Java/Spring AI Technical Architect

About Us:

LSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. It’s how we’ve contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services – and our open-access model – we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity.

LSEG is headquartered in the United Kingdom, with significant operations in 70 countries across EMEA, North America, Latin America and Asia Pacific. We employ 25,000 people globally, more than half located in Asia Pacific.

Proud to share LSEG in Romania is Great Place to Work certified (Sept ’24 – Sept ’25). Learn more about life and purpose of our company directly from the Romanian colleagues’ video: Bucharest, Romania | Where We Work | LSEG

Role Description:

Senior hands-on architect for Capital Markets Shared Technology, combining Java architecture, AI-enabled engineering, and technical leadership to drive better systems and faster delivery.

The AI-focused Technical Architect is a senior engineering leader responsible for designing modern, modular, AI‑optimised software systems and guiding engineering teams across the full solution lifecycle. The role combines deep hands-on engineering experience with architectural vision, ensuring that solutions are scalable, resilient, observable, LLM‑compatible, and aligned with modern SDLC and AI‑era development standards.

You will drive decisions around system decomposition, modularity, interoperability, and domain boundaries, introducing patterns such as Spring Modulith, jMolecule DDD abstractions, event architecture, and AI‑assisted SDLC workflows (agents, MCP servers, spec‑driven development). You will ensure project structures, documentation, automation, and governance frameworks are optimised for modern LLM‑driven development teams.

Your goal is to deliver high‑quality, maintainable, future‑proof enterprise systems and accelerate delivery through AI‑native engineering practices.
This role requires significant experience as a software developer.
The goal is to provide a framework for the development of a software or system that will result in high quality IT solutions.

• You will build a strong understanding of Capital Markets business processes and use that context to shape architecture decisions.
• You will mentor and upskill engineers, making complex topics clear and practical for junior developers.
• Operate with high autonomy and entrepreneurial drive, spotting opportunities and leading improvement initiatives.
• Champion adoption of modern technologies, engineering standards, and AI-enabled practices across the broader Capital Markets group.
• Challenge the status quo constructively, balancing innovation with security, resilience, auditability, and risk control.
• Invest in personal growth, actively develop others, and remove barriers to cross-team and global collaboration.
• Share expertise through architecture forums, workshops, brown-bag sessions, and other internal knowledge-sharing channels.

• Expert Java and Spring Boot skills, with strong experience building modular, testable enterprise services.
• Apply Spring Modulith, jMolecule, and ArchUnit to enforce clear domain boundaries and architectural rules.
• Promote clean code, automation, and strong SDLC discipline across development, testing, and delivery.

• Strong fundamentals in APIs, distributed systems, modular architecture, data design, scalability, resilience, and observability.
• Model domains with DDD, events, and asynchronous patterns; assess CQRS or event sourcing where they add value.
• Design cloud-native systems and data platforms using technologies such as Postgres, MongoDB, Elasticsearch, and AWS-led cloud services.

• Deep expertise across major relational database engines and managed RDS platforms, including PostgreSQL and cloud-native variants.
• Strong understanding of storage systems and fit-for-purpose data platforms, including transactional stores, document databases, search engines, vector stores, object storage, and event or streaming data layers.
• Expert in schema design, query tuning, indexing, partitioning, replication, high availability, disaster recovery, data residency, transaction consistency, and backup and restore for business-critical systems.

• Use spec-driven development to turn requirements into effective prompts, code, tests, and documentation.
• Structure repositories, modules, and design artefacts so they are readable and usable by LLM-based tools.
• Define practical prompting, review, and governance patterns that improve output quality and traceability.

• Apply AI agents to code generation, refactoring, dependency mapping, documentation, and design review.
• Required hands-on experience with vector databases and RAG patterns, including embeddings, chunking, indexing, retrieval, and grounding AI outputs in trusted enterprise data.
• Integrate MCP-compatible tooling into engineering workflows and CI/CD pipelines.
• Design deterministic, well-scoped, side-effect-safe services and tools that can be safely orchestrated by agents.

Benefits:

We are looking for intellectually curious people, passionate about the bigger picture of how technology industry is evolving, ready to ask difficult questions and deal with complicated scenarios! If you are creative and a problem solver, this is the place to be as will be supporting you to fast-forward your career!

We maximise each employee’s potential through personal development through a wide range of learning tools both formal and informal. We believe in remunerating our people with competitive salaries and a range of attractive benefits such as:

• 25 days’ holiday per year
• 1 additional day off for your Birthday
• Annual wellness allowance
• Share Purchase Plan
• Medical Health Insurance
• Medical Subscription (preventive medical services)
• Dental Coverage
• Life insurance
• Pillar 3 Private Pension
• Meal Vouchers
• Flexible Benefits
• Bookster
• Volunteering Events
• All LSEG colleagues with at least one year’s continuous service, who become parents, are now entitled to at least 26 weeks’ paid leave, and the option to return to work on a phased basis, in relation with specific company’s policy and guidelines

Career Stage:

London Stock Exchange Group (LSEG) Information:

Join us and be part of a team that values innovation, quality, and continuous improvement. If you're ready to take your career to the next level and make a significant impact, we'd love to hear from you.

LSEG is a leading global financial markets infrastructure and data provider. Our purpose is driving financial stability, empowering economies and enabling customers to create sustainable growth.

Our purpose is the foundation on which our culture is built. Our values of Integrity, Partnership, Excellence and Change underpin our purpose and set the standard for everything we do, every day. They go to the heart of who we are and guide our decision making and everyday actions.

Working with us means that you will be part of a dynamic organisation of 25,000 people across 65 countries. However, we will value your individuality and enable you to bring your true self to work so you can help enrich our diverse workforce.

We are proud to be an equal opportunities employer. This means that we do not discriminate on the basis of anyone’s race, religion, colour, national origin, gender, sexual orientation, gender identity, gender expression, age, marital status, veteran status, pregnancy or disability, or any other basis protected under applicable law. Conforming with applicable law, we can reasonably accommodate applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs.

You will be part of a collaborative and creative culture where we encourage new ideas. We are committed to sustainability across our global business and we are proud to partner with our customers to help them meet their sustainability objectives. Our charity, the LSEG Foundation provides charitable grants to community groups that help people access economic opportunities and build a secure future with financial independence. Colleagues can get involved through fundraising and volunteering.

LSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.

Please take a moment to read this privacy notice carefully, as it describes what personal information London Stock Exchange Group (LSEG) (we) may hold about you, what it’s used for, and how it’s obtained, your rights and how to contact us as a data subject.

If you are submitting as a Recruitment Agency Partner, it is essential and your responsibility to ensure that candidates applying to LSEG are aware of this privacy notice.