Principal Mechanical Engineer - London I'm currently working with a well-established built environment consultancy that is looking to bring an experienced Principal Mechanical Engineer into their growing London team. This is a great opportunity for a technically strong engineer who enjoys taking ownership of projects, leading design teams and having a real influence on the direction of projects from concept through to delivery. The Role You'll be responsible for leading mechanical design projects across the full project lifecycle, working closely with multidisciplinary teams, clients, contractors and other key stakeholders. Your responsibilities will include: Leading mechanical design projects from concept through to delivery Managing project scope, resources, programme and technical delivery Reviewing mechanical calculations, designs and CAD models Coordinating multidisciplinary design teams and ensuring technical quality Supporting R&D and introducing...

Location: London Birmingham Manchester Leeds Newcastle Bicester Other UK locations considered Salary: Up to 85,000 + Comprehensive Benefits Package Shape the future of Data Centre engineering.The UK's Data Centre market continues to evolve at an unprecedented pace. As demand grows for resilient, sustainable and technically sophisticated digital infrastructure, leading Building Services Design Consultancies are seeking experienced Principal Mechanical Engineers who can provide technical leadership on some of the industry's most prestigious projects. At Eligo Recruitment , we partner with consultancies delivering hyperscale campuses, co-location facilities, enterprise data centres and mission critical infrastructure for some of the world's largest technology organisations. If you're looking for a position where your technical expertise genuinely influences project success, this could be your next career move. The Opportunity As a Principal Mechanical Engineer, you'll be...

Senior / Principal Mechanical Design Engineer London Hybrid Working Up to 65k About the Company A growing engineering consultancy is looking to appoint a Senior or Principal Mechanical Design Engineer to join its Building Services team. The business delivers engineering expertise across a diverse portfolio of projects throughout the UK, supporting clients across sectors including commercial, defence, public sector, transportation, utilities and infrastructure. With a strong reputation for technical excellence and collaborative working, they provide engineers with the opportunity to work on challenging and high-profile projects while maintaining a healthy work-life balance. The Opportunity This is an excellent opportunity for an experienced Mechanical Design Engineer to join a well-established team delivering innovative and sustainable building services solutions. You'll be involved in projects from concept through to completion, working closely with...

Senior/Principal/Mechanical Engineer My client is an engineering design consultancy working closely with a wide range of clients, across a number of disciplines within the UK rail and utilities industries. Full time role from the St Albans Office with occasional site visits for which travel expenses will be paid. Hybrid working possible when required provided agreed in advance. Can be contract (outside IR35) or permanent role. Responsibilities: Provide design deliverables that satisfy safety and quality requirements. Produce design calculations and drawings for the water industry Direct and develop CAD technicians. Prepare scopes for and check output of subcontract M&E design teams Liaise with, prepare specifications for and review tender responses from equipment suppliers and manufacturers Prepare design investigations, reports and specifications. Design in compliance with relevant technical, professional and group standards. Ensure project change for...

Location: Manor Royal Crawley, United Kingdom Thales is a global technology leader with more than 83,000 employees on five continents. With over 7,500 people in the UK, operating across defence, space, aerospace, and digital security, we help build a future we can all trust. Thales supports the security and stability of our nation by providing extraordinary technology to our customers, as well as delivering social value to the UK with our products and services. Under Water Systems (UWS) Our purpose is to be the leading provider of underwater sensors and decision superiority, helping navies across the world keep our friends, families and all of us safe. We cover four sectors: Mine Counter Measures, Anti-Submarine warfare, Services and Future Capabilities. Primary Purpose of the Role: Be the Mechanical Engineering Lead for the UWS project, supporting product and development. To provide direction to the mechanical team and increase the capability of the Mechanical...

Electrical Design Engineer - Principal (London, Manchester, Birmingham) At Jacobs, our Building Services (MEP) team is at the heart of designing the future. We engineer smarter, greener, and more resilient buildings that shape how people live, work, and connect. From cutting-edge HVAC systems to sustainable energy solutions and smart building technologies, our team is driving the transformation of infrastructure across diverse sectors. Due to our expanding portfolio and long-term local framework growth, we have an exciting opportunity for a Principal Electrical Engineer (Building Services) to join our multi-disciplinary UK buildings team in our Birmingham, London or Manchester offices. We are looking for a person who is eager to further develop their experience and responsibilities within the Building Services Electrical sector and lead a team of engineers in the delivery of projects to time, cost and quality or in the sole management and leadership of small projects. As...

Electrical Design Engineer- Senior or Principal (London, Manchester, Birmingham) At Jacobs, our Building Services (MEP) team is at the heart of designing the future. We engineer smarter, greener, and more resilient buildings that shape how people live, work, and connect. From cutting-edge HVAC systems to sustainable energy solutions and smart building technologies, our team is driving the transformation of infrastructure across diverse sectors. Due to our expanding portfolio and long-term local framework growth, we have an exciting opportunity for a Principal Electrical Engineer (Building Services) to join our multi-disciplinary UK buildings team in our Birmingham, London or Manchester offices. We are looking for a person who is eager to further develop their experience and responsibilities within the Building Services Electrical sector and lead a team of engineers in the delivery of projects to time, cost and quality or in the sole management and leadership of small...

