Top Tech Jobs & Startup Jobs in London

Develop and support scalable, cloud-native FX cross-border payments and custody applications. Design system architecture, write and test Java software, modernize legacy platforms, improve development practices, and provide third-line production support. Collaborate with sales, trading, quantitative, and product teams to deliver data-driven solutions. The role also includes mentoring engineers, troubleshooting systems, maintaining documentation, and implementing technologies such as messaging, caching, Kubernetes, and AI coding tools.

Design, develop, test, and support high-performance frontend applications for global electronic trading and algorithmic trading platforms. Build real-time data visualizations for pricing, order books, and trade blotters using streaming data and modern UI frameworks. Provide technical oversight, optimize performance and latency, follow application lifecycle and governance standards, and collaborate with technology and product teams to deliver scalable solutions.

Lead development of ultra-low-latency trading systems and application frameworks using Rust and Java. Build and optimize event-sourced microservices supporting algorithmic trading, market data replay, and backtesting. Analyze complex systems, integrate new functions, tune performance, and work with Linux, JVM, networking protocols, and kernel-bypass technologies. Serve as a subject matter expert, collaborate with senior stakeholders, document architecture, and mentor developers across Citi’s Markets Technology teams.

Leads global development for mission-critical repo and collateral optimization applications supporting finance and funding desks. Oversees application design, development, integration, testing, deployment, performance, availability, and regulatory compliance across front-end and back-end systems. Collaborates with traders, business stakeholders, and senior leaders to define scalable solutions, sets technical direction, coaches developers, and drives initiatives involving Java, Angular, C#, Node.js, databases, messaging, caching, cloud containers, and event-driven architectures.

Provides senior legal counsel to Citi’s global Spread Products sales and trading business. Advises on derivatives, structured credit, complex transactions, banking regulations, legal and reputational risks, and strategic business initiatives. Collaborates with global Legal, Compliance, and Risk teams, monitors regulatory developments, manages complex legal issues, and supports commercially practical, compliant solutions. The role requires a qualified attorney with financial services experience and a bar license in good standing.

Provides comprehensive administrative support to a senior manager and department, including calendar and meeting coordination, travel arrangements, expense reconciliation, document and presentation preparation, invoice processing, supply ordering, virtual request follow-up, and special projects. The role may also train administrative staff and requires strong organization, communication, Microsoft Office proficiency, adaptability, and attention to detail.

Ten-week Citi Services internship involving market research, financial and client data analysis, business development support, product commercialization, process optimization, and reporting. The role includes evaluating AI-enabled automation and analytics, preparing presentations for stakeholders, and participating in training and networking. Candidates should demonstrate strong analytical, communication, organizational, interpersonal, and problem-solving skills, along with proficiency in Microsoft Excel and working knowledge of PowerPoint and Outlook.

Develop and deploy high-performance full-stack software for trader workflow tools within Citi’s Strategic Equity Solutions team. Responsibilities include designing microservices, collaborating with business stakeholders, translating trading requirements into technical solutions, writing clean code, mentoring engineers, evaluating AI tooling, and owning the complete software lifecycle through testing, deployment, monitoring, and production support.

Advise ultra-high-net-worth clients on acquiring, disposing of, hedging, financing, and monetizing concentrated assets. Develop bespoke capital markets and wealth planning solutions, manage client pipelines, identify business opportunities, coordinate with internal product partners, and drive revenue growth. The role also requires risk and compliance oversight, performance reporting, stakeholder collaboration, and support for technology, governance, and product enhancement initiatives.

Leads Citi’s global Trade and Working Capital Technology organization of more than 800 engineers across 90+ countries. Owns technology strategy, architecture, modernization, transformation, governance, regulatory commitments, operational resiliency, client experience, and multiyear roadmaps. Oversees delivery, risk reduction, cost management, technology controls, and adoption of DevOps, CI/CD, and Agile practices while developing senior talent and strengthening business, client, regulator, and fintech partnerships.