Python Developer

We are looking for a m i d-level software engineer to join our team. In this role, you will contribute to building and enhancing systems that power large-scale optimisation runs used by global financial institutions. You’ll collaborate with colleagues in Product Development and Financial Engineering to deliver reliable, high-quality solutions, while continuing to develop your expertise in infrastructure systems and software engineering.

You will validate and integrate financial data into the optimisation algorithms and ensure results are delivered back to clients in a secure, reliable, and timely way. You will also develop analytics and feedback capabilities that help both our Product management team and clients better understand outcomes and identify ways to improve future optimisation runs through adjustments to inputs, parameters, and workflows.

Our technology stack is centred on Python on the backend, with extensive use of AWS services, and React on the frontend. Data is managed across PostgreSQL (RDS), Redshift/Snowflake, and S3.

Key Responsibilities

• Design, build, and deliver high-quality software solutions both independently and as part of a wider engineering team

• Develop APIs and backend services for scenario generation and integration with quantitative libraries

• Evaluate and improve the performance, effectiveness, and reliability of system components

• Validate and process client data accurately and securely

• Identify and implement opportunities to automate processes and workflows

• Generate structured reports and formatted output files for delivery to clients and third-party APIs

• Strong Python skills
• Experience working with trade booking, middle-office, or post-trade systems, and familiarity with standards such as MarkitWire , FpML , or FIX protocol
• Familiarity building data-intensive applications, including use of PyData stack
• Strong problem-solving, communication, and collaboration skills

• Familiarity with Unix/Linux, Git, and SQL Desirable

• Knowledge of financial derivatives, clearing and the basics of margin and capital regulatory requirements
• Exposure to AI-assisted tools or workflow automation in a secure, responsible engineering environment
• Experience across the full software development lifecycle, and understanding of software design principles (including SOLID), clean code practices, and object-oriented programming
• Affinity with Java and/or C++ programming

Pulled from the full job description

• Paid volunteer time

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 .

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