Senior Systems Engineer, User Support

Arch Capital Group; Colchester; On-site; GBP 50,000 - 75,000; Full time

Job summary

A leading company in the insurance sector is seeking a Senior Systems Engineer to oversee their infrastructure operations in Colchester. This role requires extensive experience in Active Directory, Azure, and VMware, coupled with strong communication and leadership skills. The ideal candidate will manage projects to completion, ensure security consolidation, and collaborate with various engineering teams to enhance system performance and reliability. If you have a minimum of 5 years in a production environment and a passion for technology, we want to hear from you.

Qualifications

• Minimum 5 years supporting a production environment.
• 3-5 years troubleshooting authentication services.
• 5+ years automation experience (PowerShell/Scripts/Terraform).

Responsibilities

• Responsible for administration and operation of infrastructure.
• Collaborate with Cloud and Compute Engineering Teams.
• Lead Active Directory security consolidation.

Skills

Active Directory

PowerShell scripting

MFA

Azure

Windows security

VMware

Office 365

Disaster recovery

LDAP

Communication skills

Education

MCSA or equivalent training

Technical degrees or certifications (preferred)

Job description

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Senior Systems Engineer, User Support, Colchester

Client: Arch Capital Group

Location: Colchester, United Kingdom

Job Category: Other

EU work permit required: Yes

Job Reference: f8e287c77b19

Job Views: 4

Posted: 29.06.2025

Expiry Date: 13.08.2025

Job Description:

With a company culture rooted in collaboration, expertise, and innovation, 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. In short, We Enable Possibility℠.

The Senior Systems Engineer (Team Lead) is responsible for the administration and operation of the firm’s Infrastructure. This role requires in-depth knowledge of Active Directory, Azure, MFA, VMware ESX, Windows security, and related technologies. The candidate will be part of the Cloud & Compute Engineering group. Must be a self-starter, experienced in managing projects to completion, well-organized, and possess strong communication skills. This position collaborates closely with the Cloud, Compute, and Messaging Engineering Teams and Senior Systems Engineers of IT Operations.

Job Functions:

• Strong PowerShell scripting experience and operational responsibility over Active Directory, DNS, DHCP, and PKI services.
• Experience with Azure IaaS + PaaS and Office 365/Exchange Online.
• Install and maintain hardware and software on a virtualized Windows network.
• Develop processes and procedures to ensure high availability, security, and quality of managed environments.
• Lead Active Directory security consolidation; identify risks, provide remediation guidance, and deliver scripted solutions for security gaps.
• Follow all procedures and policies related to Change Management.
• Develop capacity forecasts to prevent outages.
• Manage crisis situations effectively, even under stress.
• Provide guidance on information security risk and compliance.
• Serve as escalation point for troubleshooting complex issues.
• Be flexible with schedule to handle escalations and occasional non-core hours.

Required Skills:

• Minimum 5 years supporting a production environment.
• 3-5 years troubleshooting authentication services.
• 5+ years automation experience (PowerShell/Scripts/Terraform).
• Advanced Active Directory experience.
• Knowledge of AKS, Kerberos, LDAP, DNS, DHCP.
• Experience with backup/restore, disaster recovery strategies.
• Security systems and controls implementation experience.
• Strong MFA, Enterprise Apps, IaaS, PaaS in Azure knowledge.
• Expertise in Active Directory, GPOs in Windows Server environments.
• Scripting and troubleshooting in Windows OS.
• Experience with Windows user/security admin, VMware, Microsoft Exchange, HP Proliant Servers, Linux, Load Balancers, AWS, and cloud security tools.

Communication Skills:

• Excellent interpersonal and listening skills.
• Effective communication of technical and business info.
• Ability to engage with offshore and development teams.
• Good documentation and presentation skills.
• Professional interaction with management.

Leadership Skills:

• Ability to plan, facilitate, and participate in meetings across organizational levels.
• Contribute to a high-performance team culture, leading by example.
• Share knowledge/resources, educate team members.
• Team player with strong prioritization skills.
• Results-driven, independent, self-starter, with team lead experience.

Education and Training:

• Industry-specific training such as MCSA or equivalent.
• Technical degrees or certifications preferred but not mandatory.