20 of 20 Part-Time Principal Engineer Jobs in the City of London

Principal Engineer London Hybrid £95,000-£110,000 + bonus + benefits We’re working with a rapidly growing tech for good company that is transforming how data, automation, and smart integrations shape the future of digital infrastructure. Their platform optimises real-time operations, connecting users with seamless … intelligent technology solutions. We are looking for Principal Engineer's with deep expertise in Kotlin or JVM to help scale and enhance their high performance systems. This is an opportunity to work with modern backend architecture, collaborating with top-tier engineers in a fast-moving, product-focused environment. … Responsibilities as a Principal Engineer: Contribute to the businesses technology strategy and architecture Contribute to the backend Kotlin infrastructure Ship resilient and well tested production code Collaborate with different teams to deliver value that aligns to business objectives Mentor and coach more junior members of the team Continuously More ❯

Principal Engineer – Build the Future of SME Finance Remote-first (UK-based) | London meetups | ️ Hands-on Architecture | Team Leadership | Fintech for Good We’re working with a mission-driven fintech that’s solving a massive problem: small businesses — the backbone of the UK economy — are still underserved by … using real-time financial data. Already trusted by 80+ major banks and lenders, they're scaling fast — and now they’re looking for a Principal Engineer to shape the next stage of their platform and lead from the front. Why This Role is Great You’ll architect the … Terraform) Practices: TDD, CI/CD, clean architecture, pragmatic testing Bonus Points: Data engineering or machine learning experience What They’re Looking For A Principal Engineer, Tech Lead, or Software Architect with at least 2 years at this level You’ve built and scaled SaaS platforms — ideally in More ❯

This leading developer of wireless communications technologies is urgently seeking a Principal Engineer 5G/6G RAN to be based at their R+D Centre in London. The Principal Engineer 5G/6G RAN will be involved in research and development of emerging 5G and 6G systems … relevant to 3GPP RAN wireless standards. Along with this the Principal Engineer 5G/6G RAN will be pivotal in driving next generation innovation and development addressing the challenges of future wireless systems development. The Principal Engineer 5G/6G RAN will also contribute to the More ❯

Principal Engineer | Hybrid | React | Node | AWS | TypeScript | £120k La Fosse has partnered with a global leader in customer loyalty and travel services. We're looking for Principal Engineers with a strong background in full-stack JavaScript development to join their growing team. As a Principal Engineer … two-stage virtual interview If this sounds like the next step in your engineering journey, we'd love to hear from you. Apply now! Principal Engineer | Hybrid | React | Node | AWS | TypeScript | £120k More ❯

Role: Principal Engineer Stack: Java, Kotlin, AWS Location: London, Hybrid (2-4x Month) Salary: Up to £120k-£140k Xcede are partnering with a FinTech Scale up who are building out a brand new SaaS platform integrating directly with major banking intuitions. What will you do as a … Principal Engineer? You will be leading architectural discussions and acting as the technical authority within the engineering function Collaborate with Product Managers and Engineers to optimise solutions Engage with clients to both gather requirements and understand problems that need to be solved Setting best practices and elevating capabilities … Typescript and AWS) Background building and designing large scale engineering platforms Comfortable working with both technical and non-technical stakeholders 3+ years as a Principal/Staff Engineer or Architect Dealt with clients in a commercial environment (consultancy, saas etc...) Preference for having worked within SaaS or FinTech More ❯

Principal Software Engineer – Cards & Credit (Python, Java, Clojure, AWS) Up to £135,000 + bonus (15-22%) + annual equity ️ Python, Distributed Systems, High-Scale Architecture London, hybrid working (2 days/week) Leading business lending platform I'm partnered with one of the UK’s most successful … new product line which has become the company’s highest-growth area, with its own dedicated leadership and roadmap. They’re now hiring a Principal Engineer to become the technical lead across two core engineering teams working in the card and credit space. This is a critical hands … their London office (no fixed days) Be part of a high-ownership role with real scope to shape the success of a growing product Principal Software Engineer – Cards & Credit (Python, Java, Clojure, AWS More ❯

Contract Role: Principal Engineer – ForgeRock (IAM) Location: London (Hybrid – 2 days onsite) Rate: Up to £800/day (PAYE) Duration: 6 months Start Date: 21 April 2025 IR35 Status: PAYE A leading financial services organisation is seeking a ForgeRock SME with deep expertise in IAM and application server More ❯

