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Principal Python Engineer

London, Greater London, South East, England

Apply by 8 Oct 2025

Job Ref.: BH-55560

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Consultant
Louis Thorne image
Louis Thorne
Senior Manager

Job Description

We are seeking a Principal Python Software Engineer to join a UK-based financial services team.

Responsible for designing and delivering clean, reusable code and component libraries that underpin front office technology.

You will build cloud-first architectures using AWS and expected to apply best practices across development, testing and deployment — contributing to CI/CD pipelines, working with DevSecOps approaches, and using version control workflows (Git/GitHub) to ensure robust, production-ready delivery.

You will bring strong experience building serverless and cloud-native solutions (for example AWS AppSync, Lambda and DynamoDB), and be comfortable working with both SQL and NoSQL data stores.

A deep understanding of core Python — including built-in libraries and commonly used third-party packages — together with a solid grasp of data structures and common data transformation techniques is essential. 

In summary
  • Minimum 5 years’ Python software development experience in an enterprise environment with strong experience with Amazon Web Services (particularly Lambda, AppSync, DynamoDB) and serverless/cloud-first architecture
  • Knowledge of SQL and NoSQL database platforms and proficiency with Python core libraries and widely used third-party packages
  • Understanding of data structures and data transformation methodologies
  • Experience working within Agile (Scrum) teams, DevSecOps practices, and CI/CD workflows
  • Familiarity with Git/GitHub for version control and collaboration

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