Principal Engineer (AWS & Java)
London Stock Exchange Group5 months ago
London, United KingdomStaff+
Responsibilities
- Act as the senior-most technical authority for implementation on the Risk Screening platform.
- Lead implementation of complex and business-critical changes using hands-on Java expertise, including concurrency, performance tuning, memory management, and API design.
- Define, implement, and validate non-functional requirements covering latency, throughput, scalability, reliability, and resilience.
- Guide AWS cloud scaling, capacity management, autoscaling, workload management, resource utilization, availability, cost efficiency, and compliance.
- Optimize large databases and data stores, including data access patterns, performance, and operational scaling.
- Solve complex system-level technical problems and support engineering teams with technical decisions and trade-off analysis.
- Identify operational risks, scaling limits, and reliability concerns, and drive improvements in monitoring, alerting, incident prevention, and resilience.
- Partner with Site Reliability Engineering, platform, and operations teams to improve system operability and reduce customer impact.
- Conduct deep technical reviews covering performance, security, reliability, testing, deployment, and operational readiness.
- Mentor senior engineers and technical leads and influence engineering standards and culture through technical leadership.
Requirements
- Extensive experience as a Principal Engineer or equivalent senior technical role on large-scale production systems.
- Deep hands-on expertise in Java, with Java 11+ preferred, including JVM behavior, concurrency, and performance optimization.
- Strong practical experience building and operating systems on AWS, including real-world operational trade-offs.
- Proven ability to implement and operate distributed systems at scale, particularly systems requiring strong performance and scalability.
- Strong experience with large databases or data platforms, including performance tuning and operational management.
- Strong understanding of production operations, including incident management, observability, and reliability engineering.
- Ability to influence and guide teams through technical credibility rather than formal authority.
Benefits
- Healthcare benefits, retirement planning, paid volunteering days, and wellbeing initiatives are offered.
- The role is part of a collaborative and creative culture at LSEG, an equal-opportunities employer.
- Employees can participate in fundraising and volunteering through the LSEG Foundation.
About London Stock Exchange Group
London Stock Exchange Group (LSEG) provides market infrastructure, financial data, and analytics to banks, asset managers, and corporations. Its businesses span capital markets (London Stock Exchange), post-trade clearing (LCH), and information services including FTSE Russell indices and the Refinitiv data platform, funded by transaction fees, subscriptions, and licensing. Headquartered in London and publicly listed on the LSE, the group serves global customers seeking trading, clearing, benchmarks, and enterprise data solutions.