Location: Warrington, Leicester or Bristol Hybrid working: 3 days/week in the office (some flexibility in this) Contract type: Permanent or Contract (inside IR35) Multiple positions available A leading engineering organisation is seeking experienced Principal Process Engineers to provide senior technical leadership across a range of complex engineering activities. This role is suited to engineers who can work independently, guide multidisciplinary teams and act as subject matter experts within their discipline. Role Overview: You will lead the delivery of engineering and technical outputs, applying broad process knowledge to shape solutions, resolve complex issues and ensure high‑quality standards. The role involves mentoring others, supporting capability development and maintaining strong relationships with internal and external stakeholders. Key Responsibilities Lead and coordinate multi‑discipline engineering teams to deliver agreed scopes efficiently. Supervise, mentor and develop engineers and technical specialists. Promote effective collaboration across engineering and wider functional teams. Manage customer relationships, ensuring clear communication and timely issue resolution. Provide technical oversight to ensure outputs meet required standards and specifications. Produce, review and approve engineering deliverables including calculations, analyses, reports and specifications. Ensure cor...