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Principal United Kingdom Jobs (Hybrid work)

348 Job Offers

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Principal – Environmental Impact Assessment (EIA) & Consents
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Lead EIA and consenting projects across T&D, energy, water and transport at Egis in Manchester. Hybrid role requiring UK planning policy knowledge and environmental consultancy experience.
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Egis Group
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New
Principal – Environmental Impact Assessment (EIA) & Consents
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Egis seeks a Principal for EIA & Consents in London, Manchester or Bristol (hybrid). Lead environmental assessments across T&D, energy and transport projects. Requires EIA experience and UK planning knowledge.
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Egis Group
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CS&A Principal Engineer
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Assystem seeks a CS&A Principal Engineer for the Box Encapsulation Plant at Sellafield, Cumbria. Requires chartered status (CEng MICE/MIStructE), nuclear sector experience, and proven engineering leadership. Lead design assurance and site teams on this critical nuclear project.
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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 Warrington to lead nuclear, defence and infrastructure projects. Requires 10+ years in EC&I design, team leadership and regulated industry expertise. Apply now!
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ASSYSTEM
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Principal Success Architect - AI Control Tower
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Lead enterprise AI adoption as a Principal Success Architect in London. Guide customers through AI Control Tower implementation, EU AI Act compliance, and governance frameworks. Requires 5+ years in GRC or AI governance with strong advisory skills.
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Armis
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Principal Engineer (Telecoms)
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Lead telecoms design on major rail infrastructure projects as Principal Engineer. Act as CRE, mentor engineering teams and ensure Network Rail compliance. Hybrid role in York or Cumbernauld with car allowance and strong benefits.
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Location
United Kingdom, York, Cumbernauld
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AmcoGiffen
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Product Manager, New Product Bet (Principal-level)
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Synthesia seeks a Principal Product Manager in London to own Surveys and Guidance for a new agentic, real-time AI product bet. Requires zero-to-one experience, strong strategy skills, and commercial impact focus.
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Synthesia
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Principal Data Engineer
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Lead the Future State Data Platform strategy at Funding Circle in London. Requires 10+ years in Data Engineering and deep Snowflake, AWS, dbt and Airflow expertise. Enjoy flexible benefits and share schemes.
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Funding Circle
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Principal Nuclear Security Engineer
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Assystem seeks a Principal Nuclear Security Engineer in Glasgow to provide engineering assurance for security-related nuclear assets. Requires high-hazard regulated experience, SyAPs knowledge, and security case expertise.
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ASSYSTEM
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Principal Java Engineer
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Lead Java development at a modern software house in Manchester. Drive Agile delivery, build features with Spring Boot, AWS and Kubernetes, and mentor your team. Bonus included.
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70000.00 - 80000.00 GBP / Year
Burns Sheehan
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Principal Engineer
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Motorway seeks a Principal Engineer in London to set technical strategy across product areas. Requires 10+ years in software engineering, deep AWS expertise, and strong API/identity architecture skills. Hybrid role with stock options.
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Motorway
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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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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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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.