26 to 50 of 56 Principal Software Engineer Jobs in London

platform with a lot of moving parts, and a small engineering team that owns all of them. We're looking for a Principal Software Engineer who raises the bar on how we ship, not just what we ship. What you'll be doing: Owning features across … hard and varied We move fast and we're getting smarter about how we do it What you'll bring: 12+ years of software engineering experience with a track record of delivering reliable, scalable systems Strong full-stack skills — React/TypeScript, backend services, cloud infrastructure Experience building ...

Strategic Enterprise Technology Leadership Recognised Java Engineering Expertise Advanced Architecture & Systems Integration Capability What this role is all about We're looking for a Principal Software Engineer to join Vitality's Engineering function, providing technical leadership across complex enterprise platforms and customer-facing solutions. This … highly influential role responsible for shaping engineering standards, driving architectural decisions, leading large-scale technical initiatives and ensuring the successful delivery of integrated software solutions that support critical business outcomes. The role operates across multiple teams and works closely with senior stakeholders, architects and third-party partners to deliver ...

Northrop Grumman UK is seeking a Principal Software Engineer to design, develop, and maintain the critical infrastructure powering our services. You will lead multiple engineering teams, set technical direction, and deliver solutions with real customer impact. You’ll mentor engineers, collaborate with partners and customers, and ensure ...

Corpay One, Inc. is seeking a Principal Software Engineer in London to lead technically across the Client Lifecycle domain. You will drive design, architecture, and delivery of secure, scalable systems, while remaining hands-on and mentoring engineers. The role emphasizes cloud-native architectures on AWS, data-driven ...

Defaqto is hiring a Principal Software Engineer in London to shape how we build software. You will lead the shift from AI-assisted coding to AI-led delivery, own high‐risk initiatives, and set engineering standards across the Technology function. The role reports to the Head ...

Principal AI Software Engineer £725-800 per day London x1 day per week in St Pauls 6 month initial contract Inside IR35 The opportunity This is a contract engagement supporting a major Information Security AI transformation, a large programme that is modernising and automating the security operating … with a good deal of autonomy to deliver a defined set of outcomes, on complex and current problems in AI security, and collaborate with software and solution architects to define target architectures, and coordinate workloads of software engineers as well as being hands on. What you would deliver ...

leading technology firm in Greater London is seeking a Principal Software Engineer to design, develop, and maintain critical infrastructure. This role involves ownership of team deliverables, collaboration with external partners, and mentoring engineers. Candidates must have strong capabilities in backend and frontend development, design scalable systems ...

Morgan Stanley in London seeks a Principal Software Engineer to own design, development and deployment of critical credit derivatives solutions. You will partner with trading, strats and COO teams to translate business needs into robust technical projects and to deliver features that raise trader efficiency and platform ...

easyJet Airline Company PLC is seeking a Principal Software Engineer to lead the eCommerce Platform Delivery team. You will drive the technical vision, architecture, and delivery of high‐performance, secure systems across multiple squads. You will mentor engineers, champion best practices, and ensure platform resilience while collaborating ...

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 ...

Simple Machines is a leading boutique technology firm seeking a Principal Software Engineer to design and deliver complex, scalable systems across backend, APIs, frontend, data pipelines, and cloud infrastructure. You’ll work with internal teams and client stakeholders, owning outcomes end-to-end in a consultative engineering ...

ZoomInfo is accelerating careers with a fast-paced, bold culture. We are seeking a Principal Software Engineer to own features across the full stack—from React frontends to backend APIs and cloud infrastructure—while shipping fixes for production incidents. You will build AI agents, orchestration workflows ...

that help scientific and enterprise customers automate complex physical workflows across laboratory instruments, robotics systems, scientific data, and cloud services. We are seeking a Principal Software Engineer to help design and build the Robotics Automation Platform. This is a senior hands-on individual-contributor role … engineer who can lead the design and implementation of core platform services while working closely with Product Management, Shared Experience & Authoring, Applied Science, OCI platform teams, customers, and automation vendors. You will build the foundation for the first Robotics Automation pilots and help establish a platform that can support ...

Principal/Senior Software Engineer x2 Inside IR35 Contract Rate: up to £800/day Location: Remote/London Duration: 6 months initially Description: The opportunity This is a contract engagement supporting a major Information Security AI transformation, a large programme that is modernising and automating … security operating model with agentic AI. We are looking for both a Principal and Senior hands-on engineer to drive the build of a portfolio of agentic AI security applications, defining the solution architecture and contributing to the most complex components of the solution and system design. ...

