IT Security Engineer

AtkinsRéalis; Epsom; On-site; GBP 50,000 - 70,000; Full time

Job summary

A global engineering services firm in the UK is seeking a Senior Infrastructure Engineer to manage on-premises technologies and act as a Subject Matter Expert. The ideal candidate has background in firewall management, SIEM and SOAR platforms, and Microsoft 365 security. Key responsibilities include managing infrastructure technologies, troubleshooting networks, and collaborating on complex projects. This role offers a competitive salary and benefits, with opportunities for training and professional development, in a supportive and inclusive work environment.

Benefits

Competitive salary

Employee rewards

Flexible working arrangements

Training and professional development

Qualifications

• Years of experience in infrastructure or security engineering roles.
• Strong problem-solving mindset and ability to work unsupervised.

Responsibilities

• Manage and maintain on-premises infrastructure technologies.
• Collaborate with team members on complex projects while independently owning specific technical domains.
• Respond effectively under pressure in a fast-paced environment.

Skills

Firewall management (Check Point, Palo Alto preferred)

SIEM and SOAR platforms (Splunk SOAR, LogRhythm)

Vulnerability management (Tenable)

Network troubleshooting (Cisco desirable)

Microsoft 365 security stack (required)

PowerShell scripting

Excellent communication skills

Job description

Job Description

We are seeking a highly skilled Senior Infrastructure Engineer to join our team and help distribute the existing workload. The successful candidate will work closely with other team members while acting as a Subject Matter Expert (SME) in one or more areas. This role requires a strong technical foundation combined with a problem‑solving mindset and the ability to work independently without micromanagement.

Your Role

Manage and maintain on‑premises infrastructure technologies, including:

• Firewall administration.
• SIEM and SOAR platforms.
• Network troubleshooting.
• Vulnerability management.
• Oversee and enhance security within the Microsoft 365 stack.
• Collaborate with team members on complex projects while independently owning specific technical domains.
• Respond effectively under pressure in a fast‑paced environment.

About you

• Years of experience in infrastructure or security engineering roles.
• Firewall management (Check Point, Palo Alto preferred).
• SIEM and SOAR platforms (Splunk SOAR, LogRhythm).
• Vulnerability management (Tenable).
• Network troubleshooting (Cisco desirable).
• Microsoft 365 security stack (required).
• Strong problem‑solving mindset and ability to work unsupervised.
• Excellent communication skills for team collaboration.

Desirable Skills

• PowerShell scripting.
• Familiarity with equivalent technologies if not exact brands.
• Exposure to automation and process improvement.

Reward & benefits

Explore the rewards and benefits that help you thrive – at every stage of your life and your career. Enjoy competitive salaries, employee rewards and a brilliant range of benefits you can tailor to suit your own health, wellbeing, financial and lifestyle choices. Make the most of a myriad of opportunities for training and professional development to grow your skills and expertise. And combine our hybrid working culture and flexible holiday allowances to balance a great job and fulfilling personal life.

Be rewarded. Find out more.

About AtkinsRéalis

We’re AtkinsRéalis, a world‑class engineering services and nuclear organization. We connect people, data and technology to transform the world’s infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants, designers, engineers and project managers, we can change the world. We’re committed to leading our clients across our various end markets to engineer a better future for our planet and its people.

Find out more.

Additional information

Security clearance

This role may require security clearance and offers of employment will be dependent on obtaining the relevant level of clearance. If this is necessary, it will be discussed with you at interview. The vetting process is delivered by United Kingdom Security Vetting (UKSV) and may require candidates to provide proof of residency in the UK of 5 years or longer. If applying to this role please do not make reference to (in conversation) or include in your application or CV, details of any current or previously held security clearance.

We are committed to creating a culture where everyone feels that they belong – a place where we can all be ourselves, thrive and develop to be the best we can be. So, we offer a range of family‑friendly, inclusive employment policies, flexible working arrangements and employee resource groups to support all employees. As an Equal Opportunities Employer, we value applications from all backgrounds, cultures and ability.

Worker Type

Employee

Job Type

Regular

At AtkinsRéalis, we seek to hire individuals with diverse characteristics, backgrounds and perspectives. We strongly believe that world‑class talent makes no distinctions based on gender, ethnic or national origin, sexual identity and orientation, age, religion or disability, but enriches itself through these differences.