51 to 75 of 91 Java Jobs in Portsmouth

ability to translate customer needs into actionable technical requirements Experience managing multiple concurrent implementation projects with enterprise customers Knowledge of APIs & software development (Python, Java), data pipelines, and enterprise integration architectures Proven success in enterprise software implementations, balancing technical execution with customer business needs Experience leading technical enablement, training, or More ❯

Job Opportunity: Freelance Java Developer (Outside IR35) £450–£550/day | Remote (UK-Based) | Occasional travel to Hammersmith or Farnborough We’re looking for an experienced Freelance Java Developer to join a long-term programme focused on building scalable, cloud-native platforms within the Financial Services Payments sector. This is … ideal for someone who takes ownership, thinks like an engineer, and enjoys working in a collaborative, delivery-focused team. What You'll Bring Strong Java development experience (Spring Boot, Microservices) Proficiency with AWS services (Java Spark, EMR, Lambda, native AWS databases) Experience with Kubernetes and EKS Strong understanding of cloud More ❯

Looking to play your part in a revolutionary movement with sustainable energy? Are you a Core Java expert with extensive experience using concurrency, low latency and multithreaded applications? FULLY REMOTE Senior Java Engineer - Tech for Good Salary: up to £120k Location: Fully Remote from anywhere in the UK We have … a fantastic new opportunity for all you Java Engineers looking to get stuck into a new challenge working on exciting projects solving real-world problems. They are also very big supporters of Diversity & Inclusion so welcome all candidates. A unique energy software platform helping consumers transition towards a sustainable future … are looking for enthusiastic and knowledgeable Senior Java Engineers with a strong comprehension of the Core Java principles, including Multithreading, Concurrency and Low Latency to join their growing team. In this fantastic Senior Java Engineer role: You will have ownership over your projects Be involved in the end-to-end More ❯

on customer needs and satisfaction, setting high standards for quality and quantity. Desired Skills and Experience: Dynamics 365 Accreditations Proficiency in C#, ASP.Net, Python, Java, JSON Experience with enterprise CRM systems Proven track record in delivering complex projects Strong customer engagement and management skills If the above opportunity is of More ❯

that are robust and efficient. (Looking at going down Snowflake or BigQuery) Utilize your expertise in backend languages; the tech stack is flexible, including Java, Python, .NET, Ruby, and more. Implement strong coding principles, including CI/CD, TDD, and maintain high-quality code standards. Bring a deep passion for More ❯

environment - SQL - Data Protection/GDPR - expert English language - GIT/GITHUB - adaptable to different programming languages if required; perhaps especially Android Studio/Java We are open to discussions about the hours that would suit you, as well as work location (e.g. remote working and/or from our More ❯

iO Associates is looking for a Java Full Stack software developer, to work for a global pioneer in the aerospace industry, operating in the commercial aircraft, helicopters, defence, and space sectors. You'll play a key role in a cutting-edge satellite mission, developing scalable, distributed systems in a secure … delivery are central to the programme's success. Location: Portmouth, UK Daily rate: up to £55 per hour Inside IR35 Working pattern: Hybrid Requirement: Java Core (8+), Spring Boot, Hibernate RESTful Web Services, Microservices UML/SysML (ideally Enterprise Architect) Agile/Scrum methodology, CI/CD practices GIT, Jira … distributed systems experience Aerospace, defence, or high-assurance systems background (highly preferred) Responsibilities: Develop high-quality, secure code in Java (8+) using Spring Boot and REST APIs Participate in UML-based design and architecture Implement microservices for satellite management systems Contribute to automated testing, sprint planning, and continuous delivery if More ❯

iO Associates is looking for a Java Full Stack software developer, to work for a global pioneer in the aerospace industry, operating in the commercial aircraft, helicopters, defence, and space sectors. You'll play a key role in a cutting-edge satellite mission, developing scalable, distributed systems in a secure … delivery are central to the programme's success. Location: Portmouth, UK Daily rate: up to £55 per hour Inside IR35 Working pattern: Hybrid Requirement: Java Core (8+), Spring Boot, Hibernate RESTful Web Services, Microservices UML/SysML (ideally Enterprise Architect) Agile/Scrum methodology, CI/CD practices GIT, Jira … distributed systems experience Aerospace, defence, or high-assurance systems background (highly preferred) Responsibilities: Develop high-quality, secure code in Java (8+) using Spring Boot and REST APIs Participate in UML-based design and architecture Implement microservices for satellite management systems Contribute to automated testing, sprint planning, and continuous delivery if More ❯

