London 2nd Line IT Support Technician – Security & Collaboration

Sumer; City Of London; On-site; GBP 32,000 - 42,000; Full time

Job summary

Sumer is seeking a proactive IT Support Technician (2nd Line) to join our Simmons Gainsford hub in London. This role blends on-site end-user support with collaboration across our central IT function to ensure reliability, security, and performance of our growing technology environment.

You will handle day-to-day operations, deliver excellent user support, and maintain local infrastructure, including Windows 11 endpoints, Microsoft 365, Mimecast, and security tooling as part of a broader security

Qualifications

• Solid experience in a 2nd Line role within a multisite or professional services environment.
• Good working knowledge of Windows and Microsoft 365.
• Comfortable working with a ticketing system.
• Strong customer service mindset with clear communication skills.
• Willingness to learn, follow procedures, and escalate issues when appropriate.
• Exposure to Azure administration, conditional access, security policies.

Responsibilities

• Deliver 2nd Line troubleshooting for laptops, desktops, peripherals, applications, and performance issues.
• Manage support tickets, resolving issues at first contact where possible.
• Communicate clearly with users, providing updates and managing expectations.
• Manage user lifecycle processes, including onboarding, leavers, access provisioning, and permissions updates.
• Configure workstations, profile laptops, and ensure new starters receive an effective technical induction.
• Administer Active Directory and Microsoft 365, including mailbox setup, distribution lists, and security groups.
• Perform routine system checks, patching validation and monitoring activities.
• Maintain accurate documentation for systems, configurations, and support procedures.
• Support technical activities related to vulnerability management and remediation.
• Work with tools such as Sentinel one, Qualys, Mimecast, and Microsoft 365 Security Portal.
• Assist with triage and respond to security alerts under the direction of central security team.
• Coordinate with third‑party vendors and external partners to resolve technical issues or support local projects.
• Support initiatives relating to: Microsoft Windows 11 endpoint environments, Microsoft 365 administration and apps, Mimecast web filtering and email security, Vulnerability scanning and patching using Qualys, Hardware configuration to organisational standards.

Skills

Windows

Microsoft 365

Ticketing system

Customer service

Communication

Willingness to learn

Tools

Azure administration

Qualys

Mimecast

SentinelOne

Microsoft 365 Security Portal

Job description

Sumer is seeking a proactive IT Support Technician (2nd Line) to join our Simmons Gainsford hub in London. This role blends on-site end-user support with collaboration across our central IT function to ensure reliability, security, and performance of our growing technology environment.

You will handle day-to-day operations, deliver excellent user support, and maintain local infrastructure, including Windows 11 endpoints, Microsoft 365, Mimecast, and security tooling as part of a broader security