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Principal Engineer United Kingdom Jobs

299 Job Offers

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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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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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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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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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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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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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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Location
United Kingdom, Winfrith Newburgh
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Not provided
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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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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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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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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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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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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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Microsoft Corporation
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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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Principal Opto-Electronics Device Engineer
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Join Microsoft Research in Cambridge, UK as a Principal Opto-Electronics Device Engineer. You will design and optimize high-speed photonics devices for next-gen AI infrastructure, using tools like COMSOL and Lumerical. This role requires a PhD in a relevant field, expertise in semiconductor physi...
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Microsoft Corporation
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Principal Software Engineer
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Principal Software Engineer sought for a Luton-based role supporting mission-critical embedded systems. Requires ISTQB knowledge, strong test automation skills (Python, C++), and active SC Clearance. You will create automated test scripts, perform integration and regression testing, and collabora...
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74.00 GBP / Hour
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Morson Talent
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Principal Cable Design Engineer
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Seeking a Principal Cable Design Engineer for a remote role with ad-hoc UK office attendance. You will lead high-voltage AC/DC cable system design from 11kV to 400kV, using CYMCAP and CAD. Requires expertise in UK HSE legislation, CDM, and client-facing consultancy. Earn £70-£90/hr (outside IR35)...
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70.00 - 90.00 GBP / Hour
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Morson Talent
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Principal Presales Engineer, Product Specialist - CDP, Martech, AI
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Twilio seeks a Principal Presales Engineer to bridge complex enterprise accounts with Product teams, specializing in CDP, Martech, and AI. You will architect multi-product solutions, drive technical wins, and influence product strategy through compelling storytelling. Based in the United Kingdom,...
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Stytch
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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.