35 senior software engineer jobs found in London

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.     What We do /   The   Team : Markets Operations Technology is   going through a n   exciting phase of transformation in margin and collateral domain .   We are re ‑ engineering our technology estate to achieve world ‑ leading performance and resiliency,...

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...

End Date Wednesday 25 November 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: Mobile Software Engineer - 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 extra...

As the world’s most global bank, Citi gives you the tools to be a trailblazer. We’re not just building technology; we’re building the future of banking. With thousands of employees located around the globe, we are an international team encompassing a broad range of teams, roles, and cultures, and we invite you to come and join us!   Citi’s technology team supports business operations in 100+ countries, across multiple lines of business spanning both Institutional and retail businesses. The group works to optimize the IT environment by standardizing production platforms, reducing complexity, and introducing innovative solutions that provide new business capabilities, reduce total cost of ownership, and create a competitive advantage for Citi.   We want to regularly engage with talented individuals who are passionate about producing clean, testable code as part of a high performing team. We have found this to be way more important than experience in the financial sector. We...

Overview Citi is a world-leading global bank. We have approximately 200 million customer accounts and a presence in more than 160 countries and jurisdictions worldwide. We provide consumers, corporations, governments, and institutions with a broad range of financial products and services, including consumer banking and credit, corporate and investment banking, securities brokerage, transaction services, and wealth management. We enable clients to achieve their strategic financial objectives by providing them with cutting-edge ideas, best-in-class products and solutions, and unparalleled access to capital and liquidity.   What We do / The Team The FX Data Analytics & AI Technology team, within Citi's FX Technology organization, seeks a highly motivated Senior Gen AI Engineer. The FX Data Analytics & Gen AI Technology team provides data, analytics, and tools to Citi FX sales and trading globally and is responsible for defining and executing the overall data...

Senior FX Cross Border Payments and AI Engineer   Overview As the world’s most global bank, Citi gives you the tools to be a trailblazer. We’re not just building technology; we’re building the future of banking. With thousands of employees located around the globe, we are an international team encompassing a broad range of teams, roles, and cultures, and we invite you to come and join us!   Citi’s technology team supports business operations in 100+ countries, across multiple lines of business spanning both Institutional and retail businesses. The group works to optimize the IT environment by standardizing production platforms, reducing complexity, and introducing innovative solutions that provide new business capabilities, reduce total cost of ownership, and create a competitive advantage for Citi.   We want to regularly engage with talented individuals who are passionate about producing clean, testable code as part of a high performing team. We have found this...

  The Team Citi’s Equities Derivatives Technology department is investing in front-office development to support the Derivatives Flow, Delta One, and Exotics desks. We are looking for a hands-on Senior Developer to build applications to help desks manage critical market data used for their derivatives products pricing and trading. This is a key position within a transformational agenda to modernize our technology stack and participate in containers migration, utilizing functional JVM-based micro-services.  This is an excellent opportunity for you to define yourself as one of the core contributors to the Equities investment strategy and set yourself up for a fruitful and successful career at Citi. You will also have the opportunity to work with advanced AI tools and platforms to enhance efficiency and accelerate development tasks. Role Overview Provide technical leadership to an Agile/AI powered development team, mentoring developers and establishing best practices for...

Position Summary The Front End (UI) Software Engineer is a senior-level position responsible for establishing, architecting, and implementing new or revised application systems and programs in coordination with the Technology team. The overall objective of this role is to lead applications systems analysis, frontend architecture, and fullstack programming activities. This role specifically focuses on leading the development of scalable, secure, and modern Front End (UI) digital platforms with Fullstack capabilities . The lead engineer will set architectural standards for enterprise-grade web applications, drive UI component libraries and design system adherence, establish best practices for API integration and backend services, and mentor development teams across the software delivery lifecycle.   Key Responsibilities Technical Leadership & Core Applications Development Architectural Alignment & System Design: Provide expertise in frontend/fullstack...

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...

