Mechanical Development Engineer

About Us

INEOS Electrochemical Solutions (IES) is a global technology business specialising in the development and delivery of advanced electrochemical technologies. Building on our strong foundation in chlor-alkali, we are rapidly expanding in hydrogen and other technologies supporting the energy transition to net zero.

Over the past decade, IES has experienced exceptional growth through innovation, technical excellence and collaboration. Today, we continue to expand globally, helping customers deliver electrochemistry-based solutions in increasingly sustainability-focused markets. A key part of this growth is our integrated process engineering capability, supporting the design, optimisation and safe delivery of electrochemical plants.

At INEOS, we know that diverse perspectives and experiences strengthen our teams and improve the way we innovate and solve problems. We are committed to creating an inclusive workplace where everyone has the opportunity to contribute, develop and thrive. We encourage applications from people of all backgrounds, identities and experiences, including those who may not meet every listed requirement but believe they can bring value to the role.

Mechanical Development Engineer

The Role

Join a highly specialised engineering team developing advanced electrolyser technology for global markets. You’ll play a key role in improving product performance, reliability, and manufacturing capability while ensuring full compliance with SHE and engineering standards.

What You’ll Do

• Lead mechanical design and manufacturing process development for electrolyser technologies


• Support delivery of major projects, including BiChlor & Alkali Water Electrolysis (AWE) and wider capital programmes


• Drive continuous improvement to enhance quality, reduce costs, and increase capacity


• Provide engineering support to in-house manufacturing, pilot plants, and global supply chain partners


• Contribute to capital projects involving plant expansion, refurbishment, and process optimisation


• Support development and implementation of manufacturing processes including tooling, automation, and plant capability upgrades


• Work closely with suppliers to improve quality, performance, and production capability (Take technical ownership of supplier performance, driving quality, delivery, and cost improvements across a global supply chain)


• Identify and implement cost reduction and value engineering opportunities


• Carry out design analysis, risk assessments, and testing programmes


• Support the refurbishment and development of new and existing technologies


• Contribute to customer projects, ensuring technical accuracy and successful delivery

What We’re Looking For

• Degree in Mechanical Engineering


• Proven experience in a similar role 


• Strong experience in manufacturing, fabrication, and precision engineering environments

• Knowledge of regulatory frameworks such as PED/PSSR, PUWER, LOLER, Machinery Directive


• Experience working with quality system (e.g. ISO 9001)


• Commercial awareness to support EBITDA growth

• Proven problem-solving skills (e.g. FMEA, root cause analysis)


• Ability to work effectively across teams and with external partners


• Self-motivated with the tenacity to see tasks and projects to completion

What We Offer

We support our employees and give them opportunities to develop both professionally and personally. Benefits include:

• Generous holiday scheme plus holiday bonus 


• Discretionary bonus scheme


• Competitive pension scheme including employer contributions


• Enhanced maternity pay


• Free on-site gym


• Generous Life assurance


• Access to Healthcare scheme

Recruitment Process

Initial Conversation

Shortlisted candidates may be invited to an MS Teams or telephone discussion to learn more about the role and share their experience.

Interview Stage

Successful candidates will be invited to an in-person interview including functional and behavioural discussions. Depending on the role, the process may also include technical assessments or presentations.

Offer Stage

Preferred candidates will receive a conditional offer subject to references, medical assessment and, where applicable, background checks.

Provisional Offer
If you are selected as the preferred candidate you will receive a provisional offer which will be subject to a medical assessment and reference checks. Some roles may also require a criminality check.