51 to 75 of 117 Principal Engineer Jobs in the South East

Principal Software Engineer (Frontend Focused) | ~£150K | AI Learning Platform | London Hybrid I’m working with a rapidly scaling AI start-up founded by three Cambridge alumni (ex-Google, Amazon, YouTube) on a mission to make learning effortless and fun. Their platform uses AI and gamification to help millions of people learn anything, transforming study materials into quizzes, flashcards … challenges that actually make learning stick. With 1M+ monthly users , $4M ARR , and $16M Series A funding , they’re entering a hypergrowth phase and looking for a Full-Stack Engineer (frontend-focused) to shape how users interact with the product at scale. 💡 Why it’s worth your time: Join a rocket-ship at the perfect inflection point proven traction More ❯

Principal Software Engineer (Frontend Focused) | ~£150K | AI Learning Platform | London Hybrid I’m working with a rapidly scaling AI start-up founded by three Cambridge alumni (ex-Google, Amazon, YouTube) on a mission to make learning effortless and fun. Their platform uses AI and gamification to help millions of people learn anything, transforming study materials into quizzes, flashcards … challenges that actually make learning stick. With 1M+ monthly users , $4M ARR , and $16M Series A funding , they’re entering a hypergrowth phase and looking for a Full-Stack Engineer (frontend-focused) to shape how users interact with the product at scale. 💡 Why it’s worth your time: Join a rocket-ship at the perfect inflection point proven traction More ❯

Principal Software Engineer (Frontend Focused) | ~£150K | AI Learning Platform | London Hybrid I’m working with a rapidly scaling AI start-up founded by three Cambridge alumni (ex-Google, Amazon, YouTube) on a mission to make learning effortless and fun. Their platform uses AI and gamification to help millions of people learn anything, transforming study materials into quizzes, flashcards … challenges that actually make learning stick. With 1M+ monthly users , $4M ARR , and $16M Series A funding , they’re entering a hypergrowth phase and looking for a Full-Stack Engineer (frontend-focused) to shape how users interact with the product at scale. 💡 Why it’s worth your time: Join a rocket-ship at the perfect inflection point proven traction More ❯

Principal/Senior-Staff Engineer I'm supporting a global tech company that's going through an exciting transformation and is looking for a high-impact Principal/Senior-Staff Engineer . This is a hands-on individual contributor role with significant influence across teams and leadership, directly reporting into the CTO. The role is ideal More ❯

Principal Software Engineer £95,000 + Bonus + Benefits | Hybrid (UK) Method is partnering with a leading infrastructure technology company that's rebuilding its software architecture from the ground up. The mission is to create connected, secure, and scalable systems that enable smarter infrastructure, and deliver trusted connectivity across multiple sectors. They're looking for a Principal Software Engineer, a hands-on technical authority who will set engineering standards, solve complex challenges, and shape the next generation of event-driven microservices powering their global platform. The role You'll work at the top of the engineering track, designing and delivering high-performance, distributed systems while guiding others through implementation and problem-solving. This is a More ❯

Principal AI Engineer - up to £130,000 Salary - £110,000 - 130,000 Working policy - 3 days onsite weekly About the client We're partnered with an AI-native company helping global enterprises transform how they design, build, and operate AI-powered software. Their team blends deep technical expertise with proprietary frameworks to deliver AI systems that create measurable … business impact fast. The Role As a Principal AI Engineer, you'll lead the design, development, and deployment of advanced AI solutions at scale. You'll guide technical direction, mentor teams, and work directly with senior stakeholders to turn bold ideas into real-world impact. You will redefine what's possible with AI in enterprise environments. If you More ❯

Principal Front Office Developer - Trade Capture, Pricing, Risk, and STP You will be: Accountable for the successful software delivery from inception to deployment for the complete Front Office Derivatives Technology Stack Deliver key strategic business goals by identifying systems changes that support revenue generation and regulatory reporting for the Front Office businesses, focusing on Derivatives Markets Build the future More ❯

Principal Front Office Developer - Trade Capture, Pricing, Risk, and STP You will be: Accountable for the successful software delivery from inception to deployment for the complete Front Office Derivatives Technology Stack Deliver key strategic business goals by identifying systems changes that support revenue generation and regulatory reporting for the Front Office businesses, focusing on Derivatives Markets Build the future More ❯

Principal Front Office Developer - Trade Capture, Pricing, Risk, and STP You will be: Accountable for the successful software delivery from inception to deployment for the complete Front Office Derivatives Technology Stack Deliver key strategic business goals by identifying systems changes that support revenue generation and regulatory reporting for the Front Office businesses, focusing on Derivatives Markets Build the future More ❯

Principal AI Engineer (Enterprise AI Transformation) - up to £130,000 Salary - £110,000 - 130,000 Working policy - 3 days onsite weekly About the client We're partnered with an AI-native company helping global enterprises transform how they design, build, and operate AI-powered software. Their team blends deep technical expertise with proprietary frameworks to deliver AI systems … that create measurable business impact fast. The Role As a Principal AI Engineer, you'll lead the design, development, and deployment of advanced AI solutions at scale. You'll guide technical direction, mentor teams, and work directly with senior stakeholders to turn bold ideas into real-world impact. You will redefine what's possible with AI in enterprise More ❯