iO Associates is looking for a Java Full Stack software developer, to work for a global pioneer in the aerospace industry, operating in the commercial aircraft, helicopters, defence, and space sectors. You'll play a key role in a cutting-edge satellite mission, developing scalable, distributed systems in a secure … delivery are central to the programme's success. Location: Portmouth, UK Daily rate: up to £55 per hour Inside IR35 Working pattern: Hybrid Requirement: Java Core (8+), Spring Boot, Hibernate RESTful Web Services, Microservices UML/SysML (ideally Enterprise Architect) Agile/Scrum methodology, CI/CD practices GIT, Jira … distributed systems experience Aerospace, defence, or high-assurance systems background (highly preferred) Responsibilities: Develop high-quality, secure code in Java (8+) using Spring Boot and REST APIs Participate in UML-based design and architecture Implement microservices for satellite management systems Contribute to automated testing, sprint planning, and continuous delivery if More ❯

Capital, Apexon now has a global presence of 15 offices (and 10 delivery centers) across four continents. Job Title: Software Developer in Test (SDET) - Java Location: United Kingdom About Us We are a leader in the fintech space, driven by innovation and committed to delivering a seamless customer journey that … Selenium, GitLab . Skilled in automating API tests and leveraging APIs for test setup and teardown. Strong expertise in creating test automation code using Java . Solid experience with various types of testing (Component, Integration, End-to-End, Functional, Non-Functional). Comprehensive understanding of testing principles, processes, methodologies, and 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 … 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 … 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 More ❯

Shape architecture and ship new features - Build something that genuinely helps people What we’re looking for: - Strong experience in Swift and Kotlin/Java - Must have built apps from scratch - Must be happy working independantly - End-to-end app launch experience - Solid UI/UX instincts - UK-based (remote More ❯

Tech Stack Over 10 years’ experience in Software Architecture with enterprise experience Architecture of Development experience which encompasses SaaS or API based platforms .NET, Java or OOP background HTML, CSS, JavaScript Database design, caching, systems integration Benefits Package Remote Annual bonus £500 home office set up £60 pcm WFH costs More ❯

a relevant field. 10+ years in application and enterprise architecture roles. Proven experience designing SaaS-based systems and external-facing APIs. Proficiency in .NET, Java, or similar languages, with a broad technical skillset spanning frontend and backend development. Strong understanding of systems integration, middleware, caching, databases, and web performance optimisation. More ❯

Development Engineer in Test who is passionate about quality, reliability, and secure software development. In this role, you’ll be responsible for testing a Java-based codebase that powers our secure coding labs and training platform. Your mission is to ensure our software is reliable, robust, and meets the highest … standards of quality. Key Responsibilities Design, develop, and maintain test plans, test cases, and automated test scripts for Java-based systems, with a focus on both functionality and security. Perform functional, regression, integration, and system-level testing. Validate business logic, user workflows, and secure handling of data across our platform. … Create and manage automated test suites using tools compatible with Java (e.g., JUnit, TestNG, Selenium, REST Assured). Validate REST APIs, backend services, browser-based interfaces, database interactions, and multi-threaded service components using manual and automated approaches. Participate in regression and exploratory testing to uncover edge-case issues. Participate More ❯

to work for a GreenTech company in zero tech debt that is committed to being the industry's top platform for a sustainable future? Java Software Engineer - GreenTech Start up! £60-90K + benefits Fully remote from anywhere in the UK We are partnered with an ‘energy-as-a … service’ platform, that was created to help both customers and suppliers advance the energy revolution. They are urgently looking for Java Software Engineers to join their rapidly growing team. Innovation is highly important to this company; they are looking for Java Software Engineers who wish to dominate the market and … As a technology company, they only complete GREENFIELD work, building and developing all frameworks, databases and tools from scratch. Tech stack required as a Java Software Engineer: · Core Java · C · Experience with APIs · Microservices · Multithreading, concurrency & high throughput · AWS · Kubernetes Benefits you will enjoy as a Java Software Engineer: · Pension More ❯

Urgent Requirement – Java Lead/Architect Contract/Remote We’re looking for a hands-on Java Lead/Architect to drive a high-impact data integration and transformation project. You’ll lead two developers, set technical direction, and roll your sleeves up with Java and XML-heavy workstreams. Key … Tech: Java 8+, Spring Boot, Camel XML (XSD, XPath, XSLT, Schematron) Canonical data modelling & semantic structures AWS deployment of transformation pipelines Tools like Altova, XStream, MaterialUI Bonus if you know: Finvoice, Peppol, UBL, TEAPPS, B2B/EDI exchange formats You’ll need to be: Equally comfortable leading and coding Strong More ❯

