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Principal Engineer United Kingdom Jobs

155 Job Offers

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; Spain , Greater London; England; Spain
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Parser Limited
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Principal Embedded Software Engineer
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Principal Embedded Software Engineer sought in Bristol, UK. Lead and mentor engineering teams in safety-critical embedded development using C, Assembler, and RTOS. Oversee the full software lifecycle, manage projects, and drive innovation. Enjoy a collaborative environment with a bonus.
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United Kingdom , Bristol
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Salary
80000.00 GBP / Year
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Zenovo
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Principal Electronics Design Engineer
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Principal Electronics Design Engineer sought to lead hardware development in Cheshire, UK. You will define electronics architecture, drive analogue/digital design from concept to production, and own PCB quality. Requires a degree in Electronics Engineering, strong experience in product developmen...
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United Kingdom , Cheshire
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85000.00 GBP / Year
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Zenovo
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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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United Kingdom , London
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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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United Kingdom , London
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180000.00 - 200000.00 GBP / Year
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Harrington Starr
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Principal Mechanical Design Engineer
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Principal Mechanical Design Engineer sought for Blackburn, London, and Glasgow offices. You will lead designs for district heating, energy centres, and heat pumps. Requires 6+ years in mechanical design for power or building services, plus AutoCAD proficiency. Benefits include car allowance, pens...
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United Kingdom , Blackburn
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Not provided
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Vital Energi Utilities Limited
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Principal Mechanical Design Engineer
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Principal Mechanical Design Engineer sought for Glasgow, London, and Blackburn. You will lead the design of district heating, energy centres, and trigeneration solutions. Requires 6+ years in mechanical design for power, renewables, or building services, plus AutoCAD proficiency. Benefits include...
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United Kingdom , Glasgow
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Not provided
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Vital Energi Utilities Limited
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Senior / Principal Civil Water Engineer
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Senior / Principal Civil Water Engineer sought to lead multi-disciplinary teams on landmark UK water infrastructure projects in Bristol. You will drive technical design for hydraulics, wastewater, and clean water systems, mentoring junior engineers. Enjoy flexible hybrid working, a competitive sa...
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United Kingdom , Bristol
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Not provided
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Morson Talent
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Principal Engineer - CPTO, BPL
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Principal Engineer role in CPTO, BPL, shaping scalable distributed services for critical business operations. Requires deep JVM expertise (Kotlin, Java), cloud-native mindset (AWS, Azure, GCP), and fintech/payments experience. Based in London or Northampton, UK, with benefits including private me...
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United Kingdom , London; Northampton
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Not provided
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Barclays
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Principal Safety Engineer
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Principal Safety Engineer sought for Bolt’s Autonomous Driving team in London. You will lead safety cases for Level 4 systems, mastering ISO 26262, SOTIF, and cybersecurity standards. Requires 10+ years in safety-critical engineering and deep knowledge of autonomous architecture. Enjoy a hybrid r...
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United Kingdom , London
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Not provided
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Bolt
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Principal Software Engineer
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Principal Software Engineer sought by Microsoft’s ISE team in London to co-engineer high-scale solutions with customers. You will lead technical strategy, containerize workloads, and leverage AI to solve complex challenges. Requires deep coding expertise (C++, Python, etc.) and customer-facing ex...
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United Kingdom , London
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Not provided
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Microsoft Corporation
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Principal Software Engineer
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Principal Software Engineer sought by Mastercard to lead DevOps automation across on-prem and cloud infrastructure. Leverage Terraform, Ansible, Chef, and Kubernetes to build CI/CD pipelines and drive Infrastructure as Code. Requires 10+ years’ experience, strong Linux skills, and cloud expertise...
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United Kingdom , London
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Not provided
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Mastercard
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Principal Opto-Electronics Engineer
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Principal Opto-Electronics Engineer at Microsoft Research in Cambridge, UK. Drive high-risk, high-reward AI infrastructure programs, co-designing next-gen optical transceivers and connectivity systems. Requires a PhD, expertise in analog/mixed-signal CMOS circuits, signal processing, and end-to-e...
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United Kingdom , Cambridge
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Not provided
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Microsoft Corporation
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Principal Embedded Software Engineer
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Principal Embedded Software Engineer sought for maritime defence projects at TKMS Atlas in Winfrith Newburgh, UK. This senior hands-on role involves leading embedded C/C++ development for underwater vehicle control systems and sonar equipment. You will define engineering processes, guide teams, a...
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United Kingdom , Winfrith Newburgh
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Morson Talent
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Principal Electrical Critical Systems Engineer
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Principal Electrical Critical Systems Engineer sought by a top-ranked, partner-owned consultancy in London. Join our award-winning Data Centre team, delivering low-carbon, resilient engineering solutions. You need a degree in Electrical Engineering, consulting experience, and a drive to excel in ...
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United Kingdom , London
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Cundall
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Principal Structural Engineer
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Principal Structural Engineer sought for a Birmingham-based role leading prestigious UK and international projects. This client-focused position requires a Chartered Engineer (CEng) with significant design experience in a multi-disciplinary consultancy. You will drive business development, manage...
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United Kingdom , Birmingham
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Not provided
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Cundall
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Principal AI Software Engineer, Senior Vice President
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Principal AI Software Engineer, SVP role in London. Architect scalable backend systems for advanced AI tools, leveraging expert Python, FastAPI, and Generative AI frameworks like LangChain. Requires deep ML knowledge and full lifecycle ownership. C++ expertise is a bonus. Benefits include 27+ day...
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United Kingdom , London
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Not provided
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Citi
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Principal Sales Engineer
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Seeking a Principal Sales Engineer in London to join Seismic’s AI-powered enablement platform. You’ll partner with sales teams, delivering agentic AI demonstrations and driving enterprise SaaS opportunities within Financial Services. Requires 8+ years presales experience, fluency in AI governance...
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United Kingdom , London
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Not provided
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Seismic
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Principal Electrical Engineer
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Principal Electrical Engineer sought for Egis Transport Solutions in London. Lead rail station electrical design, manage a team, and ensure project delivery. Requires a degree, chartered status, and deep knowledge of Network Rail, HS2, and TfL standards. Join a dynamic team driving innovation in ...
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United Kingdom , London
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Not provided
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Egis in the UK
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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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United Kingdom , Cambridge
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Not provided
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Microsoft Corporation
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Until further notice
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About the Principal Engineer role