We’re looking for a hands-on engineering lead with a passion for building AI-powered products and shaping engineering culture. You’ll provide technical leadership while remaining close to the code, partnering with teams across the organisation to build scalable developer platforms, influence engineering strategy and drive the adoption of Generative AI and modern engineering practices. 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...

Stellar Senior Lead Platform Engineer (Technology Products > Software Development > Senior Lead Developer, Career Stage = Manager)   Role Profile The successful candidate for the Stellar Senior Lead Platform Engineer/SREe, reporting to the Stellar Director of Technical Solutions & Delivery, will form part of a team building a complex and from grounds up new cloud-based critical market infrastructure service in a bold new venture part of LSEG.  This exciting opportunity requires a candidate who takes great pride in delivery excellence with excellent logical and technical skills and a can-do attitude combined with a helpful mentality, and a wish to play a critical role in forming and growing a new business.   Key Responsibilities ·        Design, develop and maintain infrastructure for cloud-based trading platforms tracking KPI metrics and improvement. ·        Be able to take ownership of the quality of the platform and...

Overview As the world’s most global bank, Citi gives you the tools to be a trailblazer. We’re not just building technology; we’re building the future of banking. With thousands of employees located around the globe, we are an international team encompassing a broad range of teams, roles, and cultures, and we invite you to come and join us!   Citi’s technology team supports business operations in 100+ countries, across multiple lines of business spanning both Institutional and retail businesses. The group works to optimize the IT environment by standardizing production platforms, reducing complexity, and introducing innovative solutions that provide new business capabilities, reduce total cost of ownership, and create a competitive advantage for Citi.   We want to regularly engage with talented individuals who are passionate about producing clean, testable code as part of a high performing team. We have found this to be way more important than experience in the financial...

About the Team Join Citi’s Enterprise AI Products team, a small, high-impact global team building innovative AI solutions for the wider bank. We are at the forefront of Agentic AI , developing capabilities that enable data sharing across agent ecosystems, support new Agentic AI use cases and shape modern AI architecture through purpose-built tooling. This is an opportunity to work at the intersection of cutting-edge technology and real business impact.   The Role We are looking for a seasoned Lead AI Engineer to combine hands-on engineering and architecture with strong business engagement. You will work directly with business partners to understand real-world problems, translate them into technical solutions and support successful delivery and adoption of our AI platforms.   This is a senior role within a deliberately flat team where you will have significant ownership and influence. You will help shape the platform strategy and roadmap, while gaining exposure to...

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...

SwapClear Senior DevOps Engineer Job Description 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 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, handle 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,...

Senior AI Engineer (Principal Consultant) Location: London (Hybrid) | Practice Area : Technology & Engineering | Type: Permanent Empower the next frontier of AI with Capco. Shape, build, and deliver future-ready generative systems. The Role We’re looking for a Senior AI Engineer (Senior/Principal Consultant) to join our Technology Delivery team. In this role, you’ll combine deep expertise in AI/ML engineering and software development to design, build, and deploy advanced generative AI and agentic systems for leading financial services clients. You’ll work hands-on across the full AI engineering lifecycle, from architecting intelligent multi-agent systems to deploying scalable production-grade AI applications within enterprise environments. As a senior consultant, you’ll also collaborate closely with multidisciplinary teams and client stakeholders to drive innovation, accelerate adoption, and deliver measurable business impact. What You’ll Do Architect and...

Manager, Data Engineering Lead SwapClear and Listed Rates, LCH Ltd, London LCH, SwapClear and Listed Rates LCH Ltd is an international multi-asset class central counterparty clearing house (CCP), part of the London Stock Exchange Group.  LCH Ltd serves a broad range of exchanges and over-the-counter trading platforms providing critical risk management services.  It has a unique membership model and its customers span the globe and include major financial groups (including the majority of the major investment banks), broker-dealers and specialist commodity houses and a wide range of buy-side and real-money firms including major asset managers and large hedge funds. This role provides an opportunity to work on one of the most critical finance technology functions in the world. The LCH CCP is systematically significant to the world’s financial markets which requires technology that has to be very resilient and with strong controls. LSE Group also provides a chance...

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...