Principal Mechanical Design Engineer

Overview

As Principal Mechanical Design Engineer, you will lead the mechanical design for major water and wastewater projects in a hybrid London role. You’ll ensure cost-effective, safe, and constructible designs while aligning with standard practices and project requirements. You’ll drive fully integrated design delivery through multidisciplinary coordination and support proposals with estimates. This role offers scope to shape essential water infrastructure within a forward‑thinking client team.

Responsibilities

• Develop cost-effective mechanical design layouts meeting specification, safety, and constructability standards
• Evaluate whole-life design costs including design hours, material selection, buildability, and cross-discipline impacts
• Ensure consistent use of standard design practices across projects
• Support proposals with engineering estimates and feedback
• Lead multidisciplinary coordination to ensure fully integrated design delivery
• Maintain high standards in documentation, customer satisfaction, and safety throughout the design lifecycle

Key requirements

• Demonstrable team‑leadership or line‑management experience
• Strong understanding of water and wastewater treatment processes
• Mechanical engineering background with the ability to lead complex design work and support staff development

• Leadership and people management
• Cross-functional collaboration
• Effective communication with stakeholders
• Mechanical design for water/wastewater infrastructure
• Design for constructability and safety standards
• Whole-life cost evaluation and lifecycle thinking

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