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Principal United Kingdom Jobs

590 Job Offers

Senior Principal Mechanical Engineer
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Assystem seeks a Senior Principal Mechanical Engineer in Bolton to lead multidisciplinary teams on fusion and modular nuclear projects. Requires steam cycle modelling, cooling water expertise, and ONR compliance knowledge. Hybrid work with strong benefits.
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ASSYSTEM
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Senior Principal Mechanical Engineer
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Assystem seeks a Senior Principal Mechanical Engineer in Newcastle upon Tyne to lead multidisciplinary teams on fusion and modular nuclear projects. Requires steam cycle modelling, cooling water systems expertise, and ONR compliance knowledge. Hybrid role with strong benefits.
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Location
United Kingdom, Newcastle upon Tyne
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ASSYSTEM
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Senior Principal Mechanical Engineer
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Assystem seeks a Senior Principal Mechanical Engineer in Bristol to lead multidisciplinary teams on fusion and modular nuclear projects. Requires steam cycle modelling, cooling water expertise, and ONR compliance knowledge. Hybrid role with strong benefits.
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ASSYSTEM
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Senior Principal Mechanical Engineer
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Assystem seeks a Senior Principal Mechanical Engineer in Derby to lead multi-disciplinary teams on fusion and modular nuclear projects. Requires steam cycle modelling, cooling water expertise, and ONR compliance. Hybrid role with strong benefits.
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ASSYSTEM
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Principal Stress Engineer
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Lead stress and structural integrity projects on major UK nuclear programmes with Assystem, a top-3 global nuclear engineer. Expert FE analysis, ASME/RCC-M/R6 codes, mentoring and hybrid work across multiple UK sites.
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ASSYSTEM
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Principal Stress Engineer
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Assystem seeks a Principal Stress Engineer to lead structural integrity projects across UK nuclear sites. Requires expert FE analysis, ASME/RCC-M/R6 codes, and team leadership. Hybrid work with strong benefits.
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ASSYSTEM
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Principal Stress Engineer
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Assystem seeks a Principal Stress Engineer in Bristol to lead structural integrity projects for nuclear clients. Requires expert FE analysis, ASME/RCC-M/R6 code knowledge, and team mentoring. Hybrid work with strong benefits.
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ASSYSTEM
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Principal Stress Engineer
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Assystem seeks a Principal Stress Engineer to lead structural integrity projects across UK nuclear sites. Requires expert FE analysis, ASME/RCC-M/R6 codes, and team leadership. Hybrid work with strong benefits.
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Not provided
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ASSYSTEM
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Principal Stress Engineer
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Assystem seeks a Principal Stress Engineer to lead structural integrity projects across UK nuclear sites. Requires expert FE analysis, ASME/RCC-M/R6 codes, and team leadership. Hybrid work with strong benefits.
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ASSYSTEM
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Senior / Principal Power Systems Engineer
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AECOM seeks a Senior/Principal Power Systems Engineer in Glasgow to deliver grid connection projects across the UK and Ireland. Requires expertise in PSCAD, PowerFactory, UK Grid Code, and transmission planning.
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AECOM
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Senior / Principal Power Systems Engineer
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AECOM seeks a Senior/Principal Power Systems Engineer in Birmingham to deliver grid connection projects across the UK and Ireland. Requires expertise in PSCAD, PowerFactory, UK Grid Code, and transmission planning.
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AECOM
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Senior / Principal Power Systems Engineer
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AECOM seeks a Senior/Principal Power Systems Engineer in Bristol to deliver grid connection projects across the UK and Ireland. Requires expertise in PSCAD, PowerFactory, UK Grid Code and high voltage systems.
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AECOM
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Senior / Principal Power Systems Engineer
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AECOM seeks a Senior/Principal Power Systems Engineer in London to lead grid compliance studies using PowerFactory, PSCAD and PSS/E. Requires UK Grid Code expertise and strong transmission planning skills.
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AECOM
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Senior / Principal Power Systems Engineer
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AECOM seeks a Senior/Principal Power Systems Engineer in Manchester to deliver grid connection projects across the UK and Ireland. Requires expertise in PSCAD, PowerFactory, UK Grid Code, and transmission planning.
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AECOM
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Senior / Principal Power Systems Engineer
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AECOM seeks a Senior/Principal Power Systems Engineer in Newcastle to deliver grid connection projects across the UK and Ireland. Requires expertise in PSCAD, PowerFactory, UK Grid Code and high voltage systems.
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Location
United Kingdom, Newcastle upon Tyne
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AECOM
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Senior / Principal Power Systems Engineer
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AECOM seeks a Senior/Principal Power Systems Engineer in Leeds to deliver grid connection projects across the UK and Ireland. Requires expertise in PSCAD, PowerFactory, UK Grid Code and HV protection.
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AECOM
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Principal Mechanical Engineer
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Lead mechanical design on major UK water and wastewater projects with Egis in London, Bristol or Manchester. Hybrid working, rapid progression and a high-growth environment await experienced chartered engineers.
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Egis Group
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Principal Flood Risk Consulant
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Lead flood risk projects across the UK with Egis as a Principal Flood Risk Consultant in Bristol. Requires 7+ years' experience, chartered status, and expertise in FRAs, hydraulic modelling, and SuDS.
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Egis Group
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Principal Flood Risk Consulant
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Lead flood risk projects across the UK with Egis as a Principal Flood Risk Consultant. Requires 7+ years' experience, chartered status, and expertise in FRAs, hydraulic modelling, and SuDS. London-based growth role.
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Egis Group
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Principal Wastewater Modeller
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Lead Infoworks ICM wastewater modelling at Egis UK in Bristol. Hybrid role driving SuDS, CSO performance and sustainable infrastructure. Requires 8+ years' experience, scripting skills and mentoring ability.
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Egis Group
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About the Principal role