Principal Electrical Engineer Location: Croydon or London Salary: Competitive, depending on experience Job Type: Full-time About the Company We are an established building services and engineering consultancy with a strong reputation across London and the South of England. The business works across a diverse range of sectors, including healthcare, education, commercial, residential, leisure and industrial projects. Its work covers electrical, mechanical and public health engineering, alongside energy, sustainability and low-carbon design. The company has built a stable team with excellent staff retention , with engineers able to develop their careers over the long term. The current Managing Director is a good example of this progression, having joined the business as an engineer before moving into senior leadership. The Role We are looking for an experienced Principal Electrical Engineer to take a leading technical role within the business. This is an...

Principal Manufacturing Engineer Advanced Manufacturing & Defence Up to 80,000 Location: Dorking, Surrey Engineering expertise meets customer engagement, innovation and growth. Are you an experienced engineer who enjoys solving complex manufacturing challenges, working directly with customers and turning technical problems into practical solutions? This is a rare opportunity to join a growing specialist engineering business and play a key role in developing its presence across advanced manufacturing and UK defence, while remaining closely connected to engineering and manufacturing. This is not a traditional sales role. Your technical credibility is at the heart of the position. You'll work with customers to understand requirements, review drawings and specifications, develop manufacturing solutions and support projects from initial enquiry through to delivery. Internally, you'll work closely with engineering, production and purchasing teams to ensure solutions...

Principal Engineer Advanced Manufacturing & Defence Up to £70,000 Location: Dorking, Surrey Engineering expertise meets customer engagement, innovation and growth. Are you an experienced engineer who enjoys solving complex manufacturing challenges, working directly with customers and turning technical problems into practical solutions? This is a rare opportunity to join a growing specialist engineering business and play a key role in developing its presence across advanced manufacturing and UK defence, while remaining closely connected to engineering and manufacturing. This is not a traditional sales role. Your technical credibility is at the heart of the position. You'll work with customers to understand requirements, review drawings and specifications, develop manufacturing solutions and support projects from initial enquiry through to delivery. Internally, you'll work closely with engineering, production and purchasing teams to ensure solutions are...

At Amentum, we're not just solving problems; we're engineering the future. Our team is driven by an unyielding commitment to innovation, integrity, and collaboration, tackling some of the most significant challenges in science, security, and sustainability. If you're passionate about making a real impact and want to be part of a community that values ethical excellence, this is the place where your ambition can thrive. Here, we believe that success comes from continuously pushing boundaries and working together to deliver on our promises. We embrace challenges with confidence and are dedicated to creating a secure and vibrant future for all. We'll inspire and empower you to deliver your best work so you can evolve, grow and succeed - today and into tomorrow. We offer an exciting range of opportunities to develop your career within a supportive team who always strive to do the right thing for our people, clients and communities. Work-life balance and flexibility is a key focus...

Lead electrical design for UK water infrastructure - Principal Electrical Design Engineer (Water) Purpose and scope of the role: Tetra Tech's Water Consultancy is seeking multiple Principal Electrical Design Engineers to lead technical delivery across major long-term water industry frameworks UK-wide. You will produce, review and approve intricate electrical designs, specifications, calculations and construction documentation for process plants, pumping stations and ancillary assets. Daily activities include design leadership, multidisciplinary coordination, client engagement and oversight of digital design workflows. Projects include a £100 million, 10-year United Utilities framework and a broad AMP8/AMP9 portfolio comprising multi-million-pound capital schemes. You will provide technical assurance and mentor teams of engineers, modellers and data analysts. Your impact in this position: In the short term you will assure technical quality and deliverable...

Principal Structural Engineer Building Engineering Milton Keynes Shape the Future of Residential and Public Infrastructure This is an excellent opportunity for a highly capable and collaborative structural engineer to take a leading technical role within our Building Engineering team. As a Principal Structural Engineer, you will be at the forefront of delivering multidisciplinary building projects across residential, public sector, and commercial developments. This role is ideal for someone who combines strong technical expertise with a passion for mentoring others, influencing project outcomes, and contributing to innovative, sustainable engineering solutions. You will play a key role in shaping the future of engineering delivery at Tetra Tech. Purpose and Scope of the Role You will join the Building Engineering team in Milton Keynes, where you will lead both new-build structural design and the structural investigation, assessment, and reporting of...