Role: Principal Software Engineer Location: Berkshire Industry: Intelligence, Defence Job Type: Permanent, Onsite Salary: Competitive + Allowance + Bonus + Benefits Join a cutting edge engineering team developing high-performance embedded and application software for complex systems in the Intelligence/Cyber world. As a Lead Software Engineer, you’ll provide technical leadership across the full software More ❯

Role: Principal Software Engineer Location: Berkshire Industry: Intelligence, Defence Job Type: Permanent, Onsite Salary: Competitive + Allowance + Bonus + Benefits Join a cutting edge engineering team developing high-performance embedded and application software for complex systems in the Intelligence/Cyber world. As a Lead Software Engineer, you’ll provide technical leadership across the full software More ❯

Principal Platform Engineer Fintech London Up to £200k + Equity London (Min 4 days per week in office) Maze is partnering with a stealth-mode startup that's rebuilding core banking from the ground up. They're creating the world's first open-source, AI-native "Thin Ledger"-set to replace legacy infrastructure at Tier 1 banks. We … re looking for a Principal Platform Engineer to drive the infrastructure behind mission-critical systems: think active-active, five-nines uptime, and real-time observability at global scale. What You'll Do: Own platform architecture for our next-gen ledger infrastructure Scale multi-region Kubernetes environments across cloud & on-prem Harden distributed systems (Kafka, Redis, CockroachDB) for global More ❯

Principal Platform Engineer | Fintech | London | Up to £200k + Equity | London (Min 4 days per week in office) Maze is partnering with a stealth-mode startup that's rebuilding core banking from the ground up. They’re creating the world’s first open-source, AI-native "Thin Ledger"—set to replace legacy infrastructure at Tier 1 banks. We … re looking for a Principal Platform Engineer to drive the infrastructure behind mission-critical systems: think active-active, five-nines uptime, and real-time observability at global scale. What You'll Do: Own platform architecture for our next-gen ledger infrastructure Scale multi-region Kubernetes environments across cloud & on-prem Harden distributed systems (Kafka, Redis, CockroachDB) for global More ❯

Principal Platform Engineer | Fintech | London | Up to £200k + Equity | London (Min 4 days per week in office) Maze is partnering with a stealth-mode startup that's rebuilding core banking from the ground up. They’re creating the world’s first open-source, AI-native "Thin Ledger"—set to replace legacy infrastructure at Tier 1 banks. We … re looking for a Principal Platform Engineer to drive the infrastructure behind mission-critical systems: think active-active, five-nines uptime, and real-time observability at global scale. What You'll Do: Own platform architecture for our next-gen ledger infrastructure Scale multi-region Kubernetes environments across cloud & on-prem Harden distributed systems (Kafka, Redis, CockroachDB) for global More ❯

Principal Platform Engineer | Fintech | London | Up to £200k + Equity | London (Min 4 days per week in office) Maze is partnering with a stealth-mode startup that's rebuilding core banking from the ground up. They’re creating the world’s first open-source, AI-native "Thin Ledger"—set to replace legacy infrastructure at Tier 1 banks. We … re looking for a Principal Platform Engineer to drive the infrastructure behind mission-critical systems: think active-active, five-nines uptime, and real-time observability at global scale. What You'll Do: Own platform architecture for our next-gen ledger infrastructure Scale multi-region Kubernetes environments across cloud & on-prem Harden distributed systems (Kafka, Redis, CockroachDB) for global More ❯

Job Title: Principal Systems Engineer Location: Frimley. We offer a range of hybrid and flexible working arrangements - please speak to your recruiter about the options for this particular role Salary: Negotiable dependant on experience What you'll be doing: Provide oversight and technical ownership of CCS design, leading design decisions and supporting the Engineering Manager in delivering in … and experiences: Essential: Extensive experience in network or software engineering, ideally with a background in operations Ability to take the lead on technical matters and provide expert guidance Chartered Engineer status or working towards Specialist expertise in Combat Systems, particularly in relation to submarines, would be advantageous Familiarity with DOORS and prior hands-on experience using it Proven experience More ❯

Role: Principal Acoustics Engineer Salary: £60,000 - £80,000 Location: Cambridge area You will help deliver best in class audio clarity and loudness for handheld mobile radio products used in challenging, noisy environments where voice intelligibility and reliability are critical. You will work closely with hardware, software and mechanical teams to develop, integrate and maintain current and next More ❯

