Principal Java Architect, London Stock Exchange
Stock exchange in the City of London
Be an early applicant
Stock exchange in the City of London
1001+ employees
Be an early applicant
1001+ employees
Company mission
To make things happen, out there in the real world, where it matters.
Role
Who you are
- Deep Java Expertise: Spring/Spring Boot, and the broader JVM ecosystem
- Architectural Mastery: Strong grasp of software architecture patterns (e.g. hexagonal, layered, microservices), DDD, and event-driven systems (Kafka, Pulsar, etc.)
- Engineering Excellence: Mastery of SOLID principles, design patterns, dependency injection, and ORMs (e.g. Hibernate, JPA)
- Tooling Fluency: Experience with Gradle/Maven, CI/CD (e.g. Jenkins, GitLab), static analysis tools (e.g. SonarQube), and test automation
- Optimisation Mindset: Good knowledge of algorithms, being able to quickly understand runtime complexity and offer alternative implementation. Good knowledge of data structures, understanding query patterns and being able to offer SQL and NoSQL solutions with appropriate scalable indexes
- Cloud-Native Thinking: Experience writing software for cloud platforms (AWS, GCP, or Azure), including containerization (Docker, Kubernetes) and observability
- Security & Resilience: Understanding of secure coding practices, fault tolerance, and system resilience in distributed environments
- Leadership & Influence: Ability to lead by example, influencing without direct authority, and communicate complex ideas clearly to technical and non-technical audiences
Desirable
- Experience with reactive programming (e.g. Project Reactor, RxJava)
- Exposure to GraphQL, gRPC, or API gateway patterns
- Experience with building agents or using Agentic frameworks such as LangChain4j, Embabel or equivalent
- Contributions to open-source projects or technical blogs
What the job involves
- Reporting to the Director of Architecture within the Risk Intelligence team
- Risk Intelligence is responsible for developing critical services that support anti-money laundering efforts in the financial markets
- We’re looking for a Principal Java Architect to lead the design, evolution, and governance of our Java-based platforms
- This is a hands-on, high-impact role where you’ll shape the future of our backend architecture, coach senior engineers, and ensure our engineering practices and tooling are world-class
- You’ll be a key influencer in our technology strategy, driving innovation while ensuring robustness, scalability, and maintainability
- Architectural Leadership: Define and evolve the architecture of our Java platforms, ensuring alignment with business goals, scalability, and long-term maintainability. Code Quality & Reviews: Perform technical reviews, enforce clean code principles (e.g. SOLID), and ensure adherence to architectural standards. Mentorship & Coaching: Guide senior engineers and technical leads, fostering a culture of engineering excellence, autonomy, and continuous learning. Event-Driven & Domain-Driven Design: Champion modern architectural paradigms such as event-driven systems, DDD, and microservices
- Tooling & Developer Experience: Own and enhance the Java development ecosystem—including build tools (Maven/Gradle), CI/CD pipelines, static analysis, and testing frameworks. Framework & Codebase Contribution: Contribute to and evolve shared libraries, frameworks, and platform components that power our services. Innovation & Research: Stay ahead of the curve on Java ecosystem developments (e.g. Project Loom, GraalVM, Kotlin, Quarkus) and lead strategic adoption. Cross-Functional Collaboration: Work closely with product, architecture, and platform teams to deliver cohesive, performant, and secure solutions
Our take
The London Stock Exchange is one of the world’s oldest stock exchanges, with a history dating back over 300 years. It operates as a part of LSEG (London Stock Exchange Group), one of the world’s leading providers of financial markets infrastructure, as a marketplace to enable stock brokers and traders to buy and sell stocks, bonds, and other securities.
The London Stock Exchange has lived through a stream of innovations; from telegraph and telephone, to the Market Price Display System, automatic trade matching, and the digitisation of issuer services. In 2019 it acquired Refinitiv, a financial information company, and in doing so became a global financial news and data business.
Most recently, the London Stock Exchange has made moves to support the evolution of private markets, and further build its presence in this space. It partnered with Floww, a platform that connects investors with private companies, with aims to launch a private primary capital raising facility, as well as explore new technologies and secondary market options for the platform.
Steph
Company Specialist at Welcome to the Jungle
Insights
21% employee growth in 12 months
Company
Company HQ
City of London, London, UK
Leadership
David Schwimmer
(CEO)Prior to joining LSEG in 2018, David was a Managing Director at Goldman Sachs for over 20 years.
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