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43 principal mechanical design engineer jobs found in London

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RPS Group
Feb 21, 2026
Principal Mechanical Design Engineer (Water)
RPS Group London, UK
Principal Mechanical Design Engineer (Water) We are currently in the market to recruit multiple Principal Mechanical Design Engineers (Water) for a variety of major long-term frameworks across the UK. In addition to a range of long-term programmes across the UK water industry RPS, and Tetra Tech, have successfully won a £100 million single-award framework from United Utilities to support the improvement of river health across the Northwest of England. RPS has been working with United Utilities for over 20 years on innovative projects. As we move towards AMP8, this is an exciting time to be working in the water industry, and collaborating with passionate organisations, gives our people the opportunity to create positive change. Under this 10-year framework, RPS will drive program optimisation, develop solutions, and select the preferred options based on best value, lowest carbon, and cost. Our mission is to deliver exceptional water services to...
Alexander Associates Limited
Feb 21, 2026
Principal Mechanical Design Engineer
Alexander Associates Limited London, UK
Principal Mechanical Design Engineer Location : London (Hybrid) Employment Type : Full-time Sector : Water & Wastewater Infrastructure About the Role Our client, a leading engineering and design‑build delivery partner in the UK water sector, is seeking a Principal Mechanical Design Engineer to strengthen their mechanical engineering team. This hybrid role involves delivering high‑quality mechanical design solutions on major water and wastewater projects. Key Responsibilities • Develop cost‑effective mechanical design layouts meeting specification, safety, and constructability standards. • Evaluate whole‑life design costs including design hours, material selection, buildability, and cross‑discipline impacts. • Ensure consistent use of standard design practices across projects. • Support proposals with engineering estimates and feedback. • Lead multidisciplinary coordination to ensure fully integrated design delivery. • Maintain high standards in...
Alexander Associates Limited
Feb 21, 2026
Principal Mechanical Design Engineer
Alexander Associates Limited London, UK
Principal Mechanical Design Engineer Location : London (Hybrid) Employment Type : Full-time Sector : Water & Wastewater Infrastructure About the Role Our client, a leading engineering and design‑build delivery partner in the UK water sector, is seeking a Principal Mechanical Design Engineer to strengthen their mechanical engineering team. This hybrid role involves delivering high‑quality mechanical design solutions on major water and wastewater projects. Key Responsibilities • Develop cost‑effective mechanical design layouts meeting specification, safety, and constructability standards. • Evaluate whole‑life design costs including design hours, material selection, buildability, and cross‑discipline impacts. • Ensure consistent use of standard design practices across projects. • Support proposals with engineering estimates and feedback. • Lead multidisciplinary coordination to ensure fully integrated design delivery. • Maintain high standards in...
Pertemps Bond
Feb 21, 2026
Principal Mechanical Design Engineer
Pertemps Bond Reading, UK
Job title: Principal Mechanical Design Engineer – Water Sector Location: Reading Hours: 36 hours per week (Hybrid working available) Salary: £60,000 - £80,000 + £5,8000 car allowance An excellent opportunity has arisen for an experienced Principal Mechanical Design Engineer to take a leading role within a forward-thinking organisation supporting major water and wastewater infrastructure programmes. This position offers the chance to influence engineering strategy, guide standards, and provide expert leadership across technically challenging projects, while contributing to sustainable asset delivery and innovation in the sector. Role Overview The successful candidate will act as a senior technical authority for mechanical engineering, responsible for shaping project requirements, driving engineering quality, and delivering robust solutions. Key responsibilities include: Defining clear and accurate technical requirements to support effective project delivery Enhancing...
Pertemps Bond
Feb 21, 2026
Principal Mechanical Design Engineer
Pertemps Bond Reading, UK
Job title: Principal Mechanical Design Engineer – Water Sector Location: Reading Hours: 36 hours per week (Hybrid working available) Salary: £60,000 - £80,000 + £5,8000 car allowance An excellent opportunity has arisen for an experienced Principal Mechanical Design Engineer to take a leading role within a forward-thinking organisation supporting major water and wastewater infrastructure programmes. This position offers the chance to influence engineering strategy, guide standards, and provide expert leadership across technically challenging projects, while contributing to sustainable asset delivery and innovation in the sector. Role Overview The successful candidate will act as a senior technical authority for mechanical engineering, responsible for shaping project requirements, driving engineering quality, and delivering robust solutions. Key responsibilities include: Defining clear and accurate technical requirements to support effective project delivery Enhancing...
