1 to 25 of 37 Contract Java Developer Jobs

Java Developer Hybrid (Belfast) | 6-Month Contract | Inside IR35 Our client, a leading organisation within the financial services sector, is seeking an experienced Java Developer to join their Belfast-based technology team on an initial 6-month contract (Inside IR35). This is an excellent opportunity to work on high-performance, data-driven applications within a … fast-paced enterprise environment. The successful candidate will play a key role in developing and optimising complex batch processing and integration systems using Java 17, Spring Batch, Spring Integration, and GridGain Database. Key Responsibilities Design, develop, and maintain scalable Java 17 applications for enterprise data processing. Build and optimise batch processing solutions using Spring Batch. Design and implement … deployment and operational tasks in Unix/Linux environments. Collaborate with cross-functional technical and business teams to deliver high-quality, reliable solutions. Skills & Experience Required Strong proficiency in Java 17, including modern Java features and best practices. Proven experience with Spring Batch and Spring Integration. Solid understanding of Unix/Linux scripting and SQL. Hands-on experience More ❯

Java Developer Location: Dublin, hybrid working model Term: 12 months, excellent day rate Java Developer wanted to help design and build high-throughput systems for a well-known name in Dublin’s tech scene. You’ll be part of a modern engineering environment offering excellent hybrid flexibility (with some on-site collaboration) and the freedom to … deliver clean, scalable services. This is a great opportunity for a Java developer seeking a long-term contracting role within an organisation that’s heavily investing in modern technologies and innovative approaches. What you’ll bring: 5+ years Java development experience, comfortable working across Spring/Spring Boot microservices etc. Decent hands on skills with Angular, at More ❯

Senior Java Developer/Low-Latency Developer Central London - Hybrid - 3 days on site, 2 days remote Inside IR35 12 months Brief Our client is seeking a Low Latency Java Developer with hands-on experience in FIX protocol integration to join their FX Options technology team. You will play a hands-on role in modernising … and optimising the trading platform , delivering ultra-low latency solutions for front-office trading and risk management. Key Responsibilities Develop, optimise, and maintain low latency Java-based trading systems Implement and maintain FIX protocol connectivity for FX Options trading Work closely with Quants, Traders, and Risk teams to translate business requirements into high-performance solutions Take ownership of the … and provide technical leadership within the development team Collaborate with cross-functional teams on architecture, design, and deployment of trading solutions Required Skills 5-10 years' experience as a Java Developer in front-office or trading environments Strong Java Core , multi-threading , and concurrent programming experience Proven experience with low latency system design and optimisation Hands-on More ❯

Senior Java Developer/Low-Latency Developer Central London - Hybrid - 3 days on site, 2 days remote Inside IR35 12 months Brief Our client is seeking a Low Latency Java Developer with hands-on experience in FIX protocol integration to join their FX Options technology team. You will play a hands-on role in modernising … and optimising the trading platform , delivering ultra-low latency solutions for front-office trading and risk management. Key Responsibilities Develop, optimise, and maintain low latency Java-based trading systems Implement and maintain FIX protocol connectivity for FX Options trading Work closely with Quants, Traders, and Risk teams to translate business requirements into high-performance solutions Take ownership of the … and provide technical leadership within the development team Collaborate with cross-functional teams on architecture, design, and deployment of trading solutions Required Skills 5-10 years' experience as a Java Developer in front-office or trading environments Strong Java Core , multi-threading , and concurrent programming experience Proven experience with low latency system design and optimisation Hands-on More ❯

