1 to 25 of 27 Part-Time Senior 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 More ❯

suite 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 , you will be 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 … implementing 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. 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 … 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 ❯

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 … You 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 … 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 ❯

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 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 … You 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 … 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 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 … 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 ❯

Senior Java Developer - £75k | FinTech | remote | Java, React, AWS G.Digital have exclusively partnered with a growing FinTech who are looking for a Senior Java Engineer. . 🔧 What You’ll Do: Design, develop, and maintain high-performance Java applications Collaborate with cross-functional teams to … of applications Mentor junior developers and provide technical leadership Advocate for clean, scalable, and maintainable code ✅ What you will need: 5+ years of professional Java development experience Strong understanding of Spring/Spring Boot, REST APIs, and microservices architecture Solid knowledge of relational databases (e.g., PostgreSQL, MySQL) Familiarity with … a plus Excellent problem-solving skills and a team-first mindset 💡 Bonus Points For: Experience with Python 🚀 Package up to £70k remote working bonus Senior Java Developer - £75k | FinTech | remote | Java, React, AWS 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 Engineers to join a team building high-performance 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 … 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 ❯

Role: Senior Java Software Engineer Salary: £60,000 - £80,000 - DOE Location: Ipswich (Hybrid) Type: Permanent About the job: Are you an experienced Senior Software Developer who loves variety and still loves learning new things, while connecting with new people along the way? This role could … liaising with key stakeholders within the business and estimating development timelines. I have partnered with a fantastic business who are looking to add a Senior Java focused Developer to the team. Senior Software Developer required skills: 5 year’s commercial experience minimum Strong Java background SQL More ❯

company 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 … 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 ❯

Location: UK Remote (occasional travel to HQ once per quarter) A leading SaaS organisation is looking for a Senior Java Developer to join its expanding technology team. You’ll contribute to the ongoing development of a next-generation platform, with a strong focus on high-performance search capabilities … scale data processing. This is a fantastic opportunity to work on impactful technology in a forward-thinking, data-driven environment. Your Role As a Senior Java Developer, you’ll be instrumental in building and evolving a resilient data platform that underpins key SaaS offerings. You’ll work closely … real value from complex data. Key Responsibilities Write clean, maintainable, and well-tested code following Agile and TDD practices Contribute to both backend services (Java) and modern front-end frameworks (React/TypeScript) Develop and fine-tune search functionality using technologies like Lucene, Solr, or OpenSearch Collaborate with Data More ❯

Senior Java Developer | £70k–£80k | Java, React, GCP | 100% Remote Join a thriving MedTech company that’s transforming digital healthcare across the UK and Ireland! With over 2 million patients already served through their cutting-edge online doctor services platform, this team is redefining how technology can … they’re building full-stack applications with sleek UX, robust architecture, and intelligent automation that streamlines clinical pathways and enhances patient outcomes. As a Senior Java Developer, you’ll be part of a small, agile team where your voice truly matters. Whether you prefer backend or full-stack … requirements gathering and behavior-driven development (BDD). This is a high-impact role where your work directly supports better healthcare delivery. Tech Stack: Java, Spring Boot, Microservices, React, MySQL, GCP, RabbitMQ, TDD, BDD. What we’re looking for: 3–7 years of experience in Java and Spring More ❯

Senior Java Developer 🌍 Up to £150k 💸 - Remote Working 🏡 – 6+ years experience 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 … leverage advanced technologies 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, contributing to a greener future. Key Requirements ✅ 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 understanding and practical expertise in asynchronous More ❯

Senior Java Developer 🌍 £100k–£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 … 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 … 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 More ❯

Senior Java Developer – High-Performance FX Trading We’re working on behalf of a prestigious financial services organization to source a highly skilled Senior Java Developer with a strong background in building high-performance, low-latency trading systems. This is an exciting opportunity to contribute to … and maintain high-performance FX Matching applications using Java. Apply event-driven architecture principles to create scalable and responsive systems. Conduct OS-level and Java performance tuning to meet the demands of high-frequency trading environments. Collaboration & Technical Leadership: Partner with product, architecture, and operational teams to deliver robust … for FX or similar financial trading applications. Bachelor’s degree in Computer Science, Engineering, or a related technical field. Strong expertise in low-latency Java and/or C++ development. Solid understanding of FIX and binary protocols (e.g., FIX 5.x). Advanced knowledge of multi-threading, concurrency, and performance More ❯

UK remote (willing to travel to Glasgow office once per quarter) We’re looking for a talented Senior Java Developer to join a growing tech team working on an exciting new platform. This is an opportunity to work with cutting-edge search technologies and large-scale data processing … while contributing to a product that makes a real impact. Your Role As a Senior Java Developer, you’ll play a key role in designing, building, and maintaining a robust data platform that powers our core products. You’ll collaborate with cross-functional teams to create highly performant … high-quality, well-structured code using Agile and TDD practices Develop new features across the full stack , from React/TypeScript front-end to Java-based backend services Build and optimize search solutions using technologies like Apache Lucene, Solr, or OpenSearch Design and implement data pipelines in collaboration with 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 … 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 ❯

