1 to 25 of 37 Permanent Senior Java Engineer Jobs in London

Senior Full Stack Software Engineer - FX Pricing (React, Typescript, Java, API) - London (VP) Overview Citi is a world-leading global bank. We have approximately 200 million customer accounts and a presence in more than 160 countries and jurisdictions worldwide. We provide consumers, corporations, governments, and institutions with a broad range of financial products and services, including consumer … strategic financial objectives by providing them with cutting-edge ideas, best-in-class products and solutions, and unparalleled access to capital and liquidity. The role We are seeking a Senior Applications Developer to join a successful team delivering pricing projects for the Foreign Exchange (FX) Business. The role involves all aspects of the software development life cycle: analysis, design … application programming will help your team raise their game, meeting your standards, as well as satisfying both business and functional requirements. Overview/What will you do: As a Senior Software Engineer (Vice President), your mission is to help shape our team of innovators and technologists toward creating next-level solutions that improve the way our business is More ❯

Senior Java Software Engineer - Java 11+, Spring, Spring Boot, Microservices, Kafka, Akka, Docker/Kubernetes, Real-time, TDD/BDD, Payments - London A Senior Java Engineer with a background in finance/payments and experience working on distributed real-time systems is sought after by a global Fintech. This organisation specialises in providing … high performance technology solutions to global financial institutions (including several Investment Banks), primarily to augment their payments capabilities. As a Senior Engineer, you will join the core engineering team working on the development of their real-time payments processing platform, using a primary tech stack of Java 17, Spring Boot and Akka. You will contribute from both … with a heavy focus on Pair Programming and TDD, so are looking for people from similar environments. To be successful, you will demonstrate: A strong background in hands-on Java engineering, currently working with Java 11+ Indepth knowledge of microservices architecture and usage of Spring/Spring Boot Experience developing distributed, real-time applications (with Akka AND/ More ❯

Job Title: Java Developer (Electronic Trading Platform - FIC) Contract Type: Outside IR35 Location: London Day Rate: Up to £850 per day Flexible Hybrid working: 1-2 days a week in London City offices Client: Prestigious Investment Bank Industry: Investment Banking Duration: 12 months + Overview: We are seeking an experienced Java Developer to join a high-profile investment … to ensure real-time decision-making capabilities. Integrate with Instrumentation Platforms : Integrate the platform with Prometheus and Geneos for continuous monitoring, diagnostics, and system health checks. Desired technical Skills: Java Expertise: Extensive experience with Core Java , focusing on low-level performance tuning, multithreading , and garbage collection optimization . FIC or similar business knowledge: Strong understanding of FIC markets More ❯

Job Title: Java Developer (Electronic Trading Platform - FIC) Contract Type: Outside IR35 Location: London Day Rate: Up to £850 per day Flexible Hybrid working: 1-2 days a week in London City offices Client: Prestigious Investment Bank Industry: Investment Banking Duration: 12 months + Overview: We are seeking an experienced Java Developer to join a high-profile investment … to ensure real-time decision-making capabilities. Integrate with Instrumentation Platforms : Integrate the platform with Prometheus and Geneos for continuous monitoring, diagnostics, and system health checks. Desired technical Skills: Java Expertise: Extensive experience with Core Java , focusing on low-level performance tuning, multithreading , and garbage collection optimization . FIC or similar business knowledge: Strong understanding of FIC markets More ❯

Role: Contract Senior Java Engineer Location: London (Hybrid | 3 days onsite initially) Contract Length: 6-Month Contract | Inside IR35 | £600–£700/day We’re looking for an experienced Senior Java Engineer to join our consultancy delivery team, supporting a flagship project with one of the UK’s leading digital banks . You’ll … releasing multiple times per day is the norm. This is a hands-on engineering role with the opportunity to work on cutting-edge systems from day one. Tech Stack: Java 21 Spring Boot Kubernetes , AWS Grafana , GitHub Event-driven architecture, microservices CI/CD & rapid delivery tooling What You’ll Be Doing: Build scalable and secure microservices using Java … maintain production-grade reliability Work onsite 3 days/week in London for the first 4–6 weeks (hybrid flexibility beyond this) We’re Looking For: 5+ years of Java engineering experience (Java 11+; ideally Java 21) Strong background with Spring Boot , microservices, and cloud-native design Hands-on with Docker, Kubernetes , AWS , and containerised deployments CI More ❯

