Mechanical Design Engineer

We're looking for a Mechanical Design Engineer to support the development of complex defence and security systems within a highly regulated engineering environment. You will be responsible for delivering detailed mechanical designs, producing compliant engineering documentation, and collaborating with multidisciplinary teams to develop robust products from concept through to manufacture. This is an opportunity to contribute to mission-critical programmes while taking ownership of technical work packages and design activities.

Location: Belfast
On-site Requirement: 2-3 Days Per Week
Seniority: 5+ Years Experience
Security Clearance: Candidates must be willing and eligible to obtain SC clearance.

Key Responsibilities

• Leverage engineering fundamentals to solve complex technical challenges and support key design decisions.
• Produce detailed mechanical designs using a range of CAD and CAE tools.
• Maintain product documentation in accordance with established engineering processes and procedures.
• Collaborate with multidisciplinary stakeholders to ensure robust, manufacturable, and compliant product designs.
• Perform engineering change activities while maintaining BOM integrity and configuration control.
• Produce engineering drawings in accordance with BS 8888 standards.
• Lead and participate in formal design reviews.
• Undertake and deliver mechanical work packages throughout the product lifecycle.

Required Skills

• Demonstrable experience in mechanical design engineering within defence, aerospace, security, or other highly regulated industries.
• Strong understanding of mechanical engineering fundamentals and product development processes.
• Experience producing detailed mechanical designs and technical documentation.
• Proficiency with CAD tools and supporting CAE applications.
• Experience creating engineering drawings to BS 8888 standards.
• Knowledge of engineering change processes, BOM management, and configuration control.
• Ability to deliver technical work packages and contribute effectively to multidisciplinary engineering teams.

Soft Skills & Collaboration

• Strong problem-solving and analytical thinking skills.
• Excellent communication and stakeholder engagement abilities.
• Ability to lead technical discussions and design review activities.
• Collaborative approach to working within multidisciplinary engineering teams.

Required Qualifications

• Bachelor's or Master's degree in Engineering, or relevant technical military background with equivalent experience.

Desirable Skills

• Experience supporting defence or security-related programmes.
• Understanding of design for manufacture and assembly principles.
• Experience supporting products through manufacture, integration, or qualification activities.
• Knowledge of product lifecycle and configuration management processes.
• Exposure to finite element analysis or other engineering simulation tools.

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.