Senior Systems Engineer User Support

Arch Capital Group; Southampton; On-site; GBP 68,000 - 108,000; Full time

Job summary

Arch Capital Group is seeking a Senior Systems Engineer (Team Lead) to oversee infrastructure operations in the United Kingdom. You will manage Active Directory, DNS, DHCP, PKI, and cloud environments with Azure IaaS/PaaS and Office 365. This role requires leadership across IT operations and security initiatives.

You will collaborate with cloud, compute, and IT operations teams, drive change management, and guide remediation of security gaps while ensuring high availability and performance.

Qualifications

• Minimum 5 years in a production environment.
• 3–5 years managing and troubleshooting authentication services.
• 5+ years automation experience with PowerShell, scripts and Terraform.
• At least 5 years of Advanced Active Directory experience.
• Knowledge of AKS, Kerberos, LDAP, AD, DNS, DHCP.

Responsibilities

• Administer and operate the infrastructure.
• Manage Active Directory, DNS, DHCP, and PKI services.
• Work with Azure IaaS, PaaS, and Office 365/Exchange Online.
• Install and maintain hardware/software on a virtualized Windows network.
• Develop processes to maintain availability, security, and quality.

Skills

Team leadership

Communication

Time management

Multitasking

Cross-training

Adaptability

Technologist mindset

Security awareness

Problem solving

Documentation

Education

MCSA or equivalent

Tools

PowerShell

Terraform

VMware

Active Directory

Azure

Office 365

DNS

DHCP

GPOs

PKI

MFA

AKS

Job description

Salary: £68,000 - 108,000 per year

Requirements:

• We require a minimum of 5 years of relevant experience supporting a production environment.
• We require 3 to 5 years of practical experience managing and troubleshooting authentication services.
• We require 5 or more years of strong automation experience, including PowerShell, scripts, and Terraform.
• We require at least 5 years of advanced Active Directory experience.
• We require knowledge of AKS, Kerberos, LDAP, Active Directory, DNS, and DHCP.
• We require experience implementing backup and restore, disaster recovery, and recovery strategies.
• We require strong familiarity with security issues in network computing and experience implementing security systems and controls.
• We require strong knowledge of MFA, Enterprise Apps, IaaS, and PaaS in Microsoft Azure.
• We require expert knowledge of Active Directory and GPOs in a Windows Server 2019/2016 environment.
• We require significant experience with Windows operating systems scripting and troubleshooting.
• We require experience with user and security administration in a Windows environment.
• We require extensive experience maintaining and administering VMware virtualized systems.
• We require a technologist mindset with the ability to work on complex projects.
• We require strong organization, time management, and multitasking skills.
• We require excellent written and oral communication skills.
• We require the ability to cross-train team members.
• We require the ability to adapt to a highly dynamic environment with complex and shifting priorities.
• We require experience in a Team Lead role.
• Industry-specific training or a designation such as MCSA, or equivalent, is preferred.
• A technical degree or certifications are preferred but not required.

Responsibilities:

• We are responsible for the administration and operation of our infrastructure.
• We manage Active Directory, DNS, DHCP, and PKI services.
• We work with strong Azure IaaS and PaaS, and Office 365/Exchange Online environments.
• We install and maintain hardware and software on a virtualized Windows network.
• We develop processes and procedures to maintain high levels of availability, security, and quality in managed environments.
• We lead the security workstream of our Active Directory consolidation program.
• We identify risks and provide remediation guidance to help deliver a hardened and sustainable Active Directory environment.
• We deliver scripted solutions to support discovery and remediation of ad hoc security gaps.
• We follow all procedures and policies related to our Change Management system.
• We develop proactive capacity forecasts to prevent outages.
• We manage crisis situations to a satisfactory conclusion, even under stress.
• We provide guidance on information security risk and compliance topics.
• We serve as an escalation point for complex production, application, and system issues.
• We provide troubleshooting guidance and direction for escalated issues.
• We accommodate schedule flexibility for escalations and occasional non-core business hours changes.
• We plan, facilitate, and participate in meetings across all organizational levels.
• We collaborate with cloud, compute, messaging, and IT operations teams.
• We communicate business and technical information to a wide range of audiences.
• We document and present information clearly.
• We cross-train team members and share knowledge across our global team.

Technologies:

• Active Directory
• Azure
• Cloud
• Hardware
• IaaS
• Support
• LDAP
• Network
• Office 365
• PaaS
• PowerShell
• Security
• Terraform
• VMware
• Windows
• Citrix
• Firewall
• LAN
• Load Balancing
• React
• VPN

More:

We are a company with a culture rooted in collaboration, expertise, and innovation, and we aim to promote progress and inspire our clients, employees, investors, and communities to achieve their greatest potential. Our work is the catalyst that helps others achieve their goals. The Senior Systems Engineer (Team Lead) role sits within our Cloud & Compute Engineering group and works closely with our Cloud, Compute, Messaging Engineering Teams, and Senior Systems Engineers of IT Operations. This is a full-time role based in the United Kingdom, with locations including Birmingham, Colchester, London, Manchester, Bristol, Home Base, Sheffield, Southampton, Kent, St. Albans, Leeds, Glasgow, and Redhill. We are looking for someone who enjoys solving complex business problems and working with talented colleagues in an innovative environment.

last updated 40 week of 2026