Mechanical Design Engineer – Siemens NX

ALTEN is a global engineering and technology consultancy operating across over 35 countries worldwide. We partner with industry leaders across sectors including Aeronautics, Aerospace, Defence, Naval, Automotive, Energy, Rail, IT and many more to deliver innovative engineering solutions that drive technological advancement & support sustainable transformation.

Our teams of passionate and agile engineers work on cutting-edge projects that shape the future of technology and sustainability. At ALTEN, we empower talented engineers to innovate, solve complex challenges, and deliver impactful solutions that build tomorrow’s world—today.

Join us and start building tomorrow’s world today!

ALTEN is looking for an experienced Mechanical Design Engineer to join our engineering team, supporting an exciting and technically challenging engineering programme.

This opportunity would suit a Mechanical Design Engineer with strong Siemens NX experience who is confident developing detailed 3D designs and engineering drawings within a complex engineering environment.

Location: Bicester

On Site: Onsite

Clearance: Clearable

Experience Level: Mid Level

Key Responsibilities:

Develop and modify 3D mechanical designs using Siemens NX

Produce accurate 2D engineering drawings to support manufacture and assembly

Design mechanical components and assemblies in line with engineering requirements

Work closely with engineering, manufacturing and technical teams throughout the design lifecycle

Review existing designs and implement engineering modifications where required

Ensure designs meet relevant quality, manufacturing and technical standards

Support design reviews and resolve technical issues during development

Required Skills:

3+ years’ experience within Mechanical Design, CAD Engineering or a similar role

Experience within the Aerospace Industry

Strong hands-on experience with Siemens NX – mandatory

Experience creating detailed 3D models and 2D manufacturing drawings

Good understanding of mechanical engineering and design principles

Experience working with mechanical components and assemblies

Ability to interpret technical specifications and engineering requirements

Required Qualifications:

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

Desirable Skills:

Experience within a highly regulated or complex engineering environment

Knowledge of GD&T and engineering tolerancing

Understanding of manufacturing processes and design for manufacture

Experience supporting designs from concept through to production

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.