Principal Software Engineer High-growth, Purpose-Led and A funded Fintech Hybrid - London Python, TypeScript, React A leading fintech scale-up is hiring a Senior Software Engineer to join its high-performing engineering organisation in London. This is an opportunity to contribute to a platform designed to improve finance globally - with real impact at scale. The company … first platform. Backed by leading venture capital and impact investors, the organisation is entering a new phase of growth, with engineering at the core. The Opportunity As a Senior Engineer, you will play a key role in designing and delivering scalable, reliable systems that handle significant volumes of real-time data and transactions. You'll collaborate with product, data … and platform teams to deliver high-impact features that directly improve user financial wellbeing. This is a hands-on role for an engineer who values clean architecture, measurable outcomes, and meaningful user impact. What You'll Do: Design and implement distributed systems that are resilient, scalable, and secure. Own technical decision-making across architecture and implementation - selecting the right More ❯

Principal Software Engineer | High-growth, Purpose-Led and A* funded Fintech | Hybrid – London **Python, TypeScript, React** A leading fintech scale-up is hiring a Senior Software Engineer to join its high-performing engineering organisation in London. This is an opportunity to contribute to a platform designed to improve finance globally — with real impact at scale. The company … first platform. Backed by leading venture capital and impact investors, the organisation is entering a new phase of growth, with engineering at the core. The Opportunity As a Senior Engineer, you will play a key role in designing and delivering scalable, reliable systems that handle significant volumes of real-time data and transactions. You'll collaborate with product, data … and platform teams to deliver high-impact features that directly improve user financial wellbeing. This is a hands-on role for an engineer who values clean architecture, measurable outcomes, and meaningful user impact. What You’ll Do: Design and implement distributed systems that are resilient, scalable, and secure. Own technical decision-making across architecture and implementation — selecting the right More ❯

Principal Software Engineer | High-growth, Purpose-Led and A* funded Fintech | Hybrid – London **Python, TypeScript, React** A leading fintech scale-up is hiring a Senior Software Engineer to join its high-performing engineering organisation in London. This is an opportunity to contribute to a platform designed to improve finance globally — with real impact at scale. The company … first platform. Backed by leading venture capital and impact investors, the organisation is entering a new phase of growth, with engineering at the core. The Opportunity As a Senior Engineer, you will play a key role in designing and delivering scalable, reliable systems that handle significant volumes of real-time data and transactions. You'll collaborate with product, data … and platform teams to deliver high-impact features that directly improve user financial wellbeing. This is a hands-on role for an engineer who values clean architecture, measurable outcomes, and meaningful user impact. What You’ll Do: Design and implement distributed systems that are resilient, scalable, and secure. Own technical decision-making across architecture and implementation — selecting the right More ❯

Principal Software Engineer | High-growth, Purpose-Led and A* funded Fintech | Hybrid – London **Python, TypeScript, React** A leading fintech scale-up is hiring a Senior Software Engineer to join its high-performing engineering organisation in London. This is an opportunity to contribute to a platform designed to improve finance globally — with real impact at scale. The company … first platform. Backed by leading venture capital and impact investors, the organisation is entering a new phase of growth, with engineering at the core. The Opportunity As a Senior Engineer, you will play a key role in designing and delivering scalable, reliable systems that handle significant volumes of real-time data and transactions. You'll collaborate with product, data … and platform teams to deliver high-impact features that directly improve user financial wellbeing. This is a hands-on role for an engineer who values clean architecture, measurable outcomes, and meaningful user impact. What You’ll Do: Design and implement distributed systems that are resilient, scalable, and secure. Own technical decision-making across architecture and implementation — selecting the right More ❯

Lead AI Engineer/Consultant - Greenfield Outside IR35 £600 - £750pd flexible for the right person RAG experience a must. About the Company Market leading SaaS organisation building out their AI function. About the Role This project is a greenfield build out of AI capabilities. They are starting with RAG use cases as a low bar, but are targeting a … rich Agentic implementation in the near term. The incumbent has an opportunity to work on the foundational architectural definition and implementation. Responsibilities Hands-on AI Engineer at principal/staff level to build an AI team to deliver an AI capability. Lead design, architecture, and delivery of advanced AI/ML and generative AI solutions, ensuring scalable, secure More ❯

Lead AI Engineer/Consultant - Greenfield Outside IR35 £600 - £750pd flexible for the right person RAG experience a must. About the Company Market leading SaaS organisation building out their AI function. About the Role This project is a greenfield build out of AI capabilities. They are starting with RAG use cases as a low bar, but are targeting a … rich Agentic implementation in the near term. The incumbent has an opportunity to work on the foundational architectural definition and implementation. Responsibilities Hands-on AI Engineer at principal/staff level to build an AI team to deliver an AI capability. Lead design, architecture, and delivery of advanced AI/ML and generative AI solutions, ensuring scalable, secure More ❯

Lead AI Engineer/Consultant - Greenfield Outside IR35 £600 - £750pd flexible for the right person RAG experience a must. About the Company Market leading SaaS organisation building out their AI function. About the Role This project is a greenfield build out of AI capabilities. They are starting with RAG use cases as a low bar, but are targeting a … rich Agentic implementation in the near term. The incumbent has an opportunity to work on the foundational architectural definition and implementation. Responsibilities Hands-on AI Engineer at principal/staff level to build an AI team to deliver an AI capability. Lead design, architecture, and delivery of advanced AI/ML and generative AI solutions, ensuring scalable, secure More ❯