476 to 500 of 865 Java Jobs in London

Senior Software Engineer - Java (Contract - Outside of IR35) Duration: 3 Months Plus Start Date: Beginning of August, 2025 Day Rate: £400 - 500 per day As a Senior Software Engineer (Java) - Contractor at Pulselive, you'll be focused on delivering robust, high-performance backend services and APIs that power digital experiences for millions of sports fans globally. This role is ideal … for an experienced, hands-on engineer with strong Java and Spring expertise who thrives in a collaborative and fast-paced delivery environment. You'll work closely with cross-functional teams to build, integrate, and optimize systems that handle real-time sports data, video, and live commentary. This position is project- and delivery-focused, with no line management or people-leadership … responsibilities required. Key Responsibilities: Design and develop scalable backend systems using Java and Spring Boot Deliver well-structured, maintainable, and testable code aligned with project requirements Build and maintain RESTful APIs to support web and mobile applications Integrate with third-party data providers (e.g. sports data, video, commentary) Use Git to manage code versioning and contribute to shared repositories Manage More ❯

be working as part of a best in class product and engineering team, delivering cutting edge software solutions. Our Technology Our current technology stack is outlined below: Go, Python, Java React Native, Android Apps (Kotlin) AWS PostgreSQL, SQLite Kafka, MQTT Shell scripting REST APIs Docker for both our cloud and edge-device applications Microservice-style, event-driven cloud architecture IoT … language on a daily basis during a solid stint of your professional career You should have a good understanding of development and design whilst programming in Go, Python, or Java gained in your professional working career. The level of complexity that you are able to operate within will typically be equivalent to a developer who has operated within the space … for at least 4+ years You will have an interest to learn and work with other tools and languages, such as Python and Java Your primary focus will be developing our edge-device software using Go and Python languages. Occasionally you may need to work with our cloud-side services written in Java You should be comfortable with using Linux More ❯

Nadex exchange, we list innovative capped-risk derivatives contracts on a wide range of global financial markets. What You'll Do Develop, test, and maintain high-quality, low-latency Java applications handling millions of requests per day. Collaborate with cross-functional teams to design systems that meet business and regulatory requirements. Continuously improve system performance and scalability through thoughtful design … testing, CI/CD pipelines, and performance monitoring. Document system workflows, architecture, and design decisions. Participate in peer code reviews and design discussions. Must-Have Qualifications 5+ years of Java development experience. Strong focus on concurrency , garbage collection tuning, and low-level performance optimizations. Proficient in data structures and memory-efficient design patterns. Solid experience in low-latency trading systems … Strong system design skills; capable of explaining full system workflows and identifying scalability bottlenecks. Skilled at recommending improvements to reduce latency and increase throughput. Experience with Spring Framework , and Java build tools (Gradle/Maven). Comfortable working in Linux environments and understanding of OS-level behavior. Effective communicator and a collaborative team player. Nice-to-Have Experience Cloud technologies More ❯

the impact of your work fast-our tech is built and deployed rapidly, at scale, and always with a customer-first mindset. Responsibilities Write clean, maintainable, and well-structured Java code that improves experiences for customers and colleagues Build and maintain infrastructure as code and CI/CD pipelines to deploy into cloud environments Design and implement a full range … architectural decisions and the design of scalable, resilient systems Monitor and visualise your product's behaviour in live production environments About You Requirements Minimum of 5 years' experience in Java 17+ and frameworks such as Spring, Spring Boot, and build tools like Maven Hands-on experience designing and building microservices and distributed systems Have a test-first mindset with experience More ❯

and maintaining greenfield and existing API and application services. The overwhelming majority of our systems are written in Elixir, but where necessary, we use small amounts of Python and Java where vendor SDKs require it. Designing, developing and maintaining realtime data streaming, and batch processing workloads. Providing on-call support as part of our teamwide rotation. Our on-call rotation … and communication skills. Strong attention to detail, with a track record of leading and driving projects to completion. Desirable Qualifications: More than one of: Ruby, JavaScript, Python. One of: Java, C#, C/C++. PostgreSQL, the database and the query language. Kafka/RabbitMQ or similar event-based platforms. Data structures and design/analysis of algorithms. Analysis of concurrency More ❯

Senior Agile Java Developer - Prime Brokerage Technology What We do/The Team Prime Brokerage Technology provides solutions that underpin the operations of our clients and traders that provide the foundation of our Prime Finance business. This is an area of great opportunity and is a major growth target for Citi - with technology providing the key to unlock this potential. … Role Overview/What will you do: Ownership and delivery on a variety of components (Java/Kotlin) within the Core Prime Brokerage platform. Hands-on Development. Provide technical leadership for an agile development team, championing best practices in Continuous Integration and Continuous Deployment (CI/CD). Foster a culture of quality through developer-led automated testing initiatives. Drive … root-causes and enhance performance, scalability, and reliability. Provide technical leadership and serve as advisor or coach to mid-level developers, analysts and graduates. Key Skills and Experience required Java & Test-Driven Development are essential. Extensive experience system analysis and in programming of software applications Experience in managing and implementing successful projects Subject Matter Expert (SME) in at least one More ❯