Role: Contract Senior Java Engineer Location: London (Hybrid | 3 days onsite initially) Contract Length: 6-Month Contract | Inside IR35 | £600–£700/day We’re looking for an experienced Senior Java Engineer to join our consultancy delivery team, supporting a flagship project with one of the UK’s leading digital banks . You’ll … releasing multiple times per day is the norm. This is a hands-on engineering role with the opportunity to work on cutting-edge systems from day one. Tech Stack: Java 21 Spring Boot Kubernetes , AWS Grafana , GitHub Event-driven architecture, microservices CI/CD & rapid delivery tooling What You’ll Be Doing: Build scalable and secure microservices using Java … maintain production-grade reliability Work onsite 3 days/week in London for the first 4–6 weeks (hybrid flexibility beyond this) We’re Looking For: 5+ years of Java engineering experience (Java 11+; ideally Java 21) Strong background with Spring Boot , microservices, and cloud-native design Hands-on with Docker, Kubernetes , AWS , and containerised deployments CI More ❯

Role: Contract Senior Java Engineer Location: London (Hybrid | 3 days onsite initially) Contract Length: 6-Month Contract | Inside IR35 | £600–£700/day We’re looking for an experienced Senior Java Engineer to join our consultancy delivery team, supporting a flagship project with one of the UK’s leading digital banks . You’ll … releasing multiple times per day is the norm. This is a hands-on engineering role with the opportunity to work on cutting-edge systems from day one. Tech Stack: Java 21 Spring Boot Kubernetes , AWS Grafana , GitHub Event-driven architecture, microservices CI/CD & rapid delivery tooling What You’ll Be Doing: Build scalable and secure microservices using Java … maintain production-grade reliability Work onsite 3 days/week in London for the first 4–6 weeks (hybrid flexibility beyond this) We’re Looking For: 5+ years of Java engineering experience (Java 11+; ideally Java 21) Strong background with Spring Boot , microservices, and cloud-native design Hands-on with Docker, Kubernetes , AWS , and containerised deployments CI More ❯

Job Title: Senior Java Developer Location: Primarily Remote (with meet ups twice a month) Salary: £80,000 - £90,000 (Flexible based on experience) Are you an experienced Java developer looking for a new challenge? Do you thrive in an environment where you can take ownership of key areas and solve complex problems independently? Are you ready to … and be part of something exciting? Then this may be for you: Mostyn Chase are conducting an exclusive search for a well-established fintech in the payments space for Senior Java Developers to join this growing and dynamic team. The roles are designed to bring in developers who can work independently, solve complex problems, and eventually take ownership … autonomously and is comfortable working in a flexible, remote-first environment, this could be the perfect opportunity for you. The ideal candidate will have the following: Extensive experience in Java development, particularly in building scalable and secure web applications. Strong experience with Spring, Hibernate, MySQL, JSP, HTML, CSS, JavaScript, Angular, and TypeScript. Proven ability to work independently, solve complex More ❯

About the Role As a Java Senior Software Engineer working on our backend team, you will be contributing to our Kotlin and Java backend applications and systems development on our suite of IT Software products. Working in a team where Product, Engineering and QA join to build the NinjaOne product suite in an agile environment. Not … design and develop high-availability mission critical software systems that support our worldwide operations. We hire the best software engineers with experience in our stack: NinjaOne is built on Java , Kotlin , C++ , and Postgres , supporting millions of user endpoints and running as a scalable cloud service in AWS . Location- London, United Kingdom or Remote anywhere based in the … s degree or equivalent education in Technical or Engineering field of study or equivalent work experience Knowledge of functional and object-oriented programming design concepts 7+ years of professional Java software development in highly scalable systems and applications Experience working with Kotlin 5+ years of REST service development using Spring framework Working experience with AWS cloud services Experience developing More ❯

