Senior Mechanical Engineer

What Exergy3 does: 

Exergy3 is a dynamic and forward-thinking company committed to delivering cost effective decarbonisation of industrial processes through exceptional high-temperature thermal energy storage solutions.

We’re at a pivotal stage in our evolution, delivering our first pilot projects, growing our team, and commercialising our technology. 

What we want to achieve: 

 Our vision can be summarised in one sentence: Reliable, quick and affordable decarbonisation for every process. 

More than 50% of global CO2 emissions are caused by processes that so far have proven difficult, time-consuming and expensive to decarbonise. Our radical solution is more cost effective, faster and easier to implement than the alternatives. 

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 . 

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.