senior java developer jobs in London

To design, develop and improve software, utilising various engineering methodologies, that provides business, platform, and technology capabilities for our customers and colleagues.AccountabilitiesDevelopment and delivery of high-quality software solutions by using industry aligned programming languages, frameworks, and tools. Ensuring that code is scalable,...

Discover your future at Citi Working at Citi is far more than just a job. A career with us means joining a team of approximately 219,000 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 Senior Low Latency Java Engineer This is a senior...

iSAM is an innovative, financial technology firm specialising in quantitative trading, comprised of iSAM Funds and iSAM Securities.iSAM Securities regulated by the FCA, SFC, and CIMA registered, is a leading algorithmic trading firm and trusted electronic market maker, providing liquidity, technology and prime services to institutional clients and trading...

Java / Angular Fullstack DeveloperSalary: £60,000 - £75,000 (depending on experience)Location: Central LondonWorking Arrangement: Hybrid, 2 days per week in the officeEmployment Type: PermanentAvanti Recruitment is currently recruiting for a Senior Java Fullstack Engineer to join an established, internationally recognised software company based in Central...

Senior Ruby on Rails Engineer 600/day Inside IR35 | 6 Months | Predominantly RemoteWe are seeking a Senior Ruby on Rails Engineer to join a large-scale content transformation programme.Have you got what it takes to succeed The following information should be read carefully by all candidates.This role goes beyond development, requiring someone who can lead...

Entelect is seeking a Java Team Lead to guide delivery of web and mobile applications for leading organisations, with a strong emphasis on mentorship, collaboration, and career development.You will foster a DevOps culture through containerisation and CI, engage across the SDLC, and lead a multidisciplinary team in designing scalable solutions.The role...

We are seeking a driven Commodities Trading C# Developer to join our London-based core development team. The successful candidate will serve the full pre-trade through accounting chain for Commodities Derivatives, contributing to a portfolio of projects covering enhancements to pricing, risk, regulatory and post-trade services, as well as technical...

Senior Python Developer – (Performance Engineering) Bristol HQ -2 days a week onsite **Security clearance is essential** Up to £80 P/H Inside IR35 We are seeking an experiencedSecurity clearedSenior Python Developer with strong Performance Engineering experience to join a technical team, developing and optimising high-performance, low-latency software...

Your role What you’ll be doing Senior Software Developer What We Need Corpay is currently looking to hire a Senior Software Developer within our Cross-Border division. This position falls under our Corporate Payments line of business and is located in London. In this role, you will help evolve the platforms that power Corpay Cross-Border’s international...

Senior KDB+/q DeveloperQbyte Computing Limited is a London-based Software-as-a-Service company working at the intersection of technology and financial markets. Alongside our own products, we partner with leading banks, hedge funds, trading firms and digital-asset businesses.The opportunityWe are looking for a Senior KDB+/q Developer to design, build and...

About us Appnovation is the AI Product Company. Headquartered in Vancouver, Canada, with teams around the world, Appnovation builds AI products, delivers enterprise AI and digital solutions, and co-invests with clients to bring new AI products to market. Open source has been the foundation of Appnovation's work since 2007, and it remains the foundation...

Senior Software Engineer with AI We're recruiting for a sustainability business investing in its next generation of digital products. They're looking for a talented Senior Developer who combines strong development skills with practical experience of AI-assisted coding, generative AI and intelligent automation. What you'll get involved in Build cloud...

OverviewSenior React Native Engineer with Leadership experience - 6 month contract - Remote/UK based - Start ASAP. My client is urgently looking for a Senior React Native/React Engineer with Management experience, to help build mobile, connected TV, and web applications for an enterprise company.ResponsibilitiesTeam leadership is a must haveProficient in...

Interview date: w/c 7 December 2026 (may be subject to change) OPDC Old Oak and Park Royal Development Corporation (OPDC) is a Mayoral Development Corporation with planning, delivery, and compulsory purchase powers and a remit to deliver regeneration in its area. Old Oak is OPDC’s core regeneration project located in an area with a rich, cultural heritage...

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...

As an employee of our company, you willcollaborate with each department to create and deploy disruptive products.Come work at a growing company that offers great benefits with opportunities to moving forward and learn alongside accomplished leaders. We're seeking an experienced and outstanding member of staff. This position is bothcreative and rigorousby...

At LEGO Digital Play, we’re bringing the LEGO® System-in-Play to the digital builders of tomorrow. We’re building the LEGO brand’s digital home: a place where builders of every age can create, share and discover, held to the standard of craft the LEGO brand is known for. We are at an early phase of this new company, offering a unique opportunity to...

Organisation London Sport Salary 47277 Location 2 plus days per week in our central London office Contract type Fixed Term (Full time) Closing date 15 November 2026 Interview date 26 November 2026 Job Description We’re looking for a Senior Development Manager to lead the work of London Sport in delivering the Place Expansion programme in Enfield, as part...

Senior Ruby on Rails Engineer 600/day Inside IR35 | 6 Months | Predominantly RemoteWe are seeking a Senior Ruby on Rails Engineer to join a large-scale content transformation programme.Have you got what it takes to succeed The following information should be read carefully by all candidates.This role goes beyond development, requiring someone who can lead...

Join a dynamic energy provider dedicated to sustainable solutions in the UK. We seek enthusiastic and resourceful Backend Python Engineers at senior levels who are passionate about crafting exceptional products. Initially it will be a six-month contract but there is potential for it to be extended. The role is Hybrid, with one day a week being based in...