Entry Level Financial Software Developer Jobs in St Louis, MO

As a Senior Software Engineer, you will contribute to the development of highperformance, realtime applications that process some of the world's most critical financial data. Our systems ingest information from global exchanges and deliver normalized, consistent market data to clients within milliseconds.

You will work primarily in C++ within a Linuxfocused environment, collaborating with expert engineers while continuing to strengthen your skills in performance engineering, market data systems, and AIenhanced development workflows.

• Design, develop, and maintain clean, efficient, and wellstructured applications.

• Use AI-assisted tools to support development tasks such as code generation, analysis, testing, and troubleshooting.

• Participate in code reviews to ensure code quality and consistency across the team.

• Develop and maintain robust unit tests and integration tests to support application quality and resilience.

• Collaborate with senior engineers and architects on design and implementation of features.

• Assist in integrating software into test and production environments by teaming with QA and Operations teams.

• Investigate and debug issues across development and test environments, including multi-threaded scenarios.

• Contribute to planning, refinement, and design discussions for new features and improvements.

• Work closely with teammates, Technical Architects, and Product Owners to implement solutions aligned to functional requirements.

• Communicate progress and technical details clearly within the team and to stakeholders.

• Responsibility of work you're doing while proactively seeking clarification or mentorship when needed.

• Expand your technical skillset through hands-on experience, training, and certifications.

• Establish understanding of system dependencies and broader business workflows over time.

• Bachelor's degree in Computer Science, Engineering, or equivalent experience.

• Strong programming experience with C++ and objectoriented development.

• Experience working within Linux development environments.

• Understanding of the full software development lifecycle.

• Strong problemsolving and analytical abilities.

• Familiarity with debugging tools and test-driven development.

• Ability to learn new technologies quickly and apply them optimally.

• Strong written and verbal communication skills.

• Experience with scripting languages such as Python, Bash, or PowerShell.

• Exposure to Agile development methodologies.

• Knowledge of automated testing frameworks.

• Understanding of multi-threaded programming concepts.

• Experience with containerized development and deployment (Docker, Kubernetes).

• Experience with Rust programming language or interest in learning Rust for development.

• Experience with or curiosity about:

  Real-time or low-latency systems

  Market data feeds or financial technology

• Familiarity with using AI tools in the software development lifecycle.

• Experience building highthroughput, lowlatency systems at global scale.

• Access to mentorship from experts.

• An inclusive, collaborative engineering culture focused on learning and continuous improvement.

• Opportunities to deepen your expertise in C++, Linux, realtime systems, and AI-assisted engineering.

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 organization 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, color, 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.

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.

Career Stage:

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.