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 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.