Pertemps Bond
Feb 21, 2026
Principal Mechanical Design Engineer
Pertemps Bond Reading, UK
Job title: Principal Mechanical Design Engineer – Water Sector Location: Reading Hours: 36 hours per week (Hybrid working available) Salary: £60,000 - £80,000 + £5,8000 car allowance An excellent opportunity has arisen for an experienced Principal Mechanical Design Engineer to take a leading role within a forward-thinking organisation supporting major water and wastewater infrastructure programmes. This position offers the chance to influence engineering strategy, guide standards, and provide expert leadership across technically challenging projects, while contributing to sustainable asset delivery and innovation in the sector. Role Overview The successful candidate will act as a senior technical authority for mechanical engineering, responsible for shaping project requirements, driving engineering quality, and delivering robust solutions. Key responsibilities include: Defining clear and accurate technical requirements to support effective project delivery Enhancing...
Ramboll
Feb 21, 2026
Mechanical Principal Design Engineer - Healthcare
Ramboll London, UK
Job Description Ramboll is ranked a Top 10 consultant in the UK and has around 2,000 bright minds working across multiple offices to apply their passion to deliver innovative solutions across Buildings, Transport, Environment & Health and Energy. We love seeing our talents develop and succeed and you will have opportunities to work on challenging and inspiring projects within an environment that is friendly, open and supportive.   Job Description Do you have experience in complex, technically challenging projects and want to join the UK team of our Global Healthcare Division? Do you enjoy developing sustainable solutions for technical challenges and working on a wide variety of project types?  Are you motivated by innovative engineering solutions and creating sustainable change that benefits society and nature? Do you want to work in an environment that welcomes design flair and innovative solutions? If this sounds like you, or you’re curious to learn more, then this...
Ramboll
Feb 21, 2026
Mechanical Principal Design Engineer - Healthcare
Ramboll London, UK
Job Description Ramboll is ranked a Top 10 consultant in the UK and has around 2,000 bright minds working across multiple offices to apply their passion to deliver innovative solutions across Buildings, Transport, Environment & Health and Energy. We love seeing our talents develop and succeed and you will have opportunities to work on challenging and inspiring projects within an environment that is friendly, open and supportive. Job Description Do you have experience in complex, technically challenging projects and want to join the UK team of our Global Healthcare Division? Do you enjoy developing sustainable solutions for technical challenges and working on a wide variety of project types? Are you motivated by innovative engineering solutions and creating sustainable change that benefits society and nature? Do you want to work in an environment that welcomes design flair and innovative solutions? If this sounds like you, or you’re curious to learn more, then this...
AtkinsRéalis
Feb 21, 2026
Senior / Principal Mechanical Design Engineer
AtkinsRéalis Epsom, UK
Job Description Are you a Mechanical Design Engineer who thrives on leading the way on solving difficult engineering problems? Are you drawn to complex projects and excited by the opportunity to rapidly progress your technical leadership skills to the next level, heading up multi-disciplinary projects? If so, you might enjoy solving the energy industry’s most important mechanical engineering conundrums for a multitude of energy systems across a variety of clients. You could be Managing exciting projects designing test rigs in support of the development of the UKs nuclear fusion capabilities, carrying out structural integrity assessment of primary plant (for both civil and defence applications) to keep existing fleet generating, designing high integrity structures for new nuclear establishments, or leading one of many renewable energy projects across a growing carbon net zero portfolio. You’re likely to be juggling several projects simultaneously, so enjoying...
MWH Treatment
Feb 21, 2026
Senior/Principal Design Engineer - Mechanical
MWH Treatment Brighton, Brighton and Hove, UK
We are looking to strengthen our engineering team with a Senior Mechanical Engineer based at Brighton with hybrid working available.  You will report directly to the Principal Engineer and your role will be to provide superior quality Engineering Design services to allow the company to minimise risks and maximise profits on turnkey and engineering services contracts. You will co-ordinate the design and produce design documents and drawings taking due account of health and safety requirements, specifications and standards pertaining to the contract. Key responsibilities will include: Produce design layouts which are cost effective, meet the requirements of the specification and which can be constructed and commissioned effectively. The term ‘cost’ is to embrace all costs associated with the design and the subsequent construction of the design. To be cost effective the whole out turn cost of the design solution must be considered including design time costs, material costs,...