About the Role As a Java Senior Software Engineer working on our backend team, you will be contributing to our Kotlin and Java backend applications and systems development on our suite of IT Software products. Working in a team where Product, Engineering and QA join to build the NinjaOne product suite in an agile environment. Not … design and develop high-availability mission critical software systems that support our worldwide operations. We hire the best software engineers with experience in our stack: NinjaOne is built on Java , Kotlin , C++ , and Postgres , supporting millions of user endpoints and running as a scalable cloud service in AWS . Location- London, United Kingdom or Remote anywhere based in the … s degree or equivalent education in Technical or Engineering field of study or equivalent work experience Knowledge of functional and object-oriented programming design concepts 7+ years of professional Java software development in highly scalable systems and applications Experience working with Kotlin 5+ years of REST service development using Spring framework Working experience with AWS cloud services Experience developing More ❯

have at least 5-6 years of experience as a professional software engineer. We are very open about how we deliver software. For the most part we code in Java and we believe in clean coding, simple solutions, automated testing and continuous deployment. If you care enough to find elegant solutions to difficult technical problems, we'd love to … The main part of our Tech Stack is listed below, we don't ask that you have experience in all of this, but if you do, that's great! Java, which makes up the majority of our backend codebase AWS & GCP - we're cloud-native Microservice based architecture Kubernetes (EKS) TeamCity for CI/CD (lots of team are … from you, so come with questions and be curious. In general you can expect the below, following a chat with one of our Talent Team: Initial interview with an Engineer - ~45 minutes Take home technical test to be discussed in the next interview Technical interview - ~1.5 hours Final Interview - ~40 minutes Benefits 25 days holiday (plus take your public More ❯

Senior Java Developer - SC Cleared Looking for 1-2 Java Developers to work on a large government project. Java, AWS, TDD/XP, Spring Boot 2 days a week in London Candidates MUST have active SC Clearance £500 - £550 per day Inside IR35 12 month contract More ❯

Senior Java Developer - SC Cleared Looking for 1-2 Java Developers to work on a large government project. Java, AWS, TDD/XP, Spring Boot 2 days a week in London Candidates MUST have active SC Clearance £500 - £550 per day Inside IR35 12 month contract More ❯

Senior Java Developer - SC Cleared Looking for 1-2 Java Developers to work on a large government project. Java, AWS, TDD/XP, Spring Boot 2 days a week in London Candidates MUST have active SC Clearance £500 - £550 per day Inside IR35 12 month contract More ❯

Senior Software Engineer – Java Backend London (5 days onsite, with some ad-hoc flexibility) £85,000 – £120,000 (Permanent) TechHeads is currently seeking a Senior Software Engineer with strong Java backend experience, DevOps awareness, and proven technical leadership capabilities to join our Client’s London team. This is a high-impact role involving the … systems at significant scale, leading both engineering efforts and mentoring team members, while collaborating with globally distributed teams in the US, Ireland and India. Responsibilities: Design, develop, and maintain Java-based backend services using Spring Boot , REST/GraphQL , Kafka , PostgreSQL , and RabbitMQ . Contribute to infrastructure modernisation efforts, working closely with DevOps teams on Kubernetes , CI/CD … resilient APIs (REST/GraphQL) and optimise the full software development lifecycle through automation. Requirements: 7–10+ years of professional experience in software engineering, with a strong focus on Java backend development . Solid understanding of Spring Boot , Kafka , RabbitMQ , PostgreSQL , and modern API design patterns. Hands-on experience or familiarity with DevOps tools and concepts – e.g. Kubernetes , Git More ❯

