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java developers Greater London
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citi
21 Jun, 2026
Full Time
Senior Low Latency Engineer
citi London, UK
Senior Low Latency Engineer 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 This is a senior level position responsible for establishing 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 and...
Adecco
26 Jun, 2026
Contract
Senior Full Stack Developer (React & C#.NET)
Adecco 39 Holloway Rd, London N7 8JP, UK
Job Title: Senior Full Stack Developer (React & Java script) Contract Length: 12 Months Location: London - 3 Days a week Daily Rate: Circa 650/Day (Inside IR35) About the Role Join our dynamic team as a Senior Full Stack Developer, where your expertise in React JS and Java script Core will shine! We are looking for a tech-savvy professional with a passion for building scalable applications within the financial sector. This is an exciting opportunity to work with cloud-native architectures and cutting-edge technologies. If you thrive in a collaborative environment and are eager to make an impact, we want to hear from you! Technical Skills Front-end: Strong proficiency in React.js, JavaScript/TypeScript, Redux/RTK, and modern UI patterns, develop framework is essential - More to React JS and Java script Back-end: Expertise in C# .NET Core, REST APIs, and microservices-based development is essential Python (pyspark): Experience with data...
Randstad Technologies
25 Jun, 2026
Permanent
Java & React
Randstad Technologies 39 Holloway Rd, London N7 8JP, UK
Location: London (Hybrid - 3 days in-office) Role Type: Full-Time / Permanent Experience Level: Mid-Senior (5-7 years) We are partnering with our client to hire a Senior Full-Stack Engineer. In this role, you will design, build, and scale cloud-native applications that are critical to the bank's risk management operations. This is a high-impact position for an engineer who excels at bridging complex backend data processing with highly responsive front-end interfaces, all hosted in a modern cloud environment. What You Will Do Build scalable applications using Core Java, multithreading, and ReactJS to handle heavy datasets efficiently. Engineer cloud-native solutions by designing, maintaining, and deploying applications leveraging Kubernetes and Amazon AWS. Design and integrate APIs using REST and gRPC to ensure seamless connectivity between the frontend and backend. Implement event streaming by integrating Kafka for real-time financial data processing. Lead...
citi
21 Jun, 2026
Full Time
Low Latency E-Trading Software Engineer
citi London, UK
Discover your future at Citi Working at Citi is far more than just a job. A career with us means joining a team of more than 230,000 dedicated people from around the globe. At Citi, you’ll have the opportunity to grow your career, give back to your community and make a real impact. Job Overview 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....
citi
21 Jun, 2026
Full Time
Senior Algo Trading Software Engineer (VP)
citi London, UK
Discover your future at Citi Working at Citi is far more than just a job. A career with us means joining a team of more than 230,000 dedicated people from around the globe. At Citi, you’ll have the opportunity to grow your career, give back to your community and make a real impact. Job Overview 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....
AND Digital
16 Jun, 2026
Principal Engineer (Backend focus -Java)
AND Digital London, UK
Job Description: Principal Engineer Role Title: Principal Engineer (Tech Lead) Location: London (Hybrid - 3 days per week) Reporting to: Delivery Lead / Client Services Director Core Tech: Java, React, AWS Who We Are: AND Digital are a tech company focused on accelerating digital delivery and dedicated to closing the digital skills gap. We’ve been helping organisations build better digital products and stronger digital teams since 2014. We believe our work should always make a remarkable impact for our clients. We do this through our regional offices (or ‘Clubs’) building strong relationships with our partners, so that they are always prioritised by a team within close proximity.  This unique model has driven success for our clients and ourselves, evidenced by our remarkable organic growth since 2014. Today we number more than 1,300 people with Clubs all over the UK, Europe and the USA with plans for global expansion in the next couple of years. Join us - and help us...
citi
21 Jun, 2026
Full Time
FX Risk Java Developer (VP)
citi London, UK
FX Risk Java Tech Lead   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 Citi's Markets technology team is growing at lightning speed, and we're looking for talented technology leaders to help build the future of global banking. As the world's most global bank, Citi provides an opportunity to touch every corner of the globe...
citi
21 Jun, 2026
Full Time
Full-stack Java Developer for Systematic & Credit Portfolio Trading Tools, Assistant Vice President
citi London, UK
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. Citi is seeking a highly motivated and curious full-stack engineer work embedded within the Systematic & Credit Portfolio Trading business and build out a first-class ecosystem of trading tools . This role offers a unique opportunity for in-person collaboration with traders, quants, and product...
