Top Tech Jobs & Startup Jobs in London

Supports global Spread Products trading applications and eTrading platforms in a production environment. Responsibilities include trade-floor user support, follow-the-sun coverage, overnight risk batch monitoring, downstream feed investigation, incident and task management, observability improvements, resiliency initiatives, and collaboration with development teams. The role requires analytical problem solving, crisis response, prioritization, scripting, Unix, SQL, log analysis, and communication with technical and business stakeholders.

Build greenfield software projects using AI technologies for Citi’s Production Management teams. Develop AI agents, integrate LLM APIs, and design, iterate, and evaluate prompts. The role requires software engineering experience, ideally in Python, hands-on AI/ML engineering, strong prompt engineering expertise, and the ability to learn rapidly evolving frameworks. Collaboration in a global matrix environment, technical communication, and a systematic engineering mindset are also valued.

Lead Citi’s payments clearing modernization product, including rollout of a strategic processor and integration with major global market infrastructures. Serve as a SWIFT CBPR+ and ISO 20022 subject matter expert, define requirements and business cases, manage the product lifecycle, lead transformation initiatives, and coordinate senior stakeholders across global businesses while incorporating regulatory and compliance requirements.

Lead application and system testing strategy and execution across IT projects, including automated testing, end-to-end transaction workflows, requirements translation, test analysis, reporting, estimation, and quality monitoring. Mentor junior staff, resolve complex testing issues, establish testing standards and tools, manage risks and dependencies, and ensure compliance with governance and regulatory requirements. The role requires equities cash electronic trading expertise, FIX Protocol knowledge, and AI prompt engineering experience.

Lead development of cloud-hosted Java and Kotlin applications supporting equity derivatives trading, pricing, and market data. Mentor developers, establish engineering and AI development practices, translate trading and quant requirements into technical designs, and improve system performance, scalability, reliability, and observability. Collaborate with traders, quants, and technology teams while modernizing platforms through containers, microservices, CI/CD, and DevOps practices.

Build and maintain robust software solutions for Citi’s margin and collateral technology platform. Develop RESTful APIs and applications using Java, React, and/or Python; apply TDD, clean-code principles, data structures, algorithms, and SQL. Collaborate with product teams and users, contribute across the software development lifecycle, and help deliver resilient, automated financial systems. Experience with cloud services, distributed systems, and financial services is beneficial.

Develops capital and risk-weighted asset plans for Citi’s Investor and Issuer Services business. Partners with Finance, product, sales, and business leaders to improve profitability, support growth, drive cross-sell initiatives, and manage capital strategy workstreams. Translates financial and analytics data into strategic recommendations, coordinates stakeholders across a matrix organization, and supports capital planning and balance-sheet decisions.

Conduct equity research on business services and transportation companies by building financial models, performing macroeconomic and industry analysis, writing investment research, making recommendations, and communicating ideas to institutional investors. Responsibilities include due diligence, corporate access, client interaction, earnings and event tracking, conference participation, valuation analysis, risk management, regulatory compliance, and maintaining required licenses.

Independently test FX eTrading applications across UI, API, and server-side components. Design and maintain manual and automated test frameworks, perform static analysis, investigate defects, support release readiness decisions, and improve QA processes and CI/CD tooling. Collaborate with development, business, and production support teams while applying responsible AI tools for test design and analysis and protecting confidential data.

Develop and maintain high-volume, low-latency C# applications for equity derivatives technology risk. Design scalable systems, apply software design patterns, write unit tests, conduct performance testing and profiling, and troubleshoot application and performance issues. Collaborate with globally distributed engineering and business teams while supporting financial data processing, CI/CD, messaging, and resilient trading platforms with limited supervision.