.
• Excellent stakeholder management and communication.
• ITIL or equivalent certifications are advantageous.

Responsibilities

• Administer and optimize Windows/Linux server environments.
• Manage VMware vSphere environments and backups.
• Oversee security, patching, monitoring, and DR/BC planning.
• Lead IT projects and coordinate with stakeholders.
• Document procedures, standards, and architecture diagrams.

Skills

IT Operations

Windows

Linux

VMware

Network Security

Project Management

Communication

Mentoring

Certifications

Bachelor's degree

Education

Bachelor’s degree in IT/CS or related

Tools

Veeam Backup & Replication

Active Directory

PowerShell

Splunk

FortiGate

Job description

IT Infrastructure & Systems Manager

We are seeking an experienced and highly motivated Senior IT Infrastructure Manager with at least 7 to 10 years experience to oversee, manage, and continuously improve the organization’s IT infrastructure, enterprise systems, network environment, and end-user computing services.

The successful candidate will ensure the availability, security, performance, and resilience of critical business systems while leading technical teams and supporting key stakeholders across the organization.

This role requires a strong blend of technical expertise, leadership capability, operational excellence, and stakeholder management skills, within a complex enterprise environment that includes financial, trading, and treasury systems.

Role Description

The IT Infrastructure & Systems Manager is a full-time role based in London with a hybrid working arrangement, combining on-site presence with some work from home. This role is responsible for managing and maintaining the organization’s core IT infrastructure, including servers, networks, storage, and cloud services. Day-to-day tasks include overseeing system administration, monitoring performance and availability, implementing security best practices, and coordinating backup and disaster recovery processes. The role involves leading and supporting IT operations, resolving complex technical issues, and ensuring that systems, applications, and services remain stable and secure. The IT Infrastructure & Systems Manager will collaborate with internal stakeholders, manage vendors and service providers, contribute to IT strategy and roadmaps, and document procedures, standards, and configuration changes.

Qualifications

• Strong foundation in Information Technology and IT Operations, including infrastructure design, capacity planning, and service management.
• Hands-on experience with System Administration and Troubleshooting across Windows and/or Linux environments, virtualization, and cloud platforms.
• Proficiency in Network Security, including firewalls, VPNs, endpoint protection, access control, and security monitoring.
• Proven ability to manage IT projects, prioritize tasks, and deliver improvements on time and within scope.
• Excellent communication and stakeholder management skills, with the ability to explain technical concepts to non-technical audiences.
• Experience leading or mentoring IT team members or support staff is highly desirable.
• Relevant certifications (e.g., ITIL, Microsoft, Cisco, CompTIA, or cloud certifications) are an advantage.
• Bachelor’s degree in Information Technology, Computer Science, or a related field, or equivalent practical experience.

Infrastructure & Systems Management

Administer, maintain, and optimize Windows and Linux server environments.

Manage VMware virtualized infrastructure (vSphere 8 and above).

Oversee enterprise backup and disaster recovery solutions using Veeam Backup & Replication.

Manage Veeam ONE monitoring and Veeam Recovery Orchestrator (VRO) environments.

Administer endpoint security and encryption solutions, including Symantec Endpoint Protection (SEP) and Symantec Endpoint Encryption (SEE).

Support endpoint DLP, SIEM, and security monitoring tools (e.g., Splunk, Tenable).

Manage patching processes using ManageEngine Patch Manager Plus.

Support Microsoft 365 services and related cloud technologies.

In depth understanding of Cyber security

Monitor system performance, capacity, availability, and infrastructure health.

Ensure compliance with IT governance, security policies, and operational standards.

End-User Computing Support

Provide advanced desktop, laptop, printer, Mobile device (iOS) and branch office IT support.

Deliver AV support for meeting rooms, conferencing, presentations, and collaboration systems.

Manage OS deployment, imaging, image creation, maintenance, and software packaging.

Administer Active Directory (AD), Group Policy Objects (GPOs) and user provisioning and NTFS permissions.

Support Microsoft 365 applications including Outlook, Teams, OneDrive, and SharePoint.

Resolve technical incidents and service requests in line with agreed SLAs.

Enterprise Applications & Financial Systems Support

Support and administer business-critical applications, including:

Bloomberg FXT and Refinitiv Eikon, Murex Treasury System, SWIFT Alliance Access (SAA), 1AML, SIBS, GFMS, COP

Support enterprise file synchronization and replication solutions (e.g., Syncovery, other SFTP).

Networking

Configure and support Cisco switches and routers.

Administer FortiGate firewall environments.

Strong network fundamentals: DNS, DHCP, TCP/IP, LAN/WAN, Routing and connectivity troubleshooting.

Monitor network performance, availability, and security posture.

Security & Endpoint Management

Support vulnerability management using tools such as Tenable.

Manage security monitoring and log analysis tools (e.g., Splunk).

Perform SSL/TLS certificate lifecycle management using OpenSSL.

Create and manage CSRs, certificate chains, and private keys.

Ensure adherence to cybersecurity policies, standards, and regulatory requirements.

Support physical access control systems (e.g., Paxton)

Governance, Documentation & Process Improvement

Develop, maintain, and enforce IT policies, standards, and operational procedures.

Produce system architecture diagrams, technical documentation, SOP’s, and performance reports.

Identify and drive opportunities for automation and service improvement.

Support technology planning, infrastructure modernization, and transformation initiatives.

Operating Systems

Windows 11

Windows Server 2019/2022 (or equivalent enterprise environments)

Red Hat Linux

Infrastructure & Virtualization

VMware vSphere / vCenter (v8.0.3 and above)

Veeam Backup & Replication

Veeam ONE, VRO

Microsoft Office 365

ManageEngine Patch Manager Plus

SAAS solutions

SQL Server

Security

Symantec Endpoint Protection (SEP)

Symantec Endpoint Encryption (SEE)

SentinelOne – EDR/ XDR

Endpoint DLP solutions

Firewall administration

Vulnerability management tools (e.g., Tenable)

SIEM tools (e.g., Splunk)

Networking

Cisco Switches and Routers

FortiGate Firewalls

LAN/WAN networking and routing

Hardware & Storage

Dell PowerEdge Servers

Dell PowerVault SAN Storage

Technical Competencies

Data analysis and operational reporting

Desktop and laptop support

Infrastructure monitoring and performance management

Certificate lifecycle management (SSL/TLS)

Windows imaging and deployment, GPO, NTFS

PowerShell scripting

SQL Server administration

Understanding of software development lifecycle (SDLC) and deployment processes

Architecture review and systems optimization

Asset management

7+ years of experience in enterprise IT infrastructure and systems administration.

Experience within financial services, banking, trading, or treasury environments.

Proven experience managing mission-critical infrastructure and applications.

Experience operating within regulated and security-focused environments.

Able to provide support to VIP stakeholders

This is a hybrid role with 3 days at the office in Central London.

Salary for this role will be in the range £60K - £65K.