A Principal role represents a senior leadership position found across various industries, from construction and engineering to technology and product management. Individuals in these jobs are trusted with high-level strategic oversight, complex problem-solving, and driving significant organizational impact. Unlike entry-level or mid-career positions, Principal jobs typically require a deep well of specialized expertise, a proven track record of leadership, and the ability to influence direction without direct managerial authority over every team member.

In a professional context, a Principal is often the highest individual contributor or a senior team lead responsible for shaping the vision and execution of critical initiatives. For example, in design and construction sectors, a Principal Designer focuses on risk management from the earliest stages of a project. They ensure that health and safety regulations, such as the CDM Regulations 2015, are integrated into the design process, mitigating hazards before construction begins. This involves leading cross-functional coordination, conducting design reviews, and ensuring a seamless handover to contractors.

In technology and business strategy, Principal Product Managers own the end-to-end lifecycle of complex service portfolios or product lines. They are responsible for defining strategy, developing business cases, and launching innovative offerings that drive customer adoption and revenue growth. These roles demand a data-driven approach to decision-making, strong cross-functional leadership, and the ability to influence executives and stakeholders across engineering, sales, marketing, and customer success teams. Common responsibilities include market analysis, competitive benchmarking, pricing strategy, and building go-to-market plans.

Typical skills required for Principal jobs include exceptional communication and presentation abilities, strategic thinking, and a high degree of autonomy. Candidates usually possess a bachelor’s or master’s degree in a relevant field, combined with significant experience—often eight or more years in a related domain. Technical proficiency is critical, whether in understanding network security, cloud infrastructure, or construction regulations. Soft skills such as negotiation, mentorship, and the ability to drive alignment in matrixed organizations are equally important.

Ultimately, Principal jobs are about leading from the front, solving the most challenging problems, and setting the standard for excellence within an organization. Whether mitigating risk on a construction site or defining the future of a software platform, these professionals are integral to driving meaningful, lasting results.