51 to 75 of 108 Principal Software Engineer Jobs in London

Principal Engineer – ClimateTech | Tech Strategy for a New Platform London – 1 day a week Up to £130,000 plus stock Typescript | Python | GraphQL | AWS Principal Engineer – We have been exclusively engaged by a leading ClimateTech business to hire a Principal Engineer who will provide key strategic direction for their growth plans in 2024. The … Principal Engineer will report to the CTO and be responsible for shaping the technical roadmap for their platform which provides petabyte volumes of data for genuine climate impact. The Principal Engineer will be their first hire at this level, providing technical leadership to an Engineering function of approximately 40 Engineers across Software, Data and SRE. … although, given the importance of the role, it would be expected that you’d come to the office so you need to be commutable to London. What will the Principal Engineer do? The role will broadly has three facets: You will provide architectural oversight around APIs, Data and Infrastructure, prioritising domain-driven design to align technical decisions with More ❯

Social network you want to login/join with: Principal Java Software Engineer, london col-narrow-left Client: Fynity Location: london, United Kingdom Job Category: Other - EU work permit required: Yes col-narrow-right Job Views: 1 Posted: 23.05.2025 Expiry Date: 07.07.2025 col-wide Job Description: Principal Java Software Engineer London (Hybrid … days/week onsite) ? Join a FinTech Powering the Future of Payments Are you an experienced Senior/Principal Java Software Engineer who thrives in a fast-paced, agile environment? Passionate about high-throughput, real-time systems? This is your opportunity to help shape the core technology that powers instant payments for some of the world’s …/week in a London office ? Opportunity to collaborate with major global banks ? Fast-paced, product-led environment where your voice matters If you're a motivated Senior/Principal Engineer ready to tackle complex challenges and deliver meaningful change, hit apply – and shape the future of payments with us. #J-18808-Ljbffr More ❯

Social network you want to login/join with: Principal Java Software Engineer, south west london col-narrow-left Client: Fynity Location: south west london, United Kingdom Job Category: Other - EU work permit required: Yes col-narrow-right Job Views: 4 Posted: 26.06.2025 Expiry Date: 10.08.2025 col-wide Job Description: Principal Java Software Engineer London (Hybrid – 1–2 days/week onsite) ? Join a FinTech Powering the Future of Payments Are you an experienced Senior/Principal Java Software Engineer who thrives in a fast-paced, agile environment? Passionate about high-throughput, real-time systems? This is your opportunity to help shape the core technology that powers instant payments for …/week in a London office ? Opportunity to collaborate with major global banks ? Fast-paced, product-led environment where your voice matters If you're a motivated Senior/Principal Engineer ready to tackle complex challenges and deliver meaningful change, hit apply – and shape the future of payments with us. #J-18808-Ljbffr More ❯

Senior Software Engineer, Python, AWS, Postgres, COR7231 Are you a skilled Senior Software Engineer with strong Python expertise and a passion for solving complex technical challenges? We’re looking for a Senior Software Engineer who’s seeking a tough, complex and highly rewarding technical challenge. We require a Senior Software Engineer who … incredible ambition. This is a start-up opportunity not to be missed... A chance to build something that matters and has impact! The Role This is an exciting Senior Software Engineer role at a rapidly scaling AI-focused company whose mission is both economically and environmentally motivated. The Senior Software Engineer will work to bring to … system architecture and working on projects end to end Strong academic background in Computer Science Proficiency with Postgres and AWS So What’s Next? If you’re a Senior Software Engineer looking for a fully hands-on, high-impact role in a mission-driven AI company, apply now for immediate consideration! Senior Software Engineer, Python, AWS More ❯

Principal Java Software Engineer London (Hybrid – 1–2 days/week onsite) Join a FinTech Powering the Future of Payments Are you an experienced Senior/Principal Java Software Engineer who thrives in a fast-paced, agile environment? Passionate about high-throughput, real-time systems? This is your opportunity to help shape the core …/week in a London office Opportunity to collaborate with major global banks Fast-paced, product-led environment where your voice matters If you're a motivated Senior/Principal Engineer ready to tackle complex challenges and deliver meaningful change, hit apply – and shape the future of payments with us. More ❯

Principal Java Software Engineer London (Hybrid – 1–2 days/week onsite) 🚀 Join a FinTech Powering the Future of Payments Are you an experienced Senior/Principal Java Software Engineer who thrives in a fast-paced, agile environment? Passionate about high-throughput, real-time systems? This is your opportunity to help shape the core …/week in a London office 🌍 Opportunity to collaborate with major global banks 🚀 Fast-paced, product-led environment where your voice matters If you're a motivated Senior/Principal Engineer ready to tackle complex challenges and deliver meaningful change, hit apply – and shape the future of payments with us. More ❯

