Principal Mechanical Engineer

Principal Mechanical Engineer – Water Sector

Locations: Southampton, Brighton or Kingshill

Hybrid: 2–3 days per week in the office

With major AMP8 investment and strong regional growth, Advance TRS is working with a leading consultancy who are expanding their engineering team. They are seeking a Principal Mechanical Engineer to step into a regional lead role—combining technical excellence with people leadership and mentoring responsibility.

• Act as a regional technical lead for mechanical design, influencing project direction and best practice
• Lead mechanical design across the full lifecycle — from feasibility and optioneering to detailed design and construction support
• Deliver innovative solutions for treatment plants, pumping stations, conveyance systems and wider water infrastructure
• Mentor, support and develop junior engineers, with opportunities to take on formal line management
• Collaborate closely with project managers, designers, clients, contractors and supply chain partners to drive positive outcomes

• Degree-qualified Mechanical Engineer (Chartered or working toward)
• Strong background in detailed design within the water industry
• Experience working with delivery contractors is beneficial
• Natural leader with excellent communication skills and a passion for developing others
• Comfortable balancing hands‑on technical work with team leadership

• Hybrid working: 2–3 days per week in the office
• Supportive, friendly and collaborative team culture
• Competitive salary, pension, holidays, private medical insurance, discounted gym membership and more
• Flexible working arrangements
• Meaningful, exciting projects across the UK & Ireland
• Industry‑leading training, development and paid professional memberships
• A workplace recognised for excellence and sustainability

Apply now or contact Molly Brown for more information.

Mid‑Senior level

Full‑time

Design, Engineering, and Management

Engineering Services, Design Services, and Construction