We’re looking for a Senior Java Developer for our public sector client based in Leeds on an initial 12-month contract paying up to £700 per day Inside IR35. This role allows hybrid working with an expectation to attend the office 3 days per week. You will need to either hold current BPSS clearance or have the … ability to pass it, and be eligible for SC clearance. The successful Senior Java Developer will possess proven skills working with the following – Java 21 (or later) Test Driven Development (TDD) and Behaviour Driven Development (BDD) Large microservice architectures Agile environments and pair programming Implementing APIs for internal and external use Building automated test suites in CI … have: Jackson, JAX-RS, Mockito ActiveMQ or Kafka MongoDB or other NoSQL/document databases Experience scaling high-traffic websites and handling large data sets Interested? Please apply below. Java Software Engineer, Java, Java 21, Microservices, TDD, BDD, Agile, APIs, CI/CD, Leeds, Government, Public Sector, Developer, Contract, Inside IR35 More ❯

Senior Full Stack Java Developer – Long-Term Contract • 12+ Month Engagement • Excellent Daily Rate Available • Galway/Hybrid Working (great flexibility) We’re partnering with a forward-thinking tech organisation in Galway to expand a high calibre engineering group. This is a long-term contracting opportunity where you’ll work with cutting-edge technologies, contribute to large-scale … ll play a key role in shaping how data moves, scales and powers real-world use cases across platforms. Your role Develop and optimise complex enterprise applications with modern Java tooling. Use Spring Boot, microservices architecture and cloud native tech to deliver robust, scalable solutions. Work closely with cross-functional Agile teams across design, engineering, and architecture. Explore emerging … tech — from distributed ledgers and digital asset workflows to AI-driven automation and advanced data pipelines. Your background 5+ years’ experience as a Java developer working on modern web or cloud-based systems. Strong skills in Java, microservices, Spring Boot, and cloud-native development. Bonus points for exposure to JavaScript/TypeScript frameworks like Angular or Node.js. More ❯

Low Latency Java Developer - FX options - Inside IR35 Central London - Hybrid - 3 days on site, 2 days remote 12 months Brief Our client is seeking a Low Latency Java Developer with hands-on experience in FIX protocol integration to join their FX Options technology team. You will play a hands-on role in modernising and optimising … the trading platform , delivering ultra-low latency solutions for front-office trading and risk management. Key Responsibilities Develop, optimise, and maintain low latency Java-based trading systems Implement and maintain FIX protocol connectivity for FX Options trading Work closely with Quants, Traders, and Risk teams to translate business requirements into high-performance solutions Take ownership of the end-to … and provide technical leadership within the development team Collaborate with cross-functional teams on architecture, design, and deployment of trading solutions Required Skills 5-10 years' experience as a Java Developer in front-office or trading environments Strong Java Core , multi-threading , and concurrent programming experience Proven experience with low latency system design and optimisation Hands-on More ❯

Low Latency Java Developer - FX options - Inside IR35 Central London - Hybrid - 3 days on site, 2 days remote 12 months Brief Our client is seeking a Low Latency Java Developer with hands-on experience in FIX protocol integration to join their FX Options technology team. You will play a hands-on role in modernising and optimising … the trading platform , delivering ultra-low latency solutions for front-office trading and risk management. Key Responsibilities Develop, optimise, and maintain low latency Java-based trading systems Implement and maintain FIX protocol connectivity for FX Options trading Work closely with Quants, Traders, and Risk teams to translate business requirements into high-performance solutions Take ownership of the end-to … and provide technical leadership within the development team Collaborate with cross-functional teams on architecture, design, and deployment of trading solutions Required Skills 5-10 years' experience as a Java Developer in front-office or trading environments Strong Java Core , multi-threading , and concurrent programming experience Proven experience with low latency system design and optimisation Hands-on More ❯

