1 to 25 of 27 Principal Engineer Jobs in London

Principal Software Engineer page is loaded Principal Software Engineer Apply locations: London Type: Full time Posted on: Posted Yesterday Job requisition id: R98993 About our Team : Elsevier is a global information analytics company that helps institutions and professionals progress science, advance healthcare, and improve performance for the benefit of humanity. We serve the research, academic, and … and innovative technologies. We support our corporate customers, R&D professionals, engineers, scientists, and marketing leaders to innovate and commercialize ideas, products, and processes. About the Role: As a Principal Software Engineer, you will participate in technical discussions to design solutions that meet product requirements, develop test-driven code, pair with team members, mentor juniors, and support existing More ❯

Principal Software Engineer Location: Remote first (Occasional travel to London) Salary: £95,000 - £120,000 + equity + benefits An established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation digital solutions. This is an opportunity to shape greenfield projects from … do I need to be successful? Degree in Computer Science or equivalent hands-on experience. 7+ years' experience in backend software development, including several years in a senior or principal-level engineering role. Expertise in Python (or a similar backend language), with proven experience designing distributed systems, APIs, and microservices at scale. Deep understanding of software architecture, cloud infrastructure More ❯

New Job Opportunity - Principal Telecoms Engineer - Initial 12 Month Outside IR35 Contract Our Client has a requirement for a Principal Telecom Engineer , who will be required to work on a contract basis in Woking. Location : Central London, SW1V 1PX Contract Length: Initially 12 Months IR35 Status: Outside IR35 Requirements : 5 days per week in office (from … time to understand requirements in detail and offer sound advice to both clients and candidates. We actively recruit at all levels and this is a superb opportunity for a Principal Telecom Engineer looking for new employment. As part of putting people first, we strive to be an equal opportunities employer and we are always looking to increase the More ❯

Principal Python Engineer London Permanent Hybrid Ncounter is supporting a global investment firm in hiring a Software Developer to help design and evolve internal compute frameworks that underpin their trading and research platforms. This is a high-impact role, working at the intersection of software engineering and distributed systems, with the opportunity to build scalable tools and frameworks … CD automation This role offers the chance to work on complex technical challenges at scale, with direct impact on high-performance computing platforms. If you re a skilled Python engineer with distributed systems expertise and want to join a world-class engineering environment, apply today for a confidential conversation. More ❯

Principal Python Engineer London | Permanent | Hybrid Ncounter is supporting a global investment firm in hiring a Software Developer to help design and evolve internal compute frameworks that underpin their trading and research platforms. This is a high-impact role, working at the intersection of software engineering and distributed systems, with the opportunity to build scalable tools and frameworks … CD automation This role offers the chance to work on complex technical challenges at scale, with direct impact on high-performance computing platforms. If you’re a skilled Python engineer with distributed systems expertise and want to join a world-class engineering environment, apply today for a confidential conversation. More ❯

Principal Full Stack Engineer React, C#, AWS Global SaaS Were hiring a Principal Engineer/Lead Full Stack Developer to join a market-leading B2B SaaS business. This is a chance to shape the future of a cutting-edge platform, driving automation, modernisation, and AI-driven innovation. Role requirements: Be the technical authority across squads, owning … best practices. Partner with Product to balance scope, speed, and quality always shipping value. Drive transformation: retire legacy code, reduce tech debt, and improve performance and reliability. Required experience: Principal full stack expertise (React + TypeScript, C#/.NET Core or Node.js). Proven experience designing scalable, secure microservices on AWS. Event driven architecture. Strong database fundamentals (MySQL/ More ❯

Principal Software Engineer - Frontend London (Remote First - Occasional travel) Salary: £95,000 - £120,000 + equity + benefits An established, global technology business within the hospitality-tech industry is seeking a talented Principal Frontend Software Engineer to help build and scale cutting-edge digital solutions. This is a chance to work on greenfield projects - building new … solutions. What do I need to be successful: Degree in Computer Science or equivalent hands-on experience. 7+ years in frontend software development, including experience in a lead or principal engineering capacity. Deep expertise in React, TypeScript, and modern frontend architecture (state management, component design, performance optimisation). Strong understanding of cloud-based infrastructures (GCP, AWS, or Azure) and More ❯

Principal Full Stack Engineer React, C#, AWS Global SaaS Were hiring a Principal Engineer/Lead Full Stack Developer to join a market-leading B2B SaaS business. This is a chance to shape the future of a cutting-edge platform, driving automation, modernisation, and AI-driven innovation. Role requirements: Be the technical authority across squads, owning More ❯

Principal Software Engineer - Frontend London (Remote First - Occasional travel) Salary: £95,000 - £120,000 + equity + benefits An established, global technology business within the hospitality-tech industry is seeking a talented Principal Frontend Software Engineer to help build and scale cutting-edge digital solutions click apply for full job details More ❯

Principal Java Developer/Engineer Fully Remote My client believe that focused and empowered teams can do great things so you'll find that they are a curious, driven, and pragmatic bunch who believe in outcomes over outputs, and we're looking for like-minded individuals to join them on their journey. Duties and Responsibilities Understand partner needs More ❯

Principal Java Developer/Engineer Fully Remote My client believe that focused and empowered teams can do great things so you'll find that they are a curious, driven, and pragmatic bunch who believe in outcomes over outputs, and we're looking for like-minded individuals to join them on their journey. Duties and Responsibilities Understand partner needs More ❯

