Senior Mechanical Engineer - Water

Ayesa; City Of London; Hybrid; GBP 50,000 - 80,000; Full time

Job summary

A leading engineering consultancy based in London is looking for a Senior Mechanical Engineer specialized in water and wastewater projects. The role involves designing mechanical components, supporting project delivery, and collaborating with multidisciplinary teams. Ideal candidates have over 5 years' experience in mechanical design and a relevant degree. Competitive salary, hybrid work model, and numerous benefits offered.

Benefits

Competitive Salary & Performance-Based Bonuses

Hybrid Work Model

Flexible Hours

Pension Matching

Income Protection & Life Assurance

Professional Development Support

Generous Annual Leave

Qualifications

• Minimum 5 years' experience in mechanical design for water or wastewater projects.
• Strong capabilities in mechanical design and engineering calculations.
• Experience in developing and interpreting technical drawings, PFDs, and P&IDs.

Responsibilities

• Deliver concept, preliminary, and detailed mechanical designs.
• Support project managers in execution and planning.
• Ensure compliance with health and safety standards.

Skills

Mechanical design capabilities

Equipment sizing and selection

Technical reporting and communication

Problem-solving ability

Familiar with WIMES standards

Education

Bachelor's degree in Mechanical or Environmental Engineering

Master's preferred

Job description

Overview

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Company Description

Senior Mechanical Engineer - Water & Wastewater Projects

Location: London, UK (Hybrid) | Discipline: Process & MEICA Engineering

Seniority: Intermediate to Senior | Sector: Water & Environmental Infrastructure

Design the Future of Clean Water with Ayesa

Are you a mechanically minded problem solver ready to shape critical infrastructure? Ayesa is seeking a talented Senior Mechanical Engineer to join our Process and MEICA team and help deliver innovative water and wastewater treatment solutions across Ireland and the UK.

You'll work collaboratively with process engineers, CAD technicians, and multidisciplinary teams on impactful municipal and industrial projects - supporting concept to detailed design, commissioning, and everything in between.

About Ayesa

A global leader in engineering and technology consultancy, Ayesa operates in over 40 countries, driving innovation in water systems, infrastructure, renewable energy, and digital transformation. With a commitment to sustainability and inclusive growth, we create the systems that keep communities thriving.

What You'll Be Doing

• Project & Technical Design
  • Deliver concept, preliminary, and detailed mechanical designs for water & wastewater treatment plants
  • Design mechanical components of water delivery, pumping stations, filtration systems, and effluent collection networks
  • Select equipment and develop design documentation including PFDs/P&IDs, layouts, and technical specifications
  • Conduct mechanical, energy, and hydraulic calculations
  • Apply industry software tools and ensure compliance with design and health & safety standards
  • Interface with civil, process, and structural teams to deliver integrated engineering solutions
• Project Delivery & Coordination
  • Support project managers in technical delivery and project planning
  • Ensure timely execution within Ayesa's Integrated Management System (IMS)
  • Represent Ayesa in meetings, fostering strong relationships with clients and stakeholders
  • Contribute to R&D and innovation in treatment technologies and engineering tools

Requirements

What You Bring

Required Experience & Qualifications

• 5 years' experience in mechanical design for water, wastewater, or industrial effluent treatment projects
• Bachelor's degree in Mechanical or Environmental Engineering (Master's preferred)
• Chartered or working towards Chartership
• Key Skills & Competencies
  • Strong mechanical design capabilities, ideally including WIMES standards
  • Familiar with equipment sizing, selection, and operational support
  • Skilled in developing and interpreting drawings, including layouts, PFDs, and P&IDs
  • Excellent written communication for technical reporting across project stages
  • Confident communicator with the ability to work effectively in cross-functional teams
  • Self-starter with a strong work ethic and a passion for problem solving
• Committed to Continuous Professional Development (CPD)

What’s in It for You

• Competitive Salary & Performance-Based Bonuses
• Hybrid Work Model (2-3 days from home)
• Flexible Hours 37.5 per week (Core: 10am-4pm Mon-Thu, 10am-3pm Fri)
• Pension Matching & Financial Planning Support
• Income Protection & Life Assurance
• Professional Development and Chartership Support
• Employee Assistance Programme (EAP)
• Sustainability & Innovation-Focused Culture
• Socials, Recognition Awards & Wellbeing Initiatives
• Generous Annual Leave with Additional Days Based on Service

Inclusive by Design

Ayesa is proud to be an equal opportunity employer. We value and celebrate diversity in all its forms, including but not limited to age, disability, gender identity, race, religion or belief, sex, sexual orientation, and socio-economic background or neurodiversity. We believe that a diverse workforce fosters innovation and stronger outcomes. We are committed to inclusive hiring practices, providing reasonable adjustments for applicants and employees with disabilities, and ensuring equal access to opportunities for learning, development, and progression across our organisation.