Senior Mechanical Engineer

HDR; Croydon; On-site; GBP 65,000 - 90,000; Full time

Job summary

HDR is hiring a Senior Mechanical Engineer to collaborate with multi-disciplinary teams to design mechanical systems and HVAC solutions for Data Centres, ensuring technical excellence and regulatory compliance.

As an employee-owned firm, HDR empowers you to lead projects, grow your skills, and deliver world‑class facilities from offices across the United Kingdom. You will mentor junior engineers, manage resources, and contribute to safety and quality programs.

Qualifications

• Bachelor's degree in Mechanical Engineering, Building Services or relevant subject.
• Minimum 5 years mechanical design experience within design consultancy.
• Mechanical design experience for data centres.
• Experience managing mechanical design through all design stages.
• Experience with HVAC, cooling, ventilation and related systems; strong technical leadership.

Responsibilities

• Carry out concept design through to detailed design.
• Ensure projects meet quality standards and regulatory compliance.
• Motivate and manage staff to build high performing teams.
• Implement and manage QA systems on projects.
• Implement CDM regulations and health and safety policies.
• Ensure ISO 9001 and 14001 are adhered to.

Skills

Mechanical design

Data centre systems

Leadership

Project management

AutoCAD

MS Project

Regulatory compliance

Quality systems

Microsoft Office

Detail-oriented

Education

Bachelor's degree in Mechanical Engineering or related field

Tools

AutoCAD

MS Project

Microsoft Office

Job description

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?

Watch Our Story: 'https://www.hdrinc.com/our-story'

Each and every role throughout our organization makes a difference in our ability to change the world for the better. Read further to learn how you could help make great things possible not only in your community, but around the world.

About The Role

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

About You

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 resource 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'll 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 5yrs 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 multiples 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

What We Believe

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.

Our Commitment

As employee owners, we all have a role in creating an inclusive environment where each of we are 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 Other Locations: United Kingdom-England-Croydon, United Kingdom-Scotland-Glasgow, United Kingdom-England-Manchester Industry: Building Engineering Schedule: Full-time Employee Status: Regular BusinessClass: Building Mechanical Job Posting: Jan 12, 2026

At HDR, we are committed to the principles of employment equity. We are an Aff…