Principal Engineer

London Stock Exchange Group; Greater London; Hybrid; GBP 90,000 - 140,000; Full time

Job summary

London Stock Exchange Group is seeking a Principal Engineer to design, build, and operate secure, scalable enterprise applications across on-prem and AWS environments.

You will lead architecture, DevOps practices, and cross-functional collaboration, with strong emphasis on cloud security, observability, and disaster recovery. A senior hands-on role requiring deep expertise in .NET/C#, AWS, and SQL Server.

Qualifications

• Bachelor’s degree or equivalent in Computer Science, Engineering, or related field.
• Strong hands-on experience with .NET/C# and MS SQL.
• Extensive experience building highly-available distributed systems in on-prem and AWS.
• Excellent knowledge of AWS services (EKS, EC2, S3, RDS, Lambda, API Gateway, ECS, VPC, IAM, CloudWatch).
• Hands-on experience with relational and NoSQL databases (DynamoDB).
• Experience with message brokers (Kafka, RabbitMQ).
• Hands-on with CI/CD tools (Jenkins, GitLab CI, Ansible, Terraform).
• Observability platforms such as Datadog or Prometheus.
• Experience designing disaster recovery plans and drills.
• Cloud security best practices including IAM, encryption, vulnerability scanning, and audits.
• Nice to have AWS certifications such as AWS Solutions Architect or Developer.

Responsibilities

• Design and build highly available enterprise applications across on-prem and AWS.
• Collaborate with cross-geography stakeholders to gather requirements and deliver on timelines.
• Define and enforce standards for API design, development, and security.
• Lead on-prem and AWS infrastructure design with high availability.
• Troubleshoot complex distributed systems and resolve critical issues.
• Lead cloud security posture management and ensure enterprise compliance.
• Drive observability using Datadog/Prometheus to monitor performance.
• Mentor a geographically diverse software engineering team.

Skills

NET/C#

MS SQL

AWS

On-Prem & Cloud

Distributed Systems

API Design

CI/CD

Datadog/Observability

Security Best Practices

Disaster Recovery

Kafka

RabbitMQ

Terraform

Ansible

Jenkins

GitLab CI

Prometheus

Education

Bachelor’s degree in Computer Science, Engineering, or related field

Tools

Datadog

Prometheus

Terraform

Ansible

Jenkins

GitLab CI

Kubernetes (EKS)

Job description

## Principal EngineerApply: London, United Kingdom: Full time: Posted Today: R0123303## **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. LSEG’s ticker symbol is LSEG. ## **OUR PEOPLE:**People are at the heart of what we do and drive the success of our business. Our culture of connecting, creating opportunity and delivering excellence shape how we think, how we do things and how we help our people fulfil their potential. We embrace diversity and actively seek to attract individuals with unique backgrounds and perspectives. We break down barriers and encourage teamwork, enabling innovation and rapid development of solutions that make a difference. Our workplace generates an enriching and rewarding experience for our people and customers alike. Our vision is to build an inclusive culture in which everyone feels encouraged to fulfil their potential. We know that real personal growth cannot be achieved by simply climbing a career ladder – which is why we encourage and enable a wealth of avenues and interesting opportunities for everyone to broaden and deepen their skills and expertise. As a global organisation spanning 70 countries and one rooted in a culture of growth, opportunity, diversity and innovation, LSEG is a place where everyone can grow, develop and fulfil your potential with meaningful careers. ## **ROLE SUMMARY:**We are looking for a Principal Engineer with strong architecture and system design skills to build and maintain administrative platforms across on-premises and cloud environments. You will help us design, build, and operate secure, reliable, scalable, and cost-effective systems.The ideal candidate will have a strong background in software engineering, solution architecture, enterprise application development, and DevOps practices and tooling, with particular expertise in .NET/C#, AWS, and Microsoft SQL Server. You will play a key role within our technology team, contributing to the architecture, design, development, deployment, operation, and ongoing maintenance of our systems. **WHAT YOU'LL BE DOING:*** Design and build highly available enterprise applications, applying strong debugging skills to optimise mission-critical systems.* Collaborate with stakeholders across multiple geographies and cross-functional teams to understand project objectives, gather requirements, and deliver systems and software within agreed upon timelines.* Define and enforce technical standards, design patterns, and best practices for API design, development, and security.* Design and build on-prem and AWS infrastructure ensuring high availability.* Troubleshoot complex distributed systems and support the resolution of critical technical issues.* Lead cloud security posture management by designing systems in accordance with enterprise security standards.* Drive observability efforts using tools like Datadog to monitor infrastructure and application performance.* Mentor a high-performing, geographically diverse team of software engineers, fostering a culture of collaboration, automation, and continuous improvement. ## **WHAT YOU'LL BRING:*** Bachelor’s degree in Computer Science, Engineering, or related field, or equivalent experience.* Strong hands-on experience with .NET/C# and MS SQL.* Extensive experience building highly-available distributed systems in on-prem and AWS.* Strong hands-on experience with AWS cloud services (EKS, EC2, S3, RDS, Lambda, API Gateway, ECS, VPC, IAM, CloudWatch, etc.) and cloud architecture best practices.* Strong hands-on experience with relational databases and NoSQL databases (e.g. DynamoDB).* Strong hands-on experience with message brokers and event-driven architectures (e.g., Kafka, RabbitMQ).* Hands-on experience with CI/CD tools (e. g. Jenkins, GitLab CI, Ansible, Terraform).* Experience with observability platforms such as Datadog, Prometheus, or equivalent.* Track record of designing and executing disaster recovery plans and drills.* Solid knowledge of Cloud security best practices including IAM policies, encryption, vulnerability scanning, and compliance audits.**Nice to have:*** AWS Certifications such as AWS Certified Solutions Architect, Certified Developer or equivalent. **Career Stage:**Manager