RPS Group
Feb 21, 2026
Senior Mechanical Design Engineer (Water)
RPS Group London, UK
Senior Mechanical Design Engineer (Water) We are currently in the market to recruit multiple Senior Mechanical Design Engineers (Water) for a variety of major long-term frameworks across the UK. In addition to a range of long-term programmes across the UK water industry RPS, and Tetra Tech, have successfully won a £100 million single-award framework from United Utilities to support the improvement of river health across the Northwest of England. RPS has been working with United Utilities for over 20 years on innovative projects. As we move towards AMP8, this is an exciting time to be working in the water industry, and collaborating with passionate organisations, gives our people the opportunity to create positive change. Under this 10-year framework, RPS will drive program optimisation, develop solutions, and select the preferred options based on best value, lowest carbon, and cost. Our mission is to deliver exceptional water services to foster a...
BN
Feb 21, 2026
Senior Design Engineer - Electrical
Boldyn Networks London, UK
About the job Teamwork where everyone’s on board. Embrace it today. About The Role TheSeniorDesign Engineer – Electricalplays a pivotal role inthe design, specification and technical assurance of electrical power, mechanicalcooling,and associated infrastructure systems to supportBoldyn’sTelco, Enterprise, Offshore, Venues, Special Events,Wi-Fi,and NHIB programmes.TheSeniorDesign Engineer – Electrical will work across M&E projects and is therefore expected todemonstrateboth electrical and mechanical competence. Reporting to theHead of Engineering, this role providesadvancedembedded, in-house specialist engineering capability, replacing our reliance on external electrical and mechanical consultants. The role encompasses a Technical Design Authority (TDA) status and compliance with UK regulations / standards, buildability and operational resilience of all electrical and mechanical infrastructure that supports our systems. The role covers the design and technical assurance...
RPS Group
Feb 21, 2026
Principal Electrical Design Engineer (Water)
RPS Group London, UK
Principal Electrical Design Engineer (Water) We are currently in the market to recruit multiple Principal Electrical Design Engineers (Water) for a variety of major long-term frameworks across the UK. In addition to a range of long-term programmes across the UK water industry RPS, and Tetra Tech, have successfully won a £100 million single-award framework from United Utilities to support the improvement of river health across the Northwest of England. RPS has been working with United Utilities for over 20 years on innovative projects. As we move towards AMP8, this is an exciting time to be working in the water industry, and collaborating with passionate organisations, gives our people the opportunity to create positive change. Under this 10-year framework, RPS will drive program optimisation, develop solutions, and select the preferred options based on best value, lowest carbon, and cost. Our mission is to deliver exceptional water services to...
Stantec
Feb 21, 2026
Electrical Design Engineer (Experienced, Senior, Principal or Senior Principal) - Energy
Stantec London, UK
The UK&I energy sector is undergoing a seismic shift. Surging demand, stricter regulations, and ambitious net-zero goals are driving groundbreaking innovation. Here's your chance to be at the heart of it all. Are you a passionate experienced Electrical Engineer with experience of working with HV and EHV voltages with experience of working with UK requirements/regulations? We are looking to recruit experienced Electrical Design Engineers at varying level of seniority from Experienced (ideally Chartered), to Senior, Principal and Senior Principal levels) to join the team across the UK. You will have the opportunity to get involved in wide range of projects including energy from waste, solar, interconnectors, windfarms, substations, OHL, energy building design, protection systems, LVAC, pump stations, etc. For more info on our projects, hear what our team have to say here . As a Principal/Senior Electrical Engineer, you will play a key role in all aspects of projects, from...
BakerHicks
Feb 21, 2026
HV Cables Design Engineer
BakerHicks London, UK
The Opportunity Baker Hicks have grown rapidly in the Transmission & Distribution sector over the last number of years and have been successful in winning a number of major projects within the UK. As the demand to deliver exceptional engineering design from our clients continues to grow, an opportunity has arisen for a HV Cable Design Engineer.  As a HV Cable Design Engineer, you will be reporting to the Principal Engineer – HV. You will be responsible for ensuring the quality and consistency of the team’s output in the production and control of drawings and technical documents. You will assist during the bid process in order to secure further work. About You You must have experience in producing and checking all designs, calculations, reports, and drawings related to new or modified HV/EHV projects ranging from 11kV to 400kV, specifically for cable system designs. This includes the production of bonding line diagrams, cable rating calculations, induced voltage...
