Principal Engineer (AWS & Java)

Act as the senior‑most technical authority for implementation within the Risk Screening platform, ensuring designs are realised accurately and pragmatically.

Work in close partnership with enterprise and solution architects to validate designs, challenge assumptions, and guide effective development approaches by the engineering teams.

Lead the implementation of the most complex and business‑critical changes, setting the standard for quality, performance, and maintainability.

Provide hands‑on expertise in Java‑based systems, including concurrency, performance tuning, memory management, and API design.

Take a leading role in defining, implementing, and validating non‑functional requirements, including system latency, throughput, scalability, and reliability.

Drive solutions for cloud scaling and capacity management, ensuring the platform performs predictably under variable and peak loads.

Provide deep expertise in working with large databases and data stores, including performance optimisation, data access patterns, and operational scaling.

Solve the most complex and ambiguous technical problems, particularly those spanning multiple components or teams.

Act as a point of escalation for deep technical issues that require system‑level understanding and experience.

Support engineering teams in making sound technical decisions, helping them understand trade‑offs and long‑term consequences.

Serve as a deep AWS expert, guiding teams on best‑practice use of AWS services with a strong focus on elastic cloud scaling and performance under load.

Ensure implementations support horizontal and vertical scaling, efficient resource utilisation, and predictable behaviour as demand grows.

Guide and review approaches to autoscaling, and workload management, aligned with agreed architectures.

Review cloud implementations to confirm they meet expectations for availability, scalability, cost-efficiency, and compliance.

Proactively identify operational risks, scaling limits, and reliability concerns within existing and planned implementations.

Drive improvements in resilience, monitoring, alerting, and incident prevention, informed by production behaviour.

Partner with Site Reliability Engineers, platform, and operations teams to improve system operability and reduce customer impact.

Champion engineering standards across coding, testing, deployment, and operational readiness.

Conduct deep technical reviews of critical changes, focusing on non‑functional requirements such as performance, security, and reliability.

Help teams reduce technical debt through pragmatic, incremental improvements aligned to product priorities.

Act as a technical mentor and coach to senior engineers and technical leads across the organisation.

Support engineers in developing stronger implementation skills and deeper system‑level thinking.

Influence engineering culture through example, constructive challenge, and a focus on practical excellence.

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.

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