Associate Principal Maintenance & Support Engineer

Unisys; Milton Keynes; Hybrid; GBP 85,000 - 120,000; Full time

Job summary

Unisys in the United Kingdom seeks an experienced Associate Principal Maintenance & Support Engineer to join a secure team. This senior role focuses on maintaining service availability, resolving complex issues, and supporting mission-critical systems across a secure infrastructure.

The role is primarily office-based in Milton Keynes with limited hybrid working after onboarding, and eligibility for SC/NPPV3 clearances is required.

Qualifications

• Extensive experience with Linux and Windows server administration.
• Strong ability to diagnose and resolve complex IT issues.
• Experience supporting mission-critical applications and security requirements.

Responsibilities

• Research, diagnose, and resolve complex technical and system issues.
• Manage escalated production, integration, and application incidents.
• Install, configure, patch, and upgrade infrastructure and applications.
• Collaborate with stakeholders to address evolving requirements.
• Monitor system health and ensure high availability.

Skills

System administration

Troubleshooting

Stakeholder communication

Tools

VMware

OpenLDAP

IBM MQ

JBoss

Apache Web Server

Tomcat

Job description

What success looks like in this role:

We are seeking an experienced Associate Principal Maintenance & Support Engineer to join a highly secure team. This is a senior, hands‑on Maintenance & Support Engineering position requiring a technically skilled professional who can provide expert support across a complex infrastructure, applications, and data management environment. This role will offer the successful candidate the opportunity to support a diverse range of mission critical applications which are at the core of Justice, Law Enforcement and Border Security agencies within the UK. The successful candidate will play a key role in maintaining service availability, resolving complex technical issues, implementing upgrades and enhancements, and supporting critical systems that underpin operational services.

You MUST be eligible for Security Clearance for this opportunity Due to the secure nature of the project, this role is primarily office-based in Milton Keynes. Limited hybrid working may be considered after a significant onboarding period, subject to business requirements and operational needs.

Key Responsibilities

• Research, diagnose, and resolve complex technical and system issues.
• Investigate and manage escalated production, integration, and application support incidents.
• Perform installation, configuration, maintenance, patching, and upgrades across the infrastructure estate.
• Collaborate with clients, internal stakeholders, and technical teams to understand and address evolving business requirements.
• Monitor system health, network connectivity, alerts, and service interdependencies to ensure optimal performance and availability.
• Maintain and enhance infrastructure, applications, and supporting platforms.
• Produce and maintain comprehensive technical documentation.
• Ensure all work is completed in accordance with industry standards, security requirements, and organisational best practices.
• Participate in an out-of-hours support rota as required.

You will be successful in this role if you have:

• Essential Skills and Experience The successful candidate will possess strong experience across multiple infrastructure and platform technologies, including:

Operating Systems & Infrastructure

• Red Hat Enterprise Linux administration, patching, troubleshooting, and maintenance.
• Windows Server administration, patching, domain management, and support.
• IP networking fundamentals and troubleshooting.
• Virtualisation Technologies VMware vSphere Hypervisor VMware vCenter Server VMware vSphere Replication VMware Site Recovery Manager (SRM) Experience with platform maintenance, upgrades, troubleshooting, and support is essential. Installation experience is advantageous.

Database Technologies

• Oracle Database administration and support.
• Database patching and maintenance SQL scripting RMAN backup and recovery Oracle RAC experience beneficial.

Middleware & Application Support

• OpenLDAP administration, maintenance, and bulk user management.
• IBM MQ administration, support, and upgrades.
• JBoss application server support.
• Apache Web Server administration.
• Apache Tomcat administration and troubleshooting.

Security & Endpoint Management

• Symantec Endpoint Protection / Antivirus administration.
• Security-focused operational support within enterprise environments.

Security Requirements

• Current or eligibility to obtain Security Clearance (SC).
• Current or eligibility to obtain NPPV3 clearance.

Desirable Skills

• Experience with any of the following technologies would be advantageous:
• Microsoft SQL Server PostgreSQL MongoDB Microsoft Azure Zoho Analytics, including:
• Installation and upgrades Maintenance and support Bulk data export and management

Personal Attributes

• Self‑motivated and proactive with a strong sense of ownership.
• Excellent analytical and problem‑solving capabilities.
• Strong communication and stakeholder management skills.
• Ability to manage multiple priorities in a complex technical environment.
• Comfortable working independently and collaboratively within cross‑functional teams.
• Commitment to maintaining high standards of service delivery and customer satisfaction.

Unisys is proud to be an equal opportunity employer that considers all qualified applicants without regard to age, caste, citizenship, color, disability, family medical history, family status, ethnicity, gender, gender expression, gender identity, genetic information, marital status, national origin, parental status, pregnancy, race, religion, sex, sexual orientation, transgender status, veteran status or any other category protected by law. This commitment includes our efforts to provide for all those who seek to express interest in employment the opportunity to participate without barriers. If you are a US job seeker unable to review the job opportunities herein, or cannot otherwise complete your expression of interest, without additional assistance and would like to discuss a request for reasonable accommodation, please contact our Global Recruiting organization at [e-mail] or alternatively Toll Free: 888-560-1782 (Prompt 4). US job seekers can find more information about Unisys’ EEO commitment here.

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Unisys is a global technology solutions company that powers breakthroughs for the world’s leading organizations. Our solutions – cloud, AI, digital workplace, logistics and enterprise computing – help our clients challenge the status quo and unlock their full potential. To learn how we have been helping clients push what’s possible for more than 150 years, visit unisys.com and follow us on LinkedIn. https://www.unisys.com/unisys-legal/recruiting Notice for U.S. Applicants: Unisys is an Equal Opportunity Employer – Minorities/ Females/ Veterans/ Individuals with Disabilities/ Sexual Orientation/ Gender Identity