Senior Software Engineer - Index, Data Integration London, GBR

Bloomberg Indices is a global leader in benchmark and investable index solutions, supporting trillions of dollars in assets across equity, fixed income, and multi-asset strategies. At the core of this business is high-quality, transparent, and reliable data. Our engineering teams build the platforms and tools that enable large-scale financial datasets to be sourced, validated, enriched, and delivered with confidence, forming the foundation for index construction and downstream analytics.

The Index Data Integration team focuses on the systems that sit closest to this data foundation. We build internal web applications that help users discover datasets, assess their quality, and manage the workflows required to turn raw inputs into trusted index data. Our software supports teams across Product and Operations, enabling them to make informed decisions quickly and consistently in a data-intensive environment where accuracy is critical.

As a Senior Software Engineer on this team, you will play a key role in designing and evolving full-stack applications that combine intuitive user experiences with robust backend services. You will work in a collaborative, agile team that partners closely with stakeholders, iterates quickly, and values clear communication and thoughtful engineering. The role blends hands-on development with technical leadership, giving you ownership over features from early design through production rollout.

We will trust you to:

• Design, build, and maintain full-stack web applications using Python on the backend and React with TypeScript on the frontend.
• Take technical ownership of features, driving them from concept and design discussions through implementation, testing, and production release.
• Collaborate closely with Product and Operations partners to understand workflows, identify pain points, and propose pragmatic, high-impact solutions.
• Set a high bar for code quality, testing, and maintainability, contributing to architectural decisions and continuous improvement of the codebase.
• Review designs and implementations, providing thoughtful feedback and helping shape consistent engineering practices across the team.

You will need to have:

• Strong experience building production-grade web applications with modern JavaScript frameworks, specifically React and TypeScript.
• Solid backend development experience with Python, including designing APIs and working with data-intensive services.
• A strong foundation in object-oriented programming and software design principles.
• Experience working in an agile environment, delivering iteratively and collaborating across engineering, product, and non-technical teams.
• Excellent communication skills, with the ability to explain technical concepts clearly and engage effectively in design and problem-solving discussions.

We would love to see:

• Experience with modern frontend best practices, such as component-driven development, state management, frontend testing, and design systems.
• Familiarity with data-focused systems, including data validation, ingestion pipelines, or large-scale datasets.
• Experience prototyping or collaborating on designs using Figma to support early feedback and alignment.
• Experience with C# or other strongly typed backend languages in a production environment.

If you enjoy building high-impact software, collaborating closely with stakeholders, and taking ownership of systems that matter to global financial markets, this role offers the opportunity to make a visible and meaningful contribution.