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Senior Python Software Engineer

Citadel Securities
senior
Location

London, United Kingdom

Work Type

Onsite

Seniority

senior

Posted

July 23, 2026


Total Compensation
€305,500
Yearly Savings (Comfortable)
€159,643
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Job Description

Role Summary

Citadel Securities is a leading global market maker across a broad array of fixed income and equity securities. Our world-class capabilities position us to meet the liquidity demands of our diverse group of institutional clients in all market conditions. In partnering with us, our clients, including asset managers, banks, broker-dealers, hedge funds, government agencies and public pension programs are able to gain a powerful trading advantage and are better positioned to meet their investment goals.

In our mission to be the most successful investment team in the world, we hire the brightest minds in technology, research, and finance to create innovative solutions that impact the financial markets and take data analysis to new levels. Software Engineers create next generation software solutions to support business areas across the firm. Software Engineers work closely with business leaders to develop and deliver custom software solutions that optimize performance and efficiency.

Responsibilities

  • Design, develop, test, and deploy elegant software solutions across the firm
  • Partner with business leaders to define priorities and deliver custom technology solutions
  • Analyze complex business and technical problems
  • Make sound decisions proactively and in a self-directed manner
  • Provide timely systems support for trading activities

Skills and Qualifications

  • A deep passion for technology and software development
  • In-depth experience working in Python
  • The ambition to solve open-ended problems using analytical methods
  • Knowledge of Linux systems
  • Strong scripting experience with an ability to integrate various components and systems (in-house and third party)
  • Professional experience working with distributed systems
  • Knowledge of SDLC methodologies
  • Strong communication and interpersonal skills applicable to a dynamic trading environment
  • Minimum Bachelor’s degree in Computer Science or related field

Preferred Qualifications

  • Experience with proprietary trading and market making
  • Experience with ML techniques and statistical methods
  • Experience with C++, kdb, and SQL

Opportunities may be available from time to time in any location in which the business is based for suitable candidates. If you are interested in a career with Citadel, please share your details and we will contact you if there is a vacancy available.

About Citadel Securities

Citadel Securities is a technology-driven, next-generation global market maker. We provide institutional and retail investors with world-class liquidity, competitive pricing and seamless front-to-back execution in a broad array of financial products. Our teams of engineers, traders and researchers harness leading-edge quantitative research and the accelerating power of compute, machine learning and AI to power our analytics and tackle the market’s and our clients’ most critical challenges. Together, we are forging the future of capital markets. For more information, visit citadelsecurities.com.

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