12 principal engineer jobs found in London

This role is delivered within secure environments. Candidates must be eligible for UK SC clearance and hold UK citizenship. Join the Mission We are a fast‑growing startup building scalable, high‑quality digital products at pace. Our success depends on strong engineering foundations, pragmatic architecture, and ways of working that enable teams to deliver value continuously. We are looking for a Principal Engineer to play a critical leadership role across our engineering and architecture community. This is an opportunity to shape how we build, not just what we build—embedding effective engineering processes, modern delivery practices, and a culture of continuous improvement as the company scales. This role suits a senior technologist who thrives in ambiguity, enjoys influencing without authority, and wants to leave a lasting imprint on how engineering operates within a growing organisation. About the Opportunity As a Principal Engineer, you will...

This role is delivered within secure environments. Candidates must be eligible for UK SC clearance and hold UK citizenship. Join the Mission We are a fast‑growing startup building scalable, high‑quality digital products at pace. Our success depends on strong engineering foundations, pragmatic architecture, and ways of working that enable teams to deliver value continuously. We are looking for a Principal Engineer to play a critical leadership role across our engineering and architecture community. This is an opportunity to shape how we build, not just what we build—embedding effective engineering processes, modern delivery practices, and a culture of continuous improvement as the company scales. This role suits a senior technologist who thrives in ambiguity, enjoys influencing without authority, and wants to leave a lasting imprint on how engineering operates within a growing organisation. About the Opportunity As a Principal...

Principal Engineer – SC Eligible – Government Projects This role is delivered within secure environments. Candidates must be eligible for UK SC clearance and hold UK citizenship. Join the Mission We are a fast‑growing startup building scalable, high‑quality digital products at pace. Our success depends on strong engineering foundations, pragmatic architecture, and ways of working that enable teams to deliver value continuously. We are looking for a Principal Engineer to play a critical leadership role across our engineering and architecture community. This is an opportunity to shape how we build, not just what we build—embedding effective engineering processes, modern delivery practices, and a culture of continuous improvement as the company scales. This role suits a senior technologist who thrives in ambiguity, enjoys influencing without authority, and wants to leave a lasting imprint on how engineering operates within a growing...

We are seeking a highly experienced hands on Senior Technical Lead engineer to serve as the primary technical anchor for a large-scale Wealth Management Replatforming initiative. This individual will act as the strategic bridge between business stakeholders, enterprise architecture teams, and distributed engineering pods, driving the design and delivery of an AI-first platform ecosystem.   The ideal candidate will combine deep technical expertise across data, integration, cloud, and AI with strong stakeholder management capabilities and the ability to influence enterprise-wide technology decisions.     Key Responsibilities Technical Leadership Lead architecture, solution design, and technical governance across the replatforming program. Define and drive the target-state architecture spanning data, integration, AI, and customer platforms. Establish engineering standards, delivery practices, and architectural guardrails. Ensure...

An active SC Clearance is an essential requirement for this role, as a minimum you must be willing & eligible to undergo checks. (Please note, due to the exceptional requirements of this position (short-term nature of this role and speed at which we require a postholder in situ) preference may be given to candidates who meet all of the essential criteria and hold active security clearance.)    As a macOS Infrastructure Engineer you'll be instrumental in shaping the infrastructure and end user device capabilities that support vital services for The Cabinet Office, Government Commercial Authority (GCA) and the Government Property Agency (GPA), impacting civil servants and ministerial bodies across the nation.   You won't just be maintaining systems, you'll be working alongside Technical Architects and Principal Engineers, you'll design, maintain and upgrade our end user devices infrastructure, tackling challenges head on and ensuring seamless service...

6 month rolling contract London - 2 days onsite   Job Purpose The Principal Lead provides technical leadership across six engineering capabilities: SAP, DevOps, Domain Services, Storefront, iOS and Android. Working between the Capability Leads and the Architecture team, they provide hands-on technical leadership and design support as a full-stack engineer, and are accountable for raising engineering standards and defining, building and embedding best-of-breed practices that make secure software development and built-in observability the default. They also act as the senior point of technical escalation, taking the lead to resolve issues where Engineers, Technical Leads or Capability Leads are stuck.   The Principal Lead will also lead the introduction of agentic development practices across the engineering organisation, moving teams beyond AI code completion towards AI agents that plan, build, test and review changes under clear human oversight....

