IT Systems Administrator Senior

Sedgwick; Remote; GBP 80,000 - 100,000; Full time

Job summary

A leading insurance provider is seeking a Senior Active Directory Engineer to join their team. In this dynamic role, you will design and optimize the Active Directory infrastructure while ensuring seamless integration of identity services within a hybrid environment. Ideal candidates will have deep expertise in Active Directory and Entra ID, advanced troubleshooting skills, and a proactive mindset to enhance performance. Competitive salary and benefits are offered with flexible working options.

Benefits

Self Invested Personal Pension Scheme (SIPP)

Holiday allowance of 25 days plus bank holidays

Flexible working from home or office

Private healthcare plan

Employee assistance programme

Qualifications

• Deep experience designing, managing, and supporting complex on‑premises AD environments.
• Strong understanding of Entra ID and integration between on‑premises and cloud directory services.
• Skilled in diagnosing and resolving issues related to AD replication, trusts, Group Policy, LDAP, Kerberos, DNS, and AD security.

Responsibilities

• Lead the design, optimisation, and support of the Active Directory infrastructure.
• Troubleshoot complex issues across multi‑forest environments.
• Collaborate with teams across IT for seamless integration between identity services and business‑critical systems.

Skills

Active Directory expertise

Hybrid identity knowledge

Advanced troubleshooting

Migration experience

Security best practices

Performance monitoring

Scripting skills

Collaboration

Leadership

Incident response

Windows Server knowledge

IAM familiarity

Networking fundamentals

Advanced Excel

Optional tooling knowledge

Job description

IT Systems Administrator Sr

By joining Sedgwick, you'll be part of something truly meaningful. It’s what our 33,000 colleagues do every day for people around the world who are facing the unexpected. We invite you to grow your career with us, experience our caring culture, and enjoy work-life balance. Here, there’s no limit to what you can achieve.

Newsweek Recognizes Sedgwick as America’s Greatest Workplaces National Top Companies

Certified as a Great Place to Work®

Fortune Best Workplaces in Financial Services & Insurance

Job Location: EMEA – Remote
Job Type: Permanent
Remuneration: Competitive salary commensurate with seniority, skills, experience, and qualifications

Drive the future of our hybrid identity platform as a Senior Active Directory Infrastructure Engineer leading innovation, security, and next‑level performance.

We are looking for a highly skilled Senior Active Directory Infrastructure Engineer to take ownership of our hybrid identity environment and drive it forward. In this role, you will lead the design, optimisation, and support of both our on‑premises Active Directory infrastructure and our Entra ID environment, ensuring they operate securely, reliably, and efficiently. You will play a key part in shaping the future of our directory services, bringing a proactive and solutions‑focused mindset to identify improvements, enhance performance, and deliver initiatives from initial concept through to successful completion.

This is a hands‑on technical position where your deep expertise in Active Directory, Entra ID, and related identity technologies will be essential. You will troubleshoot complex issues across multi‑forest environments, support domain migrations and decommissioning efforts, and maintain the health and stability of our hybrid directory landscape. Collaboration is central to the role, and you will work closely with teams across IT to ensure seamless integration between identity services and business‑critical systems. You will also serve as a trusted advisor and mentor, providing guidance to junior engineers and contributing to the continuous growth of the team.

The position offers the opportunity to work with modern technologies in a dynamic hybrid environment while influencing long‑term strategy and best practices around identity and access. If you thrive in roles where autonomy, technical depth, and continuous improvement are key, this position provides a platform to make a significant and lasting impact.

What you’ll Bring:

• Active Directory expertise: Deep experience designing, managing, and supporting complex on‑premises AD environments across multiple forests.
• Hybrid identity knowledge: Strong understanding of Entra ID and integration between on‑premises and cloud directory services.
• Advanced troubleshooting: Skilled in diagnosing and resolving issues related to AD replication, trusts, Group Policy, LDAP, Kerberos, DNS, and AD security.
• Migration experience: Hands‑on background with domain migrations, object transfers, and decommissioning legacy domains.
• Security best practices: Proven ability to implement and maintain policies that protect directory services and identity infrastructure.
• Performance monitoring: Ability to monitor, analyse, and optimise domain controller and directory service performance.
• Scripting skills: Proficiency with PowerShell for automation, configuration, and administrative tasks.
• Collaboration: Strong communication skills and the ability to work effectively with cross‑functional IT teams.
• Leadership: Experience mentoring junior engineers and guiding peers on identity‑related topics.
• Incident response: Willingness to participate in a 24×7 on‑call rotation and perform off‑hours changes.
• Windows Server knowledge: Advanced experience with Windows Server 2016–2025 in both physical and virtual environments.
• IAM familiarity: Understanding of related solutions such as Microsoft Identity Manager and PKI infrastructure.
• Networking fundamentals: Basic network troubleshooting proficiency.
• Advanced Excel: Strong analytical abilities using Excel for reporting and data handling.
• Optional tooling knowledge: Experience with Google SecOps, WSUS, or PRTG monitoring is beneficial.

What we’ll give you for this role:

Remuneration & more

• Competitive salary taking into account skills, experience and qualifications
• A Self Invested Personal Pension Scheme (SIPP)
• Holiday allowance of 25 days plus bank holidays
• Flexible working from our office or your home

Health & support

• Private healthcare plan (including pre-existing conditions)Life assurance
• Group Income Protection

Other benefits

• Voluntary benefits – dental cover, cycle to work scheme, season ticket loan, wellbeing and digital GP applications
• Employee assistance programme for employee wellbeing
• Discounts on various products and services

This isn't just a position, it's a pivotal role in shaping our industry

At Sedgwick, not only will you be working behind the scenes for some of the UK's most trusted insurance brands helping to resolve millions of claims every year, you'll also be an architect of tomorrow's insurance landscape with Sedgwick University. Our proprietary offering is the most comprehensive training and development program in the industry with more than 15,000 courses on demand, training specific to roles, and opportunities to continue your formal education – all available to you starting from your very first day.

You’ll join a community passionate about making a difference, where every role contributes to a larger mission; protecting people and businesses. This isn't just a job; it's an opportunity to shape the future of insurance.

Next steps for you:

Think we'd be a great match? Apply now – we want to hear from you.

If you’re unsure whether you have all the skills needed then do apply – we are looking for all backgrounds from seasoned professionals to those returning to the workforce, and everyone in‑between.

Not only that, we are proud to have a zero tolerance policy towards discrimination of any kind regardless of age, disability, gender identity, marital/ family status, race, religion, sex or sexual orientation.

After the closing date we will review all applications and may select some applicants for an interview (which may be virtual, or in‑person).

#LI-REMOTE

Sedgwickis an Equal Opportunity Employer.

The statements contained in this document are intended to describe the general nature and level of work being performed by a colleague assigned to this description. They are not intended to constitute a comprehensive list of functions, duties, or local variances. Sedgwick retains the discretion to add or to change the duties of the position at any time.