Principal Engineer

LSEG; Greater London; On-site; GBP 110,000 - 150,000; Full time

Job summary

London Stock Exchange Group (LSEG) is seeking a Principal Engineer to lead architecture and design of administrative platforms across on-premises and cloud environments. You will design, build, and operate secure, reliable, scalable systems with a focus on .NET/C#, AWS, and SQL Server.

The role emphasizes collaboration with global teams, setting technical standards, and mentoring engineers while delivering high-availability solutions and robust security practices.

Qualifications

• 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.

Responsibilities

• 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.

Skills

Architecture

System design

Mentoring

Education

Bachelor's degree in Computer Science or related field

Tools

.NET/C#

MS SQL

AWS

Kafka

RabbitMQ

Terraform

Datadog

Prometheus

Jenkins

GitLab CI

Ansible

Job description

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.

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

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.