Java Developer - Inside IR35 (2 Days On-site, Telford) Contract | Central Government Project | Hybrid Working Must be able to obtain SC We're seeking an experienced Java Developer to join a high-performing delivery team within a large-scale central government modernisation programme . You'll work as part of an Agile Scrum team made up … of Java Engineers, Front-End Developers, and Quality Engineers, contributing to the transformation of legacy systems into scalable, cloud-based services. Location: Telford (2 days on-site per week) Contract: Inside IR35 Sector: Central Government/Public Sector Duration: Ongoing contract Key Responsibilities Develop, enhance, and maintain Java-based microservices and APIs Build and test RESTful APIs using … high-quality software solutions Write clean, maintainable code following best practices in secure development Support continuous integration, testing, and deployment activities Essential Skills & Experience Strong hands-on experience with Java and Spring Boot Solid understanding of REST API development and JSON Proficiency in JUnit for unit testing Experience deploying microservices using Kubernetes Proven background working in complex technical environments More ❯

Backend Java Developer 12-Month Contract Onsite | Nenagh, Ireland | 5 Days per Week We're seeking an experienced Backend Java Developer to join our client's engineering team in Nenagh. This is an excellent opportunity to contribute to a high-transaction, enterprise-scale payment platform used globally. What You'll Do Develop and maintain secure, high … performance backend systems for payment processing. Design and optimise scalable microservices and APIs using Java, Spring, and Hibernate. Ensure systems meet strict non-functional requirements-scalability, availability, and performance. Collaborate across teams to integrate backend services with payment gateway components. Support the adoption of Nexo and other payment standards to future-proof the platform. Troubleshoot complex backend issues, perform … code reviews, and uphold engineering best practices. What You'll Bring 5+ years' experience as a Java Backend Developer in a high-transaction or enterprise environment. Strong skills in Java, Spring, Hibernate, and microservices architecture. Familiarity with payment systems, APIs, and protocols. A problem-solving mindset with excellent teamwork and communication skills. If you're passionate about More ❯

Backend Java Developer 12-Month Contract Onsite | Nenagh, Ireland | 5 Days per Week We're seeking an experienced Backend Java Developer to join our client's engineering team in Nenagh. This is an excellent opportunity to contribute to a high-transaction, enterprise-scale payment platform used globally. What You'll Do Develop and maintain secure, high … performance backend systems for payment processing. Design and optimise scalable microservices and APIs using Java, Spring, and Hibernate. Ensure systems meet strict non-functional requirements-scalability, availability, and performance. Collaborate across teams to integrate backend services with payment gateway components. Support the adoption of Nexo and other payment standards to future-proof the platform. Troubleshoot complex backend issues, perform … code reviews, and uphold engineering best practices. What You'll Bring 5+ years' experience as a Java Backend Developer in a high-transaction or enterprise environment. Strong skills in Java, Spring, Hibernate, and microservices architecture. Familiarity with payment systems, APIs, and protocols. A problem-solving mindset with excellent teamwork and communication skills. If you're passionate about More ❯

Java Developer Hybrid (Belfast) 6-Month Contract Inside IR35 Our client, a leading organisation within the financial services sector, is seeking an experienced Java Developer to join their Belfast-based technology team on an initial 6-month contract (Inside IR35). This is an excellent opportunity to work on high-performance, data-driven applications within a More ❯

Role: Java Developer Location: Hybrid travel to client site 2-3 days per week. Rate Outside IR35: £500.00 - £550.00 Clearance: Active SC Clearance (Must hold Active SC) We are seeking an experienced and hands-on Java Developer with a strong understanding of Java to join our team. The ideal candidate will have a solid background … reporting in the event of delays, proactively manage dependencies, and work with team members to resolve issues impacting delivery. Required Qualifications: - Minimum of 3 years of experience as a Java Developer. - Strong understanding of functional programming principles and Test-Driven Development (TDD). - Experience with relational and NoSQL databases. - Familiarity with cloud platforms such as AWS, Azure, or GCP. More ❯

Role: Java Developer Location: Hybrid travel to client site 2-3 days per week. Rate Outside IR35: £500.00 - £550.00 Clearance: Active SC Clearance (Must hold Active SC) We are seeking an experienced and hands-on Java Developer with a strong understanding of Java to join our team. The ideal candidate will have a solid background More ❯

