Senior Infrastructure Engineer

Xantium; City Of London; On-site; GBP 60,000 - 80,000; Full time

Job summary

A leading tech firm is seeking a detail-oriented Senior Infrastructure Engineer to design and manage secure systems. This role involves collaborating with teams to align IT solutions, leading migrations, and automating administrative tasks. Candidates must have 5+ years of experience with Azure and Microsoft 365. Strong troubleshooting and communication skills are essential for this position. The role is based in London, United Kingdom.

Qualifications

• 5+ years experience with Azure/Entra ID, Exchange, and Microsoft 365.
• Proficiency in PowerShell and scripting automation.
• Strong troubleshooting skills across authentication and device management.

Responsibilities

• Providing expert support and aligning IT solutions with business goals.
• Maintaining detailed documentation of system configurations.
• Developing and enforcing identity and access management policies.

Skills

Expert support

Azure/Entra ID experience

PowerShell automation

Troubleshooting

Excellent communication

Education

Bachelor’s degree in Computer Science or related field

Tools

Microsoft Azure

Exchange

Intune MDM

Citrix

Job description

Overview

Xantium is seeking a detail-oriented Senior Infrastructure Engineer to design, implement, and manage critical systems supporting core business functions. The successful candidate will be responsible for architecting secure and scalable solutions for email, messaging and mobile devices within Xantium’s Microsoft Azure/Entra ID and Microsoft 365 environments.

Responsibilities

• Providing expert support and collaborating with cross-functional teams to align IT solutions with business goals while staying up to date on latest technologies
• Maintaining detailed documentation of system configurations and policies
• Developing and enforcing identity and access management policies (SSO, MFA, conditional access)
• Securing mobile devices with Intune MDM, including policy configuration and compliance
• Automating admin tasks using PowerShell and related scripting tools
• Troubleshooting complex issues in authentication, messaging, and infrastructure
• Leading migrations and upgrades for identity and messaging systems

Qualifications

• Bachelor’s degree in Computer Science, IT, Engineering, or a related field
• 5+ years experience with Azure/Entra ID, Exchange (on-prem and online), and Microsoft 365
• Proficiency in PowerShell and scripting automation; Python or Linux shell scripting a plus
• Experience with hybrid cloud and on-prem infrastructure; Citrix preferred
• Strong troubleshooting skills across authentication, messaging, and device management
• Knowledge of identity and access management concepts including SSO, MFA, and conditional access
• Excellent communication and collaboration skills
• Willingness to participate in on-call rotation for escalated support