Senior Software Engineer (Python) in London

Join to apply for the Senior Software Engineer (Python) role at CFC. Working within our Cyber Data Services or our Data & AI business unit, these roles sit at the core of our Proactive Insurance product offering and CFC's promise to protect our policyholders from existing and emerging cyber security vulnerabilities and threats.

You will play key roles in developing the company's competitive advantage in aggregating, presenting, and analysing large datasets. Across both roles, you will contribute to our proprietary data platforms and microservices, solving problems that are critical to protecting our policyholders and enabling high-quality underwriting decisions. Your contributions will have a material impact on the business as a whole.

You will be expected to design and implement new data capabilities (ingesting large datasets, building robust & high‐performance APIs, consuming high‐frequency event streams), as well as improve the quality and reliability of our existing products and solutions.

As part of our Software Engineering team focused on cyber data, you will:

• Contribute using our standard tech stack: Python, Linux (via WSL), PostgreSQL, SQL Server, Databricks, spanning Azure and AWS cloud infrastructure.
• Participate in the design and implementation of advanced mechanisms for data ingestion and transformation, and mass‐parallel orchestration of network IO.
• Build robust & high‐performance APIs, ensuring compliance with relevant CFC API Standards.
• Model data for operational and analytical purposes in collaboration with engineering and analytical data customers.
• Define and improve indicators of data quality across our estate, raising completeness, accuracy, and timeliness.
• Evaluate the quality (completeness and accuracy) of potential new data sources for specific applications.
• Maintain Infrastructure as Code and work with infrastructure teams to enhance CFC's Engineering Platform.
• Contribute to quality automation in our CI/CD process, optimising for bug‐free release cadence and developer delight.
• Maintain good documentation (starting with your code) for technical and non‐technical audiences.
• Participate in a pairing‐first development culture; mentor and coach less experienced team members through design and code reviews.
• Contribute to test automation (platform enhancements and additional tests).
• Assess application security to ensure adherence to CFC Application Security Standards.
• Evaluate APIs to ensure that they comply with the relevant CFC API Standards.

You are able to grasp, articulate, and advocate for technological solutions in both technical and non‐technical settings and intelligently apply agile principles as you do so. Also:

• You have demonstrable experience as a senior software developer or engineer with a focus on Python (4+ years).
• You love SQL (Postgres, SQL Server, Databricks) and are comfortable working without an ORM.
• You have experience building well‐documented, RESTful APIs (FastAPI, Flask) and working with structured/semi‐structured data (JSON, APIs).
• You are familiar with the challenges of working with data at scale and designing distributed, asynchronous microservices.
• You have a strong understanding of cloud environments (Azure or AWS), containerisation (Docker), and asynchronous programming.
• You have experience with Infrastructure as Code (Terraform) and CI/CD workflows (including YAML pipelines).
• You have prior experience leading technical decisions and mentoring engineers; you take ownership and communicate clearly (including remote/asynchronous settings).
• Experience with Databricks and AI orchestration tools (e.g., LangChain) is a plus.
• Insurance knowledge is advantageous but not required.
• You hold an undergraduate degree or can demonstrate equivalent knowledge in Computer Science, Software Engineering, Logic, Applied Statistics, Actuarial Science, Data Science, or related disciplines.