Adecco
23 Jun, 2026
Contract
UI Developer Lead
Adecco Bromley, UK
Pontoon is an employment consultancy. We put expertise, energy, and enthusiasm into improving everyone's chance of being part of the workplace. We respect and appreciate people of all ethnicities, generations, religious beliefs, sexual orientations, gender identities, and more. We do this by showcasing their talents, skills, and unique experience in an inclusive environment that helps them thrive. Job Title: UI Developer Lead Location: Bromley - Hybrid ( 3 days in office) Contract: 12 months with possible extension. Rate: 850 inside umbrella Description: Highly skilled UI Developer to spearhead the development of the Single Dealer Platform within our Electronic Fixed Income Currencies business. The ideal candidate will have deep expertise in React, RxJS, and modern UI frameworks, combined with strong leadership and architectural skills to deliver high-performance, scalable, and intuitive trading interfaces. Key Responsibilities: Lead UI Development...
citi
21 Jun, 2026
Full Time
FX STIRT Technology - Senior Software Engineer (SVP)
citi London, UK
FX Client & Sales Technology - Senior Software Engineer (SVP) The STIRT Engineering Lead is a  London-based Senior Vice President  responsible for the  hands-on design, architecture, and implementation  of the full front-to-back technology platform supporting the STIRT business. This role sits at the intersection of engineering excellence and business partnership, requiring deep engagement with traders, quants, and stakeholders across FX and Rates desks. The role demands a  technically deep, hands-on engineering leader  with strong expertise in capital markets systems, responsible for driving the strategic evolution of STIRT technology — spanning curve construction, RFQ and pricing workflows (for FX and Interest Rate Derivatives) — while managing a globally distributed engineering team. The successful candidate will own the end-to-end technology vision for STIRT, eliminating fragmentation across trading units and delivering a modern, high-performance, resilient platform...
citi
21 Jun, 2026
Full Time
Core Engineering Java Development Lead – FX Tech (SVP)
citi London, UK
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...
citi
21 Jun, 2026
Full Time
Production Engineer - Vice President
citi London, UK
The Production Engineer is a pivotal role within Citi's Technology organisation, responsible for designing, building, and operating the intelligent systems that underpin our global production environment. This is an engineering-first position at the intersection of software craftsmanship, AI-native development, and large-scale distributed systems.   As part of a multi-year transformation journey, the successful candidate will help define what production engineering looks like in an era of autonomous agents, generative AI, and self-healing infrastructure. You will be expected to write production-grade code daily, design agentic workflows, and contribute meaningfully to the evolution of our AI engineering practices across Citi's India technology hub.   The role requires a comprehensive understanding of multiple areas within a function and how they interact to achieve the objectives of the function. Applies in-depth understanding of the business impact of...
citi
21 Jun, 2026
Full Time
Production Management Senior Engineer - Senior Vice President
citi London, UK
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 . The Senior Engineer in Production Management, will be responsible for the development and overall implementation of software in a complex, critical and large cross-departmental and multi-disciplinary area. The role is part of a multi-year transformation journey that will require a successful...
citi
21 Jun, 2026
Full Time
Quantitative Analyst - FX Algo Quant
citi London, UK
By Joining Citi, you will become part of a global organisation whose mission is to serve as a trusted partner to our clients by responsibly providing financial services that enable growth and economic progress. Team/Role Overview The Quantitative Analyst will join the FX Algo Quant team with a focus on FX Swaps and curve construction. This team is responsible for creating and improving models that allow us to automatically price and risk manage Linear FX products. The analyst is a strategic professional who stays abreast of developments within this field and contributes to the strategy by considering their application in own job and the business. There is a direct connection between the work delivered and the revenue that the businesses generate so therefore requires a good commercial awareness. Developed communication and diplomacy skills are required in order to guide, influence and convince others, in particular our trading colleagues. Expected to have a basic...
citi
21 Jun, 2026
Full Time
C# Developer - Equity Derivatives Technology Risk (AVP)
citi London, UK
C# Developer - Equity Derivatives Technology Risk (AVP) 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  Equities Technology at Citi is undertaking a bold, multi‑year transformation to build a best‑in‑class global platform across execution, prime, clearing and cross‑product margining. We are re‑engineering our technology...
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