Principal Protection & Control (P&C) Design Engineer - UK Grid Network Jacobs is playing a leading role in the global energy transition. As our UK and Continental Europe team continues to expand, we are seeking a Principal Protection & Control Engineer to support a range of high-profile projects across our Power & Energy portfolio. This includes high voltage AIS and GIS Substations, transmission system assets, HVDC interconnectors, and energy storage systems. Key Responsibilities: Lead FEED and detailed design workstreams for Protection & Control systems across transmission and renewable energy projects Develop and review interface designs, protection schemes, and control philosophies Ensure quality assurance and timely delivery of design packages and technical bids Undertake site visits and non-intrusive surveys as part of design or site support activities Review protection settings, relay coordination, and scheme logic Coordinate with back-office...

Join Tetra Tech's expanding Fire Safety team and apply cutting-edge engineering to projects that protect people and infrastructure. If you're a meticulous, proactive fire safety engineer who thrives in technical, multidisciplinary teams and wants meaningful career progression, this role is for you. Purpose & Scope of the Role As Senior/Principal Fire Safety Engineer you will deliver fire engineering services across public and private sector projects in the UK and internationally. You'll apply fire engineering principles to building design, undertake technical delivery and compliance checks (Approved Document B, BS 9999 and fire engineering approaches), review designs and drawings, attend site and design-team meetings, and contribute to winning and delivering projects with a fire safety component. Your Impact in this position You will shape safe, pragmatic fire solutions across commercial, residential, education, healthcare and defence sectors. Your technical decisions...

Highways Principal Engineer (UK Wide) This isn't just another engineering role-it's your chance to shape how the UK moves. As a Principal Highways Engineer, you'll lead the design and delivery of major transport projects that connect communities, boost economies, and improve everyday journeys. You'll drive smarter, safer, more efficient design solutions-while mentoring the next generation of engineers and influencing how we deliver projects at scale. From national programmes to local schemes that make a real difference, your expertise will directly elevate performance, innovation, and outcomes across our highways capability. About the opportunity We know great people want more than just a job-so here's what you can expect: Real influence - Lead high-profile projects and shape technical decisions that matter Variety & impact - Work on everything from local authority schemes to global mega-projects Career growth - Opportunities to step into leadership, grow...

Principal Drainage Engineer - Multiple Locations In this role, your expertise will directly shape some of the UK's most high-profile transportation programmes. By stepping into a Principal Engineer position, you'll influence the technical direction of major highway and rail schemes for clients such as National Highways, Transport Scotland, Network Rail, the Welsh Government, HS2 Ltd, national contractors, and local authorities. Your leadership will strengthen a team already recognised for excellence, helping expand our growing portfolio across the UK. As the technical discipline lead, you'll set the standard for drainage engineering on multi-disciplinary projects-guiding design quality, challenging assumptions, and driving innovative, sustainable solutions. Your knowledge of key drainage tools, DMRB or UK Rail Standards, SuDS design, and engagement with Lead Local Flood Authorities will directly shape project outcomes. You'll also play a pivotal role in developing others,...

Location - flexible Help shape safer, compliant buildings at project-critical level. Join us as a Principal Designer Building Regulations Consultant and bring your technical expertise to complex, high-value developments. Purpose and Scope of the Role This role is focused on delivering Principal Designer services under the Building Regulations for medium to large projects. Reporting to the PDBR Lead, you will provide technical oversight across the design phase, ensuring statutory compliance, robust design coordination and effective regulatory risk management. You will work closely with clients, contractors, Registered Building Control Approvers, local authorities and multidisciplinary design teams. While a sound understanding of CDM 2015 is important, the primary focus is on Building Regulations compliance , design review and supporting delivery within the Building Safety Act framework. Your impact in this position You will play a key role in helping...

Principal Engineer Overhead Lines (OHL) Jacobs is playing a leading role in the global energy transition. As our UK and Continental Europe team continues to expand, we are seeking a Principal Engineer - OHL to support a range of high-profile projects across our Power & Energy portfolio. This includes high voltage AIS and GIS Substations, transmission system assets, HV Overhead Lines, HVDC interconnectors, and energy storage systems. Main responsibilities include (but are not limited to): Develop detailed engineering drawings, specifications, and design documentation using software tools such as PLS-CADD, AutoCAD and Microstation Overseeing technical activities, line routing, sag-tension calculations, structure analysis, conductor selection, clearance reports, and design documentation Preparing and reviewing proposals and reports detailing project scope, timelines, budgets, and resource allocations Regularly engaging in client-facing design reviews and technical...

Principal Engineer, Bridges & Structures - UK Wide Your engineering judgement will shape structural solutions across some of the UK's most important transport and infrastructure programmes. You will help clients solve complex challenges involving existing and new structures across highways, rail, aviation, energy and power. Whether improving the performance of an ageing asset, developing a renewal strategy or leading a technically demanding design, your work will directly influence safety, sustainability, whole-life value and project delivery. You will bring clarity to difficult engineering decisions and provide technical leadership to multidisciplinary teams. You will also help develop the engineers around you, giving them the confidence, support and challenge needed to progress. This is an opportunity to combine deep technical expertise with wider influence. You will improve how structural solutions are developed and delivered by applying digital tools, leaner...