Principal Software Engineer | Node | TypeScript | APIs | AI | Greenfield | AWS | Microservices | £110,000-£115,000 + 15% Discretionary Bonus + Benefits Method Resourcing is thrilled to be partnering with a global leader in the travel services and benefits sector. They're looking for a Principal Software Engineer to drive innovation and drive forward greenfield functionality … as the company dives into AI. The role: As a Principal Engineer, you will take charge of a newly launched greenfield project, leading its technical development from the ground up. This is a rare opportunity to create a modern, scalable system using the latest technology. Your role will involve defining the architecture, making crucial technical decisions, and supporting … apply today or send your CV to . Please note: My client cannot offer sponsorship and can only accept candidates with the right to work in the UK . Principal Software Engineer | Node | TypeScript | APIs | AI | Greenfield | AWS | Microservices | £110,000-£115,000 + 15% Discretionary Bonus + Benefits RSG Plc is acting as an Employment Agency More ❯

T24 Principal Software Engineer Location: London - Hybrid 3 days a week in the office Duration: Initially 6 months Rate: £market rate The company: Global Technology company delivering digital transformation to a financial services end client. The knowledge, experience and qualifications you need Wide, detailed, and up-to-date experience of the technologies and tools in your area. … Plenty of experience in the full lifecycle of developing software from the first idea to the final execution Mandatory to have L3 code development skills with hands-on experience. TAFJ knowledge and code library management experience. Local code development skill using Info Basic and TAFJ componentized codes. In-depth Technical knowledge of T24 Customization and OFS processing. Linux basics. … Agile delivery experience, especially around discovering requirements and preparing user stories. A good understanding of testing approaches and putting testability at the heart of software design and development. The ability to establish relationships with stakeholders at all levels A good understanding of system integration patterns and associated technologies. Excellent written and spoken English, and communication skills to help manage More ❯

with your recruiter to learn more. Base pay range Direct message the job poster from Fynity Senior Delivery Consultant @ Fynity, placing highly skilled talent within the cloud technology sector ️ Principal Java Software Engineer London (Hybrid – 1–2 days/week onsite) Join a FinTech Powering the Future of Payments Are you an experienced Senior/Principal Java Software Engineer who thrives in a fast-paced, agile environment? Passionate about high-throughput, real-time systems? This is your opportunity to help shape the core technology that powers instant payments for some of the world’s largest financial institutions. We’re hiring on behalf of a leading payments consultancy, delivering cutting-edge solutions that integrate …/week in a London office Opportunity to collaborate with major global banks Fast-paced, product-led environment where your voice matters If you're a motivated Senior/Principal Engineer ready to tackle complex challenges and deliver meaningful change, hit apply – and shape the future of payments with us. Seniority level Seniority level Mid-Senior level Employment More ❯

Principal Software Engineer, Amazon Cross Border Tech The Amazon Cross Border Core Technology team is seeking a seasoned Principal Engineer to drive the development of innovative technologies that will shape platforms and products impacting a multi-billion-dollar business and enhancing the global customer experience. Our team is focused on building next-generation services that … technologies to support shoppers worldwide. Innovating strategies for global expansion and developing solutions that will sustain the continued rapid growth of this thriving business. Key job responsibilities As a Principal Engineer you will be expected to serve as a technical lead on our most demanding, cross-functional projects. Ensure the quality of architecture and design of systems. Functionally … for the benefit of our region. Collaborate with the business teams to identify opportunities and innovate on behalf of our customers. BASIC QUALIFICATIONS Bachelor's degree 10+ years of software engineering with a proven track record of leading large-scale projects experience Experience in complex software development and knowledge of emerging platforms, Java, operating system principles, and programming More ❯

Python Engineer - (Front Office) £800-£900/day (Inside IR35) | 6-month rolling contract | Hybrid (3 days in office) | London A major financial player is hiring a hands-on Python engineer to support one of their front office quant focused investment teams. This is a front-office aligned role within technology, partnering directly with quants and traders to … libraries like pandas and NumPy Experience working in front office environments Familiarity with data pipelines and cloud infrastructure Pragmatic, detail-oriented, and able to work independently Experienced Python-focused Software/Data Engineer with a front office background and experience working with quants? Apply now for a fast turnaround. This is an initial 6-month contract with strong More ❯

Python Engineer - (Front Office) £800-£900/day (Inside IR35) | 6-month rolling contract | Hybrid (3 days in office) | London A major financial player is hiring a hands-on Python engineer to support one of their front office quant focused investment teams. This is a front-office aligned role within technology, partnering directly with quants and traders to … libraries like pandas and NumPy Experience working in front office environments Familiarity with data pipelines and cloud infrastructure Pragmatic, detail-oriented, and able to work independently Experienced Python-focused Software/Data Engineer with a front office background and experience working with quants? Apply now for a fast turnaround. This is an initial 6-month contract with strong More ❯

