1 to 25 of 87 Part-Time Java Engineer Jobs

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 More ❯

Java Engineer – Cloud (GCP or AWS) | Scalable Systems | Product Environment Are you a Java engineer who thrives on building scalable, cloud-native systems? Want to make a tangible impact on modern product development in a fast-moving team? My client is looking for a Java Engineer with strong experience in either Google Cloud Platform (GCP) or Amazon Web Services (AWS) to join their high-performing engineering team. You’ll be developing robust, distributed systems and contributing to cloud infrastructure in a product-focused environment. Key Responsibilities: Design, develop, and deploy high-performance backend … testing, and resilience of services. Take ownership of cloud infrastructure components using GCP or AWS services. Essential Skills and Experience: Strong commercial experience with Java (Java 11 or newer) . Hands-on experience with GCP or AWS , including services such as Cloud Run, Pub/Sub, BigQuery, S3 More ❯

Senior Java Engineer Bristol (Hybrid) | Salary: up to £80,000 The Role We have an exciting opportunity for an accomplished Senior Java Engineer to guide a high-performing engineering team at global provider of enterprise SaaS solutions for the financial services. This is a hybrid position … clean, efficient code while mentoring others and shaping modern, scalable systems. Primary Responsibilities Take the lead in building cutting-edge backend solutions with modern Java (17+), setting the standard for clean, efficient code. Empower and mentor a talented Java engineering team, fostering growth and best practice. Champion engineering … by side with Product, UX, and fellow tech leaders to deliver innovative features that drive real user value. Essential Skills & Experience (Expert-Level Required) Java (17+) and Spring Boot. Microservices, REST APIs, performance tuning, and multithreaded programming. Architecture and design of scalable, high-performance software. Relational database design (PostgreSQL More ❯

leadership teams across FTSE companies, private businesses and major government departments in order to transform their organisations. We are currently looking for a Senior Java Software Engineer to work with a broad range of blue-chip companies and public sector organisations. As a Senior Java Engineer … working on projects that employ cutting edge technologies and deliver high profile solutions that make a genuine difference to everyday life. A Successful Senior Java Software Engineer Will Have: Strong object-oriented programming principles in Java. Extensive experience in leveraging Java 8 features. Domain/Sector/… RESTful services using JAX-RS. Experience in hosting and orchestration using Docker, Kubernetes and AWS Autoscaling Groups. Experience in a position of leadership. Senior Java Software Engineer Key Details: Up to £75k Salary. 10-20% discretionary bonus. Hybrid Working. Travel allowance. Requires eligibility for SC Clearance. If this More ❯

Software Engineer - Java OR C++ Gloucestershire/London - 4 days on-site A global leader in aerospace, defense, and advanced technologies is looking for a permanent Software Engineer (Java/C++). This company is at the forefront of developing cutting-edge solutions for national security … British national with active SC or DV clearance. Candidates eligible and willing to undergo DV vetting will also be considered. Key requirements : Proficient in Java, and/or C++ Experience in JavaScript/TypeScript & React Experience of developing on Linux. Knowledge of mocking up and unit testing frameworks such 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 … 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 More ❯

Senior Java Software Engineer - Java, Spring boot, Terraform, AWS, React, TypeScript Location: Remote, occasional travel to the office Salary: Up to £75,000 + benefits Why Apply? Play a pivotal role in designing, building, extending an end to end procurement platform aimed at customers in the public … will provide technical leadership, mentor colleagues, and actively contribute to continuous improvement initiatives, making best use of modern cloud practices and innovative solutions. Senior Java Software Engineer - Responsibilities Design, develop, and maintain robust Java applications hosted in AWS, ensuring scalability and performance. Collaborate with team members and … tested. Take ownership of troubleshooting, debugging, and resolving complex production issues. Mentor junior developers by providing guidance, conducting code reviews, and sharing knowledge about Java and AWS best practices. Proactively identify and implement improvements to development processes and infrastructure automation using CI/CD (e.g., GitHub Actions). Monitor More ❯

