Senior Systems Engineer

Eze Castle Integration, Inc.; Greater London; On-site; GBP 85,000 - 110,000; Full time

Job summary

ECI is seeking a Senior Systems Engineer to drive technology programs, including Cloud implementation and support, desktop engineering escalation and networking for a defined client portfolio. Hybrid work with a London-area preference.

You’ll lead migrations, manage complex issues, and contribute to the internal knowledge base while delivering best-practice security configurations such as MFA and conditional access.

Qualifications

• Bachelor’s degree in Information Technology or 6+ years in a technology administration role.
• Advanced knowledge of Windows Server and Windows 10/11.

Responsibilities

• Provide advanced support of cloud infrastructures such as Microsoft 365/Azure (Azure AD, Exchange Online, SharePoint Online, OneDrive for Business, Teams, Intune)
• Act as Technical Lead for migrations, implementations, relocations, etc
• Document processes and SOPs; contribute to internal knowledge base and runbooks
• Audit client environments and provide technical recommendations
• Perform system maintenance including patching and vulnerability remediation
• Interface with RMM and mobile device management tools

Skills

Microsoft 365/Azure

Windows Server

Active Directory

VMware vSphere/Hyper-V

Incident response

Education

Bachelor’s degree in IT or related field

6+ years technology admin experience

Tools

Azure AD

Exchange Online

SharePoint Online

OneDrive for Business

Intune

Job description

Posted Thursday, July 30, 2026 at 11:00 PM

ECI is the leading global provider of managed services, cybersecurity, and business transformation for mid-market financial services organizations across the globe. From its unmatched range of services, ECI provides stability, security and improved business performance, freeing clients from technology concerns and enabling them to focus on running their businesses. More than 1,000 customers worldwide with over $3 trillion of assets under management put their trust in ECI.

At ECI, we believe success is driven by passion and purpose. Our passion for technology is only surpassed by our commitment to empowering ouremployees around the world.

The Opportunity:

As a Senior Systems Engineer, you will play a key role in our technical delivery team to drive the technology programs, including Cloud implementation and support, desktop engineering escalation and networking for a defined portfolio of clients. Using latest and greatest technologies and solutions, you will support our client’s innovation by following a set of standards and best practices in a rapidly evolving technology landscape. In this capacity you will play a critical role in our rapidly expanding global support network.

This is a hybrid opportunity with a strong preference for candidates to based in the London area.

What you will do:

• Provide advanced support of cloud infrastructures such as Microsoft 365/Azure (Azure AD, Exchange Online, SharePoint Online, OneDrive for Business, Teams, Intune)
• Collaborate with, and act as a tier 3 escalation point for Client Technology Management, Service Desk, Engineering, and other client support teams
• Implement and manage enterprise mail platform and security systems such as Microsoft Exchange or Exchange Online
• Act as a Technical Lead for migrations, implementations, relocations, etc
• Take ownership of complex technical challenges and provide long term fixes based on root cause analysis
• Document processes and procedures which explain system functionality or regular tasks to contribute to our internal knowledge base including architecture diagrams, runbooks, and standard operating procedures (SOP)
• Audit undocumented client environments and provide technical recommendations based on findings
• Apply best-practice configurations to client security platforms such as Azure Active Directory Conditional Access, DUO Multifactor Authentication (MFA) services
• Perform system maintenance tasks including software and operating system patching, software version upgrades, critical patch applications, and vulnerability remediation
• Provide advanced support of Active Directory such as Domain Controller upgrades, Group Policy creation, scheduled software deployments, network policy maintenance, and certificate management
• Interface with common technology support tools such as Remote Monitoring and Management (RMM), Mobile Device/Mobile Application Management, Anti-Virus/Anti-Malware

Who you are:

• Bachelor’s degree in an Information Technology related field, or a minimum of 6+ years comparable experience in a technology administration role
• Advanced knowledge of Microsoft Operating Systems such as Windows Server and Windows 10/11
• Advanced administration experience with Public Cloud platforms with focus in Microsoft 365 and Azure (Azure AD, Exchange Online, SharePoint Online, OneDrive for Business, Teams, Intune)
• Experience in administration of e-mail platforms and security integrations such as Exchange Online
• Experience in virtualization administration on platforms such as VMware vSphere and Hyper-V
• Proficient in incident response management during security events and high-priority escalations, as well as disaster recovery and business continuity activations
• English written and spoken language skills required.

Bonus points if you have:

• Experience with Managed Service Providers (MSP) preferred
• Financial Services or Life Science industry experience a plus

ECI’s culture is all about connection - connection with our clients, our technology and most importantly with each other. In addition to working with an amazing team around the world, ECI offers a competitive compensation package and so much more! If you believe you’d be a great fit and are ready for your best job ever,we’d like to hear from you!

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