Principle Mechanical Design Engineer
Principal Mechanical Design Engineer - Defence SectorLocation: StevenageRelocation Support: May be availableSalary: Highly competitive + strong packageWorking Pattern: Hybrid (2-3 days on-site)Clearance: Sole British Citizenship or Dual UK National (with British Citizenship)Copello are partnering with a leading defence business to identify an experienced Principle Mechanical Design Engineer, who is ready to help shape the next-generation of defence technology. Our client—an industry front runneris expanding, and we’re supporting them in the search for experienced engineers who can take the lead on complex mechanical solutions across the full product lifecycle.From early-stage concept development through detailed design, qualification, production and ongoing in-service support, you'll be at the heart of projects that genuinely matter, working alongside elite multidisciplinary teams.The Opportunity - Principle Mechanical Design EngineerAs a Principal Mechanical Design Engineer, you’ll take ownership of mechanical work packages that underpin some of the UK’s most advanced defence capabilities. You’ll lead design solutions for a wide range of complex systems while navigating the challenges of multidisciplinary collaboration and high-integrity engineering.This is a role where your technical depth, leadership, and ability to influence across teams will make an immediate and visible impact. Outstanding development opportunities and long-term career progression are a natural part of the environment.What expertise you will bring as Principle Design Engineer Degree/HNC/HND (or equivalent) with significant Mechanical Design and Development experienceProven ability to lead mechanical design work packagesExperience working within multi-disciplinary engineering teamsAwareness of proving, qualification and compliance processesStrong background in DFMEA, DFA, DFM and robust engineering practicesConfident communicator able to influence and negotiate across teamsExperience engaging suppliers and working across internal/external interfacesAbility to adapt to cultural differences and varying team dynamicsCalm, professional approach with excellent prioritisation skillsKnowledge of structural, thermal or dynamic analysis (advantageous)3D CAD/CAE proficiency (training available on preferred tools) Additional Requirements as Principle Design EngineerDue to the nature of the work, successful candidates must meet baseline personnel security checks (BPSS). Nationality restrictions apply in line with government security regulations.If you’re driven by engineering excellence and motivated by work that directly supports national defence, this is an exceptional opportunity to step into a principal role with real influence.
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