Senior Java Software Engineer - Java, Spring boot, Terraform, AWS, React, TypeScipt Location: Remote, occasional travel to the office Salary: Up to £75,000 + benefits Why Apply? Play a pivotal role in designing, building, extending an end to end procurement platform aimed at customers in the public … will provide technical leadership, mentor colleagues, and actively contribute to continuous improvement initiatives, making best use of modern cloud practices and innovative solutions. Senior Java Software Engineer - Responsibilities Design, develop, and maintain robust Java applications hosted in AWS, ensuring scalability and performance. Collaborate with team members and … tested. Take ownership of troubleshooting, debugging, and resolving complex production issues. Mentor junior developers by providing guidance, conducting code reviews, and sharing knowledge about Java and AWS best practices. Proactively identify and implement improvements to development processes and infrastructure automation using CI/CD (e.g., GitHub Actions). Monitor More ❯

Role: Java Software Engineer/Java Developer 🌍 Location: Central London - hybrid 2 days a week onsite 💰 Salary: £40,000-£55,000 🛠 Key Skills: Core Java/SE, XML, JSON, Junit, APIs, complex/high-traffic systems A leading global B2B SaaS technology company is seeking Java … volume XML integrations, time-sensitive bug fixes, and contributing to innovative new features and products. Key Responsibilities: Develop and maintain robust backend systems in Java (Java 17). Work on complex system integrations with third-party suppliers and distributors. Handle XML feeds, web scraping, and high-frequency search … issues. Collaborate on product design and contribute to new functionality. Work both independently and in agile teams with shifting priorities. Required Skills and Experience: Java SDK/J2SE programming knowledge. Understanding of algorithms, data structures, and object-oriented design patterns. Proactive attitude and ability to take ownership of projects. More ❯

Senior Engineer - Java, React.js, Node.js, SQL, AWS London, UK - Hybrid (2 days a week in office) Permanent £75,000 - £90,000 Got a passion for tackling tough challenges and making a real difference? My client, a forward-thinking and impactful organisation at the forefront of developing cutting-edge … solutions to combat online fraud, is on the lookout for a sharp Senior Java Engineer to join their collaborative team. You'll be right in the thick of it, building and improving systems that genuinely help protect people. Plus, you'll get to connect with smart folks across … to-day: Keeping their current systems running smoothly and making them even better. Getting creative and building new features and products from scratch. Using Java to create software that's not just good, but rock-solid, scalable, and lightning-fast. Making different systems talk to each other through APIs. More ❯

Job Title: Java Engineer - Trading Location: London Salary Up to £90,000 base + discretionary Bonus Company: Our client is a prestigious trading firm located in the heart of London. With a strong focus on multi-strategy, multi-asset trading, they have consistently excelled in the dynamic and … fast-paced world of financial markets. They are currently seeking two Java Engineers to join their elite team and drive the development of mission-critical software solutions. Position Overview: As an Engineer at our client's firm, you will play a pivotal role in developing and maintaining the … trading systems. Collaborate closely with traders and quantitative analysts to understand their requirements and translate them into robust software solutions. Architect, develop, and optimize Java-based trading applications. Ensure the reliability, scalability, and performance of mission-critical systems. Stay up-to-date with industry best practices and emerging technologies More ❯

Lead Java Engineer. Location: London, Fulltime Onsite Salary: £100,000-140,000 Lead Java Engineer with expertise in Core Java required to join a fast-growing company that's on its way to becoming a major player in cybersecurity. The company is expanding rapidly and building … to tackle complex challenges. Wanted are individuals who seize the opportunity to engage in research and experimentation, continuously enhancing and advancing solutions. Requirements: Core Java development That's it, we are interested in candidates from a broad background will consider any technology stack working around Java programming. You … consider yourself a true engineer You can logically think through problems rather than just the answer. You have a deep passion for Software Development. You have experience working in environments that leverage pair programming to drive research and development. The companies Technology Stack: Core Java for applications React.js. More ❯

Mid-Level Java Engineer My client is a leading financial services firm dedicated to providing innovative solutions and cutting-edge technology in the finance sector. With a commitment to excellence, they are seeking a talented and experienced Mid-Level Java Engineer to join our dynamic team. … passionate about finance, technology, and thrive in a collaborative environment, we invite you to apply. Responsibilities: Design, develop, and maintain high-performance and scalable Java applications. Collaborate with cross-functional teams to understand project requirements and translate them into technical specifications. Implement best practices for software development, ensuring code … contribute to a culture of continuous improvement. Qualifications: Bachelor's degree in Computer Science, Engineering, or related field. 3+ years of professional experience in Java development. Solid understanding of Kotlin and experience in using it for building robust applications. Proficiency in the Spring framework, including Spring Boot. Hands-on More ❯

