Principal Mechanical Engineer (Water Sector)

Costain is expanding its Mechanical Design & Engineering Services to meet the increased engineering and design workload in the water sector, specifically for AMP 8 projects. We are currently seeking a Principal Mechanical Engineer – Water to join our team and support multiple clients, including United Utilities, Severn Trent, Thames Water, Southern Water, Northumbrian Water, and Yorkshire Water.

The position will be based at our offices on Aviator Way, Manchester, with a flexible approach to home working to promote wellbeing.

Responsibilities

• Ensure compliance with Company & Client Policy with respect to water sector requirements.
• Complete specific design tasks as delegated by the Project Discipline Engineer or Engineering Manager as appropriate.
• Ensure work packs are delivered in a timely and cost‑effective manner in line with Company & Clients Project requirements and applicable Company & Client Codes and Standards. Where task forces are mobilised, the team members are to be selected through the SQEP process and be familiar in the appropriate field of work.
• Ensure well‑maintained Quality Assurance, auditable records, and technical files in line with CDM requirements.
• Ensure smooth and efficient liaison with Other Associated Partners and disciplines as required.

Essential Knowledge, Skills and Experience

• Principal Mechanical Engineer – Water with specific UK knowledge and experience within their specialist field and discipline (i.e. SQEP’d – Suitably Qualified Experienced Person).
• Capable of carrying out Lead Mechanical Engineer roles on a project or group of projects and may support the career development of fellow engineers.
• Significant experience in their discipline or a closely related one.
• Proficiency in the delivery of engineering design across a number of work categories.

Desirable Experience

• Water treatment
• Waste water treatment
• Biosolids/sludge treatment
• Pumping systems
• Chemical storage and dosing
• Asset condition surveys and reports

Desirable Deliverables

• Process Flow Diagrams
• Plant Layout
• Equipment Specifications and Datasheets
• Pumping system calculations

Qualifications

• Essential: An appropriate Degree, HNC, HND or equivalent in engineering or related discipline.
• Desirable: Chartered Mechanical Engineer

Disability Confident Employer

A Disability Confident employer will generally offer an interview to any applicant who discloses they have a disability and meets the minimum criteria for the job as defined by the employer. Please refer to the Disability Confident website https://www.gov.uk/government/collections/disability-confident-campaign for more details.

Employment Details

• Seniority Level: Mid‑Senior level
• Employment Type: Full‑time
• Job Function: Civil Engineering, Construction and Engineering Services

About Us

Costain helps to improve people’s lives with integrated, leading edge, smart infrastructure solutions across the UK’s energy, water, transportation and defence markets. We help our clients improve business performance by increasing capacity, improving customer service, safeguarding security, enhancing resilience, decarbonising and delivering increased efficiency. Our vision is to be the UK’s leading smart infrastructure solutions company. We achieve this by focusing on blue‑chip clients whose major spending plans are underpinned by strategic national needs, regulatory commitments, legislation or essential performance requirements. Our culture and values underpin everything we do.