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Principal United Kingdom, London Jobs

187 Job Offers

Principal Client Partner
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Tripadvisor
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Principal Product Data Scientist
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Lead product data science strategy in London, driving AI and experimentation to shape customer experiences. This Principal role requires expert Python/SQL skills, deep statistical modeling, and a track record of influencing product roadmaps. You will champion causal inference, machine learning, a...
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Tripadvisor
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Principal Product Data Scientist
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Principal Product Data Scientist role in London: Lead technical strategy for product data science, driving AI and experimentation innovation. Expert-level Python, SQL, and machine learning required. Shape product vision, influence senior leadership, and integrate emerging AI technologies. Ideal f...
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Tripadvisor
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Principal Designer, TIDAL
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Principal Designer at TIDAL: Lead product vision and design strategy for a music-tech brand shaping culture. This remote London role demands 8+ years of experience, systems thinking, and AI fluency. Drive high-impact initiatives, mentor teams, and define design excellence. Join a nimble team buil...
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Block
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Principal Designer for CDM and Building Regulations
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Principal Designer sought for a 50/50 CDM and Building Regulations role in London. Join a multidisciplinary consultancy, managing risk on large-scale Commercial, Healthcare, and complex Residential projects. Requires 5+ years in Architectural or CDM Principal Design, with APS or ARB certification...
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70000.00 - 80000.00 GBP / Year
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Brandon James
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Civil Engineer - Water / Wastewater (Senior / Principal)
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Lead national water and wastewater infrastructure projects as a Senior/Principal Civil Engineer at Egis in London. Drive major UK programmes like AMP8, leveraging your CEng status and expertise in Civil 3D and hydraulic modelling. This senior role offers hybrid working, accelerated career progres...
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Egis in the UK
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Principal Software Engineer
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Principal Software Engineer sought for a high-impact role in London, UK, focusing on Workload Identity. You will design and develop secure communication solutions using Golang, Kubernetes, and cloud technologies. This position requires deep expertise in security, networking, and enterprise-scale ...
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Palo Alto Networks
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Principal Power Systems Engineer
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Principal Power Systems Engineer role at NTT Data, supporting UK & Ireland Critical National Infrastructure. Lead network design and modelling for DNOs/TSOs, specializing in Load Flow, Fault Level, and G99 compliance. Requires Master’s/PhD in Power Systems, 10+ years’ experience, and expertise in...
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NTT DATA
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Principal IT Pillar Specialist
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Principal IT Pillar Specialist and AVEVA E3D Administrator sought for a key role in Chiswick, London. Leverage 10+ years of expertise in PML and .NET to configure, customize, and automate complex engineering systems. Drive best practices and lead projects independently within a global IT framewor...
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McDermott
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Principal Building Automation Engineer
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Cundall seeks a Principal Building Automation Engineer to lead BMS, DDC, SCADA, and PLC design across UK offices (Birmingham, Bristol, Edinburgh, London, Manchester, Newcastle). You will collaborate with multidisciplinary teams on innovative controls for mechanical plant and electrical monitoring...
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United Kingdom, Birmingham, Bristol, Edinburgh, London, Manchester, Newcastle
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Cundall
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Principal Product Data Scientist
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Lead product data science strategy in London, driving AI and experimentation to shape customer experiences. Expert-level Python, SQL, and machine learning skills required. Act as a strategic advisor to senior leadership, championing causal inference and next-gen tooling. Ideal for candidates with...
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Tripadvisor
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Principal Product Data Scientist
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Tripadvisor seeks a Principal Product Data Scientist in London to lead data science strategy, driving product innovation with advanced analytics and AI. You’ll leverage expert Python, SQL, and machine learning skills to influence senior leadership and embed data-driven decisions. This role offers...
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Tripadvisor
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Principal Technical Program Manager - Forward Deployed Engineering
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Lead complex technical programs as a Principal TPM on Microsoft's Forward Deployed Engineering team in London. Embed with strategic customers to co-engineer AI-powered, cloud-based solutions, driving measurable business outcomes with high autonomy. Requires cross-functional project management exp...
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91800.00 - 154700.00 GBP / Year
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Microsoft Corporation
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Cdm Principal Designer
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Join a leading Construction Consultancy as a CDM Principal Designer in scenic London. Leverage your 3+ years of CDM experience and NEBOSH Construction qualification to deliver Design Risk Management with minimal site visits. Enjoy up to £55,000, a car allowance, free barista coffee, and exception...
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50000.00 - 55000.00 GBP / Year
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Brandon James
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Principal Consultant in Product Lifecycle Management - Aerospace & Defence
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Principal Consultant in PLM for Aerospace & Defence. Lead digital engineering transformations across the product lifecycle. Requires 10+ years’ PLM expertise, deep BOM/change management skills, and consulting experience. Based in Manchester, Bristol, or London with benefits including private heal...
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United Kingdom, Manchester, Bristol, London
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PA Consulting
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Azure Principal Platform Engineer
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As an Azure Principal Platform Engineer, you will architect and build a greenfield, multi-tenant AKS platform for a major fintech. This role requires deep expertise in Kubernetes platform engineering, security (CAF/ALZ), and FinOps. You will establish the platform operating model and mentor the i...
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United Kingdom, Greater London, England, Spain
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Parser Limited
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Principal Machine Learning Scientist
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Lead ML strategy as Principal Machine Learning Scientist in London, driving Tripadvisor’s core discovery engine. You’ll architect large-scale ranking & recommendation systems, leveraging deep multi-task learning and sequential modeling. Ideal for experts with 8+ years in production ML, a PhD/MSc,...
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Tripadvisor
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Principal Structural Engineer
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Principal Structural Engineer sought for a UK-based role with a global sustainable design consultancy. Lead complex projects across industrial, tech, and defence sectors, including data centres and gigafactories. Requires Chartered status (IStructE/ICE), SC clearance eligibility, and expertise in...
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500.00 - 600.00 GBP / Day
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Morson Talent
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Principal C++ Engineer
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Principal C++ Engineer sought for a front-office options desk in London, building a brand-new trading stack. You will leverage deep C++ and Linux expertise, including multi-threaded programming, to design and implement bespoke automated trading software. This role demands strong engineering princ...
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180000.00 - 200000.00 GBP / Year
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Harrington Starr
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Principal Value Advisor, DACH
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Lead strategic value engagements as a Principal Value Advisor for Atlassian in the DACH region. Drive innovation, build executive relationships, and articulate complex business cases for C-level stakeholders. Requires deep expertise in value management, financial modeling, and fluent English. Bas...
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The Muse
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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.