Top Tech Jobs & Startup Jobs in London

Leads development of low-latency Java applications and frameworks for algorithmic trading and eTrading platforms. Responsibilities include building event-sourced microservices with microsecond response times, integrating and deploying products, analyzing complex systems, tuning performance, handling market data, and designing application solutions. The role also mentors developers, collaborates with senior stakeholders and end users, supports modernization across technology teams, and contributes to risk, compliance, documentation, and architecture.

Develops and leads creative concepts for integrated campaigns across brand, marketing, digital, social, internal communications, and experiential channels. Translates complex financial information into compelling visual narratives, collaborates with copywriters, designers, marketers, and stakeholders, and guides work from concept through execution. Presents ideas to senior leaders, directs art workers, ensures brand and regulatory compliance, manages multiple deadlines, and maintains high standards for design quality and delivery.

Build and improve quantitative frameworks, models, and strategies for FX electronic trading and algorithmic execution. Diagnose performance issues, analyze market and execution data, collaborate with sales and trading teams, conduct research on market making and transaction cost analysis, and develop production-quality code. The role requires strong Python programming, quantitative modeling, statistical reasoning, market microstructure knowledge, and the ability to translate trading insights into measurable improvements.

Lead hands-on development of FX eTrading pricing systems using Java and ultra-low-latency practices. The role combines software architecture, frequent coding, technical thought leadership, and management of engineering teams. Responsibilities include designing new systems, modernizing legacy platforms, troubleshooting across software, hardware, and networks, collaborating with trading and quantitative teams, and establishing engineering best practices across FX Technology.

Lead development of high-performance Java applications for real-time FX risk management. Architect low-latency distributed systems, optimize JVM performance, and work with Apache Ignite, MongoDB, Oracle, Kafka, cloud platforms, and messaging technologies. Translate requirements from traders, quantitative analysts, and stakeholders into production software. Drive technical standards, AI-assisted development, testing, code reviews, releases, and L3 production support while contributing to the platform’s long-term technology strategy.

Build and support production-grade Generative AI software and services for intelligent document processing, extraction, classification, translation, fraud detection, and workflow optimization. Own solutions from experimentation through deployment, evaluate models and prompts, design scalable and auditable architectures, troubleshoot distributed systems, collaborate with stakeholders, and provide technical leadership and mentorship in a regulated banking environment.

Lead managed investments sales and client engagement across EMEA, driving business origination, asset raising, and distribution strategy for public and private market products. Partner with private bankers and investment counselors, assess client investment needs, develop tailored solutions, present proposals, implement recommendations, and pursue additional business. The role requires strong product knowledge, client-facing sales expertise, communication skills, and adherence to FCA, PRA, and firm risk and compliance requirements.

Ten-week Internal Audit internship in London involving structured training, mentoring, cross-functional exposure, independent assurance work, and presentation of accomplishments to senior management. Analysts assess governance, risk management, and internal controls across Citi’s businesses and functions. Strong analytical, communication, teamwork, problem-solving, multitasking, and attention-to-detail skills are expected. Successful interns may be considered for full-time Internal Audit Analyst roles.

Oversee collateral risk across institutional portfolios by reviewing collateral eligibility, valuation, coverage, margin sufficiency, concentration, market stress, liquidity, and wrong-way risk. Monitor portfolio trends and exceptions, produce risk reporting, support mitigation strategies, maintain policies and procedures, and ensure regulatory alignment. Partner with Credit, Portfolio Management, Legal, Operations, and Risk teams while supporting audits, regulatory exams, and governance initiatives.

Lead technical security efforts for AI and agentic systems at enterprise scale. Responsibilities may include AI-assisted penetration testing, automated exploit validation, AI security architecture, model evaluation, guardrails, runtime monitoring, vulnerability management, security assurance, governance, detection, triage, and incident response. The role requires building production security capabilities, understanding code and architecture, and addressing emerging threats posed by AI-enabled attacks and insider-like agent behavior.