22 of 22 Principal Software Engineer Jobs in London

Principal Software Engineer (Go/Systems) 🚀 Series B Scale Up 🔬 Life Sciences Salary : £170,000 plus package Location : Angel (3 days per week in office) Requirements : Backend engineering specialist, with expertise in Golang, Python, Rust, Kubernetes The Mission: Orchestrating Physical Reality 🤖 I am working with a Series … raised) disrupting the Life Sciences sector by building a cloud-to-hardware "Operating System" that automates human health. They are looking to hire a Principal Software Engineer who will be the technical heavyweight that 5–6 Staff Engineers rally behind. ⚡ The Technical Core The ecosystem is built ...

Principal Software Engineer/Developer (Java SpringBoot AWS) London/WFH to £120k Are you an experienced Java focussed Software Engineer, with technical project leadership and client facing skills? You could be progressing your career at a global technology consultancy. As a Principal Software Engineer you will lead client projects, often long term technical transformations, designing, developing and delivering a range of projects for clients, mainly within the financial services sector and with a focus on migrating legacy systems to AWS and introducing CI/CD pipelines and cloud deployments. ...

Principal Software Engineer – Platform/Distributed Systems - GO/Python Location: London (Hybrid – 3 days on‐site) Salary: £130,000 – £170,000 + ~15% bonus I’m recruiting on behalf of a high‐growth, product‐led technology company operating at the intersection of cloud software, distributed … leadership role for someone who wants real architectural authority, hands‐on impact, and influence over both technology direction and senior engineers. The role As Principal Software Engineer, you’ll act as the technical backbone of the organisation – defining architecture, setting engineering standards, and guiding platform evolution ...

Title: Senior/Principal Software Engineer Job Location: Rochester, Kent. Skills, Experience, Qualifications, If you have the right match for this opportunity, then make sure to apply today. Onsite Salary: Up to £65.000 per annumdepending on experience Who we are: Join BAE Systems and youll be part … delivering the advanced, technology-led defence, aerospace and security solutions of tomorrow shaping a safer future, for all of us. Role Description: As a Principal Software Engineer, you will lead the design and delivery of embedded software for complex , safety critical systems. You will develop drivers ...

Principal Software Engineer – AI & Innovation Recruiting a Principal Software Engineer with a proven track record of delivering innovative, AI driven solutions and the curiosity to explore beyond traditional technology boundaries. Within the newly createdAI & Innovation team, you will shape the future of the organisation … create something new. Key Responsibilities Build innovative MVPs to validate ideas and accelerate learning Lead the design and implementation of scalable, high-performance software systems Collaborate closely with Product, Design, QA, and Engineering teams Evaluate, experiment and recommend new technologies, frameworks and tools Mentor and coach engineers to create ...

Principal Software Engineer - AI & Innovation Recruiting a Principal Software Engineer with a proven track record of delivering innovative, AI driven solutions and the curiosity to explore beyond traditional technology boundaries. Within the newly createdAI & Innovation team, you will shape the future of the organisation ...

Energy Trading - Principal Software Engineer London About Indicium AI Indicium AI is trusted by the world's leading enterprises to deliver AI into production at scale. We are a global AI-native consultancy with proven experience across Financial Services, Energy & Utilities, Healthcare & Life Sciences, Retail … partners - including Anthropic, Databricks, AWS, OpenAI, and Microsoft - to deliver modern AI with speed and measurable impact. Overview Indicium AI are seeking an exceptional Principal Software Engineer to lead delivery of exciting engagements within our Energy & Commodities Trading sector. This role demands a unique combination of hands ...

Principal Full Stack Software Engineer Location: London - Hybrid - 1-2 days a week Salary: £110-130k + 10% Bonus Type: Permanent No Sponsorship Available Overview: We are seeking a Principal Full Stack Software Engineer to lead the design, development, and delivery of scalable … This is a senior, hands-on leadership role where you will shape technical direction, influence engineering standards, and drive best practice across the full software development lifecycle. You will work closely with product, architecture, and leadership teams to deliver robust, user-centric solutions while mentoring engineers and fostering ...

Principal Full Stack Software Engineer Location: Hybrid - 1-2 days a week Salary: £(Apply online only)k + 10% Bonus Type: Permanent No Sponsorship Available Overview: We are seeking a Principal Full Stack Software Engineer to lead the design, development, and delivery of scalable … This is a senior, hands-on leadership role where you will shape technical direction, influence engineering standards, and drive best practice across the full software development lifecycle. You will work closely with product, architecture, and leadership teams to deliver robust, user-centric solutions while mentoring engineers and fostering ...

Principal Engineer – Post-Purchase & Fulfilment | London (Hybrid) | Up to £155,000 Principal Engineer's! Own the end-to-end architecture of how a physical product moves from factory floor to customer doorstep. Design led consumer brand with over 30 million customers worldwide. This is a rare ...