We are urgently seeking a highly skilled SC Cleared Java Backend Developer to join a critical project with a high-profile Government Client . This is a key technical role focusing on a vital component of the client's technology landscape: migrating a legacy message queueing system to a modern, scalable platform. ?? Key Requirements & Scope: The core objective … role is to replace the existing IBM MQ Series with Kafka across the platform. We are therefore looking for a rare and specific combination of skills: Deep expertise in Java (Backend Development). Strong, hands-on experience with Kafka (implementation, configuration, and integration). Essential knowledge of IBM MQ Series (or similar legacy messaging systems) to facilitate a seamless … integration. Ability to work in a fast-paced environment and deliver solutions to high government standards. Essential Criteria: Active SC (Security Check) Clearance is mandatory. Strong commercial experience with Java Backend Development. Proven experience with Kafka and IBM MQ Series migration projects. Excellent communication and problem-solving skills. Offer Details: Rate: £525 per day IR35 Status: Inside IR35 Location More ❯

Senior Java Developer Contract Dublin 6-18 Months. My client a leading global name is in urgent need of a talented and experienced Senior Java Developer to join their team on a contract basis 6 months initially rolling up to potentiality 18-20 months. My client is looking for a senior developer to perform hands … and knowledge sharing activities and grow your network of top-notch people who are best at what they do. Successful candidates will have 10+years of commercial experience in core Java/J2EE application development and object-oriented design. Strong skills in multi-threading, collections framework, JDBC and knowledge of Java profiling tools. Proficiency with frameworks just as Spring More ❯

Role: Java Developer Location: Remote Inside IR35 £550.00pd Must Hold Active SC Clearance We are seeking a JBOSS Developer to join our team. In this role, you will have the opportunity to work closely with stakeholders and team members while leveraging your expertise in Red Hat JBoss Enterprise Application Platform and alternative J2EE Application Servers. Key Skills … with the Authority team to refactor or redevelop existing application components currently dependent on JBoss to operate within the selected technology stack, including: - Remove backend functionality that requires proprietary Java where required. - Change front-end interactions that require proprietary Java to use the new solution where required. - Update and/or change authentication mechanisms (Keycloak) and remove the … and adapting appropriate software development methods, tools, and techniques. - Collaborate with the Authority project team to drive technical development across all stages and iterations of software development. Key Competencies: - Java - Java Enterprise Editions (JEE) - Keycloak More ❯

Senior Java Developer Join one of Galway’s most respected tech teams, a company known for high employee satisfaction, genuine flexibility, and solving complex problems with modern tech. We’re assembling a new team of engineers to design and build high-performance, secure, and scalable applications at the forefront of digital ownership and blockchain innovation . Data is … it’s processed, engineered, and used to deliver real impact. What you’ll do Build and scale large-scale enterprise applications used by millions. Work hands-on with modern Java, Spring Boot, and cloud technologies (AWS a plus). Collaborate in Agile squads alongside top-tier engineers. Get involved in next-gen technologies - Blockchain, AI Agents, and advanced data … engineering. What you bring 5+ years’ experience building modern web apps with Java. Expertise in Java, Microservices, Spring Boot, and Cloud (AWS preferred). Exposure to modern JavaScript/TypeScript frameworks is a nice to have, they have many applications running on Angular, & Node. Solid grasp of CI/CD pipelines and test-driven development. An agile mindset and More ❯

Full Stack Developer Java/Angular Location: Galway Model: Hybrid Term: 12+ months | Rate: Top-tier day rate Full Stack Java/Angular Developer required for a great long term contracting role with a leading organisation who have a large presence in Galway. You’ll work in modern technology department focussing on a small number of … enterprise projects. There’s scope and variety in the role with a range of modern tools, tech and processes. Desired Skills/Experience 5+ years Java development experience Solid exposure to Angular OR React, ideally at least a year of recent experience working with modern TypeScript libraries Familiar with Spring boot and building out microservices for cloud native applications. More ❯

