Python Developer

London Stock Exchange Group; City of Westminster; On-site; GBP 65,000 - 95,000; Full time

Benefits offered by this job

Healthcare

Retirement planning

Volunteering days

Wellbeing initiatives

Job summary

London Stock Exchange Group is seeking a mid-level Python Developer to join a highly collaborative engineering team. You will contribute to building systems powering large-scale optimisation runs used by global financial institutions, validating client data, and delivering reliable outputs securely and efficiently.

The role centers on Python backend development with AWS, PostgreSQL, Redshift/Snowflake, and S3.

Qualifications

• Strong Python skills.
• Experience with trade booking, middle-office, or post-trade systems; familiarity with MarkitWire, FpML, or FIX.
• Familiarity building data-intensive applications, including PyData stack.
• Strong problem-solving, communication, and collaboration skills.
• Familiarity with Unix/Linux, Git, and SQL.

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

Skills

Python

PyData stack

Unix/Linux

Git

SQL

Job description

Python Developer

London Stock Exchange Group

London, United Kingdom

Permanent

2026-08-09T09:35:01.293Z

24593052

Full time

Competitive

The OptimisationCoreTech Strats teambuilds the systems that sit at the heart of Quantile's client services. As a large,diverse, and highly collaborativeengineering team, we are responsible for designing and delivering the infrastructure, applications, and data pipelines that allow financial institutions to securely submit risk and trade data to Quantile.

The Role

We are looking for a mid-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 centered 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

What We're Looking For

• 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

Career Stage: Senior Associate

About Us

London Stock Exchange Group (LSEG) is a leading global financial markets infrastructure and data provider. Join us and be part of a team that values innovation, quality, and continuous improvement. Our purpose is driving financial stability, empowering economies and enabling customers to create sustainable growth. Our values of Integrity, Partnership, Excellence and Change underpin our purpose and set the standard for everything we do, every day. Working with us means that you will be part of a dynamic organisation of 25,000 people across 65 countries. We are committed to diversity and equality, ensuring an inclusive environment where everyone's true self is valued.

We are proud to be an equal opportunities employer, respecting all aspects of individuality and accommodating various needs. Our collaborative and creative culture encourages new ideas, and we are dedicated to sustainability and social responsibility through initiatives like the LSEG Foundation.

Benefits include healthcare, retirement planning, paid volunteering days, and wellbeing initiatives. Please review our privacy notice for details on handling your personal information.