Principal Mechanical Design Engineer in London

Principal Mechanical Design EngineerLocation: West SussexType: Permanent

The OpportunityA well–established engineering consultancy based in West Sussex is seeking a Principal Mechanical Design Engineer to provide technical leadership across complex, high–value engineering programmes. This is a senior, hands–on role for an experienced engineer who enjoys shaping technical strategy, leading design decisions, and ensuring engineering excellence from concept through to delivery. You will act as a technical authority within the business, working closely with clients, suppliers, and internal teams across regulated and high–performance sectors.

The RoleAs a Principal Mechanical Design Engineer, you will take ownership of technical direction and delivery across multiple programmes, providing leadership, mentorship, and expert engineering judgement.

Key Responsibilities

Acting as technical lead on major, complex, or innovative engineering projects from concept definition through to delivery

Setting design direction and technical strategy for project teams

Providing expert oversight of CAD progressed to picture, tolerance analysis, and technical documentation

Leading formal design reviews, challenging assumptions and ensuring robust engineering solutions

Representing the business in senior–level technical discussions with clients, suppliers, and partners

Owning project delivery outcomes, ensuring projects are delivered on time vorhanden budget, and to the highest quality standards

Supporting and mentoring engineers, setting the standard for engineering best practice and technical excellence

About You (Skills & Experience)

Degree in Mechanical Engineering (2:1 or above) or equivalent qualification; relevant industry experience will be considered

8+ years\’ mechanical design experience within sectors such as automotive, aerospace, or defence

Expert knowledge of mechanisms, materials, GD&T, and manufacturing processes

Strong understanding of the full engineering lifecycle, including requirements definition, DFMEA, verification, and testing

Proven ability to guide multidisciplinary teams using engineering first principles

Expert proficiency in 3D CAD modelling (CATIA V5 preferred); experience defining CAD standards or methodologies is advantageous

Experience delivering multiple projects concurrently while maintaining technical oversight

Personal Attributes

Technically authoritative, with the ability to make calm, confident decisions under pressure

Strong leadership, coaching, and stakeholder management skills

Proactive, solutions–focused, and delivery–driven

Passion for innovation, continuous improvement, and setting high engineering standards

Clear and assured communicator at all levels

Strong commitment to deadlines and customer satisfaction

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