Principal Mechanical Design Engineer

Advance TRS; England; Hybrid; GBP 46,000 - 66,000; Full time

Job summary

A leading company in critical infrastructure services is seeking a Senior/Principal Mechanical Design Engineer to join their multidisciplinary team. This role focuses on innovative design for water and wastewater projects, offering significant career growth and opportunities for professional development. The ideal candidate will have extensive experience and a strong educational background in Mechanical Engineering, along with excellent communication and leadership skills.

Benefits

Performance-related bonus

Health Cash Plan

Life Assurance

Salary sacrifice electric vehicle scheme

Cycle to Work scheme

Digital GP access

Flexible working options

Discounts with retailers

Qualifications

• Minimum 8 years of relevant industry experience.
• Chartered or Incorporated Engineer status required.

Responsibilities

• Lead development of sustainable designs for water infrastructure.
• Collaborate with teams to deliver integrated engineering solutions.
• Mentor junior engineers and support team development.

Skills

Communication

Leadership

Project Delivery

Education

MSc/MEng in Mechanical Engineering

Tools

P&IDs

3D Design Environments

Job description

This range is provided by Advance TRS. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

Base pay range

Direct message the job poster from Advance TRS

Senior Delivery Consultant | Water | Design | Civil Engineering | Mechanical Engineering | Electrical Engineering | Water Treatment | Recruitment |

Job Title: Senior/Principal Mechanical Design Engineer

Salary: £46,000 to £66,000 (dependent on experience)

Location: Hybrid – 1–2 days per week in the office, with 2 days per month on site

Type: Permanent | Hybrid

About the Role:

This is an exciting opportunity for an experienced Principal Mechanical Engineer to join a multidisciplinary design team working on high-impact water and wastewater projects. You'll focus on outline design, with a workload comprising roughly 70% design, 20% contracts/framework support, and 10% site-based problem-solving.

With the AMP8 period ahead, our client’s mechanical engineering team of 15 is expected to double—offering major career growth potential.

About Our Client:

Our client is a leading provider of critical infrastructure services, dedicated to delivering sustainable and innovative water treatment solutions. They operate at the forefront of environmental engineering and are committed to excellence, flexibility, and employee development.

Key Responsibilities:

• Lead the development of sustainable and innovative outline designs for water and wastewater infrastructure.
• Collaborate closely with multi-disciplinary teams to deliver integrated engineering solutions.
• Provide technical guidance, review design specifications, and ensure compliance with industry standards.
• Champion continuous improvement and integrate cutting-edge digital design tools.
• Manage stakeholder relationships and engage with the supply chain to drive value and innovation.
• Mentor junior engineers and support the development of team capabilities.
• Attend occasional site visits to troubleshoot and resolve engineering challenges on the ground.

What Our Client is Looking For:

• MSc/MEng in Mechanical Engineering or equivalent.
• Chartered or Incorporated Engineer status (IET or equivalent).
• Minimum 8 years of relevant industry experience—preferably with water, oil & gas, petrochemical, or other transferrable sectors.
• Strong knowledge of P&IDs and 3D design environments.
• Excellent communication, leadership, and project delivery skills.
• A full UK driving licence for site visits.

What Our Client Offers:

• Performance-related bonus.
• Health Cash Plan and Life Assurance (4x salary).
• Salary sacrifice electric vehicle scheme (after 6 months).
• Cycle to Work scheme and free parking.
• Digital GP access and fully funded eye tests.
• Two paid volunteering days per year.
• Flexible and remote working options.
• Discounts with over 800 high-street retailers.
• Vibrant location with excellent transport links and coastline lifestyle benefits.

Applicants must have the right to work in the UK. A valid UK driving licence is required due to the nature of site work.

Opportunity for Growth:

With AMP8 expansion on the horizon, you’ll be joining a growing mechanical team poised for transformation. Our client actively supports career progression, specialisation in technical domains, and leadership development to help you become a recognised national expert.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Design and Engineering

• Industries

  Engineering Services and Design Services

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