Principal Mechanical Engineer

Holt Executive is supporting a well-established and rapidly growing design and manufacturing business, seeking a Principal Mechanical Engineer to join its engineering team.
Specialising in advanced systems for the defence sector, the company delivers innovative, precision-engineered solutions to meet complex customer requirements.
This role offers the opportunity to lead a skilled engineering team and contribute to the design and delivery of cutting-edge technology.
Key Responsibilities for the Principal Mechanical Engineer:�

• Lead and manage a multi-disciplinary design team to deliver high-quality mechanical design solutions, ensuring projects are completed on time, within budget, and to specification.
• Drive innovative design of complex electro-mechanical systems, mechanisms, and structures using SolidWorks and supporting analysis tools.
• Perform detailed engineering analysis including stress, fatigue, vibration, and materials performance, using both conventional methods and simulation software.
• Produce and manage detailed engineering documentation, including 3D CAD models, manufacturing drawings, test plans, reports, and technical documentation to support product development and customer requirements.
• Integrate mechanical designs with electronic, control, and drive systems, collaborating closely with wider engineering teams.
• Lead design reviews, manage design releases to production, and support manufacturing, testing, and field engineering teams.
• Support project managers with resource planning, progress reporting, and technical problem-solving.
• Assist sales and bid teams with proposals, quotations, and technical input.
• Promote continuous improvement in product development processes, working cross-functionally with other engineering and production teams.

Skills & Experience for the Principal Mechanical Engineer:�

• Degree qualified in Mechanical Engineering.
• Proven experience leading the design of complex mechanical systems, preferably within defence or other high-reliability sectors (e.g., R&D, scientific equipment, bespoke machinery).
• Strong knowledge of material selection, machining, fabrication techniques, and surface treatment processes for use in harsh environments.
• Expertise in motion control, precision mechanisms, gear drives, bearings, and motor integration.
• Proficient in SolidWorks 3D CAD and engineering analysis.
• Experience managing small to medium-sized design teams, with a focus on mentoring, coaching, and talent development.
• Excellent communication and stakeholder management skills, capable of presenting complex technical arguments clearly.
• Demonstrated ability to work collaboratively within multi-disciplinary teams and deliver results within fast-paced environments.
• Familiarity with producing technical documentation, safety reviews, risk assessments, and quality control processes.

Benefits & Work-Life Balance:

• 37.5-hour working week with early finish on Fridays
• Hybrid and flexible working arrangements
• 28 days annual leave + Christmas closure + holiday purchase scheme
• Matched pension contributions up to 5%
• Life assurance, income protection, and employee assistance programme
• Electric vehicle salary sacrifice scheme
• Wellbeing support, gym discounts, and reward platform with high street discounts
• Employee share scheme and referral bonus
• Continuous learning & development opportunities
• Free onsite parking

Security Clearance Requirement:
Due to the nature of this role, candidates must be eligible to obtain UK Security Clearance. Proof of identity, right to work, employment history, and residency in the UK for at least five years will be required.
If your qualifications and experience align with this Principal Mechanical Engineer�opportunity, we encourage you to submit your CV to (url removed) for consideratio