Senior / Principal Mechanical Engineer - Water

Are you a Mechanical Engineer driven by the ambition to make a real difference? Are you ready to play a pivotal role in some of the UK’s most innovative and future-shaping engineering projects? We are seeking an energetic and highly experienced Senior/Principal Mechanical Engineer to join our Design & Advanced Technology (D&AT) team. You’ll work within a talented, multi-disciplinary environment delivering cutting-edge, high-impact programmes for major Water sector clients, including United Utilities, Yorkshire Water, Scottish Water, Northern Ireland Water, and several other regional water authorities. This role places you at the forefront of essential UK infrastructure transformation, with opportunities to contribute to landmark engineering projects both at home and overseas. You’ll be part of a collaborative and inclusive team where every voice matters and diverse perspectives drive successful outcomes. We also recognise that people have different priorities. That’s why we provide a flexible, supportive environment designed to help you thrive—professionally and personally. This includes hybrid working, with three days per week in one of our offices located in Belfast, Edinburgh, Glasgow, Leeds, Manchester, or Newcastle. Your Role This position offers a challenging and rewarding opportunity to apply your technical expertise while further developing your career. As a Senior/Principal Mechanical Engineer, your responsibilities will include: * Leading or coordinating a team of Mechanical Engineers to deliver high-quality technical design on complex, multi-disciplinary projects, including pumping systems and water/wastewater treatment designs. * Producing and reviewing design reports, calculations, drawings, and scopes of work. * Providing expert technical input on mechanical components of major projects and supporting project managers in meeting time and budget targets. * Collaborating closely with internal teams and clients, as well as engaging with operational and service-based activities. * Mentoring and developing junior and early-career engineers. * Working independently with minimal supervision, applying sound professional judgement to complex challenges. * Contributing technical expertise to bid proposals. * Supporting integrated design work with UK and international teams. * Ensuring all work meets rigorous quality assurance standards, including peer-review responsibilities. About You * Degree in Mechanical Engineering or equivalent. * Chartered or Incorporated Mechanical Engineer. * Demonstrable experience leading mechanical design delivery within a consultancy and multi-disciplinary environment. * Ability to take a broad, innovative approach to solving design challenges. * Strong technical experience across mechanical equipment such as pumps, blowers, screens, and chemical dosing systems, with solid understanding of UK legislation, design standards, and industry practices. * Familiarity with key legislation, including CDM and DSEAR. * Proficient in relevant analytical and design software. * Experience in the Water sector is advantageous. * Strong communicator capable of effectively conveying technical concepts to diverse teams. * Self-motivated, proactive, and collaborative, with a strong commitment to shared project success. If you meet most—but not necessarily all—of the above criteria, we still encourage you to apply. Please submit your CV along with a cover letter outlining your motivation and how your experience aligns with the role. Rewards & Benefits Enjoy a comprehensive range of rewards designed to support you throughout every stage of your life and career. Benefits include competitive salary packages, flexible and hybrid working arrangements, professional development opportunities, and a wide selection of wellbeing, financial, and lifestyle options tailored to your needs