1 to 25 of 29 Part-Time Java Developer Jobs in the City of London

Low latency Java Developer - Algo Trading Up to £160,000 p/a Leading London-based trading firm has an outstanding opportunity for a Java Developer to join their low latency trading team. Our client quant prop trading house with performance figures of 22%. They … are currently looking to expand their high and intraday trading presence across FX, equities and commodities. The Java Developer will: Work closely with the Head of Trading and the Quant Team and assist in design and development of new trading algorithms, mainly in Java Help engineer a … are made efficiently; changes are implemented quickly. It’s a friendly, open place where people are motivated because they enjoy what they’re doing. Java Developers MUST have: Computer Science or Machine learning BSc or Masters or PhD from a top 40 University Globally Some commercial Java Development More ❯

The right to work in the UK without sponsorship is essential for this vacancy. An exciting opportunity for a Java Developer has arisen with a leading cyber security innovator developing cutting-edge cyber security testing solutions, based in London. This is a great opportunity for a Java Developer to join a fast-growing, mission-driven team and help shape the future of automated cyber security testing tools. You’ll work hands-on with Java, collaborating across disciplines to build innovative solutions with autonomy and immediate impact. You will commit to a hybrid working model … required onsite 3 days a week. Experience of the Java Developer includes: 1+ year with Java development and object-oriented design Test-driven development, including experience with TDD, JUnit, and user testing Use of GIT VCS Creation of detailed design documentation If you are a Java More ❯

Lead Java Developer – FX/Trading! Salary: £120,000 - £130,000 + bonus (previously 25-40%) + benefits Location: 3 days onsite, City of London Do you enjoy writing Java code day-to-day as well as line-managing your own team? Do you have a few … work on cutting-edge trading solutions! This highly respected financial institution is expanding its London office and is on the lookout for a Lead Java Developer to guide one of the teams working on an App in the Cloud product. As the Lead Java Developer, you … will:Be a hands-on leader and write Java code, pair-program with your team and carry out code reviewsLine manage a team of approximately 4-5 Engineers, helping them grow in their careers and developmentContribute and discuss with different stakeholder in the business, notably the Product and Design More ❯

Principal Java Developer – Major Financial Institution London/Hybrid | Contract | £700-£800 inside IR35 (gross umbrella rate) We’re working with a major financial institution looking to scale out its engineering function with a Principal Java Developer to lead critical systems work. This is a hands … design, and steering collaborative technical decisions across squads. What they’re looking for: Proven experience supporting large-scale, business-critical systems Strong background in Java and ideally C# Some front end exposure (Angular ideally but other frameworks considered). Note the role is back end focused. Comfortable working with … implementation Bonus points for: Angular, React or frontend exposure Familiarity with Snowflake or backend SQL variants This is a great opportunity for an experienced Java Developer to join a prestigious financial player. If you’re someone who thrives in complex environments and enjoys technical leadership alongside delivery, apply More ❯

A leading corporate banking and capital markets organisation is seeking a Java Developer to join their team in London. Company Description: Commerzbank is a leading international commercial bank with branches and offices in almost 50 countries. The world is changing, becoming digital, and so are we. We are … execution, hedging and market making, together with the ability to customise solutions to clients’ needs. Job Purpose: The pricing team is looking for a developer with lots of potential and a strong numerate background to help build the next generation Interest Rate pricer. This involves building bespoke pricing platforms … with the C++ quant pricing libraries as well as the distribution of market data to back office systems and internal/external clients. Summary Java development role (Java 21+). The business is ever-changing and demands an agile culture, fast-paced front office environment. The role is More ❯

