Senior Mechanical Engineer

• Job Title: Senior Mechanical Engineer
• Location: Edinburgh (Onsite 3-4 days/week with flexible hybrid options)
• Department: Engineering
• Reports To: Chief Operating Officer
• Position Type: Full-time
• Compensation: £35-£45k p/a plus EMI Options

About Exergy3:

Exergy3 is a pioneering company specialising in ultra-high temperature thermal energy storage technology, with a mission to drive the decarbonisation of heat across Europe and beyond. As a spin-out from the University of Edinburgh, we are at the forefront of clean heat innovation, providing scalable, efficient, and cost-effective decarbonisation solutions for industrial processes and large-scale building heating.

Job Overview:

We are looking for an exceptional Senior Mechanical Engineer to join our growing, agile team in Edinburgh. You will play a critical role in the design, development, and implementation of cutting-edge thermal energy storage systems that spans mechanical, fluid, and electrical domains. This is a multidisciplinary, hands-on role that combines high-level design leadership with practical engineering delivery.

The ideal candidate will thrive in a dynamic, fast-growing environment, possess excellent problem-solving skills, and show initiative in scaling design and documentation processes as we move from prototyping to production and deployment.

Qualifications & Experience:

• Bachelor’s or Master’s degree in Mechanical Engineering or a related discipline.
• Minimum 4-7 years of experience in mechanical engineering, including experience in a senior or lead capacity.
• Demonstrated ability to manage projects from concept through to installation and commissioning.
• Strong track record of cross-disciplinary collaboration (electrical, mechanical design, manufacturing).
• Excellent verbal and written communication skills for technical documentation, supplier liaison, and internal leadership.

Key Responsibilities:

As a Senior Mechanical Engineer, you will work closely with the Chief Operating Officer, the wider engineering team, technicians, subcontractors, and health and safety consultants to deliver robust, high-performing systems.

Mechanical Design & Engineering

• Detailed mechanical engineering design integrating mechanical, fluid, and electrical components, including tolerance management methods.
• CAD and drawing management: reviewing, organising, issuing, and maintaining up-to-date design documentation.
• Creation and maintenance of bills of materials.
• Experience in system-level engineering, especially within thermofluidic and electrical systems.
• Strong practical engineering skills, including rapid prototyping, modifications, and workshop support.
• Development of instruction manuals and assembly guides.
• Creation and implementation of design registers and other structured design documentation tools.
• Cost-reduction engineering: evaluating materials, manufacturing methods, and assembly processes.
• Development and execution of system test schedules.

Project & Change Management

• Leadership in distributing, tracking, and delivering engineering work packages to meet deadlines.
• Oversight of change management processes to improve practices as the business scales.
• Coordination with subcontractors to ensure proper and timely documentation and delivery.
• Creation of risk assessments and method statements (RAMS) from an engineering perspective.
• Leading and documenting testing activities of workshop-built prototypes.

Workshop & Installation Support

• Technical management of workshop operations: issuing drawings, assigning work packages, tracking progress.
• Supervision of technicians during build and assembly phases.
• Hands-on support to workshop teams for tooling, fabrication, and assembly guidance.
• Real-time technical support for field teams during site installations.
• Willingness to travel to deployment sites and oversee on-site installations.

Supplier, Procurement & Supply Chain

• Management of existing and new suppliers to ensure specification compliance and delivery.
• Procurement of components and systems: from specification through purchase and delivery.
• Support for supply chain resilience: alternative material and vendor identification.
• Develop clear and rigorous specifications, ensuring that supplier deliverables align with defined technical and quality requirements.

Desirable Additional Skills

• Electro-mechanical integration and specification of electrical components.
• Control system hardware and software adaptation experience.
• Ability to inherit and modify control software for new applications.
• Thermofluidic modelling, including CFD and FEA literacy.
• Strong first-principles-based modelling of thermal systems.
• Manufacturing engineering experience with design–manufacture interaction.
• Development of new technologies with potential for intellectual property protection.
• Sensor integration experience (e.g., pressure, temperature).
• Design risk registers for installation and operational phases.
• Experience with high-temperature systems.
• Company-wide organisation system development (e.g. SharePoint, document registers).
• Familiarity with engineering design processes required for achieving formal product certifications, including documentation, testing, and compliance audits.

Why Join Exergy3?

• Be part of a dynamic and innovative company at the forefront of clean energy technology.
• Play a pivotal role in driving the growth and success of Exergy3.
• Competitive salary and performance-based incentives.
• Opportunities for professional growth and development.
• Contribute to a sustainable future by promoting clean heat solutions.
• Opportunity to shape the design processes, documentation standards, and engineering practices at a critical growth stage.
• Be a key contributor in turning emerging technologies into commercially viable products.
• Work at the intersection of academic innovation and industrial impact, helping scale clean heat solutions across Europe.

What we offer:

• A supportive, inclusive team culture. We value diverse perspectives and encourage collaboration.
• £35k – £45k per annum depending on experience, and EMI options after 6 months.
• 34 days annual leave (25 flexible + 9 fixed annual leave days which can either be the Scottish Bank Holidays or aligned to the school term breaks in your council area of residence.)
• Hybrid working
• Compressed Hours (35 hr/week)

Application Process:

Interested candidates should submit their resume and a cover letter outlining their qualifications and vision for the role to recruitment@exergy3.com .

Exergy3 is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.

Timelines:

We hope to fill this position as soon as possible.