Senior Software Engineer II – Cloud-Native & AI Solutions | Global Fintech Innovator We’re partnering with a cutting-edge global fintech company at the forefront of AI-powered decisioning and analytics to find a talented Senior Software Engineer II . This company has recently been recognized with … how financial institutions leverage data, AI, and cloud technologies to accelerate smarter decision-making. This is a high-impact role ideal for an experienced engineer who thrives on innovation and is passionate about cloud-native applications, AI/ML product development, and technical leadership within high-performing teams What … build, and operationalize large-scale AI and ML-driven applications and APIs. Lead the development of scalable, low-latency cloud-native applications, primarily using Java and AWS services. Work collaboratively with architects, cloud engineers, and product leads to shape AI/ML product requirements and roadmaps. Contribute to and More ❯

to a demanding standard that pushes us to the best we can be. Job Summary We are looking for a highly skilled and adaptable Senior Java/Flink Engineer to lead software development across our data pipeline products. You’ll be a critical member of the team … other engineers as we execute on our mission. Our platform is multi-disciplinary, and our tech stack reflects this. We utilize Python, Go and Java on the backend, and Typescript/Next.js on the front. We heavily leverage Postgres, Timescale and Redis for storage, and utilize both AWS, Azure … Ferry platform for which we augment Apache Flink and cloud IoT platforms to support this. Who you are Minimum 7+ years as a Backend Engineer Thorough understanding & experience in Java Deep & thorough understanding of Apache Flink Experience with Kafka Comprehensive knowledge and experience building, testing and deploying APIs More ❯

Senior Backend Software Engineer Up to £70,000 + 15% Bonus + Stock Options Join a fast-growing tech company that's reimagining how modern marketplaces are built. We're looking for a hands-on Senior Backend Engineer to help evolve a highly scalable platform powered … world problems. Help shape engineering practices and mentor junior developers. Collaborate with a remote-first, high-performing team across time zones. Tech Stack: Kotlin, Java (or other JVM), Spring Boot, GCP, Kubernetes, Docker, Kafka, PostgreSQL, MongoDB, CI/CD pipelines. Experience in Go, Python, or C# also welcomed. What More ❯

Senior Core Java Developer 🤖 - Up to £120k DOE 💰 - Hybrid (London) 🏡 Our client is a highly trusted player in asset management and FX trading, looking to recruit a proficient Senior/Core Java Developer to join their apps team. This opportunity will allow you to join a … offerings and the team’s workflows.⚙️ Work primarily within GCP, ensuring that the architecture is optimized for multi-cloud compatibility.🔒 Key Requirements: An experienced engineer with 7-8 years of experience.🤖 Strong knowledge and hands-on experience with Core Java. You understand which networking tools are relevant to cloud … A generous annual bonus , historically reaching up to 30%. 💰 Hybrid working pattern, with two days remote a week.🏡 If you’re a Core Java Developer looking to take your career to the next level, apply today to be considered for this excellent opportunity More ❯

Job Title : Senior Java Developer Location : London/Knutsford/Northampton Type of role : Permanent Get The Future You Want! Choosing Capgemini means choosing a company where you will be empowered to shape your career in the way you’d like, where you’ll be supported and inspired … your strong experience of TDD and automation to further increase confidence in and quality of the systems you work on. Skills Required: Experience in Java (version 8 essential, version 12 a bonus), Spring, SQL and messaging (Soap/Xml/RESTful services). Experience in test driven development and More ❯

with a well-known technology business based in Edinburgh who are looking to grow their hugely successful engineering team and are looking for a Senior Software Engineer in the Java space to work on customer facing applications and systems. There is a huge focus on innovation with … some major projects in the works. You will have experience developing highly scalable and available back-end systems & API’s using Java and Cloud based infrastructure and technologies ideally AWS. Although this is predominantly a back-end role, there will also be the option to get involved in some … operate a Hybrid model where it is usually 1 day a week onsite in their modern Edinburgh office. Experience Strong back-end experience with Java Experience with AWS as well as understanding DevOps concepts such as IaC (we use Terraform) Experience with Kafka and event streaming Experience working on More ❯

Job Title: Java Developer (Electronic Trading Platform - FIC) Contract Type: Outside IR35 Location: London Day Rate: Up to £900 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 banking client in London on a contract basis. The successful candidate will work on an Electronic Trading Platform for the FIC business . This is an exciting opportunity to contribute to the development and integration of advanced trading technologies in … . Implement market data feeds , pricing engines, and order execution systems. Optimize system performance to meet stringent latency and throughput requirements. Desired technical Skills: Java Expertise: Extensive experience with Core Java , focusing on low-level performance tuning, multithreading , and garbage collection optimization . Low Latency Development: Proven track More ❯