Senior Infrastructure Engineer

Senior Infrastructure Engineer – Windows Team

12 Month Contract

Hybrid – London (Must be London-based)

Financial Services Experience Essential

Day Rate: £550–£750 per day (Inside IR35, dependent on experience)

Overview

We are seeking a Senior Infrastructure Engineer to join a high-performing Windows Engineering team within a global financial services investment bank. This role will provide senior-level engineering support and project contribution across a complex, enterprise-scale Windows and virtualised infrastructure estate.

Operating within a fast-paced, highly regulated environment, the successful candidate will play a key role in maintaining platform stability, security, resilience, and operational discipline across the estate. This is a hands-on senior engineering role combining BAU ownership with strategic infrastructure improvement initiatives.

Candidates must have prior experience within financial services and be comfortable operating in high-pressure, audit-sensitive environments.

Key Responsibilities

Senior Operational Engineering

• Provide senior-level support across the global Windows Server estate, ensuring availability, performance, patching, configuration, and incident resolution.
• Own and troubleshoot VMware ESX/vSphere environments, including lifecycle management and optimisation.
• Support Azure services within a production footprint (PaaS, ExpressRoute, and potential cloud desktop initiatives).
• Maintain and support core on-premise infrastructure including:
• Microsoft O365 (Teams, Exchange, OneDrive and associated enterprise application configurations)
• Omnissa Horizon VDI
• Cisco UCS compute platforms
• Pure Storage arrays
• Lead resolution of complex infrastructure issues across Windows, virtualisation, storage, and networking layers.
• Execute upgrades, performance tuning, and platform optimisation initiatives.
• Research, assess, and apply security fixes and patches in line with industry and regulatory best practices.

Project & Platform Delivery

• Contribute to infrastructure rationalisation and security improvement programmes.
• Support platform migrations, lifecycle management, and upgrade initiatives.
• Identify opportunities to reduce technical debt and improve operational efficiency.
• Collaborate with architecture, security, and engineering teams to implement strategic improvements.

Governance & Regulatory Alignment

• Ensure compliance with internal audit, security, and regulatory standards in a financial services environment.
• Maintain high-quality documentation, diagrams, and operational artefacts.
• Participate in structured change management processes, ensuring changes are risk assessed and executed safely.

Core Skills & Experience

Essential

• Extensive hands-on experience with VMware ESX/vSphere administration, troubleshooting, and lifecycle management.
• Strong expertise across Windows Server (2016–2022), including:
• Active Directory, DNS, DHCP, Group Policy
• Failover Clustering
• Certificate Services
• File and Print Services
• Advanced PowerShell scripting
• Proven experience working within financial services or a similarly regulated, high-pressure enterprise environment.
• Operational knowledge of:
• Cisco UCS
• Pure Storage
• Omnissa Horizon VDI
• Experience supporting Azure IaaS/PaaS in production environments.
• Strong troubleshooting capability across multi-layered infrastructure stacks.
• Experience with monitoring, alerting, capacity management, and performance tuning.

Desirable

• Experience in infrastructure rationalisation or transformation programmes.
• Knowledge of security hardening standards and regulatory frameworks (FCA, SOX, GDPR).
• Strong automation mindset with PowerShell or infrastructure scripting experience.
• Understanding of networking fundamentals (Cisco, VLANs, load balancers, etc.).

Candidate Profile

• Senior-level engineer comfortable operating in enterprise-scale environments.
• Calm and effective under pressure within a regulated financial services setting.
• Detail-oriented with strong documentation discipline.
• Proactive, analytical, and solutions-focused.
• London-based and able to work hybrid.