Role: Application Developer Tech stack: Java, TypeScript, Endur Industry: Energy trading Day Rate: £500-600/d inside IR35 Location: London (hybrid) Contract: 6 months (strong extension potential) X4 Technology are partnered with a global energy trading company looking for a skilled Application Developer to join their … environment, contributing to the development and integration of solutions that support renewable energy trading, financial analytics, and risk management. Responsibilities of the Contract Application Developer (Java, Typescript, Endur) Develop, enhance and maintain applications using Java and TypeScript . Customise and support Endur (Openlink), including JVS and AVS … Participate in code reviews, design sessions, and continuous improvement initiatives. Ensure software quality through unit testing, automation, and documentation. Requirements of the Contract Application Developer (Java, Typescript, Endur): Proven experience in Java development (Spring Boot, REST APIs). Solid front-end experience with TypeScript and modern frameworks More ❯

Senior Java Developer Global Tech Giant Up to £115k 2-3x a week in Shoreditch Are you a Senior Java Developer eager to lead the charge in innovation for one of Silicon Valley’s largest tech giants? This is a rare opportunity to join a … Senior Developers to lead new squads focused on greenfield projects. They have a strong engineering culture in the London office, and as their Senior Developer, you’ll work with Java (17+), SpringBoot, Kotlin and NoSQL databases . They’ve got their own internal cloud and toolings using Prometheus … and Grafana. As their Senior Developer, you’ll be: A key advocate for best coding practice, standards, and innovation. TDD approach is key for this as you’ll be owning the end to end development of the platform Experienced in mentoring and also hands on support of your team. More ❯

Location: London EC2 (Office-based, 5 days pw - Monday to Friday) Salary: £70,000 – £80,000 + bonus Type: Full-time, Permanent Backend Java Developer Overview A leading FCA-regulated financial technology firm is seeking an experienced Backend Java Developer to join its growing team. This … leadership role as the team expands. Key Responsibilities Design, develop, and maintain scalable and secure trading applications Write clean, testable, and maintainable code using Java and Spring Boot Build and integrate RESTful APIs and third-party services Participate in code reviews and Agile development processes Troubleshoot production issues and … processes where applicable Key Requirements Bachelor's degree in Computer Science, Information Systems, or a related field 5–8 years of professional experience in Java development Strong expertise with Spring and Spring Boot frameworks Proficiency in SQL (PostgreSQL preferred) and ORM technologies (e.g., Hibernate) Experience with REST API development More ❯

Job Title: Core Java Developer – Ultra Low Latency Trading Systems Location: London Type: Permanent Overview: We are hiring a Core Java developer to join a high-performance trading team focused on eFX OR Crypto markets. This role requires deep technical expertise in ultra-low latency systems … Contribute to architecture and design decisions for latency-sensitive services Ensure code quality through rigorous testing, benchmarking, and profiling Required Skills & Experience: Strong Core Java expertise (JVM internals, multithreading, low-level concurrency) Demonstrable experience building systems with microsecond SLAs Prior experience in eFX or crypto trading platforms , particularly pricing More ❯

Role: Backend Java Spring Boot Developer Contract Duration: 12 months Work Arrangement: Hybrid - Croydon (Biweekly on-site presence) IR35 Determination: Inside Sector: Government/Public Services Interview Format: Single-stage via Microsoft Teams Security Clearance: SC/NPPV3 REQUIRED We are seeking a skilled Java Developer … as required. -Update API documentation to reflect new or modified functionality. -Present completed work for stakeholder review and approval during sprint reviews. Essential Skills -Java/Spring Boot Microservices -AWS Kubernetes -Hibernate -Debezium -Messaging systems (eg, SNS/SQS) -AWS RDS/Aurora PostgreSQL -AWS OpenSearch -Jenkins/Git More ❯

Senior Java Analyst Developer/Technical Consultant £600 p/d Outside IR35 Quant Capital is urgently looking for a Java Analyst Developer/Technical Consultant to join our high profile client. Our client is a global trading platform software business. Its products are used globally … functionality, and undertaking development to deliver functionalities (when required). Technical Consultants/Analyst Developers must have: 8+ years’ full-stack experience as Senior Developer around digital applications, software engineering, microservices and cloud. This could include Core Java, Spring Boot, Hibernate/JPA and UI using React, Ember More ❯

