Senior Python Developer

We’re looking for a Senior Python Developer to join a data-focused team working on a new Security Master platform for a financial services client.

The project will involve building a multi-asset security data service covering equities, fixed income, funds and alternative assets across both the UK and US markets.

You’ll work alongside an established client Data Team, contributing hands-on Python development to the ingestion, processing and distribution of critical financial data.

This is an exciting opportunity for a senior developer who enjoys working with data-intensive systems, Python and modern cloud technologies, with the opportunity to develop further expertise within the financial services domain.

What You’ll Be Doing

• Contribute to the development of a new Security Master / security data service.
• Build and maintain Python-based data ingestion and processing pipelines.
• Ingest, clean, transform and process security reference data, daily pricing data and corporate actions.
• Work with multi-asset data covering equities, fixed income, funds and alternative assets.
• Support the internal distribution of high-quality, reliable security data.
• Work closely with the client’s Data Team and wider technical stakeholders.
• Develop robust, maintainable and scalable Python solutions.
• Work with relational databases, particularly PostgreSQL.
• Use modern Python data tools such as Pandas and/or Polars.
• Contribute to development workflows using Git and Jira.
• Help ensure data quality, consistency and reliability throughout the platform.

• Strong commercial experience as a Senior Python Developer / Software Developer.
• Excellent hands-on Python development skills.
• Experience working with PostgreSQL.
• Strong experience working with data processing libraries such as Pandas and/or Polars.
• Experience working with data ingestion, transformation or processing pipelines.
• Comfortable working within collaborative development environments using Git and Jira.
• Strong problem-solving skills and an ability to work with complex datasets.
• Able to work effectively alongside data engineers, developers and wider technical teams.

Nice to Have

• Knowledge or experience within financial markets / securities.
• Experience working with GCP BigQuery.
• Experience with GCP Cloud SQL.
• Experience with Terraform.
• Experience with Apache Airflow.
• Understanding of security reference data, pricing data or corporate actions.