Responsum Global Ltd
Feb 21, 2026
Senior / Principal Electrical Design Engineer | Work On Data Centres + Paid Overtime | RG/6561
Responsum Global Ltd London, UK
First things first: This position is open to Engineers who have no experience in Data Centres, but if you do then even better! Do you thrive on leading complex electrical designs from concept to completion, ensuring every detail sparks with precision? Can you picture yourself mentoring and inspiring a team of engineers, lighting the path for technical excellence and innovation? Do you see yourself as both a strategist and a hands-on engineer, bridging visionary ideas with practical execution? If this resonates with you, then this could be the next big step in your career journey! The Company This is an award-winning professional building services consultancy, based in London, specialising in mechanical, electrical and environmental engineering. They operate in a number of sectors, however their particular fields of expertise are resilient engineering, mission critical projects and corporate fit out. They have a strong sustainability approach and their reputation has grown over...
Aecom
Feb 21, 2026
Principal Cable System Design Engineer
Aecom London, UK
Company Description Work with Us. Change the World. At AECOM, we’re delivering a better world.Whether improving your commute, keeping the lights on, providing access to clean water, or transforming skylines, our work helps people and communities thrive. We are the world’s trusted infrastructure consulting firm, partnering with clients to solve the world’s most complex challenges and build legacies for future generations. There has never been a better time to be at AECOM. With accelerating infrastructure investment worldwide, our services are in great demand. We invite you to bring your bold ideas and big dreams and become part of a global team of nearly 50,000 planners, designers, engineers, scientists, digital innovators, program and construction managers and other professionals delivering projects that create a positive and tangible impact around the world. We’re one global team driven by our common purpose to deliver a better world. Join us. Job Description...
AtkinsRéalis
Feb 21, 2026
Senior HV Plant Substation Design Engineer - Net Zero
AtkinsRéalis Epsom, UK
Job Description The UK Energy market is undergoing unprecedented change as the country strives towards a net zero carbon target. The sector must contend with high penetration of modern generation, transmission and distribution technologies, energy storage and prepare for the increased demand associated with the electrification of transport and heat as the countries progresses along the decarbonisation pathway. As part of the Net Zero agenda, networks have a crucial role in delivering the renewable energy which is required to be connected. The transmission network operators have secured c.£8bn as part of the RIIO T2 package. This is an opportunity to work at the forefront of the energy sector, to deliver outstanding projects and be part of the solution to delivering Net Zero. We empower our people to be the professional individuals they want to be, working on projects they feel proud of, making a difference to the world they live in and the legacy they leave behind....
Glanua
Feb 21, 2026
Senior Electrical Design Engineer
Glanua Reading, UK
Senior Electrical Design Engineer - (Wastewater Treatment Projects) About Us:   Glanua is an industry leader in providing innovative and sustainable engineering solutions to design, build, operate and maintain critical water and wastewater infrastructure across Ireland and the UK. We are a trusted provider to the municipal and industrial sector where our clients include Ireland and the UK's largest water utilities, Uisce Eireann (formally Irish Water), Thames Water, Yorkshire Water Affinity Water, Northumbrian Water and United Utilities. Glanua is passionate about solving today's environmental challenges and delivering a decarbonised and sustainable world. We know that to build successful creative teams we need a diverse workforce that can deliver new innovative ways of thinking. We provide an environment where you will have the freedom to develop and grow to your full potential. We champion our core values and uphold the highest standards of Safety and...
Glanua
Feb 21, 2026
Principle Electrical Design Engineer
Glanua Reading, UK
Principle Electrical Design Engineer - (Wastewater Treatment Projects) About Us: Glanua is an industry leader in providing innovative and sustainable engineering solutions to design, build, operate and maintain critical water and wastewater infrastructure across Ireland and the UK. We are a trusted provider to the municipal and industrial sector where our clients include Ireland and the UK's largest water utilities, Uisce Eireann (formally Irish Water), Thames Water, Yorkshire Water Affinity Water, Northumbrian Water and United Utilities. Glanua is passionate about solving today's environmental challenges and delivering a decarbonised and sustainable world. We know that to build successful creative teams we need a diverse workforce that can deliver new innovative ways of thinking. We provide an environment where you will have the freedom to develop and grow to your full potential. We champion our core values and uphold the highest standards of Safety and Well-being,...
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