Senior Mechanical Engineer – Mission Critical Infrastructure

Location: Paris, France

Lead Mechanical Design on Large-Scale Critical Infrastructure Projects

Our client is expanding its engineering team and is looking to appoint an experienced Senior Mechanical Engineer to play a key role in the design and delivery of complex mission-critical facilities across France.

This is an excellent opportunity for an experienced building services or mechanical engineer with expertise in HVAC systems and critical environments who enjoys taking ownership of technical delivery from concept through to commissioning.

Working as part of an international engineering organisation, you'll collaborate with multidisciplinary teams to develop robust, energy-efficient mechanical solutions for technically demanding infrastructure projects.

The Opportunity

This role offers the chance to lead the mechanical engineering function across multiple projects, ensuring designs are technically sound, compliant with local regulations and aligned with client requirements.

You'll work closely with architects, structural engineers, electrical specialists, project managers and external consultants, providing technical leadership while helping coordinate engineering activities throughout the project lifecycle.

Success in this position will come from your ability to combine technical excellence with practical problem-solving, stakeholder management and a collaborative approach to project delivery.

Key Responsibilities

Mechanical Engineering Leadership

• Lead the design and coordination of mechanical building services across complex infrastructure developments.

• Develop, review and refine HVAC designs to ensure performance, efficiency and compliance with project objectives.

• Provide technical leadership throughout design development, procurement, construction support and commissioning.

• Ensure engineering documentation remains accurate and aligned with project requirements.

Design Coordination

• Work collaboratively with multidisciplinary engineering teams to integrate mechanical systems into wider building designs.

• Coordinate with consultants, contractors and specialist suppliers throughout project delivery.

• Review engineering submissions, technical calculations and equipment selections to ensure quality and consistency.

• Resolve design challenges through practical engineering solutions that support programme delivery.

Technical Assurance

• Evaluate mechanical system performance with a focus on reliability, resilience and operational efficiency.

• Support design reviews, technical workshops and engineering approvals.

• Identify engineering risks early and work with project teams to implement effective mitigation strategies.

• Promote engineering best practice and continuous improvement across project teams.

Project Support

• Provide engineering input during construction, testing and commissioning phases.

• Assist with technical queries, design changes and site coordination activities.

• Support project teams in delivering successful client outcomes while maintaining technical quality standards.

• Contribute to lessons learned and future design improvements across the wider engineering function.

About You

We're looking for an experienced mechanical engineer with a strong background in complex building services or mission-critical infrastructure.

You are likely to have:

• A degree in Mechanical Engineering, Building Services Engineering or a related discipline.

• Significant experience delivering mechanical or HVAC engineering projects.

• Strong understanding of chilled water, cooling systems and mechanical plant design.

• Experience working on technically demanding facilities such as data centres, industrial plants, healthcare, laboratories or other critical environments.

• Excellent communication and stakeholder management skills.

• The ability to work effectively across multidisciplinary engineering teams.

Experience That Would Be Highly Beneficial

Candidates with experience in one or more of the following areas would be particularly well suited to this opportunity:

• Mission-critical facilities

• Data centre mechanical design

• Energy-efficient cooling solutions

• Thermal management

• Building Management Systems (BMS)

• Commissioning and integrated system testing

• Computational Fluid Dynamics (CFD)

• BIM coordination and digital engineering

• Mechanical plant optimisation

• Sustainable building services design

Experience using industry-standard engineering and BIM software would also be advantageous.

Language Requirements

• Professional fluency in French and English is essential.

• Comfortable working with both local project stakeholders and international engineering teams.

Why Consider This Opportunity?

This is an exciting opportunity to join a growing engineering organisation delivering technically advanced infrastructure projects across France.

You'll work on high-profile developments, collaborate with experienced multidisciplinary teams and have the opportunity to influence mechanical design from the earliest project stages through to successful completion.

If you're looking for a role that combines technical leadership, engineering excellence and genuine project ownership, this could be an excellent next step in your career.