Principal Go (Golang) Engineer | Stealth Fintech | London (Min. 4 days/week onsite in London) Up to £200k + Equity | Hybrid London 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 Engineer specialising in Go to lead v1 builds, define architecture, and ship mission-critical backend systems from scratch. What you’ll do: Design & scale a fault-tolerant ledger (Golang … distributed, multi-region infra with five-nines reliability Lead backend, DevOps, and CI/CD decision-making Embed AI into engineering workflows & ops Strong engineer with system engineering & system architectural experience; exceptional communicator across technical and non-technical audiences. Self-motivated, problem-solving mindset; open to non-traditional backgrounds. More ❯

Principal Software Engineer - Java, Leadership - London (Hybrid) One of my consulting clients in London is looking for a Principal Software Engineer to lead a development team working on an exciting project. Key Skills: Java Development Springboot Microservices REST APIs Cloud (AWS Ideally or Azure) Leadership experience More ❯

Principal Software Engineer London (Bank – Three days a week in the office) £90k-£100k We’ve partnered with a global insurance company as they continue to grow their Engineering team – they’re seeking a Principal Software Engineer to lead & drive innovation & quality across the software development More ❯

Principal Data Engineer Hybrid - London – weekly office visit We’re working with a cutting-edge SaaS business that's revolutionising how organisations integrate systems, manage data, and deliver insights. This high-growth, product-led company offers a game-changing, AI-powered platform that’s driving digital transformation for … multiple awards for their approach to high achieving professionalism balanced with a great work-life balance. About the Role We’re looking for a Principal Data Engineer to join a highly skilled team focused on delivering next-gen, data-driven solutions across complex enterprise environments. We’re looking … to a Principal Technical Contributor who can also work in a strategic role. At it’s core, this role is about improving the company’s Product internally, while also listening to and tailoring for clients. You’ll act as a platform superuser and thought leader, responsible for designing and More ❯

Principal Machine Learning Engineer Paying between £100,000-£140,000 Hybrid in Central London La Fosse is partnered with a leading insurance company who are looking for an experienced Principal Machine Learning Engineer to drive their AI innovation at scale. They are looking for someone to … experience in the insurance or financial sector is beneficial. If you’re interested in this role, apply through the AD to find out more! Principal Machine Learning Engineer More ❯

Principal AI Engineer/Data Scientist Contract - inside IR35 London - hybrid £700-£900 inside IR35 (potential flex, focus in on the right person) Join a high-impact AI R&D team at a major financial player, where you'll be working at the cutting edge of LLMs and … similar cloud) and rapid prototyping mindset Front-end exposure (e.g. React) is a nice-to-have but not required If you're an experienced engineer or scientist with a strong background in Python and commercial AI experience get in touch. More ❯

Senior/Principal Python Engineer Front Office Technology £800-£850 inside IR35 (could flex for the right candidate) London - Hybrid We’re looking for a senior Python engineer to join the front office technology team of a major financial player on a long-term contract. The role 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 More ❯

power one of the world’s biggest financial platforms. Are you ready to make an impact that’s seen by hundreds of millions? As Principal DevOps Engineer, you’re not just maintaining systems you’re building the foundation for the future. Taking ownership of mission critical infrastructure, lead More ❯

I am looking for a Principal Back End Engineer (Node.js) to join a scaleup on a mission to transform UK healthcare with their innovative FinTech solutions. At a time when the healthcare system is evolving rapidly, you would be pivotal in building products that focus is on accessibility More ❯

We are currently recruiting for a global enterprise software provider for the role of Principal Solution Engineer. This is an exciting role that combines cutting-edge technology with strategic client engagements to shape impactful ERP solutions. Role Overview *Candidates must be based in the UK* Location: Remote with occasional More ❯

Job Title: Site Reliability Engineer (SRE) – High-Frequency Trading Infrastructure Location: Onsite – New York City, London, or Singapore Our Client, a leading high-frequency trading firm, is seeking a Site Reliability Engineer (SRE) to architect and build next-generation production tools and infrastructure for their ultra-low-latency More ❯

their founding UK team as they continue their growth here, with a cracking office in one of London's iconic buildings. Job Titles: DevOps Engineer (Senior Level and Above) Salary: Please let me know your salary expectations. Location: London (Hybrid, 3 days on-site) Industry: Software/Financial (FinTech … mentorship and technical guidance to DevOps and development teams, fostering a culture of continuous learning and improvement. If you are an highly experienced DevOps engineer looking for a new opportunity and interested then Apply More ❯