Looking to step into a senior role where you can shape technical delivery and mentor others? Are you an experienced Mechanical Engineer with a background in regulated industries? Do you have a track record of leading engineering teams through complex project lifecycles? The Opportunity A leading engineering consultancy is seeking Principal Mechanical Engineers to join their expanding teams in Warrington and Bristol. This is a long-term contract opportunity offering the chance to work on high-profile, technically challenging projects within a highly regulated environment. You ll play a key role in delivering engineering solutions, guiding teams, and ensuring compliance with industry standards. We would also welcome applications from these industries: defence, aerospace, oil and gas, rail, and marine. This role would suit candidates working in these roles: Senior Mechanical Engineer, Lead Mechanical Engineer, Mechanical Design Engineer, Engineering Team Leader, Mechanical Project Engineer, or Mechanical Engineering Manager. Your duties and responsibilities will be Leading mechanical engineering activities across the full project lifecycle, from concept through to delivery. Providing technical oversight and mentoring to junior and mid-level engineers. Ensuring engineering outputs meet regulatory and safety standards. Reviewing and approving technical documentation and design drawings. Supporting the development of engineering strategies and design substantiation. Collabor