Python Developer - Commodities / Front-office

Harvey Nash Group; City Of London; Hybrid; GBP 70,000 - 90,000; Full time

Job summary

A leading investment bank in London seeks a Python Developer to develop and optimize financial calculators and build robust APIs. The role requires 5+ years of Python experience, with proficiency in Pandas and Flask. Strong communication skills and the ability to liaise with non-technical stakeholders are essential. This is a contract role with hybrid working arrangements.

Qualifications

• 5+ years of Python development experience, ideally in financial services or commodities.
• Strong proficiency in data manipulation with Pandas and NumPy.
• Proven experience with FastAPI or Flask.

Responsibilities

• Develop and optimize Python calculators.
• Build robust APIs using FastAPI or Flask.
• Collaborate directly with business users.

Skills

Python development

Experience in financial services

Proficiency in Pandas

Proficiency in NumPy

Experience with FastAPI

Experience with Flask

Data manipulation

Debugging skills

Communication skills

Tools

FastAPI

Flask

Docker

AWS/GCP

SQL

NoSQL

Job description

Python Developer - sought by leading investment bank based in Canary Wharf - Contract - Hybrid

Key Responsibilities

• Develop and optimize Python calculators for:
• Historical index back-testing
• Daily pricing and index computation
• Weighting and rebalancing logic
• Attribution and decomposition analytics
• Build robust APIs using FastAPI or Flask
• Collaborate directly with business users to gather requirements and iterate quickly
• Implement testing, versioning, and data validation processes
• Ensure integration with internal data sources and reporting tools

Required Skills

• 5+ years of Python development experience, ideally in financial services or commodities
• Strong proficiency in Pandas, NumPy, and time-series data manipulation
• Proven experience with FastAPI or Flask
• Familiarity with large datasets and real-time data pipelines
• Excellent debugging, profiling, and performance optimization skills
• Strong communication skills and ability to work with non-technical stakeholders

Preferred Skills

• Experience with commodities indices or structured products
• Knowledge of market data platforms (e.g., Bloomberg, Refinitiv)
• Exposure to Docker, AWS/GCP, and database systems (SQL/NoSQL)

Please apply within for further details - Matt Holmes, Harvey Nash