Seniro Unix Engineer

Undisclosed; Knutsford; Hybrid; GBP 80,753 - 105,960; Full time

Job summary

A leading technology services provider in the UK is seeking a Senior Unix/Linux Engineer to support critical infrastructure platforms in a hybrid model. You will be responsible for L2/L3 support, system hardening, and compliance in a regulated environment. The ideal candidate has strong Unix/Linux expertise, particularly with legacy systems, and a focus on security best practices. This role offers a competitive daily rate and emphasizes collaboration with global teams to enhance platform security and stability.

Qualifications

• Strong hands-on experience administering Unix/Linux in enterprise environments.
• Experience in legacy Unix variants like AIX or Solaris.
• Solid understanding of system hardening and security practices.

Responsibilities

• Provide L2/L3 support for Unix/Linux infrastructure platforms.
• Perform secure build and maintenance of Unix/Linux servers.
• Implement and maintain security controls, including patching.

Skills

Unix/Linux administration

System hardening

Security best practices

OS patching

User and privilege management

Process monitoring

Regulated environments experience

Tools

AIX

Solaris

HP UX

CompTIA Security+

CISSP

Job description

Duration: contract to run until 30/11/2026

Location: Knutsford, hybrid 3 days per week onsite

Rate: up to £506 p/d Umbrellainside IR35

The SI Unix Engineer is a senior Unix/Linux infrastructure specialist with a strong focus on platform security, compliance, and stability within highly regulated enterprise environments. The role supports critical Unix/Linux platforms, including legacy and modern systems, and plays a key part in data centre optimisation, migration, and security hardening initiatives.

This position requires deep hands-on Unix/Linux expertise combined with strong security awareness, operational discipline, and the ability to communicate effectively with global stakeholders.

Key Responsibilities

• Provide L2/L3 support for Unix/Linux infrastructure platforms in production, including business critical and regulated systems
• Perform secure build, configuration, hardening, and ongoing maintenance of Unix/Linux servers
• Support data centre optimisation, migration, and transformation programmes, including platform stabilisation and risk reduction activities
• Implement and maintain security controls, including access management, patching, vulnerability remediation, and configuration compliance
• Participate in incident, problem, and change management, ensuring adherence to ITIL and security governance standards
• Support audit, risk, and compliance activities, including evidence gathering and remediation of audit findings
• Work closely with security, platform, and architecture teams to ensure platforms meet enterprise security and operational standards
• Create and maintain technical documentation, runbooks, and operational procedures
• Contribute to continuous improvement initiatives to enhance platform reliability, security, and operational efficiency

Technical Skills & Experience (Essential)

• Strong hands-on experience administering Unix/Linux platforms in large enterprise environments
• Unix variants (e.g. AIX, Solaris, HP UX or equivalent legacy platforms)
• Solid experience with system hardening and security best practices on Unix/Linux
• Strong understanding of:
• OS patching and lifecycle management
• User and privilege management (sudo, PAM, RBAC)
• File system, storage, and performance management
• Process monitoring, troubleshooting, and root cause analysis
• Experience working in regulated or security sensitive environments (e.g. banking, financial services, critical infrastructure)
• Familiarity with vulnerability management, security scanning, and remediation processes
• Experience supporting data centre migration or transformation programmes is highly desirable
• Working knowledge of ITIL processes (incident, problem, change)

Certifications (Preferred, not mandatory)

• Red Hat Certified Engineer (RHCE) or equivalent Linux certification
• Security focused certifications (e.g. CompTIA Security+, CISSP – foundational exposure acceptable)

Soft Skills & Behavioural Attributes

• Strong verbal and written communication skills in English
• Ability to explain technical issues clearly to both technical and non-technical stakeholders
• Proven ability to work effectively in global, distributed teams
• Strong analytical and problem solving mindset
• High attention to detail, particularly in security and compliance driven environments

All profiles will be reviewed against the required skills and experience. Due to the high number of applications we will only be able to respond to successful applicants in the first instance. We thank you for your interest and the time taken to apply!