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Principal United Kingdom, London Jobs

187 Job Offers

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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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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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. 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 Network Modeller
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Lead Infoworks ICM wastewater modelling at Egis UK in London, Bristol or Manchester (hybrid). Mentor colleagues, champion SuDS and sustainable drainage, and deliver innovative hydraulic modelling projects UK-wide.
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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 London, Bristol or Manchester (hybrid). Shape sustainable drainage and CSO performance with a global leader offering fast progression and top-tier benefits.
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Egis Group
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Principal Electrical Engineer
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Lead electrical/EICA design on UK water and wastewater projects at Egis in London, Bristol or Manchester. Requires chartered status, 7-10+ years' experience and multidisciplinary technical leadership. Hybrid working with fast progression.
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Egis Group
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Principal Urban Drainage Modeller
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Lead Infoworks ICM wastewater modelling at Egis UK in London, Bristol or Manchester (hybrid). Mentor colleagues, champion SuDS and sustainable drainage, and deliver innovative hydraulic modelling projects UK-wide.
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Egis Group
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Principal (Director), Transformation & Value Creation
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Analysys Mason
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Principal (Director), Transformation & Value Creation
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Analysys Mason
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Principal Machine Learning Engineer
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ASOS
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Principal (Director), Commercial Excellence and Pricing
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Analysys Mason
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Principal (Director), Commercial Excellence and Pricing
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Analysys Mason
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Principal Success Architect - AI Control Tower
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Armis
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Principal Civil Engineer
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AFRY
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Principal / Senior Electrical Engineer
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AFRY
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Principal Mechanical Engineer
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AFRY
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Principal – Environmental Impact Assessment (EIA) & Consents
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Egis Group
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Principal Mechanical Engineer - Water / Wastewater
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Egis Group
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Senior Principal Architect, CTO Office
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IFS
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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.