Senior Mechanical Design Engineer - Aerospace

We are seeking an experienced Senior Design Engineer to support the development of complex engineering products within a highly regulated environment. This role offers the opportunity to take ownership of component and system-level design activities, from initial concept generation through to detailed design and product definition.

Working within a multidisciplinary engineering team, you will be responsible for delivering robust design solutions, producing high-quality CAD models, and ensuring designs meet performance, manufacturing, and compliance requirements.

Key Responsibilities:

• Develop engineering concepts and mature designs through the full product lifecycle.
• Produce detailed component and assembly designs using Siemens NX.
• Generate and manage 3D models, technical drawings, and product definition data.
• Translate system-level requirements into practical engineering solutions.
• Perform GD&T application and tolerance stack-up analysis to ensure manufacturability and fit-for-purpose designs.
• Support design reviews, verification activities, and technical decision-making.
• Work closely with manufacturing, systems, and project teams to ensure successful product delivery.
• Ensure all design outputs comply with relevant standards, processes, and configuration control requirements.

Required Skills:

• Proven experience as a Design Engineer, Mechanical Design Engineer, or Senior Design Engineer.
• Strong background in component design, from concept through to detailed design.
• Experience working with system-level requirements and requirement-driven engineering.
• Advanced proficiency in Siemens NX.

Strong understanding of:

• 3D CAD modelling
• Product definition and technical drawing creation

Required Qualifications:

• A Bachelor’s or Master’s degree in Engineering, or equivalent military experience.

Desirable Skills:

• Experience in defence, aerospace, nuclear, rail, automotive, or other regulated industries.
• Knowledge of PLM and configuration management processes.
• Familiarity with verification, validation, and design assurance activities.

Why join us? 

We bring together entrepreneurial, tech-driven people to deliver innovative solutions for leading companies.

At ALTEN, you’ll work on exciting projects, supported by ongoing learning, mentoring, and clear career development tailored to your goals.

Join a passionate team and help build tomorrow, today.

In short you get: 

• A personalised career path and a rewarding management style 
• A huge diversity of engineering projects and industries
• Private Medical Insurance
• Cycle & Tech Scheme 
• Employee assistance programme
• Life insurance & Pension Scheme
• Social atmosphere, regular gatherings & team buildings
• Flexible way of working (role dependent)

We are proud to support the Armed Forces Covenant & actively encourage applications from members of the Armed Forces community, including veterans, reservists, service leavers, and military spouses/partners. We recognise the value of military skills and experience and are committed to ensuring that no applicant is unfairly disadvantaged during our recruitment and selection processes. 

ALTEN is committed to fostering a diverse and inclusive workplace and values the strength that comes from a global mix of backgrounds and perspectives. We welcome applications from all suitably qualified candidates, regardless of background or protected characteristics under the Equality Act 2010. If you require any reasonable adjustments during the recruitment process, please let us know. 

This role may require you to have or be willing to go through Security Clearance. As part of the onboarding process candidates will be asked to complete a Baseline Personnel Security Standard; details of the evidence required to apply may be found on the government website Gov.UK. If you are unable to meet this and any associated criteria, then your employment may be delayed, or rejected . Details of this will be discussed with you at interview.