1 to 25 of 302 Java Jobs in the City of London

Senior Java Developer - Java, Kotlin, Concurrency, Kafka, RDBMS, Unix, Linux, Front Office, Multi-threading Role Overview: I am seeking a Senior Java Developer to join a leading Investment Bank as part of their global front-office technology team. This is a hands-on position focused on working with a real-time, event-driven system that underpins our industry-leading platform. … components, ensuring the platform can scale to meet the growing demands of business event processing and data management. Key Responsibilities: Develop, implement, and maintain highly performant, secure, and scalable Java applications. Java Server Side Concurrent Programming with Spring Boot (Core Spring) Leverage Kafka or other message queue systems to handle asynchronous processing. Design, optimize, and maintain MongoDB (NoSQL) database schemas. … JUnit and other relevant frameworks. Take full ownership of feature development from design through to production deployment. Collaborate effectively with cross-functional teams, balancing independence and teamwork. Key Skills: Java Kotlin Concurrency Message-driven architectures - Kafka, MQ SQL Queries Unix/Linux scripting Multithreading This is a full time role offering a salary of up to £130k. You will be More ❯

Job Title: Java Developer Location: London (Hybrid – 3 days in office per week) Salary: Up to £80,000 per annum About the Company: Join a leading travel company renowned for delivering exceptional customer experiences and innovative digital solutions. As part of a forward-thinking technology team, you’ll contribute to shaping the future of travel by building scalable, high-performance … applications used by millions of customers worldwide. The Role: We are looking for a skilled Java Developer to join our London-based technology team. You will work on designing, developing, and maintaining enterprise-level applications that support our digital platforms and customer-facing services. Key Responsibilities: Design, develop, and maintain high-quality Java applications and microservices. Collaborate with cross-functional … Ensure code quality through unit testing, code reviews, and adherence to best practices. Troubleshoot, debug, and optimize applications for performance and scalability. Stay up-to-date with the latest Java technologies and industry trends. Required Skills & Experience: Strong experience in Java (Java 8+) development. Solid understanding of object-oriented programming and design patterns. Experience with Spring Framework (Spring Boot, Spring More ❯

Java Engineer We’re working with a leading brokerage seeking a talented Java Engineer to join their high-performing technology team. This is an exciting opportunity to work on high-throughput, low-latency trading systems, where performance and reliability are paramount. The Role: You’ll play a key role in designing, developing, and optimising core trading and risk systems. The … ideal candidate will have a strong understanding of multithreaded Java applications, coupled with an appreciation for scalability, data integrity, and system performance. Tech Stack & Skills: Strong core Java (Java 8+), with proven experience in multithreading and concurrency Solid understanding of data structures, algorithms, and object-oriented design Experience in low-latency or high-performance systems (finance or similar domains a … with messaging frameworks (e.g. Kafka, JMS, ZeroMQ) desirable What’s on Offer: Salary £120k-£130k + bonus Hybrid working model (3 days onsite in London) If you’re a Java Engineer who loves building high-performance systems and wants to make an impact in a fast-moving financial environment, we’d love to hear from you. More ❯

Senior Java Developer - Java, Springboot & AWS – paying up to £650/day (Inside IR35) – Hybrid (2x a week - London) – 6 month contract Our client is seeking a Senior Java Developer who is passionate about clean code, cloud-native systems, and building technology that makes a real impact. This is a unique opportunity to work in an agile, high-ownership engineering … culture. What You'll Be Doing: Build and scale backend services using Java and Spring Boot Shape a modern microservices architecture for a high-availability platform Deploy and manage services in AWS with Kubernetes (EKS) Design, implement, and own features end-to-end from discovery to production support Advocate for clean code, automated testing, and CI/CD best practices … with cross-functional teams including product, design, and infrastructure Troubleshoot complex issues and help ensure system reliability and performance What You’ll Bring: Strong backend engineering experience, especially in Java and Spring Deep understanding of distributed systems and microservices Hands-on experience with AWS , Kubernetes , Docker , and Terraform Familiarity with CI/CD pipelines and testing best practices Solid SQL More ❯