Java Developer Role Type: Permanent Position Office Location: Central London Hybrid Model: 3 days per week in office, 2 days remote The Role Join a dynamic cross-functional team where you'll be involved building cutting-edge software systems that power real-time financial markets. As a talented … Java Engineer, you'll help shape the technology stack that drives millions of dollars in trading volume. Key Responsibilities Design & Build : Create robust, high-performance software systems and applications for financial operations Technical Leadership : Drive architecture decisions, set coding standards, and choose platforms and tools Collaborate : Work closely with … paced financial markets Innovate : Stay ahead of the curve with modern development practices and emerging technologies Essential Skills Technical Expertise: 2 to 3 years Java development - enterprise-level experience required C++ knowledge or strong motivation to master high-performance languages Kafka/Confluent - real-time data streaming experience Agile More ❯

About the Role: We are seeking an experienced and visionary Technical Lead with deep expertise in Java Springboot, microservices architecture, and solution design to lead the backend engineering efforts of our enterprise platforms. You’ll work closely with engineering managers, architects, mobile teams, and product stakeholders to deliver scalable … secure, and maintainable solutions. Job Description: Java Lead engineer will play a critical role in the design, development, and implementation of mission - critical applications and systems. They leverage their extensive technical expertise and leadership skills to lead complex projects, mentor junior team members and drive innovation across the organization. … someone who has clear basic fundamentals. CI/CD - Docker or Kubernetes concepts. Reactive Programming experience. Common Logging experience. Top Skills/Must Have: Java Development (Java 21/Java 17/Java 8). Micro-services Architecture - Spring/Springboot. Cloud - Azure is good to More ❯

CyTAL is a leading cyber security company and is growing the development team for our cutting-edge suite of cyber-security tools. As a Java Developer in our multidisciplinary development team, you will be hands on with Java coding and driving forward the development of our cyber … and innovation within the development team - Work closely with other team members to troubleshoot and resolve technical challenges Essential Experience: - Demonstrable proficiency in developing Java and related technologies - Testing: Test Driven Development, J-Unit, User testing - Use of GIT VCS - Object-oriented design - Creation of detailed design documentation Desirable More ❯

Are you a Java Developer with a couple of years experience, looking to level up your career in a meaningful way? Join a dynamic team building innovative software tools that support critical business operations. This hands-on role involves writing clean, well-tested code, collaborating with experienced developers … and contributing to real-world projects from day one. What You’ll Do Develop and maintain Java-based applications Write clean, maintainable code using Test-Driven Development and modern best practices Troubleshoot and solve technical challenges alongside your team Learn and apply new concepts in a practical environment What … We’re Looking For 2+ years of professional Java development experience Strong knowledge of object-oriented programming and version control (Git) Experience with automated testing frameworks (JUnit, TDD) Good documentation and communication skills Enthusiasm for learning and professional growth Bachelor’s degree in Computer Science or related field If More ❯

Senior Java Developer – Market Connectivity – Equities (Contract) Location: London (Hybrid) A leading investment bank is seeking a senior Java engineer to join its Equities Connectivity team on a contract basis. This is a key role supporting a critical platform that connects to external trading venues and market … high-performance messaging Contribute to ongoing platform upgrades and modernisation Help shape the long-term strategy of the connectivity stack Key Requirements: Strong Core Java, multithreading, and concurrency experience Knowledge of market connectivity protocols (e.g. FIX) Experience in any asset class, equities preferred, but others considered Ability to work More ❯

A leading Investment Banking in the city are recruiting for a Java Developer at Associate Director level to join the front office Algo trading multi-asset team. Within the role you will facilitate the build out of an enterprise wide cross-asset multi-strategy Algorithmic trading framework. You … role requires you to identify and implement solutions to optimise performance and maintain low latency It is essential that you have previous front office Java Dev experience and come from a strong academic background. In return they are offering an excellent remuneration package, further career progression opportunities and a More ❯

