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Principal United Kingdom Jobs (Hybrid work)

348 Job Offers

Principal Optical Scientist
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Join Microsoft Research in Cambridge, UK as a Principal Optical Scientist to shape next-gen AI infrastructure. You will lead high-risk optical system design, modelling, and simulation using Zemax and Python, bridging research with production. This role requires a Doctorate in Optics or equivalent...
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Microsoft Corporation
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Until further notice
Interim Principal Accountant
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Seeking an experienced **Interim Principal Accountant** for a senior role in London, UK. You will drive **budgeting and planning** within a local government organisation, producing critical budget reports and managing allocations. Collaborate with the Strategy and Planning team to align financial...
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Allen Lane
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Until further notice
Cdm Principal Designer – Architect
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ARB/RIBA Architect sought for a unique CDM Principal Designer role with a leading multi-disciplinary consultancy in Sheffield. You will lead design risk management across diverse residential, commercial, and healthcare projects. This hybrid position offers a car allowance, generous bonus, and gol...
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45000.00 - 60000.00 GBP / Year
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Brandon James
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Until further notice
Cdm Principal Designer – Architect
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A market-leading consultancy seeks an ARB/RIBA-registered Architect to transition into a CDM Principal Designer role in Liverpool. You will lead design risk management across diverse residential, commercial, and healthcare projects. This hybrid role offers a car allowance, generous bonus, gold-st...
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45000.00 - 60000.00 GBP / Year
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Brandon James
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Until further notice
Principal Optical Packaging Engineer
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Join Microsoft Research in Cambridge, UK as a Principal Optical Packaging Engineer to shape next-gen AI infrastructure. You will lead co-packaged optics (CPO) architecture, advanced 2.5D/3D packaging, and scalable optical assembly. Ideal candidates have a Master’s/PhD in Photonics or EE, deep CPO...
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Microsoft Corporation
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Until further notice
Principal Tech Team Lead (Front End)
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Principal Tech Team Lead (Front End) role in London. Lead and mentor 3-5 Tech Team Leads, scaling React/TypeScript architecture and driving performance, accessibility, and testing standards. Requires deep frontend expertise, coaching skills, and a servant-leadership mindset. Benefits include £85k...
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85000.00 - 125000.00 GBP / Year
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Xelix
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Until further notice
Principal Safety Case Engineer
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Principal Safety Case Engineer role in Warrington, UK, leading nuclear safety projects. You will develop safety case strategies, conduct radiological assessments, and mentor teams. Requires a degree, Chartered status (or working towards), and broad safety case experience. Excellent benefits packa...
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Morson Talent
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Until further notice
Principal Illicit Finance Analyst
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Principal Illicit Finance Analyst sought to lead crypto and illicit finance investigations in London. This role combines advanced OSINT and blockchain tracing to map adversarial networks for governments and platforms. Ideal for an investigative journalist-minded analyst with 3+ years in crypto-en...
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Protection Group International
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Until further notice

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.