Windows Infrastructure & Microsoft 365 Engineer (Power BI / Microsoft Fabric) Contract 6+ Months(Inside IR35) Canary Wharf, UK Hybrid (2 days a week)   Role Overview We are seeking an experienced Windows Infrastructure & Microsoft 365 Engineer to support the delivery of a strategic Microsoft Fabric / Power BI platform . The role will design, build, and implement Windows Server-based Power BI Gateway infrastructure and associated Microsoft 365 services, ensuring secure, resilient, and scalable operations across production and non-production environments. Key Responsibilities Design and implement Windows Server 2022 infrastructure supporting Microsoft Fabric and Power BI. Develop Low-Level Designs (LLDs), build standards, implementation guides, and operational documentation. Deploy and manage highly available Power BI Gateway clusters across multiple data centers. Configure and administer Microsoft Entra ID, RBAC,...

Windows Infrastructure & Microsoft 365 Engineer (Power BI / Microsoft Fabric) Contract 6+ Months(Inside IR35) Canary Wharf, UK Hybrid (2 days a week)   Role Overview We are seeking an experienced Windows Infrastructure & Microsoft 365 Engineer to support the delivery of a strategic Microsoft Fabric / Power BI platform . The role will design, build, and implement Windows Server-based Power BI Gateway infrastructure and associated Microsoft 365 services, ensuring secure, resilient, and scalable operations across production and non-production environments. Key Responsibilities Design and implement Windows Server 2022 infrastructure supporting Microsoft Fabric and Power BI. Develop Low-Level Designs (LLDs), build standards, implementation guides, and operational documentation. Deploy and manage highly available Power BI Gateway clusters across multiple data centers. Configure and administer Microsoft Entra ID, RBAC,...

The role sits within the Enterprise Technology team in the Office of the Chief Technology Officer which supports Parliament in delivering its democratic mission by providing secure, resilient and innovative technology services that are user centred and strategically aligned.   The ServiceNow Principal Infrastructure Engineer is a hands-on technical authority and implementer for Parliament's ServiceNow platform, holding design authority for the platform and working directly on its most complex and highest-risk engineering. The role is embedded within value streams, establishing the engineering vision, technical standards and quality assurance framework that govern design, configuration, development and operation, and proving those standards in practice. The post-holder drives resilience and maturity by focusing on complex technical risk, architectural health, and leading the technical response to major problem domains.   Reporting to the Service Owner, you will...

Senior Delivery Manager - Appvia - Active UK Government Security Clearance required Internal Title: Senior Delivery Manager Location: London, UK (Hybrid - typically 1-2 days per week in office) Contract: Permanent or Contract Start Date: Immediate start (Early December) Package: £60,000 - £80,000 + 10% Bonus + 10% Shares + Benefits (see more below) Contract Day Rate: £600 Inside IR35   About Us Appvia is a specialist cloud, platform engineering, and AI enablement consultancy, helping organisations design, build, and operate modern cloud platforms at scale. We work across public and private sector organisations, delivering outcomes in complex and highly regulated environments. Our focus is on enabling teams to improve delivery performance, adopt modern engineering practices, and build secure, scalable platforms that support long-term change. Our work spans cloud migration, platform engineering, DevOps transformation, and...

About Red Badger We're a tech and product consultancy, building enterprise software products for blue-chip companies, multinationals and PLC's. The best bit about Red Badger is, of course, the team. We've been around for 15+ years now, and we are over 130 strong. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages. Headquartered in London, we also have offices in Cape Town and Leeds.     The Role As a Freelance Principal UX Researcher, you own research across a multi-team client programme. You run strategic discovery that shapes what gets built, set research standards, and make sure customer insight drives prioritisation. Our clients often have fragmented, siloed research that restarts with every study. You turn it into a working discipline. This is a working leadership role: part hands-on...

Principal Information Security Consultant (Day rate Contract) Contract Type Day Rate Contractor Closing Date 18 November, 2026 Job Category Tech, Data and Digital Business Unit Information Security & Privacy (UKTI) Location London, United Kingdom Posted on 19 October, 2026 Job Introduction Handelsbanken combines a long-established relationship banking model with secure, resilient, and customer-focused technology. Our technology teams enable the Bank's decentralised way of working, delivering systems built for stability, trust, and long-term value. We are on a multi-year technology and digital transformation journey to enhance customer experience and improve how colleagues work together. By modernising platforms, simplifying processes, and better connecting data and systems, we help relationship teams focus on customers and less on complexity. Our decentralised culture extends to technology. Teams are trusted to...