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Senior Software Engineer – St. Louis

Companies across the world face fast‑changing risks. Understanding and responding to those risks is essential to long‑term success. As part of our St. Louis engineering team, you will help deliver solutions that empower customers to protect their brand, make confident decisions, and move quickly in a complex environment.

We’re seeking a collaborative, motivated Senior Software Engineer who enjoys solving substantial problems, supporting other teams, and contributing to a culture of excellence. If you thrive in an empowered environment and want to make an impact on financial systems used across the organization, you’ll be an excellent fit.

What You’ll Do

As part of the Tools Team, you’ll work closely with internal development groups, business analysts, and quality engineers. Your work will directly support the tools and utilities that enable teams to deliver high‑quality software.

In this role, you will:

• Build, maintain, and improve tools that help internal teams work more effectively.
• Collaborate with multiple collaborators, each with their own priorities, in a dynamic environment.
• Participate in and lead code reviews to support consistent engineering standards.
• Help ushers LSEG’s progress toward full DevOps adoption.
• Develop scalable, future‑focused solutions in partnership with the architecture team.
• Work across multiple computer stacks and technology.
• Develop a strong understanding of the financial domain to support partner teams.

This position is ideal for someone who enjoys learning, adapting, and helping others succeed.

Required Experience

• Bachelor’s degree in Computer Science, Software Engineering, or a related field
• 5+ years of software development experience
• Experience with multiple programming languages (e.g., C#, C++)
• Strong understanding of Agile, Scrum, and DevOps practices
• Validated knowledge of data structures, algorithms, and design patterns
• Experience with version control systems (e.g., Git, DX1)
• Proficiency with databases and SQL
• Strong analytical and problem‑solving skills
• Excellent communication and collaboration skills

Preferred Skills

• Experience with scripting languages (e.g., Python, Perl)
• Familiarity with cloud platforms (AWS, Azure, or Google Cloud)
• Knowledge of containerization and orchestration (Docker, Kubernetes)
• Experience with automated testing frameworks
• Experience using AI tools to accelerate development
• We encourage the use of AI, including tools like Copilot, to improve efficiency and code quality.
• Ability to evaluate new AI tools and make suggestions on how they can enhance team efficiency
• Experience integrating AI‑powered automation into development workflows
• Familiarity with prompt‑engineering techniques to get the most from AI coding assistants

What We Offer

• Comprehensive health and wellness benefits
• Flexible working hours and remote‑work options
• Paid time off for vacation, holidays, and sick leave
• A supportive, creative, and growth‑focused work environment with opportunities for career advancement

Join us as we reshape the future of financial markets—and build tools that make a real impact.

Career Stage: Senior Associate

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.