Software Engineer/Developer (Java 17 Kotlin AWS) London/WFH to £85k Are you a technologist Software Engineer with strong Java skills looking to progress your career, working with a modern cloud based infrastructure and a range of technology? You could be joining a hugely … successful and growing commodities trading firm that specialise in trading whiskey. As a Software Engineer you'll collaborate with the Lead Engineer on the whiskey trading platform as the company looks to scale the platform and introduce new features. There's an emphasis on code quality; designing and … developing highly complex web based trading platforms working across the full development lifecycle. The technology stack includes Java 17, Kotlin, Spring Boot and AWS amongst others; you'll be encouraged to expand your skillset using the latest technologies and choosing the best tool for the job in a friendly More ❯

Senior Java Engineer – Core Java, Algo, Distributed Systems Location: Belfast – 2/3 days per week needs to be possible (only considering candidates in NI) Type: Contract Industry: Investment Banking Duration: ASAP – long term (12 months to start with extensions) We’re seeking Senior/Lead Java … systems that support trading across Equity Swaps, Delta One, and Prime Brokerage. While low-latency expertise is not essential, a deep command of Core Java and algorithmic/data structure proficiency is critical to succeed in this complex and performance-sensitive environment. Key Responsibilities: Design and enhance trading engines … microservices architecture , and contribute to distributed system designs. Lead database migrations from legacy systems (e.g., Sybase , DB2 ) to modern platforms. Required Skills: Strong Core Java expertise, with a focus on performance tuning and optimisation . Solid understanding of algorithms , data structures , and concurrent distributed environments . Proven experience with More ❯

Java Software Engineer – Asset Management Technology 💸 Up to £100,000 + bonus + benefits 📍 Hybrid – 2 days/week in Central London Join a cutting-edge, cloud-native SaaS company backed by one of the UK’s leading global asset managers as a Java Software Engineer … open architecture platform that puts control in the hands of the user – whether for multi-asset, single-asset, or transformational investment businesses. As a Java Software Engineer , you’ll be part of a high-performing team building distributed, low-latency systems designed for speed, scale, and resilience. 🧠 What … They’re Looking For: 2+ years’ commercial experience with Java Solid grasp of multithreading, concurrency , and high-throughput system design A passion for TDD, pair programming , and continuous delivery practices Computer Science degree from a Russell Group university 💻 Tech Stack: Java | AWS | Multithreading | Kafka | ActiveMQ | MongoDB | DevOps Tooling More ❯

Position: Lead Software Engineer Location: Manchester (Hybrid – 2 days per week in office) Salary Range: £85,000 – £140,000 Our client is shaping the next chapter of digital banking with one of the biggest and most innovative banking software projects in Europe. We’re looking for innovative minds to … help lead the way. If you're a hands-on Java engineer with a passion for scalable architecture and modern cloud-native development, this is your chance to work on something big. You’ll take a key role in a strategic engineering team that’s focused on designing … by architecting/building performant services and APIs which support innovative financial products. What You’ll Do Lead engineering efforts on backend services in Java, built for cloud deployment and aligned with modern software architecture principles. Design and maintain integration layers and orchestration services that connect Vault with various More ❯

Senior Software Engineer - Full Stack Engineer- Java, React, Spring Boot An exciting opportunity to join an innovative SaaS provider in the online gaming space. Work with top-tier clients in the UK and USA, contributing to the development of new software solutions within a rapidly expanding company. … Work within their software engineering squads to develop new and modernize legacy applications using microservices. You'll primarily focus on Java backend, with a practical understanding of frontend development. As such you will need: Expertise in core Java development Spring Boot Commercial JavaScript experience Strong React Any NoSQL More ❯