Senior Software Engineer – Java Backend London (5 days onsite, with some ad-hoc flexibility) £85,000 – £120,000 (Permanent) TechHeads is currently seeking a Senior Software Engineer with strong Java backend experience, DevOps awareness, and proven technical leadership capabilities to join our Client’s London team. This is a high-impact role involving the … systems at significant scale, leading both engineering efforts and mentoring team members, while collaborating with globally distributed teams in the US, Ireland and India. Responsibilities: Design, develop, and maintain Java-based backend services using Spring Boot , REST/GraphQL , Kafka , PostgreSQL , and RabbitMQ . Contribute to infrastructure modernisation efforts, working closely with DevOps teams on Kubernetes , CI/CD … resilient APIs (REST/GraphQL) and optimise the full software development lifecycle through automation. Requirements: 7–10+ years of professional experience in software engineering, with a strong focus on Java backend development . Solid understanding of Spring Boot , Kafka , RabbitMQ , PostgreSQL , and modern API design patterns. Hands-on experience or familiarity with DevOps tools and concepts – e.g. Kubernetes , Git More ❯

Senior Java Developer/Engineer £60,000 - £70,000 45 days holiday Fully Remote - Must be based in the UK Are you looking to join an expanding development team for a global fintech client? There has been significant investment into growing the engineering team and this an amazing opportunity to be a part of something special! About … the Senior Java Developer role: My client is building the next generation of capabilities that powers merchant-first ecosystems. They believe that focused and empowered teams can do great things so you'll find that they are a curious, driven, and pragmatic team who believe in outcomes over outputs, and they are looking for like-minded individuals to More ❯

x New Java Positions - Trading - Fully Remote in the UK - £120k We are working with an enterprise trading company, who are looking for 2x Senior Java Engineers to help build our their multi-asset platform. Technical Stack - Java, Multithreading, GC-free/low-GC programming, Clickhouse, Aeron. Package - £120,000 + RSU + Pension You can More ❯

Senior Software Engineer – Java - FinTech Remote First | London (UK) | Up to £120k + Equity + Benefits Are you a Java developer comfortable working in Core Java not relying on frameworks? Someone who thrives in a collaborative, TDD environment? Do you believe in XP Principles, pair programming, CI/CD and clean, maintainable code? If so … love to hear from you. Our FinTech client could be the challenge you are looking for.... Experience: Good tenure demonstrating depth of involvement in projects A proven background as Java Software Engineer Desirable: Performance based software/Real-time software Desirable: High availability/Low Latency/Concurrency We value growth and flexibility, welcoming developers from all backgrounds. … Skills: Strength with Core Java - (monolithic environment) Ansible, Aeron, Jenkins Strong understanding of TDD/BDD Clear communication and teamwork Desirable: Engineers with C++ background generally do well Environment: Extreme Programming (XP) principles, with a strong focus on TDD, BDD, and DDD. Pair programming culture ensures high-quality code and continuous learning. Continuous integration—every commit is releasable, and More ❯

Senior Software Engineer - Java Fully remote based in the UK. The company This is an opportunity for a Senior Software Engineer to join an award winning Fintech as their continue their next phase of growth. They create industry changing solutions, operate in close to 50 global markets and are known as a market leader in … areas of the company. Participate in coding activities that are in support of design outcomes. What you will need To be able to translate corporate strategy into technical strategy. Senior level experience with Java Ability to pinpoint strengths and weaknesses in an enterprise system. Excellent communication skills and desire to learn new skills. To be a technical leader More ❯

