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Principal United Kingdom Jobs

592 Job Offers

Principal Engineer - Mobile
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Principal Engineer - Mobile role in Glasgow, UK, leading engineering across native mobile apps and identity platforms for corporate banking. You'll architect mobile authentication and signing journeys, ensuring PSD2, SCA, and GDPR compliance. Drive CIAM migration, set engineering standards, and p...
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Barclays
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Principal Technical Program Manager - FDE - Security Check (SC) Clearance
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Lead complex technical programs for UK Defense & Intelligence as a Principal TPM at Microsoft. This London-based role requires SC Clearance and blends AI, cloud, and data engineering to deliver production-ready solutions. You will embed with strategic customers, driving end-to-end outcomes with h...
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93500.00 - 161800.00 GBP / Year
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Microsoft Corporation
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Principal Product Manager - Payments
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Principal Product Manager - Payments role in London, UK. Lead B2B card programs and payment rails at Medius, a global spend management leader. Requires 7+ years in SaaS/fintech with deep expertise in virtual/commercial cards and US/UK/EU payment systems. Drive innovation in AP automation with com...
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Medius
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Principal Design Engineer - Bridges
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Lead the design of bridges and highway structures as Principal Design Engineer at M Group Highways in Peterborough. You’ll manage a team, prepare concept designs, and ensure technical compliance with Eurocodes and National Highways standards. Requires a Civil Engineering degree, Chartership, and ...
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United Kingdom, Fengate, Peterborough
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Social Value Portal Ltd
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Senior Principal Designer
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Senior Principal Designer sought for a Leeds-based consultancy role within Property & Construction. You will lead CDM 2015 compliance, design risk management, and client advisory across diverse projects. Requires NEBOSH, IOSH membership, and consultancy experience. Benefits include £65,000 salary...
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65000.00 - 75000.00 GBP / Year
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Carriera Limited
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Principal QHSES Assurance Specialist
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Seeking a Principal QHSES Assurance Specialist in London to lead risk-based assurance programs for major Oil & Gas EPC projects. This senior role demands 12-15 years’ experience, ISO 9001/14001/45001 Lead Auditor certification, and deep knowledge of IOGP OMS. You will provide independent opinions...
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McDermott
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Principal Thermal Mechanical Engineer
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Principal Thermal Mechanical Engineer sought for a 6-month contract at BAE Systems in Cowes (3-4 days on-site). Leverage expertise in heat transfer, fluid mechanics, and thermodynamics to design and validate thermal systems for naval radar. Lead peer reviews, mentor engineering teams, and optimis...
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51.86 - 70.00 GBP / Hour
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Outsource UK
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Principal Consultant, Health Economics & Modelling
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Principal Consultant, Health Economics & Modelling role in the UK. Leverage 10-15+ years of expertise in HTA submissions (NICE, CADTH) and advanced modelling (Excel/VBA, R). Drive business development, lead complex global projects, and mentor junior staff. Enjoy flexible remote work, career growt...
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Parexel
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Principal Delivery Manager
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Principal Delivery Manager sought to lead complex public sector engagements across the UK. You will drive digital transformation, build trusted advisor relationships, and coach high-performing teams. Requires deep public sector experience, bid leadership, and a user-centric approach. Benefits inc...
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Location
United Kingdom, Any UK Office Hub (Bristol / London / Manchester / Swansea)
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80000.00 - 100000.00 GBP / Year
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Made Tech
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Principal Consultant – Healthcare Operational & Financial Improvement
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Principal Consultant role driving operational and financial improvement across UK healthcare. Lead large-scale NHS transformation, Cost Improvement Programmes, and system-wide change. Requires deep NHS expertise, consulting delivery experience, and accountability for measurable outcomes. Hybrid w...
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PA Consulting
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Senior Principal Mechanical Engineer
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Senior Principal Mechanical Engineer sought to lead the Cooling Water Island team for a groundbreaking Small Modular Reactor (SMR) program in Warrington, UK. Drive FEED to detailed design, manage multidisciplinary teams, and ensure regulatory compliance with ONR and HSE standards. This role offer...
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ASSYSTEM
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Senior Principal Mechanical Engineer
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Senior Principal Mechanical Engineer sought by Assystem to lead cutting-edge fusion and modular nuclear projects in Bolton, UK. You will drive design of critical systems like airlocks and penetrations, leveraging expertise in steam cycle modelling, cooling water equipment, and regulatory complian...
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ASSYSTEM
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Senior Principal Mechanical Engineer
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Senior Principal Mechanical Engineer sought to lead the Cooling Water Island team for a groundbreaking Small Modular Reactor (SMR) program in Derby, UK. Drive FEED to detailed design, manage multidisciplinary teams, and ensure regulatory compliance (ONR, HSE). Leverage expertise in steam cycle mo...
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ASSYSTEM
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Principal Technical Program Management Specialist
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Join Microsoft Research in Cambridge, UK as a Principal Technical Program Management Specialist. Drive high-risk, high-reward AI infrastructure programs, translating early-stage research into scalable cloud solutions. You’ll bridge optics, photonics, and AI system design, managing cross-functiona...
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91800.00 - 154700.00 GBP / Year
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Microsoft Corporation
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Principal Electrical Engineer
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Principal Electrical Engineer sought by Egis Transport Solutions to lead rail station electrical design in London. You will manage a team, deliver full lifecycle designs, and ensure compliance with Network Rail, HS2, and TfL standards. Requires a degree, chartered status, and expertise in Trimble...
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Egis in the UK
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Associate Principal, Customer Success
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As an Associate Principal of Customer Success in London, you will own strategic relationships with C-suite leaders across high-ARR life sciences accounts. Leveraging 7+ years of B2B SaaS experience, you will drive retention, renewal, and growth within the pharmaceutical and biotech sectors. This ...
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360 Resourcing Solutions
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Principal Embedded Software Engineer
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Principal Embedded Software Engineer sought to lead architecture, technical delivery, and strategy for advanced embedded systems in the UK. This senior, hands-on role demands expertise in C/C++, real-time OS (FreeRTOS), and electrical power systems. You will own complex projects, drive Agile proc...
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Salary
75000.00 GBP / Year
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Zenovo
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Principal Mechanical Critical Systems Engineer
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Principal Mechanical Critical Systems Engineer sought for a top-tier data centre consultancy in London. Join a multi-disciplinary team delivering low-carbon HVAC, chilled water, and BMS designs. Ideal for a Chartered engineer with mechanical design experience, ready to lead complex projects for a...
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Cundall
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Principal Mechanical Engineer
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Seeking a Principal Mechanical Engineer for BAE Systems' next-gen Radar Programme. Based in Cowes or Great Baddow, this contract role offers £70/hr (Umbrella, inside IR35). Requires expertise in composite structures, FEA, and mechanical systems design. Lead a small team, provide technical directi...
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Salary
51.86 - 70.00 GBP / Hour
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Morson Talent
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Principal EC&I Engineer
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Principal EC&I Engineer sought for Warrington-based nuclear projects. You’ll provide intelligent customer oversight from design to commissioning, ensuring compliance with technical and safety standards. Requires strong PLC/SCADA expertise, NEC3 experience, and a relevant engineering degree. Join ...
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Morson Talent
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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.