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Principal United Kingdom Jobs (Hybrid work)

348 Job Offers

Principal EC&I Engineer
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Assystem seeks a Principal EC&I Engineer in Warrington to lead nuclear, defence and infrastructure projects. Requires 10+ years in EC&I design, team leadership and a relevant engineering degree.
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ASSYSTEM
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Principal EC&I Engineer
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Assystem seeks a Principal EC&I Engineer in Whitehaven to lead electrical services design in nuclear decommissioning. Requires CDM expertise, cable routing skills, and strong communication. Enjoy top-tier benefits and career growth.
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ASSYSTEM
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Principal Fire Engineer
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AECOM seeks a Principal Fire Engineer in Manchester to lead fire engineering design projects, CFD and evacuation modelling. Requires CEng status, UK regulations expertise, and mentoring skills.
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AECOM
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Principal Fire Engineer
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AECOM seeks a Principal Fire Engineer in London to lead fire engineering design projects, CFD and evacuation modelling. Requires CEng status, UK regulations expertise, and mentoring skills.
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AECOM
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Principal Fire Engineer
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AECOM seeks a Principal Fire Engineer in St Albans to lead fire engineering design projects, CFD and evacuation modelling. Requires CEng status, UK regulations expertise, and mentoring skills.
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AECOM
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Principal Fire Engineer
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AECOM seeks a Principal Fire Engineer in Edinburgh to lead design projects, deliver CFD and evacuation modelling, and mentor junior engineers. Requires Chartered status (CEng) and strong UK fire regulations expertise.
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AECOM
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Principal, Revenue Marketing (International)
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Lead international revenue marketing at Immuta, shaping go-to-market strategy across global B2B SaaS markets. Drive integrated campaigns, AI-powered marketing, and pipeline growth from London.
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138000.00 - 161000.00 GBP / Year
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Immuta
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Principal Mechanical Engineer - Water
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Lead mechanical design on major UK water and wastewater projects with Egis in London, Bristol or Manchester. Hybrid working, AMP8 involvement and fast career progression for a Chartered Engineer with 7-10+ years' experience.
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Egis Group
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Principal Mechanical Engineer - Water
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Lead mechanical design on UK water and wastewater projects with Egis in Manchester. Hybrid role requires Chartered status, 7-10+ years' design experience and proven technical leadership.
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Egis Group
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Principal Process Engineer - Water Sector
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Lead water and wastewater process design at Egis as Principal Process Engineer in Manchester. Requires 8-10+ years' experience, chartered status, and BioWin/SUMO modelling skills. Hybrid role with fast progression.
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Egis Group
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Principal Process Engineer - Water Sector
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Lead water and wastewater process design at Egis as Principal Process Engineer in London, Bristol or Manchester. Requires 8-10+ years' experience, chartership, and BioWin/SUMO modelling skills. Hybrid role with fast progression.
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Egis Group
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Principal Process Engineer - Water Sector
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Lead water and wastewater process design at Egis as Principal Process Engineer in Bristol. Requires 8-10+ years' experience, Chartered status, and BioWin/SUMO modelling skills. Hybrid role with fast progression.
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Egis Group
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Principal Wastewater Modeller
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Lead wastewater modelling projects at Egis UK as Principal Wastewater Modeller in London, Bristol or Manchester (hybrid). Requires 8+ years Infoworks ICM experience, mentoring skills and a passion for sustainable drainage and innovation.
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Egis Group
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Principal EC&I Engineer
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Assystem seeks a Principal EC&I Engineer in Warrington to lead nuclear, defence and infrastructure projects. Requires 10+ years in EC&I design, team leadership and a relevant engineering degree.
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Salary
Not provided
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ASSYSTEM
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Until further notice
Principal EC&I Engineer
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Assystem seeks a Principal EC&I Engineer in Whitehaven to lead electrical services design in nuclear decommissioning. Requires CDM expertise, cable routing skills, and strong communication. Enjoy top-tier benefits and career growth.
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ASSYSTEM
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Principal Consents Consultant (Planning & Consents Lead)
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Lead planning and consenting strategies on major infrastructure programmes in Glasgow. Requires strong UK planning legislation knowledge, stakeholder management skills and experience with regulators. Join Assystem's energy transition mission.
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ASSYSTEM
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Principal Cable System Design Engineer (Transmission & Distribution)
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Lead HV/EHV cable system design projects at AECOM in Glasgow. Requires technical leadership, National Grid TP and IEC standards expertise, and multidisciplinary team coordination. Shape sustainable infrastructure.
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AECOM
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Principal Cable System Design Engineer (Transmission & Distribution)
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Lead HV/EHV cable system design projects at AECOM in Bristol. Requires technical leadership, National Grid TP and IEC standards expertise, and multidisciplinary team coordination. Shape sustainable infrastructure with a global team.
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AECOM
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Principal Cable System Design Engineer (Transmission & Distribution)
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Lead HV/EHV cable system design projects at AECOM in Leeds. Requires technical leadership, National Grid TP and IEC standards expertise, and multidisciplinary team coordination. Shape sustainable infrastructure with a global team.
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AECOM
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Principal Cable System Design Engineer (Transmission & Distribution)
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AECOM seeks a Principal Cable System Design Engineer in Newcastle-Upon-Tyne to lead HV/EHV cable projects from concept to completion. Requires technical leadership, National Grid standards expertise, and multidisciplinary team coordination skills.
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Location
United Kingdom, Newcastle upon Tyne
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AECOM
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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.