We are looking for a Principal Mechanical Design Engineer to join Coolbrook’s Engineering team.

Coolbrook is a transformational technology and engineering company on a mission to decarbonize major industrial sectors like petrochemicals and chemicals, iron and steel, and cement. We bring together world class expertise across different fields, building a strong, impactful, and passionate organization to scale up our technology for decarbonisation. Our international and growing team is working in Finland, the UK and the Netherlands. We are leading a Clean New Industrial Era.

As Principal Mechanical Design Engineer, you will be instrumental in delivering the mechanical design of our groundbreaking machines.

Coolbrook offers you an exciting role in an international and dynamic growth company with a real opportunity to have an impact and make history. In this permanent role you will be based in City, Country and report to Mark Wilson, Head of Engineering and Manufacturing, while collaborating with multiple internal and external stakeholders.

As Principal Mechanical Design Engineer, your responsibilities would include

• Lead the mechanical design of complex turbomachinery components and sub-systems, from requirements definition through to release.
• Create and release product definition in Siemens NX, with full lifecycle control in Teamcenter PLM.
• Perform and oversee design optimisation using 1D hand calculations, 2D analyses, and 3D finite element simulations (structural, thermal, modal, fatigue).
• Checking and approval of mechanical deliverables generated by other engineers to ensure compliance and quality.
• Work with other specialists to define the mechanical sub-system requirements, including the best suitable machine architecture and achieving mechanical robustness through design.
• Perform and oversee design optimization assessments by applying 1D hand calculation, 2D and 3D Finite Element Analyses
• Contribute and steer the development of Mechanical Design methods and tools.
• Write and present project status updates to stakeholders as needed.
• Providing technical guidance through effective coaching/mentoring of Team Members when required
• Ensure all applicable codes and standards such as BS, ASME, API, ISO, etc. are satisfied
• Work cross functionally with stakeholders to ensure the Coolbrook product offering is optimized for Mechanical Design

For success in this role, you will need

• Minimum 7 years’ experience in mechanical design engineering, with a strong background in turbomachinery and/or high-temperature static structures (e.g. casings, combustors, ducts, frames)
• Deep knowledge of material properties and manufacturing processes for high-temperature alloys (nickel-based, stainless steels, etc.).
• Experience applying thermo-mechanical analysis and design methods to both rotating and static components, including life assessment (creep, fatigue, LCF/HCF).
• Proven ability to apply analytical approaches and first-principles methods, with strong data interpretation skills and a solution-oriented mindset.
• Proficiency in Siemens NX and lifecycle management in Teamcenter PLM.
• Demonstrated capability in engineering product definition, from 2D drawings through to model-based definition.
• Strong written and verbal communication skills, with the ability to produce clear technical reports and presentations.
• Effective collaborator in multi-disciplinary teams, but equally capable of working independently with minimal supervision.

• Minimum of a bachelor’s degree in mechanical or aerospace engineering (preferably a higher degree).
• Professionally registered with a relevant engineering institution, preferably at or working towards Chartered Engineer status.
• Experience working in a fast-paced technology development engineering environment would be highly advantageous
• Experience working in R&D or SME roles where engineering process and procedures are yet to be defined and one must refer to first principles regularly would be highly advantageous
• Experience of Python or other similar coding languages, and their application in the streamlining/automation of simple and/or repetitive tasks would be highly advantageous

At Coolbrook we are passionate about building teams where unique perspectives and backgrounds are valued and where everyone feels equally included.

If this resonates with you, we are looking forward to receiving your application.

Please apply by 05.12.2025, and please note that we review applications as they come in, as we are looking to fill the position soon.

With inquiries about the role, please reach out to Mark Wilson (mark.wilson@coolbrook.com).


About Coolbrook:

Named Tech Champion 2022 in the Manufacturing category by The Financial Times and 2025 BNEF Pioneer by the Bloomberg New Energy Finance, Coolbrook is a transformational technology and engineering company on a mission to decarbonise major industrial sectors like petrochemicals and chemicals, iron and steel, and cement. Coolbrook’s revolutionary rotating technology combines space science, turbomachinery and chemical engineering to replace burning of fossil fuels across all major industrial sectors.

The technology has two main applications: RotoDynamic Reactor^TM (RDR^TM) to reach 100% CO₂ free olefin production, and RotoDynamic Heater^TM (RDH^TM) to provide carbon-free process heating to iron and steel, cement and chemicals production. Once implemented at scale, the RotoDynamic Technology has the potential to reach temperatures of 1700°C and cut 2.4 billion tons (30%) of annual CO₂ emissions in heavy industry. For more information, please visit www.coolbrook.com.