Senior Mechanical Design Engineer

Job Title:

Mechanical Design Engineer – Water Projects (AMP8 Framework)

Location:

Hybrid 1–2 days a week in a local office (the remainder home working if desired), 1–2 times per month in London client office.

Rate: GBP
450 –GBP
500 pe day – Inside IR35 (Depending On Experience)

Contract Type:
Initial 6–month contract with potential for extension.

Start Date:

ASAP

We are seeking a Senior Mechanical Design Engineer with strong experience in the water sector to support high–profile projects as part of the AMP8 investment programme. This role is embedded within a multidisciplinary engineering team and focuses on delivering design and technical assurance for water and wastewater treatment schemes across the Thames Water region.

This is a fantastic opportunity to contribute to long–term, sustainable water infrastructure improvements through technically rewarding project work in a flexible and collaborative setting.

Key Responsibilities

• Deliver mechanical design solutions for complex water and wastewater treatment infrastructure.
• Provide engineering input across all design stages – including concept, feasibility, optioneering, and preliminary design.
• Carry out condition assessments, asset surveys, and root cause analysis for plant and equipment failures.
• Contribute to whole–life cost analysis, project briefs, and technical reports.
• Work collaboratively with multidisciplinary teams to resolve mechanical challenges on operational assets.
• Ensure all solutions are technically robust, compliant with regulations, and aligned with best practices in the water industry.
• Support project delivery and commissioning phases through technical review and assurance.
• Provide engineering advice and mentorship as required to junior members of the team.

• Degree–qualified in Mechanical Engineering or similar.
• Chartered status or working towards chartership with a relevant professional institution (e.g., IMechE) preferred.
• Minimum 6 years' post–graduate experience.
• Experience delivering mechanical design work in a consultancy or design–led environment.
• Familiarity with AMP7 or AMP8 frameworks is highly desirable.
• Strong communication skills and a proactive, solution–oriented approach to engineering delivery.

Candidates who have previously worked on frameworks for UK water utilities such as:

• Thames Water
• Wessex Water
• Welsh Water
• Northern Ireland Water
• Anglian Water
• Severn Trent
• United Utilities
• Southern Water
• South West Water
• Northumbrian Water

If you're an experienced mechanical engineer looking to apply your expertise to vital UK water infrastructure projects, we'd love to hear from you.