An instantly recognisable London-based financial services institution is actively seeking 2 Senior Java Developers with extensive banking experience to work on a business-critical project in the risk and pricing space. What you'll need to succeed 10+ years' Java Development experience within financial services - mandatory Good knowledge across a range of asset classes, ideally Fixed Income Strong spring More ❯

An instantly recognisable London-based financial services institution is actively seeking 2 Senior Java Developers with extensive banking experience to work on a business-critical project in the risk and pricing space. What you'll need to succeed 10+ years' Java Development experience within financial services - mandatory Good knowledge across a range of asset classes, ideally Fixed Income Strong spring More ❯

Intellectsoft is a software development company delivering innovative solutions since 2007. We operate across North America, Latin America, the Nordic region, the UK, and Europe.We specialize in industries like Fintech, Healthcare, EdTech, Construction, Hospitality, and more, partnering with startups, mid More ❯

execution algorithms, risk engines, UI dashboards, middle office reconciliation, and account infrastructure. We emphasize event-driven, deterministic system design, real-time observability, and strong security. Our tech stack includes Java (low-latency), Python, Web UI (React/Ag-Grid), Aeron, ClickHouse, Kubernetes, and modern CI/CD tooling, with a strong focus on automation, scalability, and performance. AI-assisted development … to ensure high standards across the codebase. Use AI-driven coding tools (e.g., GitHub Copilot or similar) to accelerate development and improve productivity where appropriate. Requirements 5+ years of Java backend development experience, preferably in a trading or real-time system environment. Deep understanding of Java core internals, multithreading, memory models, and garbage collection. Proven experience in GC-free or More ❯

user interface Optimise the citizen interactions Ensure compliance with data protection legislation Effective support and maintenance of the system components Essential Skills: Significant commercial experience with the following technology: Java 17+ Spring boot microservices Data modelling and SQL development, ideally PostgreSQL REST APIs AWS, AWS Lambda, S3, Typescript Modern DevOps and CI/CD practices including deployment pipelines Details More ❯

user interface * Optimise the citizen interactions * Ensure compliance with data protection legislation * Effective support and maintenance of the system components Essential Skills: Significant commercial experience with the following technology: * Java 17+ * Spring boot microservices * Data modelling and SQL development, ideally PostgreSQL * REST APIs * AWS, AWS Lambda, S3, Typescript * Modern DevOps and CI/CD practices including deployment pipelines Details More ❯

and we care more about aptitude and attitude than specific experience or qualifications. We are very open about how we deliver software. For the most part we code in Java, but you need not be an expert when you join us! We believe in clean coding, simple solutions, automated testing and continuous deployment. If you care enough to find elegant … 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 releasing More ❯

ROLES AND RESPONSIBILITIES Real-time Derived Data and Analytics Work closely with portfolio managers and Quants to expand our derived data and analytics universe. Contribute to complex low latency Java codebase. Understand Quant library interface and work with Quants to validate deliverables. API Development for Analytics and Data: Work closely with portfolio managers and quant devs to develop and maintain More ❯

access to capital and liquidity. What We do/The Team The FX Data Analytics & AI Technology team, within Citi's FX Technology organization, seeks a highly motivated Senior Java Data Engineer. The FX Data Analytics & Gen AI Technology team provides data, analytics, and tools to Citi FX sales and trading globally and is responsible for defining and executing the … a practical and pragmatic attitude, ability to build consensus, and work both collaboratively and independently in a dynamic environment. Role Overview/What will you do: As a Senior Java Engineer, your mission is to help shape our team of innovators and technologists toward creating next-level solutions that improve the way our business is run. Engineer data and analytics … or equivalent education) in a STEM discipline. Proven experience in software engineering and development, and a strong understanding of computer systems and how they operate. Hands on Experience in Java , Spark , Scala ( or Java) Production scale hands-on Experience to write Data pipelines using Spark/any other distributed real time/batch processing. Strong skill set in SQL/ More ❯

