Mechanical Design Engineer – Siemens Nx

Alten; Harwell; On-site; GBP 45,000 - 60,000; Full time

Benefits offered by this job

Private Medical Insurance

Cycle & Tech Scheme

Employee assistance programme

Life insurance

Pension Scheme

Social gatherings & team events

Flexible way of working

Job summary

ALTEN is seeking an experienced Mechanical Design Engineer to join our engineering team, supporting an exciting programme. You will develop detailed 3D designs and engineering drawings using Siemens NX within a complex environment.

Mid-level role requiring 3+ years in mechanical design, aerospace exposure, and strong NX capability. On-site at Bicester, with a clearable security requirement and a mix of design and collaboration across teams.

Qualifications

• Bachelor’s or Master’s degree in Engineering or equivalent military experience.
• 3+ years’ experience in Mechanical Design or CAD Engineering.
• Experience in Aerospace Industry.
• Proficient with Siemens NX; 3D models and 2D drawings.
• Able to interpret technical specifications and engineering requirements.

Responsibilities

• Develop and modify 3D mechanical designs using Siemens NX.
• Produce accurate 2D engineering drawings for manufacture and assembly.
• Design mechanical components and assemblies meeting engineering requirements.
• Collaborate with engineering, manufacturing and technical teams.
• Review existing designs and implement necessary modifications.
• Ensure designs meet quality, manufacturing and technical standards.
• Support design reviews and resolve issues during development.

Skills

Siemens NX

3D CAD

2D Drawings

Aerospace

Engineering principles

Interpret technical specs

Mechanical design

Education

Bachelor’s or Master’s in Engineering

Equivalent military experience

Job description

Job Description

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

Qualifications

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

Additional Information

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.