Explore the pinnacle of technical leadership with Principal Engineer jobs. A Principal Engineer is a master-level technical expert and strategic leader within an engineering organization. This is not merely a senior role; it represents the apex of an individual contributor technical track, where influence, architectural vision, and deep expertise converge to shape the technological future of a company. Professionals in these roles are the go-to authorities for the most complex, high-impact challenges, setting technical standards and driving innovation across multiple teams or the entire organization.

The common responsibilities of a Principal Engineer are vast and critical to long-term success. Typically, they involve defining and driving the long-term technical strategy and architectural vision for major platforms or product suites. They are responsible for researching, prototyping, and selecting technologies that will scale to meet future business needs. A core part of their duties includes leading the design and implementation of complex, cross-functional systems, ensuring they are resilient, secure, and efficient. They serve as the ultimate escalation point for critical production issues, conducting deep-dive analysis and root cause investigations to resolve systemic problems. Furthermore, Principal Engineers have a significant mentorship and governance function, actively coaching senior and staff engineers, establishing best practices, and conducting rigorous code and design reviews to maintain exceptional quality across all engineering outputs. They are also key collaborators, working closely with engineering managers, product leaders, and enterprise architects to align technical execution with business objectives.

The typical skills and requirements for these high-level positions are extensive. A bachelor's or master's degree in computer science, engineering, or a related field is common, though equivalent demonstrable experience is often acceptable. Most roles require a minimum of 10+ years of progressive, hands-on software development or infrastructure engineering experience, with a significant portion spent in lead or architecture-focused positions. Essential technical skills include mastery of relevant programming languages and frameworks, profound knowledge of system design patterns and distributed architectures, and expertise in cloud platforms like AWS, Azure, or GCP. They must possess exceptional analytical and problem-solving abilities to deconstruct ambiguous, complex problems. Beyond technical prowess, superior soft skills are non-negotiable; this includes outstanding communication to articulate technical vision to both technical and non-technical stakeholders, proven leadership and influence without formal authority, and strategic business acumen. For those seeking to define technological frontiers and mentor the next generation of experts, Principal Engineer jobs offer a challenging and highly rewarding career path at the forefront of innovation.