Python Developer

Overview

We are seeking a high-calibre Senior Python Developer to join our London-based Engineering squad. Sitting at the heart of our Front-Office analytics platform, you will bridge the gap between complex energy market fundamentals and high-performance software engineering.

You will be responsible for the architecture and delivery of scalable data products that power real-time trading decisions. As a senior member of the London hub, you will act as a technical lighthouse mentoring junior talent, driving TDD standards, and ensuring our cloud-native infrastructure is as agile as the markets we trade in.

Responsibilities

• Engineering Excellence: Design and build robust, low-latency Python solutions for processing large-scale financial and energy market datasets.
• Architectural Leadership: Lead decisions on system design, transitioning legacy scripts into scalable, containerised microservices.
• Stakeholder Engagement: Partner directly with Traders, Quants, and Product Managers to translate market requirements into production-ready code.
• Mentorship: Conduct rigorous code reviews and foster a culture of continuous learning for our mid-level and junior engineers.
• DevOps Culture: Own your code from local dev to production, leveraging CI/CD automation and Kubernetes orchestration.
• Operational Integrity: Troubleshoot business-critical production issues in a high-pressure, time-sensitive trading environment.

Technical Requirements

Core Stack (Must Have)

• Expert Python (3.9+): Mastery of OOP, Design Patterns (Factory, Strategy, Observer), and logical data modelling. Familiarity with recent PEPs.
• Data Science Tooling: Advanced use of pandas and SQLAlchemy. Experience with parquet and Arrow for high-performance memory management.
• Testing: Strong advocate for TDD/BDD (Pytest, Behave); experience in building automated integration test suites.
• Modern DevOps: Expert Git, Docker, and CI/CD pipelines (Azure DevOps/GitHub Actions).
• SQL Mastery: Deep knowledge of PostgreSQL or SQL Server (Query tuning, indexing strategies, and complex joins).

Preferred Skills

• Cloud & Orchestration: Hands-on Kubernetes (AKS/EKS) including Helm charts and StatefulSets.
• Market Knowledge: Previous experience with ETRM systems, tick data, or financial risk analytics.
• Build Tools: Experience with Poetry or uv for modern dependency management.

Qualifications & Experience

• Experience: 7+ years in professional software development, with a significant tenure in London’s Financial Services or Energy Trading sectors.
• Education: BSc/MSc in Computer Science, Mathematics, or a related Engineering field.
• Soft Skills: Exceptional communication skills; the ability to explain complex technical trade-offs to non-technical stakeholders in a fast-paced environment.