Senior Support Engineer

Gresham; Southampton; Hybrid; GBP 50,000 - 70,000; Full time

Benefits offered by this job

Diverse and inclusive workplace

Commitment to career development

Job summary

Gresham, a global financial services technology company, is searching for a Senior Support Engineer to oversee Microsoft 365, network infrastructure, and cloud services. This role balances routine operations with exciting transformation projects, perfect for engineers interested in both steady-state and strategic initiatives.

You'll provide advanced support for Microsoft 365 services like Exchange and Teams while managing identity and access management processes. Strong technical skills, particularly in cloud solutions and networking, are essential for success in this dynamic environment.

Qualifications

• 5+ years supporting Microsoft 365 / Office 365 in an enterprise environment.
• Strong knowledge of Exchange Online, Teams, SharePoint, OneDrive, and Intune.
• Excellent troubleshooting and problem-solving skills.

Responsibilities

• Provide senior-level support for Microsoft 365 services.
• Manage identity lifecycle and configure authentication policies.
• Support cloud infrastructure and maintain hybrid cloud connectivity.

Skills

Microsoft 365 expertise

AWS experience

PowerShell scripting

IP networking and troubleshooting

Authentication and IAM knowledge

Leadership and mentorship

Education

Certifications in Microsoft 365, AWS, or networking

Tools

Microsoft Entra ID

Microsoft Intune

SD-WAN

ITSM platforms

Job description

Gresham is a global financial services technology company specialising in enterprise data automation. We help financial institutions ensure that their operational, regulatory and management data is complete, accurate, timely and fully auditable — particularly within complex environments where data is distributed across multiple systems.

Our solutions automate data controls, reconciliations, workflows and exception management, enabling clients to reduce operational risk, strengthen data governance and enhance confidence in reporting across highly regulated environments. Serving both buy-side and sell-side organisations worldwide, Gresham partners with clients to deliver trusted, transparent and resilient data operations.

Job Purpose

Gresham Technologies is seeking an experienced Senior Support Engineer to take ownership of our Microsoft 365 estate, network infrastructure, and cloud services. This is a business-as-usual (BAU) role with exposure to transformation projects, providing an excellent opportunity for an engineer who wants to work across both steady-state operations and strategic initiatives.

You’ll be the technical expert for Microsoft 365, remote access solutions and cloud infrastructure (AWS), supporting our users and ensuring the reliability and security of our IT services.

We are open to locations in the UK - London, Manchester, Southampton or Bristol.

Key Responsibilities

• Provide senior-level support for Exchange Online, Teams, SharePoint, OneDrive, and Outlook
• Manage Microsoft Entra ID (Azure AD) including user provisioning, conditional access, and MFA
• Administer Microsoft Intune for device management and application deployment
• Monitor service health, respond to incidents, and elevate to Microsoft support as needed
• Configure security features and manage external collaboration scenarios

Network Infrastructure & Remote Access

• Manage VPN infrastructure and remote connectivity solutions
• Strong IP networking: routing, subnets, VLANs, DNS, DHCP, and troubleshooting
• Work with ISPs and WAN providers on circuit provisioning and fault resolution
• Support SD-WAN configurations and monitor network performance
• Support AWS cloud infrastructure (EC2, S3, VPC, IAM, CloudWatch) – or Azure equivalent
• Maintain hybrid cloud connectivity between on‑premises and cloud environments
• Monitor cloud resource utilization, cost optimization, and performance
• Support cloud security configurations including security groups and IAM policies
• Participate in backup, disaster recovery, and business continuity activities

Identity & Access Management

• Manage identity lifecycle (onboarding, offboarding, role changes)
• Configure authentication policies, SSO integrations, and access controls
• Troubleshoot authentication issues across applications and platforms
• Support MFA deployments and RBAC configurations
• Contribute to infrastructure projects (network upgrades, cloud migrations, security enhancements)
• Implement automation using PowerShell and scripting
• Document technical configurations and create knowledge base articles
• Support transformation activities related to business growth and organizational changes
• Provide technical leadership and mentorship to junior engineers and service desk team
• Act as an escalation point and technical authority for complex infrastructure issues
• 5+ years supporting Microsoft 365 / Office 365 in an enterprise environment
• Strong knowledge of Exchange Online, Teams, SharePoint, OneDrive, Entra ID, and Intune
• AWS cloud experience (EC2, S3, VPC, IAM) – or Azure equivalent
• Good PowerShell scripting for automation and administration
• Understanding of IAM concepts (SSO, SAML, OAuth, MFA)
• Excellent troubleshooting and problem-solving skills
• Strong communication skills and ability to explain technical concepts clearly
• Leadership qualities with ability to mentor and guide junior team members
• Collaborative mindset and team player
• Familiarity with Python scripting alongside PowerShell
• Experience with SASE/SSE technology – Zscaler, Palo Alto
• ITSM platform experience and monitoring tools
• Certifications in Microsoft 365, AWS, or networking (e.g., MS-102, AWS SAA, CCNA)

At Gresham, we are committed to building a diverse and inclusive workforce that reflects the communities we serve. We actively encourage applications from individuals of all backgrounds and are dedicated to providing a workplace where everyone feels valued, respected and supported.

We make employment decisions based on merit, skills and potential, and do not discriminate based on any protected characteristic. We are also committed to making reasonable adjustments throughout the recruitment process and employment lifecycle.