Senior Java Analyst Developer/Technical Consultant £120,000 Plus Bens Quant Capital is urgently looking for a Java Analyst Developer/Technical Consultant to join our high profile client. Our client is a global trading platform software business. Its products are used globally by most … functionality, and undertaking development to deliver functionalities (when required). Technical Consultants/Analyst Developers must have: 8+ years’ full-stack experience as Senior Developer around digital applications, software engineering, microservices and cloud. This could include Core Java, Spring Boot, Hibernate/JPA and UI using React, Ember More ❯

a permanent basis working with their Central Government clients. In order to be successful, you will have the following experience Highly experienced back end developer, with experience in working on Government or Defence applications (DV Cleared) Experienced developer within Java, TypeScript, JavaScript and/or Python Build More ❯

Paragon Alpha are partnered with a well-established Financial Services Firm who are hiring a Senior Java Developer to lead the buildout of a greenfield execution platform for their Equities desk in London. You will be central to the planning and development of this new build. Using your … experience in Equities trading, being able to efficiently and effectively go face to face with professionals on the trading floor. Deploying your proficiency in Java for full-stack trading system development. Tech Stack: Java, Kubernetes, SQL This is an opportunity to take on a leading role on my More ❯

of home and office, subject to operational requirements. As part of the Global Equities Front Office technology team, an opportunity exists for an experienced developer to work on a real-time trade processing and client allocation platform. The platform is primarily built in Java and incorporates low-latency … memory database technologies. The role involves a mix of technical support tasks, including diagnosing production issues, applying bug fixes, and extending the platform using Java and a proprietary workflow/reporting framework. There are also opportunities to collaborate globally to enhance the core framework and develop new features. Candidates … complex equities trading workflows and familiarity with Fidessa ETP and/or CTAC is desirable. Key Responsibilities & Tasks: Develop new workflows using a proprietary Java-based framework Develop new reports using the same framework Collaborate with the global development team to enhance the platform Implement permanent fixes for development 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 development … 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 ❯

Our client, a leading global investment bank, is looking to hire an experienced Quantitative Developer to join their front-office Equities Electronic Trading team. This is a high-impact, hands-on development role focused on building and optimizing low-latency trading algorithms and infrastructure. The position is based in … firm remains competitive in modern electronic markets by integrating quantitative techniques and high-performance engineering. Role Responsibilities Design and implement proprietary trading algorithms in Java Develop and enhance the firm’s smart order router and market analytics systems Ensure code is well-documented, performant, and production-ready Review peer … level discussions to improve model design Candidate Requirements Minimum 5 years of experience in front-office electronic trading development Strong hands-on experience with Java in low-latency, high-performance environments Background in cash equities or similar fast-paced asset classes Experience with algorithmic trading systems or smart order More ❯

touch with at UKI.recruitment@tcs.com or call TCS London Office number 02031552100 with the subject line: “Application Support Request”. Role: AWS Full Stack Developer Job Type: Permanent Location: London, UK/Hybrid Number of hours: 40 hours per week – full time Ready to utilize your experience and expertise … learning opportunities. Work closely with the range of teams within the business to bring products to life. The Role As an AWS full stack developer, you will be responsible for design and development of web applications using Java and AWS Serverless Architecture Model (Lambda, DynamoDB, ECS Fargate, SQS … CloudWatch, CloudFormation, IAM, CodeBuild, Security Groups, API Gateway, ALBs, KMS, Secrets Manager, Parameter Store, S3). Key responsibilities: Design and develop web applications using Java and AWS technologies. Integrate and manage AWS services like EC2, S3, Lambda, and RDS. Develop code deployment strategy and pipelines. Write clean, maintainable, and More ❯

Quant Developer – Front Office | Top Investment Bank | London We’re hiring a Quantitative Developer to join a leading investment bank’s front-office trading team in London. What You’ll Do: Build scalable frameworks for smart order routing & execution strategies Design & implement equities trading algorithms Collaborate with traders … quants, and engineers Work in a low-latency, high-performance environment What We’re Looking For: 5+ years in front-office trading tech Strong Java (low-latency systems); kdb+/q or C++ a plus Experience with electronic cash equities/algo trading Degree in CS, Financial Engineering, or More ❯