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Principal Engineer United Kingdom Jobs

299 Job Offers

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CS&A Principal Engineer
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Assystem seeks a CS&A Principal Engineer for the Box Encapsulation Plant at Sellafield, Cumbria. Requires chartered status (CEng MICE/MIStructE), nuclear sector experience, and proven engineering leadership. Lead design assurance and site teams on this critical nuclear project.
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ASSYSTEM
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Principal EC&I Engineer
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Assystem seeks a Principal EC&I Engineer in Warrington to lead nuclear, defence and infrastructure projects. Requires 10+ years in EC&I design, team leadership and regulated industry expertise. Apply now!
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ASSYSTEM
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Principal Design Engineer – Infrastructure
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Lead rail infrastructure design in York as Principal Design Engineer. Requires CEng, PTS certification, and proven experience delivering civil engineering projects. Competitive salary, car allowance, and strong benefits.
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AmcoGiffen
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Principal Design Engineer – Temporary Works
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Lead Temporary Works design across major rail and civils projects in Pontyclun as Principal Design Engineer. Requires IEng/CEng, Sentinel PTS and strong civil design experience. Competitive salary, car allowance and excellent benefits.
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Location
United Kingdom, Pont-y-clun
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AmcoGiffen
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Principal Engineer (Telecoms)
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Lead telecoms design on major rail infrastructure projects as Principal Engineer. Act as CRE, mentor engineering teams and ensure Network Rail compliance. Hybrid role in York or Cumbernauld with car allowance and strong benefits.
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United Kingdom, York, Cumbernauld
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AmcoGiffen
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Principal Electrical Building Services Engineer
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Lead electrical building services projects in Birmingham as Principal Electrical Engineer. Requires BEng/MEng, 5-10 years design experience, Chartered status, and Revit/MagiCAD skills. Flexible working and career growth offered.
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Royal HaskoningDHV
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Principal Process Design Engineer
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Lead water and wastewater process design projects as Principal Process Engineer in Manchester. Requires 10+ years regulated water industry experience, Chartered status, and strong technical leadership skills.
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Alexander Associates
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Principal Data Engineer
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Lead the Future State Data Platform strategy at Funding Circle in London. Requires 10+ years in Data Engineering and deep Snowflake, AWS, dbt and Airflow expertise. Enjoy flexible benefits and share schemes.
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Funding Circle
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Principal Security Engineer (AppSec)
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Teya seeks a Principal Security Engineer in London to lead SSDLC transformation and embed AppSec practices across engineering. Deep application security expertise and an attacker mindset required.
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Teya
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CS&A Principal Engineer
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Assystem seeks a CS&A Principal Engineer in Warrington to lead design and site engineering teams on the Box Encapsulation Plant at Sellafield. Requires chartered status (ICE or IStructE), nuclear sector experience, and strong structural design expertise.
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ASSYSTEM
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Principal Nuclear Security Engineer
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Assystem seeks a Principal Nuclear Security Engineer in Glasgow to provide engineering assurance for security-related nuclear assets. Requires high-hazard regulated experience, SyAPs knowledge, and security case expertise.
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ASSYSTEM
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Principal Java Engineer
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Lead Java development at a modern software house in Manchester. Drive Agile delivery, build features with Spring Boot, AWS and Kubernetes, and mentor your team. Bonus included.
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70000.00 - 80000.00 GBP / Year
Burns Sheehan
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Principal Engineer
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Motorway seeks a Principal Engineer in London to set technical strategy across product areas. Requires 10+ years in software engineering, deep AWS expertise, and strong API/identity architecture skills. Hybrid role with stock options.
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Motorway
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Principal Infrastructure Engineer
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Flo seeks a Principal Infrastructure Engineer in London to architect EKS at scale, shape PostgreSQL, DynamoDB and Kafka patterns, and build golden paths. Requires deep Kubernetes, AWS and Terraform expertise.
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Flo Health
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Principal Product Security Engineer
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Lead product security strategy at Chainguard, a fast-growing open source security leader. Requires 10+ years in product/application security, cloud-native expertise, and secure SDLC ownership. Remote-first with equity and strong benefits.
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Chainguard
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Principal Process Engineer - Water
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Lead water and wastewater process design at Egis as Principal Process Engineer in Manchester. Requires 8-10+ years' experience, Chartered status, and BioWin/SUMO modelling skills. Hybrid role with fast progression.
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Egis Group
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Principal Electrical Engineer - Water
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Lead electrical/EICA design on major UK water projects with Egis in Manchester. Requires chartered status, 7-10+ years' water sector experience and multidisciplinary leadership skills. Hybrid working with fast progression.
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Egis Group
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Principal Process Engineer - Water
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Lead water and wastewater process design at Egis as Principal Process Engineer in Bristol. Requires 8-10+ years' experience, Chartered status, and BioWin/SUMO modelling skills. Hybrid role with fast progression.
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Egis Group
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Principal Machine Learning Engineer
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ASOS seeks a Principal Machine Learning Engineer in London to lead AI-powered fashion discovery within the Search & Discovery team. Requires extensive experience building large-scale ML systems, owning technical architecture, and a product-focused mindset.
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ASOS
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CS&A Principal Engineer
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Lead CS&A design and site engineering for a major nuclear JV in Warrington. Oversee structural design reviews, TQ/PP submissions and as-built documentation, with regular Sellafield site visits.
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ASSYSTEM
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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.