Maintenance Engineer – Mechanical

OCS; Oxford; On-site; GBP 32,000 - 48,000; Full time

Benefits offered by this job

Award-Winning employer

Digital learning

Retail perks via Hapi app

Professional growth

Flexible pay

Job summary

OCS UK & Ireland is seeking a site-based maintenance engineer to deliver PPM and reactive maintenance across client buildings. You will inspect, maintain, diagnose faults, and repair mechanical systems ensuring safe, compliant operation and strong customer service.

Working hours 08:00–16:30, you will use CAFM/helpdesk and BMS tools to record work, supervise subcontractors, and support continuous improvement while upholding health, safety, and quality standards.

Qualifications

• Qualified mechanical engineer with relevant certifications and hands-on maintenance experience.
• Experience maintaining HVAC, heating, ventilation, air conditioning, and refrigeration systems.
• Knowledge of safety processes including Permit to Work and site safety compliance.

Responsibilities

• Monitor and manage critical building services operation and performance.
• Undertake planned maintenance (PPM) and reactive repairs on mechanical systems.
• Diagnose faults and rectify to maintain operational continuity.
• Maintain maintenance records and use CAFM/helpdesk systems.
• Ensure statutory, health & safety, and QA documentation is up to date.
• Supervise subcontractors on site and monitor safety procedures.
• Work within Permit to Work and QHSE guidelines.
• Assist in quality inspections and continuous improvement.
• Monitor building conditions via BMS to optimise comfort.
• Develop client relationships and maintain professional image.

Skills

HVAC maintenance

Fault diagnosis

Maintenance planning

Customer-focused service

Education

Level 3 NVQ Diploma in Mechanical Engineering Maintenance (or equivalent).

City & Guilds Mechanical Engineering qualification (Level 2 or Level 3).

Completed Mechanical Engineering Apprenticeship.

Tools

CAFM/Helpdesk systems

BMS systems

Job description

Role Overview

To operate as part of a site-based team of maintenance engineers, delivering planned preventative maintenance (PPM) and reactive maintenance activities across a portfolio of client buildings. The role includes the inspection, maintenance, fault diagnosis, and repair of building services systems, ensuring all assets operate safely, efficiently, and in compliance with statutory and contractual requirements while maintaining high standards of customer service and operational performance.

About The Role

Working Hours 08:00am-16:30pm

Key Tasks & Responsibilities

• Monitor and manage the operation and performance of critical building services systems.
• Undertake planned preventative maintenance (PPM) and reactive repairs on mechanical systems
• Diagnose and rectify plant faults promptly to maintain operational continuity
• Maintain accurate maintenance records and update the client's CAFM/helpdesk system using mobile technology
• Ensure statutory compliance records, health & safety documentation, and quality assurance records are kept current and accurate
• Supervise, escort, and monitor specialist subcontractors working on site
• Operate safely within the Permit to Work system and comply with all QHSE procedures
• Support quality inspections, housekeeping standards, and continuous improvement activities
• Monitor building environmental conditions via the BMS and optimise building performance and occupant comfort
• Develop strong client relationships, maintain a professional image, and promote a safe and healthy working environment

Qualifications, Skills & Experience

• Level 3 NVQ Diploma in Mechanical Engineering Maintenance (or equivalent).
• City & Guilds Mechanical Engineering qualification (Level 2 or Level 3).
• Completed Mechanical Engineering Apprenticeship.
• Health & Safety awareness, including Permit to Work systems.
• Experience working on HVAC, heating, ventilation, air conditioning, and refrigeration systems

About You

• An appropriate mechanical engineering qualification, supported by demonstrable experience in the maintenance and operation of building services within critical and laboratory environments, is essential for this role.
• Knowledge of the facilities management sector is desirable, with a thorough understanding of building services engineering and the maintenance of mechanical systems considered essential
• Technical expertise covering mechanical ventilation, heating & cooling systems, including associated plant, controls, and distribution pipework
• Knowledge or awareness of BMS and electrical systems
• Knowledge of key operational procedures e.g. planned maintenance systems (CAFM) / QHSE.
• Experience of managing and resolving customer concerns within a contract-based environment, with a proactive and customer-focused approach to problem solving and service improvement

About The Company

OCS UK & Ireland is a leading facilities management company with 50,000+ colleagues and a turnover in excess of £2bn. We deliver innovative, award-winning services within facilities management, hard services, cleaning, security and catering.

Our mission is to make people and places the best they can be for our colleagues, customers and the communities we serve. Our commitment to doing business the right way is rooted in our TRUE values - Trust, Respect, Unity, and Empowerment.

Why Work for OCS?

• Award-Winning Employer: Ranked 36th on Glassdoor’s Best Companies to Work For 2025 — we value and motivate our people.
• Digital Learning: The OCS Academy offers digital courses and resources to help you build skills and grow your career.
• Retail Perks With our Hapi app, you can gain access to exclusive discounts, rewards and wellbeing resources.
• Professional Growth: 600+ live learners across UK&I — Empowering colleagues with further development and qualifications!
• Flexible Pay: Access a portion of earned wages before payday with our Wagestream App! (Contract Specific)

We are an equal opportunities employer and rely on a diverse workforce with a broad range of knowledge, skills, and backgrounds to deliver our goals. We offer an inclusive and welcoming environment and actively encourage applications from all individuals regardless of race, gender, nationality, religion, sexual orientation, disability, or age.

#CEJ26