Ripjar specialises in the development of software and data products that help governments and organisations combat serious financial crime. Our technology is used to identify criminal activity such as money laundering and terrorist financing, and enables organisations to enforce sanctions at scale to help combat rogue entities and state actors. Team Mission Ripjar’s Engineering team builds software … KYC Solutions. We continue to innovate at pace the compliance sector, pioneering the responsible use of AI with our Digital Assistant .. What you'll be doing As a Principal Engineer, you’ll provide technology leadership and architectural oversight to our product and platform engineering teams. As a senior technologist you’ll be central to Ripjar’s technical … CTO. You’ll work closely with senior leaders and colleagues across the organisation, and you’ll play a key role in collaborating with our customers and partners. As an engineer with breadth and depth of experience you’ll be in your element designing and delivering scalable software in the cloud and on-premise, articulating software designs and More ❯

Social network you want to login/join with: Principal Software Development Engineer, London col-narrow-left Client: AJ Bell Location: London, United Kingdom Job Category: Other - EU work permit required: Yes col-narrow-right Job Reference: Job Views: 4 Posted: 29.06.2025 Expiry Date: 13.08.2025 col-wide Job Description: Job Description We are a technology-driven company … building high-performing, scalable, and resilient software solutions. Our teams work with a modern tech stack including .NET, MongoDB, AWS, Jenkins, SQL Server, and streaming technologies. We’re looking for a hands-on Principal Engineer who can code, design scalable systems, manage Staff Engineers, and drive technical excellence across multiple teams. This role is perfect for a … technical leader who still enjoys writing code while shaping architecture and mentoring engineers. About the role As a Principal Engineer, you will play a critical role in: Architecting scalable, high-performance systems Coding and reviewing mission-critical features (at-least 60% hands-on) Managing and mentoring Staff Engineers & Senior Developers Driving best practices in software development and More ❯

Social network you want to login/join with: Principal Software Development Engineer - Quote API, London Location: London, United Kingdom Job Category: Other EU work permit required: Yes Job Reference: 4b46f6c446a1 Job Views: 53 Posted: 24.06.2025 Expiry Date: 08.08.2025 Job Description: Tesco UK • Welwyn Garden City • Hybrid • Full-Time • Apply by 29-May-2025 About the role More ❯

Knowledge, skills and experience required Tech stack We use TypeScript (Node.js & React), AWS (EKS, Lambda, Aurora RDS), Kubernetes, and GraphQL. You’re comfortable with all of these and have extensive knowledge of JavaScript more generally, the AWS ecosystem, and running More ❯

Social network you want to login/join with: Principal Software Engineer - Technology Rates & FX, London col-narrow-left Client: Location: London, United Kingdom Job Category: Other - EU work permit required: Yes col-narrow-right Job Reference: 6a66dd017d94 Job Views: 3 Posted: 29.06.2025 Expiry Date: 13.08.2025 col-wide Job Description: The TP ICAP Group is a world … people strong. We work as one to achieve our vision of being the world’s most trusted, innovative, liquidity and data solutions specialist. Role Overview As a Principal Software Engineer at TP ICAP you will be part of a talented team delivering business critical software for the internal broking division and their external customer base. You … integration and deployment. Role Responsibilities Lead and manage a cross-functional team of engineers working on innovative Front Office solutions for our Rates & FX business lines Work closely with principal engineers in other regions to set and implement standards for engineering excellence Work closely with Solution Architects and Enterprise Architecture to build solutions that align to the IT strategy More ❯

and downstream services such as advisor platforms, custodians, and alternative processing engines Mentor engineers in APL architecture, domain concepts, and test-first practices What You Bring 7+ years of software development experience, including 5+ years in Dyalog APL (or a similar dialect) Deep understanding of managed accounts trading and operations , including model management, order generation, post-trade processing, and … Track record of working with legacy financial codebases and introducing testability, clarity, and structure Proficiency in developing and maintaining unit, integration, and regression tests in APL Familiarity with modern software lifecycle tools (Git, Jira, Jenkins, etc.) Strong collaboration and communication skills across technical and business-facing teams Nice to Have Experience working with custodians, model providers, or Turnkey Asset More ❯

Tech Principal Location: London, United Kingdom Type: Full-Time (hybrid working – home and central office) This is a hands-on leadership role with significant influence across DevOps, architecture design, database integration, team management, and product direction. You will coordinate a rapidly growing engineering team and play a pivotal role in enabling scalable, high-performance solutions that support the firm … frontend (e.g., TypeScript, React) technologies. Strong understanding of modern database technologies and integration patterns. Familiarity with CI/CD pipelines, containerization, and serverless architecture. Professional Experience 6+ years in software engineering, including leadership and architectural responsibilities. Experience managing agile cross-functional teams. Background in SaaS platform development; experience in sustainability or ESG domains is a plus. Soft Skills Strong More ❯

