C++ Software Engineer

Citadel Securities; Dublin; On-site; EUR 110,000 - 180,000; Full time

Benefits offered by this job

Relocation package

Job summary

Citadel Securities, a leading global market maker, seeks engineers to design and optimize high-performance trading systems in a fast-paced environment. You will work on latency-sensitive infrastructure and collaborate with traders and researchers to push the boundaries of what is possible in modern markets.

The role requires strong C++ expertise, a solid grasp of multithreading and distributed systems, and a proactive drive to improve systems.

Qualifications

• Proficient in high-performance C++ with attention to clean, maintainable code.
• Strong understanding of concurrency, synchronization and thread safety.
• Curious mindset and drive to improve existing systems.

Responsibilities

• Break down complex trading-related challenges and implement robust solutions.
• Design, build and scale high-performance systems that support global trading workflows.
• Push latency, reliability and throughput improvements in a distributed environment.
• Collaborate with traders, researchers, and engineers to deploy ideas into production.
• Operate, monitor and improve production systems on an ongoing basis.

Skills

C++

Multithreading

Distributed systems

Education

Bachelor’s degree in CS/Engineering or related field

Job description

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.