35 senior software engineer jobs found in London

End Date Saturday 20 June 2026 Salary Range £76,760 - £115,140 We support flexible working – click here for more information on flexible working options Flexible Working Options Hybrid Working, Job Share Job Description Summary . Job Description Job Title: Senior Software Engineer – Golang Location: London Salary: £76,760 - £95,950 Hours:  Full time Working Pattern : Our work style is hybrid, which involves spending at least two days per week, or 40% of our time, at one of our office sites. Colleagues with disabilities can be supported with workplace adjustments including hybrid working expectations in line with our Flexibility Works policy.  What you’ll be doing… As a Backend Software Engineer, you’ll support the build of elegant, performant, maintainable, operable, and secure Golang microservices. You’ll help design and architect our systems, contribute to continuous improvement, and play a key role in making the engineering...

End Date Saturday 20 June 2026 Salary Range £76,760 - £115,140 We support flexible working – click here for more information on flexible working options Flexible Working Options Hybrid Working, Job Share Job Description Summary . Job Description Job Title: Senior Software Engineer – Mobile (iOS) Location: London Salary: £76,760 - £95,950 Hours:  Full time Working Pattern : Our work style is hybrid, which involves spending at least two days per week, or 40% of our time, at one of our office sites. Colleagues with disabilities can be supported with workplace adjustments including hybrid working expectations in line with our Flexibility Works policy.  What you’ll be doing… In this role, you’ll partner with a cross-functional team to design, build and ship small, high-quality features, using strong iOS engineering skills to deliver innovative, customer-facing experiences. Along the way, you’ll sweat the details, spot opportunities to add...

Team Overview XiP is building a next-generation cross-asset calculation system for Citi trading desks and enterprise users in the largest global financial markets and exchanges in New York, London, and other major financial hubs. Our team owns multiple Java Spring Boot Services that execute, partition, and track quantitative risk graphs/trades in a distributed environment. These graphs can fail due to their complexity and our system must adapt quickly to these failures to provide a seamless experience for clients.  XiP Compute Services are deployed onto OpenShift and Amazon’s Elastic Kubernetes Service (EKS). An important initiative in 2025 will be onboarding Google’s Kubernetes Engine to further expand our coverage. Our system scales on-demand, and we can run up to tens of thousands of replicas of our services across all asset classes.  Role Overview We are seeking a Senior Engineer to fill the role of ‘Applications Development Technology Lead Analyst’ on the...

ABOUT US: LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. It’s how we’ve contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services – and our open-access model – we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity. LSEG is headquartered in the United Kingdom, with significant operations in 70 countries across EMEA, North America, Latin America and Asia Pacific. We...

The Senior Software Engineer is a hands-on individual contributor responsible for designing, building, and operating mission‑critical FX market infrastructure and matching platforms using C++ and Java. The role focuses on low‑latency, high‑throughput distributed systems with strict availability, resiliency, and data integrity requirements. This role owns technical outcomes for complex components and services, influences architecture and platform evolution, and provides deep expertise across development, testing, and production support. While not a line‑management role, it carries strong expectations for technical leadership, mentoring, and collaboration across engineering, architecture, and product teams. Key Responsibilities Design, develop, and maintain C++ and Java services supporting FX matching and trading workflows. Own technical delivery for key platform components, ensuring alignment with LSEG architectural principles, performance standards, and operational...

Role Purpose We are looking for a Senior Software Engineer who will lead a product-focused engineering team, collaborating with a Product Owner, business stakeholders, and third-party partners. The position is crucial in IT Development, involving team leadership, solution delivery, and technical guidance, particularly in finance and operations systems. The ideal candidate is a technically skilled leader, passionate about mentoring engineers, driving delivery, and working hands-on with a Microsoft-based technology stack. Requirements Key Responsibilities   Lead a team of software engineers aligned to the Finance Automation team (Automation and Insights) product squad. Take ownership of technical delivery across both internal development and third-party suppliers, ensuring quality, timeliness, and alignment with business goals. Collaborate closely with business stakeholders across Finance, IT, and Operations. Ensure high standards of software design, development,...

FTSE Russell | LSEG Technology FTSE Russell is a leading global provider of financial services, specializing in the creation and management of indexes, data, and analytic solutions. A subsidiary of the London Stock Exchange Group (LSEG), FTSE Russell supports investors worldwide in making informed decisions across asset classes, investment strategies, and market segments. Its products are trusted by institutional and retail investors, asset managers, and pension funds to benchmark performance, build investment portfolios, and manage risk. With a reputation for innovation, transparency, and robust governance, FTSE Russell plays a critical role in shaping global financial markets. Job Summary: FTSE Russell is seeking a senior software engineer to be part a dynamic team of software engineers building all distribution capabilities of our index products to the financial community worldwide. The distribution platform encompasses the set of systems delivering our indexes to the...

Engineer the future of global finance. At Citi, our Tech team doesn’t just support finance – we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech . As an Engineering Manager you will improve the productivity of engineers, create effective reporting mechanisms, and ensure timely and budget-conscious completion of work within the Site Reliability Engineering (SRE) team. You will play a crucial role in driving operational excellence, fostering...