Technical Lead (Java/Python) London £90,000 - £95,000 + Progression + Pension An excellent opportunity awaits an experienced Developer with strong Python and Java experience join an exciting SaaS business. This role offers technical growth, variety, and strong development opportunities. The company is a profitable, maturing technology business delivering software and AI-driven solutions for industrial sectors. In … while working closely with the Software Engineering Manager. This role is fully office-based in London. The ideal candidate is a hands-on Software Engineer with strong experience in Java and Python, confident working with AWS cloud infrastructure including containerisation (Docker/Kubernetes), architecture, and scaling systems. They will have solid skills in building and managing data ingestion and processing … management, and reliability *Mentor and guide the development team while working closely with management *Fully office-based role in London The Person: *Experienced Hands-on Software Developer with strong Java and Python experience *Strong AWS cloud infrastructure and containerisation (Docker/Kubernetes) *Skilled in building and managing data ingestion and processing pipelines (Kafka/Spring Batch) *Looking to lead a More ❯

Technical Lead (Java/Python) London £90,000 - £95,000 + Progression + Pension An excellent opportunity awaits an experienced Developer with strong Python and Java experience join an exciting SaaS business. This role offers technical growth, variety, and strong development opportunities. The company is a profitable, maturing technology business delivering software and AI-driven solutions for industrial sectors. In … while working closely with the Software Engineering Manager. This role is fully office-based in London. The ideal candidate is a hands-on Software Engineer with strong experience in Java and Python, confident working with AWS cloud infrastructure including containerisation (Docker/Kubernetes), architecture, and scaling systems. They will have solid skills in building and managing data ingestion and processing … management, and reliability*Mentor and guide the development team while working closely with management*Fully office-based role in London The Person: *Experienced Hands-on Software Developer with strong Java and Python experience*Strong AWS cloud infrastructure and containerisation (Docker/Kubernetes)*Skilled in building and managing data ingestion and processing pipelines (Kafka/Spring Batch)*Looking to lead a More ❯

Senior Full Stack Java Developer (100k-120k plus benefits and bonus) This is a hybrid role, 2 days in the office, 3 days remote What the role offers: Competitive salary with growth opportunities. Opportunity to work on cutting-edge fintech solutions. A collaborative and supportive team environment. Exposure to a wide range of technologies and the chance to shape the … As we expand, we're looking for a talented developer to join our team and play a crucial role in shaping our platform. Role Overview: As a Full Stack Java Developer, you will work across the full stack, collaboratively contributing to front-end, back-end, system architecture, and infrastructure. You will be responsible for designing and developing scalable, robust software … solutions using Java, with a focus on system design and performance. AWS experience is a plus, and financial industry knowledge would be beneficial but not required. Key Responsibilities: Work on full-stack development, including front-end, back-end, and infrastructure. Collaborate closely with a small, highly skilled team to deliver innovative solutions. Optimize system performance, troubleshoot issues, and continuously improve More ❯

a motivated Blockchain Developer passionate about cutting-edge technology and earning potential. This role is fully remote and involves working with technologies such as Blockchain, Ethereum, Tokens, Coins, C++, Java, Node.js, Go, Python, dYdX, Kyber, 0x, and MakerDAO. Role Description The position offers a salary of £130,000 and is with a high-profile client, a global Prop Trading firm More ❯

years experience of working with Adobe Livecycle coupled with Oracle and PL/SQL. Responsibilities Development dynamic PDF forms using XML and JavaScript Development of process workflows using configurable JAVA components Maintenance and Support for existing workflows and forms Enhancements User training and end-user support Additional Skills Programming courses, knowledge of XML and Xpath, HTML and CSS, Web Services More ❯

all areas of the development lifecycle. Provide regular status updates, reflecting individual progress against the development plan. Customize and extend Endur funcitionality using OpenJVS, OpenComponents, AVS, Connex, C#, .Net, Java, and SQL. Ability to work with a highly customised Endur installation, including reverse engineering documentation Support project delivery More ❯

of experience in quantitative analytics or data modeling Deep understanding of predictive modeling, machine-learning, clustering and classification techniques, and algorithms Fluency in a programming language (Python, C,C++, Java, SQL) Familiarity with Big Data frameworks and visualization tools (Cassandra, Hadoop, Spark, Tableau More ❯

of experience in quantitative analytics or data modeling Deep understanding of predictive modeling, machine-learning, clustering and classification techniques, and algorithms Fluency in a programming language (Python, C,C++, Java, SQL) Familiarity with Big Data frameworks and visualization tools (Cassandra, Hadoop, Spark, Tableau More ❯

of experience in quantitative analytics or data modeling Deep understanding of predictive modeling, machine-learning, clustering and classification techniques, and algorithms Fluency in a programming language (Python, C,C++, Java, SQL) Familiarity with Big Data frameworks and visualization tools (Cassandra, Hadoop, Spark, Tableau More ❯

of experience in quantitative analytics or data modeling Deep understanding of predictive modeling, machine-learning, clustering and classification techniques, and algorithms Fluency in a programming language (Python, C,C++, Java, SQL) Familiarity with Big Data frameworks and visualization tools (Cassandra, Hadoop, Spark, Tableau More ❯