Java Software Engineer - Java, Python, AWS, MySQL, NoSql, REST APIs, Microservices, Machine Learning, Artificial intelligence (Hybrid - 3 days a week in the office - Notting Hill) Description for the Java Software Engineer role:- You will be joining a fast-growing, research-driven company building an artificial intelligence using novel machine learning techniques. My client is revolutionising their industry with a track … record of building things that others have ruled out as impossible. The Java Software engineer will join a very bright, talented team of engineers with the guidance of technologists who have help build up some of the best known technology companies today. You will have a great opportunity to work with a variety of languages, frameworks and tools. Applicants will … need a background in Java and/or Python with a focus on Server side technologies. Core skills for the Java Software Engineer: 5yrs in a commercial Development role Solid experience of Java Good knowledge of Cloud Technologies (AWS) and Microservices Strong database knowledge (SQL and NoSQL) Degree in Computer Science, Engineering, or a related field, or equivalent hands-on More ❯

product and architecture. What We’re Looking For 5+ years’ software engineering experience, ideally within a SaaS, fintech, or payments environment. Strong object-oriented programming background — any OOP language (Java, C++, Python, etc.) as long as you’re comfortable working with .NET/C# . Solid full-stack capability, including experience with modern JavaScript frameworks (React preferred). Strong understanding More ❯

dispersed engineering teams (20-30+ heads) in global banks. Experience with Microsoft-based legacy systems (.NET, C#, SQL, Azure, on-prem/cloud) and emerging technologies including Linux, Java, microservices, and containerisation (Docker, Kubernetes, Helm, Camunda). Proficiency in CI/CD pipelines (Jenkins), version control (GitHub/GitLab/BitBucket), backend/frontend frameworks (Spring Boot, Angular, React More ❯

layer. Ensure compliance with security policies and participate in audits and vulnerability remediation. Maintain accurate documentation, including topology diagrams, runbooks, and configuration baselines. Support proprietary messaging APIs using C++, Java, Python, and C# programming languages. Provide support for proprietary cache and gateways that integrate applications with the messaging service. Required Skills & Qualifications: 3+ years of experience administering Solace PubSub+ messaging More ❯

What we’re looking for... Essential skills and experience: 5+ years experience of developing complex applications using an OO language (ideally Python, but experience in C++/C#/Java/etc would also be considered) Experience working on mission-critical applications, following a robust SDLC Excellent communication and problem-solving skills; and a strong aptitude for learning Experience and More ❯

and resolve production issues, ensuring minimal disruption to trading activities. Contribute to continuous improvement initiatives and technical innovation within the team. Key Skills & Experience: Required: Strong programming skills in Java , C# , or Python . Experience with FX trading systems , ideally in investment banking or financial services. Solid understanding of trade lifecycle , pricing , and risk management . Familiarity with FIX protocol More ❯

infrastructure-as-code: Terraform Experience with GKE, Helm, and Harness Experience with Linux System Administration Understanding of high-availability, disaster-recovery, monitoring and logging at scale Deep hands-on Java (plus Spring framework). Nice to have: Python and Node.js Skills and Experience Consulting experience, preferably with major IT consulting Docker (DCA) or Kubernetes (CKAD) certification a plus Highly articulate More ❯

Expertise in CI/CD pipelines, infrastructure-as-code, and cloud-native development Solid knowledge of modern development frameworks and tools Our Tech Stack includes: Languages: JavaScript/TypeScript, Java, C# Frameworks: Vue, Angular, React, Node, Next, Spring/Spring Boot, .NET/ASP.NET Cloud Platforms: AWS, GCP, Azure CI/CD: Jenkins, GitHub Actions, Azure DevOps IaC: Terraform, CloudFormation More ❯

engineers, architects, and DevOps teams to deliver robust streaming solutions. Required: • Hands-on experience with Apache Kafka (any distribution: open-source, Confluent, Cloudera, AWS MSK, etc.) • Strong proficiency in Java, Python, or Scala • Solid understanding of event-driven architecture and data streaming patterns • Experience deploying Kafka on cloud platforms such as AWS, GCP, or Azure • Familiarity with Docker, Kubernetes, and More ❯

incident. What You’ll Do Lead end-to-end development and deployment of mission-critical backend systems, targeting 99.999% availability. Architect and deliver high-throughput, cloud-native services using Java/Spring Boot , Node.js , and Python across AWS and Kubernetes environments. Implement event-driven architectures using Kafka, RabbitMQ, and AWS services (SNS, SQS, Lambda, DynamoDB). Drive automation across CI More ❯