At Citi, we are pioneering the future of enterprise operations through innovative technology. Our COO-Technology Engineering and Architecture capability is at the forefront, responsible for architecting best-in-class solutions, driving end-to-end transformation, and integrating cutting-edge Generative AI solutions to unlock unparalleled efficiency, automation, and risk reduction across our global operations. The Team: Innovating at Scale Our team is a dynamic hub of engineers and innovators dedicated to solving complex business challenges with intelligent solutions. We believe in building robust, scalable products that deliver tangible impact. We foster an environment of continuous learning, rapid iteration, and strong engineering practices. Here, you'll work alongside passionate experts, leverage the latest in AI, and contribute to a culture that values clean code, thoughtful design, and direct, hands-on problem-solving. We're not just adopting AI; we're building the...

End Date Friday 12 June 2026 Salary Range £84,624 - £126,936 We support flexible working – click here for more information on flexible working options Flexible Working Options Hybrid Working, Job Share Job Description Summary . Job Description JOB TITLE:   Lead Software Engineer SALARY: £84,624 - £105, 780 LOCATION(S): London HOURS: Full-time WORKING PATTERN : Our work style is hybrid, which involves spending at least two days per week, or 40% of our time, at one of our office sites. Colleagues with disabilities can be supported with workplace adjustments including hybrid working expectations in line with our Flexibility Works policy.  What you’ll be doing We’re looking for a Lead Software Engineer to join our Enterprise & Accounting Lab to develop and deliver innovative payment solutions and services for our customers and business. The Enterprise & Accounting Lab delivers and supports accounting, reconciliation, and...

ABOUT US: LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. It’s how we’ve contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services – and our open-access model – we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity. LSEG is headquartered in the United Kingdom, with significant operations in 70 countries across EMEA, North America, Latin America and Asia Pacific. We employ...

Core Engineering Java Development Lead – FX Tech (SVP) Engineer the future of global finance. At Citi, our Tech team doesn’t just support finance – we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech. This is a hands-on role for a Java expert who enjoys building high-quality robust and scalable services, shaping technical direction, and working with modern event-driven architectures. You'll play a key role in designing, building and evolving...

Engineer the future of global finance. At Citi, our Tech team doesn’t just support finance – we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech . Join the Technology Application Strategy team, where we empower Citi's global developer community to build better, faster, and with greater satisfaction. We are a dynamic and globally distributed team of passionate technologists across London, Belfast, and the US, dedicated to designing, building, and...

LSEG and Microsoft have entered an exciting strategic partnership for the development of next-generation data, analytics and cloud infrastructure solutions. Our customers’ needs are evolving and so are financial markets. This partnership will transform the way customers discover, analyse and trade securities around the world. It will also advance our cloud strategy and build the improved resilience, efficiency and agility that our customers need. All of Microsoft’s customers will also have access to our data and analytics capabilities through a single flexible infrastructure that is intuitive and responsive. If you are interested in being a part of this dynamic strategic partnership, we look forward to considering your skills and experience. ROLE PROFILE: The Tech Lead, Quantitative Analytics Engineering (AI/LLM Focus) will lead a high-performing team of quantitative analytics and AI engineers, driving the design, development, and delivery of next-generation Analytics and...

This is an individual contributor role responsible for the design, development, and delivery of high‑quality software solutions using C++ and Java within a defined product, platform, or client solution area. The role emphasizes hands‑on engineering, strong ownership of medium‑to‑large technical components, and adherence to established architectural and engineering standards. The engineer collaborates closely with senior engineers, architects, product managers, and delivery teams to implement technical changes that improve business and client outcomes. While not an architect or people manager, the role requires strong technical judgment, mentoring of junior engineers, and meaningful contribution to solution design and delivery excellence. Key Responsibilities Design, develop, and maintain C++ and Java applications and services, delivering robust, performant, and maintainable solutions. Implement technical changes and enhancements that improve platform stability,...

LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a commitment to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. It’s how we’ve contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years.  The  Optimisation CoreTech Strats  team builds the systems that sit at the heart of Quantile’s client services. As a large, diverse, and highly collaborative engineering team, we are responsible for designing and delivering the infrastructure, applications, and data pipelines that allow financial institutions to securely submit risk and trade data to Quantile.  The Role   We are looking for a...

Senior Java Developer Business Unit: FTSE Russell – Index Platform Company: London Stock Exchange Group (LSEG) About Us LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. It’s how we’ve contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services – and our open-access model – we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity. LSEG is headquartered in the United...

ABOUT US: LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. It’s how we’ve contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services – and our open-access model – we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity. LSEG is headquartered in the United Kingdom, with significant operations in 65 countries across EMEA, North America, Latin America and Asia Pacific. We employ...

ABOUT US: LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. It’s how we’ve contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services – and our open-access model – we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity. LSEG is headquartered in the United Kingdom, with significant operations in 70 countries across EMEA, North America, Latin America and Asia Pacific. We employ...

ABOUT US: LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. It’s how we’ve contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services – and our open-access model – we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity. LSEG is headquartered in the United Kingdom, with significant operations in 70 countries across EMEA, North America, Latin America and Asia Pacific. We employ...