Senior Mechanical Engineer - Mission Critical

At HDR, our employee-owners are fully engaged in creating a welcoming environment where each of us is valued and respected, a place where everyone is empowered to bring their authentic selves and novel ideas to work every day. As we work to weave diversity, equity, and inclusion into our work and foster a sense of belonging throughout the company and within our communities, we constantly ask ourselves: What is our impact on the world?

As a Senior Mechanical Engineer you will have the opportunity to collaborate with various engineering teams to create detailed designs, plans, specifications and installation designs of complete mechanical systems and HVAC solutions for Data Centres. You will be part of an organisation that is 100-percent employee owned, that supports and creates many opportunities for you to advance, succeed and fulfil your career aspirations.

We are looking for someone who has a keen eye for detail and conversant with all aspects of mechanical engineering. Whilst you will be a competent & experienced designer, we are looking for a self-starter that can manage and develop resources to meet project demands whilst maintaining the highest level of technical excellence and regulatory compliance and work as part of the wider multi-disciplinary engineering team.

In the role of Senior Mechanical Engineer, we will count on you to:

• Carry out engineering concept design through to detailed design.
• Ensure all design projects and reports within the group are technically compliant, to a consistent quality and standard. Maintain regular in-house design reviews and checks.
• Motivate yourself and manage staff within group to build coherent high performing teams. Set objectives, monitor performance, coach and develop staff to optimise their potential.
• Implement and manage QA systems and procedures on all projects.
• Implement Company Health and Safety. Ensure all designs respond to the CDM regulations.
• Ensure Quality Management System ISO 9001 and 14001 are adhered to.

Required Qualifications:

• Bachelor’s degree in Mechanical Engineering, Building Services or relevant subject
• Minimum 5 yrs mechanical design experience within design consultancy
• Mechanical design experience for data centres
• Experience Managing Mechanical Design throughout all design stages
• Wide experience of critical mechanical systems, HVAC engineering and multiple levels of resilience including cooling, ventilation, humidification, fuel oil and flue systems.
• Strong knowledge of Microsoft Office, MS Project and AutoCAD
• Demonstrated leadership skills, previous team coordination and project management experience
• Previous experience with an architectural / engineering or engineering consulting firm
• An attitude and commitment to being an active participant of our employee-owned culture is a must

HDR is our company. Together, we build on each other's life experiences and perspectives to make great things possible every day. This shapes our collaborative culture, encourages organizational trust and connects us closer to the clients and communities we serve.

As employee owners, we all have a role in creating an inclusive environment where each of us is welcomed, valued, respected and empowered to bring our authentic selves to work every day.

Our eight Employee Network Groups (Asian Pacific, Black, Hispanic / Latino(a), LGBTQ+, People with Disabilities, Veterans, Women, Young Professionals) help create a sense of belonging and foster a supportive environment where everyone is empowered to engage and contribute. Each group has an executive sponsor and is open to all employees.

Primary Location: United Kingdom-England-London

Industry: Building Engineering

Schedule: Full-time

Employee Status: Regular

Job Posting: Nov 14, 2025