Type: Inside IR35 Start Date: May 2025 Duration: 6 months to 12 months (possibility of extension) Job Overview: We are seeking a highly skilled Java Engineer with strong DevOps expertise for a hybrid role that blends deep backend engineering with modern infrastructure practices. You’ll be part of … This role is ideal for someone who thrives in complex, high-scale environments and has a passion for building robust, reactive systems using modern Java frameworks. Roles and Responsibilities: Design and implement highly scalable and reactive backend systems in Java. Utilize reactive programming frameworks like Kafka Streams , Akka , Eclipse … Vert.x , or Apache Flink . Leverage Java concurrency features including multithreading and Executor Services to ensure optimal performance. Apply functional programming paradigms in Java to write clean, efficient, and maintainable code. Champion sound engineering practices including SOLID principles , unit testing , and clean code methodologies. Deploy and manage containerized More ❯

whose innovative products are making a true impact across multiple industries. As the business continues to scale, they're now looking for a Senior Java Engineer to take a key role in shaping the evolution of their core platform. This is the perfect opportunity for a Senior Software … Engineer with previous exposure to design and architecture to step up and take on a more senior role in a scaling software engineering team. You'll be joining a small but high-performing, collaborative engineering team, contributing not just code but also technical direction, architectural leadership, and mentorship to … What You'll Be Doing Take ownership of a key function within the company's core software platform, designing and architecting scalable, cloud-native Java applications. Lead by example in adopting best practices and modern development approaches. Collaborate across disciplines, particularly with product teams and hardware engineering, to deliver More ❯

Contract - 12 months (Inside IR35) - Java Developer (Front Office) Synechron's global consulting firm combines creativity and innovative technology to deliver industry-leading digital solutions. Synechron’s progressive technologies and optimization strategies span end-to-end Artificial Intelligence, Consulting, Digital, Cloud & DevOps, Data, and Software Engineering, servicing an array … or LinkedIn community . Are you passionate about bringing systems to life? Do you have the drive to innovate? We are looking for a Java Developer who has worked in Front Office, Capital Markets environment. Required Skills/Experience: 7 + years hands on Java development experience in … a front-office environment Capital markets experience Java – Java 8+, Spring Boot, Microservices, Kafka, DB Strong Java script knowledge in React or Angular is useful Python – flask You'll be required to work in our or our clients office 3 days per week (both City based More ❯

Senior Software Engineer Java/Spring Boot/Python £400-435.00 per day, Outside IR35 Start ASAP - initially until the end of September (+ Likely extensions) Fully Remote - Must be UK based One of our valued partners requires the services of 2 x highly experienced Senior Software … essential! Technical Skills Required: Python, Flask framework experience or any experience on other MVC front-end frameworks Javascript and html experience Spring Boot 3 Java 17, 21 OpenShift Cloud environment, experience in any of the cloud platforms Azure, GCP, AWS - nice to have Rest API(s) PostgreSQL or any More ❯

Backend Software Engineer/Developer London onsite to £160k Are you a Java technologist with strong knowledge of software engineering best practices and backend development experience looking for an opportunity to progress your career in a senior, hands-on role with complex and challenging work? You could be … joining a scaling Cyber Security technology company that has just received £100 million investment. As a Backend Software Engineer you'll join a small, Agile team using core Java within a TDD environment deploying to AWS. You'll design and develop new features and enhancements across two security … week with a wide range of facilities and an array of perks including free, chef cooked meals. About you: You have strong backend core Java development skills You have a strong knowledge of software engineering best practices and have experience with TDD You have a good knowledge of SQL More ❯

Regulatory Reporting Engineer - Java Salary: Up to £130,000 + Bonus + Benefits Role Type: Permanent Position Office Location: Central London Hybrid Model: 3 days per week in office, 2 days remote About the Role: We’re looking for a Lead Reporting Engineer with a strong Java … up a small, agile team focused on end-to-end reporting solutions—spanning regulatory and strategic platforms. This role combines hands-on development with Java , Spring Boot , SQL , and data frameworks, alongside leadership in project delivery and resource planning. You’ll serve as a subject matter expert (SME) across … and security teams to deliver robust, enterprise-grade solutions. Key Responsibilities Lead the design and development of reporting applications with a strong focus on Java (C#/.NET experience also valuable). Act as the technical lead for multiple Agile Scrum pods (approx. 5 people per team), providing functional More ❯

contract position, paying £550 per day** We’re in search of a Full Stack Developer who has worked in an enterprise microservices environment. The Java Full Stack Developer will be based mainly at our client's London offices and will be expected to work on a hybrid model. This … Codes, tests and debugs complex applications programs Develops prototypes from functional specifications Assists users in testing, training, and preparation for deployment and operations The Java Full Stack Developer is required to possess he following skills and experience Good knowledge and experience working with Java as a primary programming … language Java – Java 8+, Springboot, Microservices, Kafka, DB React/Angular – Strong Java script knowledge is important. Python – flask Experience in a Front Office Capital Markets capacity More ❯