About the Role

As a Lead Software Engineer, you will define and drive the technical direction within a focused product or platform area. You will solve complex engineering challenges, guide others through code, design and architecture, and raise engineering standards across the team. This role blends deep hands‑on technical delivery with technical leadership, mentoring, and shaping the long‑term quality and resilience of our systems.

What You’ll Be Doing

• Design, develop, and deploy applications across all phases of the software lifecycle, ensuring high performance, security, and scalability.
• Architect and evolve distributed systems operating in cloud environments, with a focus on resilience, observability, and efficient operations.
• Build and maintain CI/CD pipelines, ensuring smooth, automated delivery and high‑quality releases.
• Collaborate on API development, integration patterns, and service‑to‑service communication.
• Work with modern infrastructure tooling (Azure, containers, dev containers, IaC) to support fast, reliable deployments.
• Apply expertise in Data Lake (ideally Delta), Change Data Feed, mirroring, AKS, events, and Microsoft Fabric to guide solution architecture and delivery.
• Provide hands‑on leadership, supporting engineers through code reviews, design walkthroughs, and architectural discussions.
• Raise engineering quality by influencing best practices, improving reusability, and reducing duplication across the platform.

What You’ll Bring

Technical Excellence

• Proven ability to design and implement complex, distributed systems operating at scale.
• Strong programming expertise in C#, with the ability to work comfortably with object‑oriented and functional patterns.
• Familiarity with Python as a secondary language for automation, tooling, or data workflows.
• Hands‑on capability with Spark SQL, PostgreSQL, and core data‑engineering patterns.
• Expertise with Microsoft Azure, modern cloud infrastructure, and dev‑container‑based workflows.
• Strong understanding of API design, integration patterns, and secure communication between services.
• Ability to apply domain knowledge to guide team‑level technical decisions, improve architecture, and drive consistency.

Leadership & Mentorship

• Own delivery of critical platform capabilities and provide clear technical direction.
• Guide and mentor peers, helping them grow in coding quality, architectural thinking, and engineering best practices.
• Influence technical decisions through hands‑on leadership, not hierarchy.
• Foster an environment of collaboration, learning, accountability, and continuous improvement.

Customer Focus

• Design solutions with an understanding of how systems behave in real‑world customer use.
• Take ownership of operational issues, respond quickly to incidents, and use data and feedback to enhance system reliability.

Risk Management

• Advocate for secure, safe delivery across software, infrastructure, and platform layers.
• Dive deep into trade‑offs, resolve blockers, and build resilience into team systems and practices from the start.

Analytical Approach

• Use data, metrics, and experimentation to validate assumptions and influence design choices.
• Encourage data‑driven decision‑making within the team to drive innovation and improvement.

Adaptability

• Promote new engineering methods, challenge outdated practices, and drive change across teams.
• Invest in ongoing development—of your craft and the team’s capabilities—through coaching, feedback, and technical guidance.

Communication

• Tailor communication to both technical and non‑technical audiences.
• Explain design decisions clearly and build a shared understanding that accelerates delivery.

Why Join Us

You’ll influence the architecture and direction of key systems powering LSEG’s global platforms. You’ll work with modern technology, collaborate with talented engineers, and contribute to solutions with real customer impact—all in an inclusive, growth‑focused environment.

Career Stage:

Manager

Compensation Information:

LSEG is committed to offering competitive Compensation and Benefits. The anticipated annual gross base salary for this position is between zł265,000 - zł419,000. Please be aware base salary ranges may vary by geographic location. In addition to our offered base salary, this role is eligible for our Annual Bonus Plan (”bonus plan”). Target Bonus % will be commensurate with role level and posted career stage. Individual salary will be reflective of job-related knowledge, skills and equivalent experience.

Benefits Information:

LSEG roles (excluding internships) are typically eligible for inclusion in our LSEG Benefits program. To view the benefits available for the role you're applying for, please click here. This document provides a list of benefits by country. Simply click on the country where the role is based to view the relevant details. If you have specific questions or would like further details, these can be discussed during your interview.

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.