11 of 11 Principal Software Engineer Jobs in the City of London

Principal Software Engineer Salary: Up to £100k + Bonus Location: Central London - Once a Fortnight Tech Stack: Python/Vue/TypeScript/GCP or AWS Cloud Are you a product-driven Software Engineer who cares about the why behind what you build? Do you thrive on shaping technical direction, driving innovation, and delivering solutions … that make a real impact for customers? This is a rare chance to join a London-based AI & Data software company backed by significant investment and global ambition. They’re hiring multiple Principal Software Engineers to play a pivotal role in the evolution of their products. You’ll work hands-on within cross-functional teams, influencing both … product and technical direction, while leveraging modern web technologies, cloud platforms, and strong engineering practices. What they're looking for in a Principal Software Engineer: Proven expertise in Python (Django), TypeScript (Vue.js), serverless cloud platforms, and MongoDB A product-first mindset — curious, proactive, and always looking for ways to improve and innovate Experience working in cross-functional More ❯

Principal Engineer - Python, AWS, React, Microservices OB have exclusively partnered with an AI Consulting firm who work with enterprise scale clients to transform them into AI & Data transformed businesses. Knowing how AI can transform enterprise scale companies, they are looking to bring in a number of highly skilled Principal Level Engineers to their team, to work on … many more. The roles will be heavily weighted toward the Backend (80/20), but you will be expected to work across the Frontend and with Cloud-native Architectures. Principal Engineer - Python, AWS, React, Microservices Principal Engineer: 8+ years of commercial experience Experience guiding multiple teams and helping set technical direction My have strong demonstrated knowledge … working A Consulting background will be highly advantageous Pays £120k-£135k - + discretionary bonus + excellent benefits package Hybrid working with 3-days a week required in London offices Principal Engineer - Python, AWS, React, Microservices More ❯

Principal Software Engineer Location: London - 1x a month Salary: £95,000 - £120,000 + equity + benefits An established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation digital solutions. This is an opportunity to shape greenfield projects from … reliability, and performance. Partner closely with engineering leadership to define best practices, coding standards, and long-term technical strategy. Design, develop, and oversee the delivery of robust, production-grade software built using Python, Django, Cloud Firestore, BigQuery, and Elasticsearch. Mentor and guide engineers at all levels, fostering a culture of technical excellence and continuous improvement. Collaborate with cross-functional … with business priorities to deliver scalable, maintainable solutions. What do I need to be successful? Degree in Computer Science or equivalent hands-on experience. 7+ years' experience in backend software development, including several years in a senior or principal-level engineering role. Expertise in Python (or a similar backend language), with proven experience designing distributed systems, APIs, and 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. … 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. … 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 Join a once in a career opportunity to help build a premium private bank from the ground up. Which is currently in stealth mode , backed by significant capital and led by a visionary team. With mobilisation underway, we’re assembling a lean, elite engineering team to architect and deliver a secure, scalable, multi-cloud … banking platform using modern technologies. This is a career-defining role for a polyglot engineer with deep expertise in Rust and Python , and a passion for building robust systems in highly regulated environments. What You’ll Do Design and build core banking services and infrastructure using Rust , Python , and other modern languages. Develop secure, scalable systems across AWS and 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 … 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 … 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 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 … deliver on their individual responsibilities and ensure that the Front Office desks are fully supported with a global system architecture. Responsibilities: Design, develop, and maintain high-quality Java-based software components for trade capture, pricing, risk calculation, payments, settlements, and regulatory reporting Develop scalable and accurate solutions to meet the evolving needs of our business Be a part of … the global Level 3 support team, providing on-call support and responding to pager duty alerts Follow and improve established Software Development Life Cycle (SDLC) processes Automate tasks in the Continuous Integration/Continuous Delivery (CI/CD) pipeline to improve efficiency and reduce errors Qualifications: Bachelor's degree in Computer Science, Mathematics, Physics, Engineering, or a similar field 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 … deliver on their individual responsibilities and ensure that the Front Office desks are fully supported with a global system architecture. Responsibilities: Design, develop, and maintain high-quality Java-based software components for trade capture, pricing, risk calculation, payments, settlements, and regulatory reporting Develop scalable and accurate solutions to meet the evolving needs of our business Be a part of … the global Level 3 support team, providing on-call support and responding to pager duty alerts Follow and improve established Software Development Life Cycle (SDLC) processes Automate tasks in the Continuous Integration/Continuous Delivery (CI/CD) pipeline to improve efficiency and reduce errors Qualifications: Bachelor's degree in Computer Science, Mathematics, Physics, Engineering, or a similar field More ❯

Be part of HL's future. Be part of the future of investing. Shape it with us. What You'll Be Doing Building and deploying scalable, secure, and compliant software at pace. Integrating HL web and mobile apps with existing and new systems to deliver a seamless client experience across a range of products and services. Delivering value iteratively … outcomes with HL's mission and client value. Championing a culture of continuous learning, cross-functional collaboration, and inclusivity with a growth mindset. About You 8-10 years of software development experience within large-scale, regulated environments - ideally in Investment, Asset or Wealth Management. Solid experience in building and deploying frontend applications in React or React Native with hands …/TypeScript JavaScript/iOS (Swift) or Android (Kotlin) RDBMS (Oracle/Sybase)/NoSQL databases (Document DB) AWS and cloud-native microservices containerised architecture (e.g. K8s, Docker) Modern software engineering practices with CI/CD pipelines and DevOps principles TDD/BDD testing frameworks Desirable Java (21) and Spring Boot Interview Process 3 Stage Interview Stage 1 - Discussion More ❯

Be part of HL's future. Be part of the future of investing. Shape it with us. What You'll Be Doing Building and deploying scalable, secure, and compliant software at pace. Integrating HL web and mobile apps with existing and new systems to deliver a seamless client experience across a range of products and services. Delivering value iteratively … HL's mission and client value. Championing a culture of continuous learning, cross-functional collaboration, and inclusivity with a growth mindset. About You 8-10 years of experience in software engineering , with a strong track record of delivering complex, user-facing applications in regulated, large-scale environments , ideally within Investment, Asset, or Wealth Management . Deep expertise in React More ❯