Senior Java Developer Location: Galway Model: Hybrid Term: 12+ months | Rate: Top-tier day rate Senior Java required for a great long term contracting role. You’ll work in modern technology department focussing on a small number of enterprise projects. There’ scope and variety in the role with a range of modern tools, tech and processes. Even … as a contractor there’s a strong chance you’ll get to work on tools and tech that are new to you. Desired Skills/Experience 5+ years Java development experience Strong experience across Spring/Spring boot building out microservices Ideally some exposure to modern JavaScript/TypeScript frameworks, not essential but would be nice. An interest in More ❯

We are urgently seeking a highly skilled SC Cleared Java Backend Developer to join a critical project with a high-profile Government Client . This is a key technical role focusing on a vital component of the client's technology landscape: migrating a legacy message queueing system to a modern, scalable platform click apply for full job details More ❯

Lead Developer - Live Services Java Patching Rate: £508 per day Start Date: 24th November (TBC) Location: Remote/On-site as required Telford Security Clearance: Active SC preferred due to timescale of the project We are seeking an experienced Lead Java Developer to oversee and deliver a critical Live Services Java Patching Programme within Central … Government. This role involves upgrading legacy Java applications to meet contractual and compliance requirements, ensuring continued stability, performance, and security across live environments. The successful candidate will take a leading role in planning, coordinating, and executing the patching exercise, working closely with a small development team and key stakeholders to deliver high-quality outcomes. Key Responsibilities: Lead the end … to-end Java patching and upgrade process for live Central Government services. Ensure all upgrades meet technical, contractual, and security compliance standards. Collaborate effectively with development teams, project managers, and service owners. Provide technical leadership, mentoring, and quality assurance within the team. Maintain comprehensive documentation and reporting throughout the upgrade lifecycle. Essential Skills and Experience: Proven expertise in Java More ❯

Fidessa Developer - Java/Spring - sought by investment bank based in London - Contract - Hybrid *inside IR35* Key Responsibilities Develop and customise the Fidessa cash equities order management systems for US and Canadian markets. Translate business requirements into technical solutions using Fidessa and Java. Collaborate with global teams to deliver high-quality solutions. Provide mentorship to new team members … line technical issues as needed. Essential Skills & Experience 5+ years of hands-on development experience with the Fidessa trading platform . Strong understanding of equities trading . Proficiency in Java (including Spring framework) and Python . Excellent interpersonal, communication, and organisational skills. Desirable Skills Knowledge of other asset classes in Capital Markets. Experience with tools such as GitHub, Maven More ❯

Fidessa Developer - Java/Spring - sought by investment bank based in London - Contract - Hybrid *inside IR35* Key Responsibilities Develop and customise the Fidessa cash equities order management systems for US and Canadian markets. Translate business requirements into technical solutions using Fidessa and Java. Collaborate with global teams to deliver high-quality solutions. Provide mentorship to new team members … line technical issues as needed. Essential Skills & Experience 5+ years of hands-on development experience with the Fidessa trading platform . Strong understanding of equities trading . Proficiency in Java (including Spring framework) and Python . Excellent interpersonal, communication, and organisational skills. Desirable Skills Knowledge of other asset classes in Capital Markets. Experience with tools such as GitHub, Maven More ❯

I am working with a consultancy looking for a Java developer to join a contract. This will involve working with Java code and CI pipelines with GitLab CI to improve, tune and extend so that when we get dependency updates or security fixes from engineering tooling we then automate the testing and deployment of these services all … the way to production in a controlled and secure way. Tech stack - Java engineer needs experience with spring boot framework, TDD, Grafana and Prometheus for monitoring and alerting and understanding of the CI/CD process.All candidates must pass a BPSS.Immediate start.End March 2026.Weekly travel to Leeds/Newcastle/Manchester.£400 - £500 per dayInside IR35 More ❯