C++ Software Engineer

Citadel Securities; Paris; Sur place; EUR 120 000 - 160 000; Plein temps

Résumé du poste

Citadel Securities is seeking engineers to join its Paris-based team building and optimizing the firm’s high-performance trading infrastructure.

You will design and maintain fast, scalable C++ systems, collaborate with traders and researchers, and own production code from development through monitoring in production.

Qualifications

• Deep experience in C++ with a passion for clean, performant code.
• Strong grasp of multithreading, concurrency, and distributed systems.
• Curiosity to explore how things work and drive to improve them.
• Clear, thoughtful communication and the ability to thrive in a high ownership environment.
• Background in Trading or finance is a plus but not a requirement.

Responsabilités

• Break down complex challenges and deliver clear, elegant solutions with real-world impact.
• Design, build and maintain high-performance systems that underpin trading infrastructure.
• Push latency, reliability, and throughput in a distributed environment.
• Collaborate with traders, researchers, and engineers to move ideas into production.
• Own production code: monitor, support and improve it daily.

Connaissances

C++

Multithreading

Distributed systems

Communication

Formation

Bachelor’s degree in Computer Science, Engineering or related field

Description du poste

Citadel Securities is the next-generation capital markets firm and a leading global market maker. We provide institutional and retail investors with the liquidity they need to trade a broad array of equity and fixed income products in any market condition. The brightest minds in finance, science and technology use powerful, advanced analytics to solve the market’s most critical challenges, turning big ideas into real-world outcomes.

Role Overview:

We’re looking for driven innovators and optimizers who are excited about cutting-edge technology and making a measurable impact. If you’re passionate, obsessed with performance, and excited to work where nanoseconds matter.

Responsibilities:

• Solve What Matters: Break down intricate challenges and deliver clear, elegant solutions that drive real world outcomes
• Build and Scale: Design, build and maintain high performance systems that are the backbone of our trading infrastructure
• Optimize Everything: Continuously push the limits of latency, reliability, and throughput in a distributed environment
• Partner and Deliver: Collaborate directly with traders, researchers, and fellow engineers to deliver ideas into production
• Own it in production: Take pride in running your code live - Monitoring, supporting and improving it every day

Qualifications:

• Deep experience in C++ with a passion for clean, performant code
• A strong grasp of multithreading, concurrency, and distributed systems
• Curiosity to explore how things work and a drive to improve them
• Clear, thoughtful communication and the ability to thrive in a high ownership environment
• Bachelor’s (or higher) degree in a Computer Science, Engineering or related field
• Background in Trading or finance is a plus but not a requirement

This role requires you to be based in one of our global offices listed below. If you are not currently located in one of these cities, we offer a comprehensive relocation package to support your move:

Opportunities may be available from time to time in any location in which the business is based for suitable candidates.