12 of 12 Senior Java Software Engineer Jobs in the City of London

Senior Software Engineer (Java) – Portfolio Optimization | Fintech | London/Hybrid About My Client My client is a high-growth fintech company transforming the way capital markets operate. Their mission is to make global financial systems safer , more efficient , and more open , using … develop intelligent solutions that optimise portfolios, reduce risk, and unlock access to more diversified capital. About the Role My client is seeking a Senior Software Engineer to join their Portfolio Optimization team — a core group responsible for building the technology that drives their balance ...

Senior Java Engineer (Kubernetes, Kafka, Cloud) – Finance – London Daily rate: £500 - £700 (inside IR35) Duration: 12 months Hybrid: 8 days per month Start: ASAP A banking client of mine is looking for a Senior Java Engineer with Kafka … Docker skills to join the team on a freelance basis. We are specifically looking for an individual with strong Core Java expertise, as this role primarily involves server-side development. Must be based in the UK and happy to be on site 8 days per month which ...

seeking an experienced Senior Java Software Engineer to join the IT team at a leading bank, supporting the delivery, maintenance, and enhancement of core systems across various business areas, including operations, compliance, transactions, and client management. This is a 6-month contract … experience in regulated environments, financial services, or government/public sector organisations. In this role, you will be an integral part of the software development lifecycle, working closely with Senior Java Developers, UI/UX teams, and Agile Transformation to architect, build, and deliver ...

Lead Software Engineer – Java Microservices | London (1 day per week on-site) | £74,000 – £92,000 + Package We’re partnering with a leading UK bank to recruit a Lead Software Engineer with strong Java and microservices expertise. … This is a hands-on role building high-performance, scalable software for real-world, high-traffic systems. About the Role You’ll join a permanent feature team, taking end-to-end ownership of services, from design and development to testing, deployment, and optimisation. Your focus will ...

Senior Java Developer - Java, Springboot & AWS – paying up to £650/day (Inside IR35) – Hybrid (2x a week - London) – 6 month contract Our client is seeking a Senior Java Developer who is passionate about clean code, cloud-native systems … unique opportunity to work in an agile, high-ownership engineering culture. What You'll Be Doing: Build and scale backend services using Java and Spring Boot Shape a modern microservices architecture for a high-availability platform Deploy and manage services in AWS with Kubernetes (EKS) Design, implement ...

Java Engineer – 6-Month Contract – Hybrid (2 days on site, London) - Day Rate: Up to £700 (Inside IR35) Join a high-performing engineering team working on large-scale, high-availability systems used by millions. This role offers the chance to build and enhance complex backend services … modern, cloud-native environment. What you’ll be doing: Designing and developing performant, scalable backend systems using Java (up to Java 21). Building microservices with Spring Boot and related frameworks. Developing and maintaining RESTful APIs and event-driven systems. Writing clean, testable code and following ...

Senior Java Backend Engineer Location: Hybrid – London Job Type: Permanent | Full-Time Salary: £80,000 – £95,000 + Benefits We’re supporting a fast-scaling UK digital banking platform as they continue strengthening the systems that power millions of daily transactions. They … looking for a Senior Backend Engineer with strong Java engineering experience and a passion for building reliable, distributed systems at scale. This role is ideal for someone who enjoys working on event-driven, distributed architectures, values thoughtful system design, and wants to deliver high ...

Senior Java Developer – London (Hybrid: 2 Days Onsite) We’re partnering with a leading global organisation that is scaling its engineering function and looking for a Senior Java Developer to join their London team. If you’re passionate about building data-driven … work with modern cloud-native technologies, this is the role for you. What You’ll Be Doing Designing, developing, and maintaining scalable Java applications using strong OOP principles. Playing an active role in requirements gathering and design workshops , contributing ideas and identifying gaps. Mentoring and pairing with junior ...

dynamic markets. Trusted by regulators and institutions worldwide, their systems monitor over a trillion events every single day. They are now seeking a Senior Software Engineer to join the Algos Team. In this role, you'll design and develop advanced algorithms that detect … Collaborate with quants, data scientists, and compliance experts Enhance and maintain a mission-critical global codebase 🔹 What they're looking for 5+ years' software engineering experience (3+ in financial markets/algos) Strong coding skills in Java, Kotlin, C#, or C++ (Python a plus) Hands ...

Senior Developer – London 2 days a week/3 days remote | Software Engineering A growing tech organisation is looking for a Senior Developer to join its Software Engineering team in London. This is a great opportunity for a hands-on technologist … enjoys solving complex problems, working on large-scale enterprise systems, and delivering high-quality software solutions. In this role, you’ll contribute to technical design, end-to-end development, and delivery of enhancements across a suite of core enterprise products. You’ll work closely with architects, project managers ...

Core Java Developer Job Type: Contract (INSIDE IR35) Sector: Financial Services Location: London (Hybrid 8 days per month onsite) Duration: 12 months (scope for extension) Rate: £550 - £600 per day (INSIDE IR35) We are specifically seeking individuals with strong Core Java expertise, as these roles primarily … successful candidate will have demonstrable solutions design and development skills and experience alongside validated strong systems development experience at all stages of the software delivery lifecycle. Technical Skills: Strong systems development experience at all stages of systems development covering design, development, testing, live implementation and post implementation support. ...

iGaming, startups, or enterprise companies performing real time processing. Experience You will be expected to have the following: 6+ years commercial experience with Java Good understanding of JVM (memory model, concurrency, data structures) Spring framework, Spring Boot Maven Knowledge of REST APIs & Microservices MongoDB JUnit and TDD Nice ...