Senior Automation Test Engineer (Selenium Java & Python) London, UK (Hybrid work model) We are seeking a highly skilled and proactive Senior Quality Analyst with strong expertise in web and mobile application testing, automation frameworks, and API testing. The ideal candidate will have hands-on experience with Selenium (Python), Postman, SQL, and a solid understanding of quality assurance best practices. Exposure More ❯

a genuine technologist’s role — building critical software that combines engineering precision, scalability, and innovation. What We’re Looking For Very strong expertise in one of C#, Python or Java , ideally with working knowledge of another. Rust very desirable Proven experience designing and developing complex, distributed, real-time systems . Deep understanding of software architecture, concurrency, performance optimisation , and system More ❯

Azure AI Services, Azure OpenAI, AI Search, Data Lake Storage, Data Factory, Databricks, HDInsight, Azure Synapse Analytics, Azure SQL Database, Functions, and Azure DevOps. Strong programming skills in Python, Java, Scala, R, or .NET/C# . Proficiency in SQL and database design . Solid understanding of data models, data mining, analytics, and segmentation techniques . Experience with ETL pipelines More ❯

Senior Java Developer- London/Hybrid- up to £95k Our client an innovative and light footed fintech startup/scaleup brand are on a mission to revolutionise the credit and lending space. The brand who have now been running for the last 10 years and backed by VC investment are looking to hire a Senior Engineer to work on an … for people that are willing to come to their office 3 days per week, they may have a bit of flexibility on this and very flexible hours. Tech Stack: Java 11 (moving to Java 17) Relational Databases- SQL and ORM Tech (JPA, Hibernate) Frameworks- preferably Vaadin or JSF, Wicket, Spring MVC Spring Boot AWS Microservices ML/Big Data- desirable … ups, sprint panning, retrospectives and foster collaboration mentor more junior engineers collaborate with cross functional teams champion best practice Projects: migration from some monolithic architecture to microservices migration from java 11 to java 17 migration to new versions of Vaadin brand new lender platform and payment systems for their customers Building a white label solution or managed service offering Cultural More ❯

Azure experience is also very relevant. Proven track record building CI/CD pipelines and infrastructure-as-code. Experience developing and supporting production-grade applications in languages such as Java, Python or C#. Technical leadership in a specialist domain (e.g., containers, data platforms, cloud networking). Experience working in regulated environments with a focus on security and compliance. Desirable Experience More ❯

Why Join FDM’s Graduate Programme? Up to 12 weeks of hands-on training in our Skills Lab with expert coaches Learn practical skills such as Object-Oriented Programming, Java, Springboot, React, Python, JavaScript, Git, SQL, cloud platforms, and CI/CD pipelines and AI integrations Make an impact and work on real projects with top global brand Get ongoing More ❯

Markets applications, including Cash Equities Experienced with Playwright or other testing tools such as Selenium Strong knowledge of HTML, CSS, JavaScript/Typescript, ideally with some Python, .NET and Java Some knowledge of React Strong analytical skills combined with a structured methodical and hands-on approach with passionate attention to detail Demonstrate good judgement in solving problems as well as More ❯

and Confluent components • Experience with Confluent Cloud, Stream Governance, Data Lineage, and RBAC • Expertise in stream processing (Apache Flink, Kafka Streams, ksqlDB) and event-driven architecture • Strong proficiency in Java, Python, or Scala • Proven ability to integrate Kafka with enterprise systems (databases, APIs, microservices) • Hands-on experience with cloud platforms (AWS, GCP, Azure) and Kubernetes • Familiarity with CI/CD More ❯

delivery roles Data architecture and solution design experience Hands-on experience with modern data tools such as dbt, Fivetran, Matillion, or similar data integration platforms Programming skills in Python, Java, or Scala Relevant cloud certifications (SnowPro, Databricks Certified, AWS/Azure/GCP Data Engineering certifications) Experience with DataOps, CI/CD practices, and infrastructure-as-code Knowledge of data More ❯

or large data streaming in browsers. Contribution to design systems, accessibility audits, and automated localisation workflows. Fluency in adjacent languages used across Motilent products (e.g. Python 3, modern C++, Java, Terraform) for pipeline or tooling integration. Experience applying advanced mathematics, geometry, optimisation, or algorithm design to imaging problems. Experience with cloud infrastructure solutions such as AWS, Microsoft Azure, and Google More ❯

eFX Software Engineer - Permanent Location: London, United Kingdom Remote First working model - Minimum 2 Days a month in office Salary: Highly competitive Market Rate on offer - DoE Paritas is working with a Tier-1 Financial institution who are looking to More ❯