Tech Principal Location: London, United Kingdom Type: Full-Time (hybrid working – home and central office) This is a hands-on leadership role with significant influence across DevOps, architecture design, database integration, team management, and product direction. You will coordinate a rapidly growing engineering team and play a pivotal role in enabling scalable, high-performance solutions that support the firm … frontend (e.g., TypeScript, React) technologies. Strong understanding of modern database technologies and integration patterns. Familiarity with CI/CD pipelines, containerization, and serverless architecture. Professional Experience 6+ years in software engineering, including leadership and architectural responsibilities. Experience managing agile cross-functional teams. Background in SaaS platform development; experience in sustainability or ESG domains is a plus. Soft Skills Strong More ❯

Principal Software Development Engineer in Test (SDET) UK - London Principal Software Developer in Test (SDET) Why Join Capco? Capco is a global technology and business consultancy, focused on the financial services sector. We are passionate about helping our clients succeed in an ever-changing industry. You will work on engaging projects with some of the More ❯

levels to better scout, recruit, teach, and win. WE WANT PEOPLE WHO ARE PASSIONATE ABOUT BUILDING STATE OF THE ART TECHNOLOGY We are looking for a talented and inquisitive Principal Software Engineer - Team Lead whose drive for learning and determination for continuous improvement aligns with our ambitious, fast-growing and transforming company. Based in London, you will … team. We believe that our customers deserve the best platform and we are on a mission to maximise and enhance their performance through delivering a high-quality experience. Our software engineers match this ethos by taking responsibility for constantly improving productivity and development of self and be able to excel in a fast-paced environment with your short project … and designing successful C++ products, with 5+ years as a senior or lead. Strong experience with Qt/QML for multi-platform development Proven experience utilising and advocating for software engineering best practices such as agile software development methodologies, test-driven development, CI/CD, and DevOps Strong understanding object-oriented design skills and of design for scalability More ❯

Lead/Principal Software Engineer (DV Cleared) Cheltenham £75,000 - £105,000 plus bonuses and great benefits I'm working closely with one of the World’s leading technology companies, a true global leader in Defence and Intelligence, helping them grow their cyber security and software engineering teams. As the business continues to grow their already … significant UK Cyber Security presence, I’m helping them search for their next Lead and Principal Software Engineers in Cheltenham. Using modern software development practices, the company designs and develops state of the art solutions, builds and maintains critical platforms and infrastructure, that powers the services they provide. As a Lead or Principal Engineer, you … delivery of these cutting-edge projects. Essential skills Hands on experience with Java, JavaScript or Python Knowledge of cloud architecture, ideally with AWS or Azure Experience designing and architecting software solutions Previous experience leading teams of software engineers If you’re a Lead Software Engineer, looking for that next step or a Principal Engineer More ❯

Job Description Principal Software Development Engineer/Data Architect Oxfordshire, England Initial 12 Daily Rate Contract Contract due to start August/September Overview: We're hiring a Principal Software Development Engineer on behalf of a leading biotech client to oversee the configuration, validation, and lifecycle support of critical lab systems. This role combines … software engineering expertise with architectural ownership across digital quality systems. Key Responsibilities: Lead technical configuration and validation of laboratory and EHS systems in a GxP environment. Oversee authoring and review of system lifecycle documents including system configurations, SOPs, risk assessments, and test protocols. Act as a digital administrator and technical lead for lab systems, ensuring compliance and system performance. More ❯

Principal Software Engineer – 100% Remote (anywhere in the world), London Client: Oxford Knight Location: London, United Kingdom Job Category: Other Online job hunting tools - EU work permit required: Yes Job Reference: 159197d6ccba Job Views: 6 Posted: 02.06.2025 Expiry Date: 17.07.2025 Job Description: Compensation: Highly competitive in this field Summary Unique opportunity for an experienced engineer in … individual with experience in technical leadership, in both a strategic and team management capacity. With huge amounts of autonomy, you will make key contributions to the firm’s core software strategy, taking ownership of key infrastructure. You’ll be responsible for executing the roadmap, working with the infrastructure team to improve tooling with a view to improving productivity. Alongside … this, you’ll lead a team of talented engineers, setting software engineering best practices and drawing on your talent for coaching and mentoring other. You’ll also be involved in the hiring and deciding the direction of the team. Online job hunting tools Requirements Substantial experience of software development – Python ideal, but any OO will be considered Very More ❯