Senior/Principal Mechanical Engineer

Black & White Engineering; Greater London; On-site; GBP 65,000 - 95,000; Full time

Job summary

Black & White Engineering is seeking a Senior/Principal Mechanical Engineer to guide the design and delivery of advanced building services and critical infrastructure projects across the UK.

You will lead mechanical design packages, deliver robust engineering solutions, and mentor engineers while collaborating with multidisciplinary teams to ensure high quality outcomes and client satisfaction.

Qualifications

• Strong experience delivering mechanical building services engineering designs.
• Proven understanding of cooling, HVAC and associated mechanical systems.
• Experience leading design packages and managing technical deliverables.
• Strong coordination and communication skills within multidisciplinary project environments.
• Ability to review engineering work and solve complex technical challenges.
• Experience supporting clients, stakeholders and developing junior engineers.

Responsibilities

• Deliver mechanical engineering designs for complex projects, including HVAC, cooling and associated building services systems.
• Lead the development of technical solutions and undertake engineering calculations and system design activities.
• Coordinate with internal disciplines and external stakeholders to ensure effective project delivery.
• Review design outputs and provide technical guidance to maintain quality and consistency.
• Support client interactions and contribute to technical discussions throughout project lifecycles.
• Mentor less experienced engineers and share technical knowledge across teams.
• Identify opportunities for continuous improvement, innovation and enhanced engineering performance.

Skills

Mechanical building services

HVAC systems

Design package leadership

Coordination

Technical problem-solving

Client interaction

Mentoring

Job description

Are you an experienced mechanical engineer who enjoys solving complex technical challenges while helping shape the performance of high-profile engineering projects?

We are looking for a Senior/Principal Mechanical Engineer to play a key role in the design and delivery of advanced building services and critical infrastructure projects. Whether you are operating at Senior level and ready for greater responsibility, or already working as a Principal Engineer, this role offers the opportunity to lead significant design packages, contribute technical expertise and work alongside multidisciplinary teams delivering world-class engineering solutions.

You will be trusted to take ownership of key aspects of project delivery while helping to maintain engineering quality, supporting colleagues and contributing to innovative, practical and efficient design solutions.

What's in It For You

• Meaningful Project Ownership - Take responsibility for significant mechanical design packages, influencing project outcomes and delivering solutions that perform throughout their operational life.
• Complex Technical Challenges - Work on sophisticated cooling, HVAC and critical infrastructure systems where engineering expertise and problem-solving skills make a measurable difference.
• Multidisciplinary Collaboration - Engage with electrical, structural, sustainability and wider specialist teams to deliver coordinated and integrated engineering solutions.
• Professional Development - Build your technical profile through exposure to complex projects, increasing responsibility and opportunities to develop leadership capability.
• Technical Influence - Share your expertise through design reviews, mentoring and the development of engineering best practice across project teams.
• Supportive Culture - Join a collaborative environment where accountability, integrity, simplicity and supportiveness underpin the way teams work together and deliver for clients.

What You'll Be Doing

• Deliver mechanical engineering designs for complex projects, including HVAC, cooling and associated building services systems.
• Lead the development of technical solutions and undertake engineering calculations and system design activities.
• Coordinate with internal disciplines and external stakeholders to ensure effective project delivery.
• Review design outputs and provide technical guidance to maintain quality and consistency.
• Support client interactions and contribute to technical discussions throughout project lifecycles.
• Mentor less experienced engineers and share technical knowledge across teams.
• Identify opportunities for continuous improvement, innovation and enhanced engineering performance.

Essential Skills

• Strong experience delivering mechanical building services engineering designs.
• Proven understanding of cooling, HVAC and associated mechanical systems.
• Experience leading design packages and managing technical deliverables.
• Strong coordination and communication skills within multidisciplinary project environments.
• Ability to review engineering work and solve complex technical challenges.
• Experience supporting clients, stakeholders and developing junior engineers.

Learning & Development

You will be joining a community that focuses on learning and development through regular lunch and learn sessions and investment in accredited professional courses or educational programmes. You can set the pace for your professional development, and whatever path you choose, you will receive relevant support.

Company Overview

Black & White Engineering is a multi-award-winning engineering consultancy with offices across the UK, Europe, the Middle East and Asia Pacific.

We are a leading provider of engineering design services for the data centre sector, delivering expertise across Mechanical, Electrical and Plumbing (MEP), Civil and Structural, Power Systems, Sustainability, BIM, Design Management and wider specialist infrastructure disciplines.

Our teams support projects across all areas of the construction industry, offering practical, efficient design solutions that prioritise real-world installation, maintenance and operational performance.

As one of the fastest-growing consultancies in our industry, we offer genuine opportunities for progression. Many of our engineers have developed into leadership roles as the business has expanded. Joining Black & White Engineering means making a meaningful impact with clients and colleagues while receiving the recognition you deserve.