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Principal United Kingdom Jobs

590 Job Offers

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Principal Infrastructure Engineer
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Flo seeks a Principal Infrastructure Engineer in London to architect EKS at scale, shape PostgreSQL, DynamoDB and Kafka patterns, and build golden paths. Requires deep Kubernetes, AWS and Terraform expertise.
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Flo Health
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Principal Product Security Engineer
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Lead product security strategy at Chainguard, a fast-growing open source security leader. Requires 10+ years in product/application security, cloud-native expertise, and secure SDLC ownership. Remote-first with equity and strong benefits.
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Chainguard
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Principal Regulatory Advisor - Non-Food
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Lead regulatory compliance for consumer goods as Principal Regulatory Advisor - Non-Food at SGS. Home-based role requiring UK/EU legislation expertise and retailer policy experience. Competitive salary plus benefits.
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SGS
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Principal Regulatory Advisor - Non-Food
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Lead regulatory compliance for non-food consumer products at SGS as Principal Regulatory Advisor. Home-based role requiring UK/EU legislation expertise and retailer policy experience. Competitive salary plus benefits.
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SGS
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Industry GTM Lead/ Industry Principal - Construction & Engineering
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Lead GTM strategy for Construction & Engineering at IFS in London. Drive near-term revenue, align sales teams, and champion customers with AI-powered enterprise software. Requires deep industry and technical expertise.
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IFS
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Principal Process Engineer - Water
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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 Electrical Engineer - Water
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Lead electrical/EICA design on major UK water projects with Egis in Manchester. Requires chartered status, 7-10+ years' water sector experience and multidisciplinary leadership skills. Hybrid working with fast progression.
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Egis Group
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Principal Process Engineer - Water
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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 Flood Risk Consultant
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Lead flood risk projects across the UK with Egis as Principal Flood Risk Consultant in Manchester. Requires 7+ years' experience, chartered status, and expertise in FRAs and hydraulic modelling.
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Egis Group
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Principal Network Modeller
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Lead Infoworks ICM network modelling at Egis in London, Bristol or Manchester (hybrid). Shape sustainable water infrastructure, mentor colleagues and deliver UK-wide projects. 8+ years' experience required.
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Egis Group
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Principal Wastewater Modeller
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Lead wastewater modelling projects at Egis as Principal Wastewater Modeller in Bristol. Requires 8+ years Infoworks ICM experience, hydraulic modelling expertise, and mentoring skills. Hybrid role with fast progression and UK-wide impact.
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Egis Group
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Principal Machine Learning Engineer
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ASOS seeks a Principal Machine Learning Engineer in London to lead AI-powered fashion discovery within the Search & Discovery team. Requires extensive experience building large-scale ML systems, owning technical architecture, and a product-focused mindset.
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ASOS
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CS&A Principal Engineer
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Lead CS&A design and site engineering for a major nuclear JV in Warrington. Oversee structural design reviews, TQ/PP submissions and as-built documentation, with regular Sellafield site visits.
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ASSYSTEM
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Senior / Principal Civil Engineers
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Aqua Consultants seeks Senior/Principal Civil Engineers for hybrid roles in water and environment sectors. Lead multidisciplinary projects, manage teams, and drive innovation. Requires chartered status and wastewater expertise.
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Adler & Allan
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Senior / Principal Process Engineers (Clean Water)
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Senior/Principal Process Engineer for UK water projects. Lead process design, mass balances and site optimisation across water and wastewater schemes. Remote role requiring client management and multi-disciplinary teamwork.
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Adler & Allan
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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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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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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.