About the Role As a Principal Software Engineer at Radiant, you’ll be a hands‐on technical leader, driving the design and development of our most critical systems, including our GPU orchestration layer, inference‐serving infrastructure, and core platform APIs. You’ll set the standard for engineering … excellence across the team, working closely with other principal engineers to align on strategy and drive technical leadership. You’ll partner with peers in infrastructure and machine learning to deliver high-performance AI systems, and mentor engineers across multiple squads. While you won’t have direct reports ...

JPMorgan Chase & Co. is seeking a Principal Software Engineer within the Applied Innovation (of AI) Engineering team in the CDAO Technology Group. You will design, develop, deploy, and maintain advanced AI products while collaborating with software engineers, data engineers, and data scientists to deliver trusted solutions. ...

client is a software consultancy. Principal Engineer Location : Waterloo, London, England, UK Hybrid (1 day per week in office) Who We Are We bring life to the best ideas. Founded in 2006 and headquartered in Chicago, we are a technology solutions consultancy that partners with organisations from ...

Gloucester, and Manchester (England); we are committed to investing in British careers and technology development. Role & Responsibilities You will be part of our experienced software dev function, working in a cross-functional team, delivering and deploying critical software across a variety of business areas. Design and build software … sector this team is working in, we require all candidates to hold an active eDV clearance for this role. Location: London, Permanent, Onsite. Role: Principal Software Engineer. About Raytheon UK, an aerospace and defense company that provides advanced systems and services for commercial, military and government customers worldwide. ...

Gemba Advantage seeks Senior/Principal Software Engineers to design and deliver secure, scalable software in small agile teams in London. You’ll stay hands-on while shaping architecture, set engineering standards, and work directly with customers to solve complex problems. The role requires active ...

Business Area: Asset Management Platform Location: London Reporting to: Client Technology Delivery Lead Job title: Principal Salesforce Engineer Who we’re looking for We are seeking a hands‐on Salesforce Engineer with a proven track record of designing, building, and delivering robust, scalable, and secure solutions … working with global colleagues and stakeholders and sensitivity to cultural differences, time zones etc. What you’ll be like The ideal candidate for the Principal Salesforce Engineer role will be a pragmatic and collaborative technical leader who takes pride in engineering craftsmanship and delivering business value. They will ...

global financial services organisation seeks a Principal Cybersecurity Engineer to help build the next generation of data-driven security capabilities at exceptional scale. This is a senior (Director grade) individual contributor position. The role requires a candidate with deep cyber expertise and elite hands-on software engineering … from a security product vendor, cyber start-up, red team/offensive security background, or a large-scale engineering environment where cybersecurity, data and software genuinely intersect. You will be a senior thought leader who is looking for a role which offers the opportunity to influence engineering direction, lead ...

helps you realize your potential. Our team is key to our success. We’re people-first. We value collaboration, curiosity and commitment. As a Principal Engineer at JPMorgan Chase within the Accelerator Business in the Platform Team, you are the heart of this venture, focused on getting smart … term architectural strategy for platform engineering, ensuring competitive advantage and scalability. Mentor and coach senior engineers across teams, elevating the technical bar and championing Software Engineering Communities of Practice. Serve as the key technical liaison for product, business, and security stakeholders, translating technical decisions into business impact. Lead ...

Meta seeks experienced engineers to join the Central Integrity team as Principal Engineer (Technical Leadership). You will own the multi-year strategy for account and entity compromise across the Family of Apps, collaborating with executive leadership and partner orgs to reduce real-world harm fastest. You will ...

helps you realize your potential. Our team is key to our success. We’re people-first. We value collaboration, curiosity and commitment. As a Principal Engineer at JPMorgan Chase within the Accelerator, you are the heart of this venture, focused on getting smart ideas into the hands ...

powered and data-driven businesses . We work with enterprise organisations on a global stage, reinventing how they design, build, and operate AI powered software at scale with speed. Our Purpose: We're on a mission to reinvent what's possible with AI in enterprise environments . Our Software … working at the absolute cutting edge of what's possible with today's most advanced AI technologies. Key Responsibilities Define and evolve the overall software architecture and technology vision for the organisation. Provide deep technical guidance to multiple engineering teams across projects. Lead the design and delivery of large ...