We are looking to hire a Senior or Principal Engineer for our PFI contract in Portsmouth. Main Purpose of the Job We are currently seeking to recruit an enthusiastic and experienced Engineer to join our Civil Structures Team on the Portsmouth City Council Highways PFI Contract with Colas Ltd. The successful candidate will support the team in More ❯

About The Role Deadline for applications: 11:59pm on 31st October 2025 Were looking for a Principal Software Engineer to shape the technical direction of high-profile projects and lead the delivery of modern, scalable software. We use technology to create impactful, human-centred solutions that make a difference to users and organisations. We believe great engineering happens … project risks, helping teams navigate complex technical challenges. About You Professional knowledge and experience Essential Extensive experience in software engineering, with a focus on large-scale, complex systems. Polyglot engineer comfortable working across multiple languages and frameworks (weve used Python, Java, Kotlin, Node.js, C#, JavaScript, Express, React and Next.js to name a few). Passion for learning new technologies More ❯

We are looking for a Principal Software Engineer (we call them Principal Software Craftspeople) who shares the same values of pragmatism, professionalism and transparency as us to join our team. You'd be utilising your expertise with clients, helping to shape Codurance, and being involved in coaching and mentoring across the company. We support our clients in More ❯

We are looking for a Principal Software Engineer (we call them Principal Software Craftspeople) who shares the same values of pragmatism, professionalism and transparency as us to join our team. You'd be utilising your expertise with clients, helping to shape Codurance, and being involved in coaching and mentoring across the company. We support our clients in More ❯

Exciting opportunity for a Principal AI Engineer with a strong focus on Generative AI and Large Language Models (LLMs) to join this world leading Energy Trading company. You will be responsible for initiating, development and deployment of GenAI solutions/products in an agile fashion to meet demand across multiple business lines. Key Characteristics Lead the technical direction More ❯

for pioneers who want to lead this transformation, working at the absolute cutting edge of what's possible with today's most advanced AI technologies. Role Overview: As a Principal AI Engineer at WeBuild-AI, you will design, develop, and deploy innovative AI solutions that transform our clients' businesses. You'll leverage cutting-edge language models, agent frameworks More ❯

on continuous deployment and iterative delivery, well-tested to ensure our code runs reliably, allowing you to focus on delivering value to merchants in a fluid manner. As a Principal Software Engineer, you will: Take responsibility for the success of the most important projects in the company. Solve highly complex challenges with simple solutions, often where neither the … defined. Be a significant hands-on contributor, delivering code contributions that demonstrate best practices and set a high quality bar on a regular basis. Work with a community of Principal Engineers and tech leaders to be a key influencer for strategic tech decisions, Continually evolve our engineering practices using data insights and industry knowledge. Mentor and coach other engineers More ❯

works collaboratively to offer specialist advice, best practice and technology to all areas of our business specifically designed for our global reach. About the Role We're seeking a Principal Full Stack Engineer to lead the design, development, and scaling of AI-powered digital products that serve infrastructure, engineering, and consulting professionals around the globe. This is a More ❯

About The Role Deadline for applications: 11:59pm on 31st October 2025 Were looking for a Principal Software Engineer to shape the technical direction of high-profile projects and lead the delivery of modern, scalable software. We use technology to create impactful, human-centred solutions that make a difference to users and organisations click apply for full job More ❯

Job Title: Systems Engineer (Requirements & Validation) Location: West London Job Type: Permanent, Full-time Salary: Competitive We are seeking a meticulous and methodical Systems Engineer for a permanent role based in West London. This position is ideal for someone with a passion for innovation and a structured approach to problem-solving. You will apply core systems engineering principles More ❯

Join Our Client as a Principal Control Systems Engineer (Perm/Fixed Term) Are you a seasoned control systems professional with a passion for innovation and a background in defence or highly regulated industries? An exciting opportunity awaits to become a key contributor within a leading organisation dedicated to delivering advanced naval platform management solutions. Our Client is … development, and advancement within a supportive environment. Be part of a forward-thinking organisation that values innovation, diversity, and inclusivity. Application Process If you are an experienced control systems engineer ready to take on the challenges of a regulated defence environment, we would love to hear from you. Please submit your CV for review, and our recruitment team will More ❯

Test Engineers play a critical role in Vitality’s successful business model by planning and executing tests on products and features to validate that they are fit for purpose.The Principal test engineer leads and plans testing across large or multiple teams, providing expertise in many technical areas or specialisms with very deep knowledge in a particular technical area. More ❯

Job Title: Systems Engineer (Requirements & Validation) Location: West London Job Type: Permanent, Full-time Salary: Competitive We are seeking a meticulous and methodical Systems Engineer for a permanent role based in West London click apply for full job details More ❯

We are hiring a Principal Machine Learning Engineer to work on cutting-edge Research & Development. As innovators in speech technology, our mission is to Understand Every Voice-a vision that has propelled us to be world leaders of Voice AI, with STT, TTS, and Flow; our brand new Conversational AI platform. Fuelled by innovation, inclusivity, and a passion … for making a global impact through world-leading Speech AI, we're looking for an experienced Machine Learning Engineer to accelerate our efforts towards exceptional speech solutions. Our Modelling Team trains diverse models, including large self-supervised ones, supporting Speechmatics towards being the most accurate speech recognition system globally. It also ensures their deployment into production, working with the More ❯