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Posted 02 August, 2026

Python Developer

Lorien
London, ENG, GB Full Time

Job Description

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Senior Python Developer - Risk & PnL Team

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Location: London (Minimum 50% onsite)

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Contract Length: Initial 6-month contract (funded for several years with strong extension prospects)

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Day Rate: Competitive (inside IR35)

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Start Date: ASAP

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Overview

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We are seeking an experienced Senior Python Developer to join a high-performing Risk & PnL Team supporting a critical trading platform within a leading financial services environment.

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The team is responsible for the development and enhancement of TRACC, a business-critical application used by the Derivatives Execution & Clearing (DEC) business.

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The Role

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Working within a collaborative team of 3 Developers, 1 Business Analyst, 1 Tester and the Team Lead, you will be involved in all aspects of the platform's development and ongoing enhancement.

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The role covers:

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  • Core Python application development
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  • Web API design, development and maintenance
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  • Database development and optimisation
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  • Infrastructure and Server Side processes
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  • Front End enhancements using JavaScript/Angular
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  • Test automation and CI/CD improvements
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  • Working directly with business users and Middle Office stakeholders to understand and deliver requirements
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You will play a key role in driving Agile best practices, promoting high-quality engineering standards and helping shape the future direction of the platform.

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Key Responsibilities

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  • Design, develop and maintain Python-based applications and services
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  • Build and enhance APIs supporting critical business functionality
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  • Deliver enhancements and features through the Jira backlog
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  • Work closely with business stakeholders to gather, analyse and refine requirements
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  • Participate in sprint planning, technical discussions and solution design sessions
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  • Demonstrate completed work and new functionality to stakeholders
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  • Champion automated testing and continuous integration practices
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  • Identify opportunities for automation, simplification and platform improvements
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Essential Skills & Experience

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  • Expert-level Python development experience
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  • Strong experience building and maintaining Web APIs
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  • Solid understanding of SQL and database design
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  • JavaScript, HTML and web application development experience
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  • Proven experience with Test-Driven Development (TDD)
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  • Strong focus on automated testing and deployment practices
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  • Experience working with CI/CD tools, particularly Jenkins
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  • Excellent communication and stakeholder management skills
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Guidant, Carbon60, Lorien & SRG - The Impellam Group Portfolio are acting as an Employment Business in relation to this vacancy.