Mid level Java Developer - 9 month contract - Hybrid - start ASAP This role will involve software development across multiple microservices. Need experience in: Strong knowledge and extensive experience of modern Java technologies, frameworks, and design principles. specifications. Test-Driven Development (TDD) and Behaviour Driven Development (BDD) practices and techniques. Will be … writing unit tests for java services that meet a set criteria of coverage that will be automatically tested as part of our CI/CD process. Knowledge and experience of APIs (Open API/Swagger), RESTful services and Microservice Architectures. Strong knowledge and extensive experience of developing on cloud-based More ❯

you will need: 10 plus years of experience in Software design and coding experience with external API platforms. Experience with C#/.NET or Java Experience with System Integration Experience identifying and resolving performance and scalability issues for both web-based applications and databases. Payments experience would be a huge More ❯

Senior Java Developer 📍 UK-based | Remote-first with occasional London/northern meetups 🕒 Full-time | Salary: £70,000 – £90,000 What you’ll be doing Develop and maintain Java-based systems across multiple businesses Gradually modernise legacy code, introducing cleaner architecture and better development practices Work closely with onshore and … strategy and play a key role in shaping our future stack Support a secure and compliant development environment What we’re looking for Solid Java development experience Comfortable working with and improving legacy codebases Familiarity with AWS and cloud-based systems Good communication skills and collaborative mindset Experience in (or More ❯

Senior Software Engineer – Java - FinTech Remote First | London (UK) | Up to £120k + Benefits Are you a Java developer who thrives in a collaborative, test-driven environment? Do you believe in pair programming, continuous integration, and clean, maintainable code? If so, we’d love to hear from you. Our FinTech … client could be the ideal role for you.... Skills: Commercial Java experience - ideally in a fintech, performance environment Strength with Core Java Strong understanding of TDD Clear communication and teamwork Extreme Programming (XP) principles, with a strong focus on TDD, BDD, and DDD. Pair programming cultur e ensures high-quality … is key. We value growth and flexibility, welcoming developers from all backgrounds. What You’ll Be Doing Building resilient and adaptable fintech platforms in Java Refactoring to improve code design Writing comprehensive tests for every commit Automating processes to improve efficiency Rotating across teams to enhance collaboration More ❯

Head of Backend (Java) B Corp Certified - Fintech Remote Working (UK Based) Salary up to £150,000 Base + Bonus SR2 are partnering with a long term B Corp Fintech client of ours, supporting them in recruiting for a permanent employee who with be heading up their Java team who … round. The role is remote working, but will require you to meet occasionally with the CTO who is East Midlands based. The Head of Java role is a critical leadership role in the business, you will be guiding the Java development team, leading from the front in terms of innovation … your team and setting the technical direction. Experience Needed: Strong Leadership/Team Management: The ability to mentor, coach and inspire a team of Java Engineers towards technical excellence, whilst fostering a positive, hands on and collaborative environment. Deep knowledge/expertise of backend development & Microservices: Solid understanding of API More ❯

and technical excellence Own backend architecture and strategy, ensuring systems are scalable, reliable, and secure Play a hands-on role in development, especially in Java (ideally with Quarkus/GraalVM, or SpringBoot as an alternative) Oversee backend API design and integration, including messaging platforms such as Pub/Sub Define … Maintain high standards in software quality, testing, and maintainability What we’re looking for: 10+ years in software engineering, with 7+ years in backend Java development Strong experience building distributed systems and microservices Proven leadership of engineering teams with the ability to coach, delegate, and develop others Hands-on expertise … in Java, with a strong preference for Quarkus or GraalVM; SpringBoot experience also considered Familiarity with messaging systems such as Pub/Sub, Kafka, or RabbitMQ Strong understanding of REST API design, CI/CD practices, and Agile methodologies Experience in fintech, payments, or banking domains Who this suits: Someone 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 … 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 … 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 More ❯

We are looking for a Principal Vulnerability Engineer who will be part of the security vulnerability team for the Java platform. This team conducts both the red team (offensive) and blue team (defensive) duties. Responsibilities will include proactive research, security tooling, assessments, and assisting development teams with security code review. … Qualified candidate must have at least 10+ years of hands-on experience in platform security, deep knowledge of Java security model is a must. Minimum 10+ years of hands-on experience with security protocols and best practices are required. Ideal candidate is expected to work independently on assigned tasks. Proven … past experience in successful security incident resolution and proactive research utilizing industry standard tools is a must-have. Past research and CVEs on Java security issues are a plus. Must have proficiency in Java, and expert level C/C++ skills, and systems level programming. Great personal leadership, self-starter More ❯