Senior Java Developer Are you a Senior Java Developer eager to lead the charge in innovation for one of Silicon Valley’s largest tech giants? This is a rare opportunity to join a true Tech Giant as they are building a brand new team at their hub based near Shoreditch as they build a next-gen … platform, shaping the future of how the business operates globally. Backed by significant investment, this giant has expanded rapidly in the UK and is seeking multiple Senior Developers to lead new squads focused on greenfield projects. They have a strong engineering culture in the London office, and as their Senior Developer, you’ll work with Java and … Spring Boot. They’ve got their own internal cloud and tooling's, using Prometheus and Grafana. As their Senior Developer, you’ll be: A key advocate for best coding practice, standards, and innovation. TDD approach is key for this as you’ll be owning the end to end development of the platform Experienced in mentoring and also hands on More ❯

Senior Java Developer Are you a Senior Java Developer eager to lead the charge in innovation for one of Silicon Valley’s largest tech giants? This is a rare opportunity to join a true Tech Giant as they are building a brand new team at their hub based near Shoreditch as they build a next-gen … platform, shaping the future of how the business operates globally. Backed by significant investment, this giant has expanded rapidly in the UK and is seeking multiple Senior Developers to lead new squads focused on greenfield projects. They have a strong engineering culture in the London office, and as their Senior Developer, you’ll work with Java and … Spring Boot. They’ve got their own internal cloud and tooling's, using Prometheus and Grafana. As their Senior Developer, you’ll be: A key advocate for best coding practice, standards, and innovation. TDD approach is key for this as you’ll be owning the end to end development of the platform Experienced in mentoring and also hands on More ❯

Senior Java Developer Up to £150k - Remote Working – 6+ years experience (PhD Required) Our client, a GreenTech specialising in optimum renewable energy software, is revolutionising the energy industry by making sustainable living accessible and effortless for both suppliers and consumers. They’re looking for a Senior Java Developer who has a PhD in Computer science and … is passionate about new, advanced technologies, being able to create impactful solutions in a fast-paced, collaborative environment. Role Highlights Design and implement high-performance software systems using Core Java, without relying on frameworks. Tackle multi-threaded, low-latency challenges, manage extensive data streams, and optimise asynchronous programming for real-time scalability. Drive projects that advance sustainable energy solutions … greener future. Key Requirements Compulsory: A PhD in Computer Science and the ability to demonstrate extensive knowledge in Software Development. 6+ years with extensive hands-on experience in Core Java, developing systems from the ground up without frameworks. Advanced proficiency in multi-threading, low-latency solutions, and data stream management. Strong knowledge of Advanced Computer Science Principles, Compiler Theory More ❯

Senior Java Developer Up to £150k - Remote Working – 6+ years experience (PhD Required) Our client, a GreenTech specialising in optimum renewable energy software, is revolutionising the energy industry by making sustainable living accessible and effortless for both suppliers and consumers. They’re looking for a Senior Java Developer who has a PhD in Computer science and … is passionate about new, advanced technologies, being able to create impactful solutions in a fast-paced, collaborative environment. Role Highlights Design and implement high-performance software systems using Core Java, without relying on frameworks. Tackle multi-threaded, low-latency challenges, manage extensive data streams, and optimise asynchronous programming for real-time scalability. Drive projects that advance sustainable energy solutions … greener future. Key Requirements Compulsory: A PhD in Computer Science and the ability to demonstrate extensive knowledge in Software Development. 6+ years with extensive hands-on experience in Core Java, developing systems from the ground up without frameworks. Advanced proficiency in multi-threading, low-latency solutions, and data stream management. Strong knowledge of Advanced Computer Science Principles, Compiler Theory More ❯

Senior Software Engineer – Shape the Future of Payments We're hiring on behalf of an innovative payments technology company building the next generation of merchant-first systems. If you're a backend-focused engineer who values autonomy, clarity of purpose, and building products that matter, read on. The Role Join a high-impact team delivering scalable backend … planning, and team best practices Own projects end-to-end — from concept to deployment What You Bring 5–8 years of software engineering experience Strong hands-on experience with Java and backend system design Familiarity with systems integration, messaging middleware, and distributed architecture A pragmatic mindset — you balance clean design with delivering value fast Comfortable working solo or as More ❯