Principal AI Engineer Up to £110,000 + Bonus Hybrid | London We’re partnered with a global leader in loyalty and customer engagement, looking for a Principal AI Engineer to join their London team. This role will include delivering customer centric solutions and scale production-grade … closely with the Head of AI Labs, you’ll lead the delivery of advanced AI systems that deliver real business impact. Responsibilities as a Principal AI Engineer: Lead end‐to‐end delivery of scalable, resilient AI/ML pipelines aligned to business goals. Build and deploy advanced ...

Senior/Principal Software Engineer Application Deadline: 31 March 2026 Department: Software Engineering Employment Type: Permanent Location: London (Hybrid) Compensation: £70,000 - £100,000/year Description Please note: This role requires applicants to hold active, or recently active, SC or DV clearance. This role also … kind that have to be secure, scalable, and actually usable by the people who rely on them. We’re looking for Senior and Principal Engineers who want to shape meaningful systems, influence technical direction, and work alongside capable people who care about doing the job properly. You’ll help ...

Office - Full time hours We are happy to discuss flexible working! Top 3 skills needed for this role: AI-Augmented Engineering Leadership Enterprise-Scale Software Architecture Engineering Governance in Regulated Environments What this role is all about: Our Software Engineers play a critical role in Vitalitys successful business … model by building and maintaining software solutions, in line with quality and time parameters, to enable operation as a fully integrated composite business, offering brilliant products with seamless, intuitive customer journeys. The Principal Software Engineer leads and plans development across large or multiple teams, providing deep ...

Office - Full time hours We are happy to discuss flexible working! Top 3 skills needed for this role: AI-Augmented Engineering Leadership Enterprise-Scale Software Architecture Engineering Governance in Regulated Environments What this role is all about: Our Software Engineers play a critical role in Vitality’s successful … business model by building and maintaining software solutions, in line with quality and time parameters, to enable operation as a fully integrated composite business, offering brilliant products with seamless, intuitive customer journeys.The Principal Software Engineer leads and plans development across large or multiple teams, providing deep ...

Office - Full time hours We are happy to discuss flexible working! Top 3 skills needed for this role: AI‐Augmented Engineering Leadership Enterprise‐Scale Software Architecture Engineering Governance in Regulated Environments What this role is all about: Our Software Engineers play a critical role in Vitality’s successful … business model by building and maintaining software solutions, in line with quality and time parameters, to enable operation as a fully integrated composite business, offering brilliant products with seamless, intuitive customer journeys. The Principal Software Engineer leads and plans development across large or multiple teams, providing ...

skills needed for this role: Enterprise system ownership Technical & architectural leadership Integrated cloud platforms What this role is all about: At Vitality, our Software Engineers power the technology behind our brilliant products and seamless customer experiences. You’ll build and maintain high-quality software that supports a fully … integrated, modern business, delivered with pace and precision.As a Principal Software Engineer, you’ll lead development across large or multiple teams, setting technical direction and raising engineering standards. You’ll bring deep expertise in your core specialism, strong capability in a second, and be developing a third. ...

international cross-border payments company are looking for a Principal Software Engineer to help build and scale their payment platform. You’ll work across the full stack - frontend, backend, cloud infrastructure, and data - designing reliable systems that power real financial transactions. You'll lead their latest platform ...

global AI-native consultancy is seeking a Principal Software Engineer to lead engagement delivery in the Energy & Commodities Trading sector. This hands-on role combines technical excellence and domain expertise, focusing on architecting scalable AI solutions that drive trading decisions. The successful candidate will work closely with ...

client - a global automotive systems industry leader - is looking to hire an Principal AI Software Engineer (Java) to join them on an initial 6-month contract, with a view to transition to permanent employment. This role will be operating as part of a high-functioning team focused … grade experience - or leastPoC forLLM's They will be creating agents and creating code that can run on production as AI agents Customer facing software/platform re-write experience Deep technical expertise in modern and AI-driven systems (engineering and architecture levels) Ownership of end-to-end, scalable ...

clients and with the communities in which we work and live. It is personal to all of us.” – Julie Sweet, Accenture CEO Accenture Software & Platform Engineering is over 1,000 people strong and provides end-to-end product engineering solutions which deliver tangible value, fast. We bring together … offer an exciting career working in a vibrant environment, with access to training and a global network of experts. As part of our Software & Platform Engineering team, you’ll be working with cutting-edge technologies and will have the opportunity to develop a wide range of new skills ...

Office - Full time hours We are happy to discuss flexible working! Top 3 skills needed for this role: AI-Augmented Engineering Leadership Enterprise-Scale Software Architecture Engineering Governance in Regulated Environments What this role is all about: O click apply for full job details ...

Founding Engineer | AI Startup | London (In-Office 5 Days/Week) | Up to £160k Base We’re hiring a Founding Engineer for a high-growth Series A AI startup building and shipping AI products end-to-end. This is a rare opportunity to join an ambitious team … AI. A strong product mindset and customer focus. Confidence working in fast-moving, ambiguous environments. Nice to have Founder, co-founder, or founding engineer experience. Customer-facing experience or strong exposure to customers. Full-stack experience in Python or TypeScript. Experience with modern cloud infrastructure, including Kubernetes, serverless ...