Senior Platform Infrastructure Engineer

Citadel Securities; New York (NY); On-site; USD 120,000 - 150,000; Full time

Job summary

Citadel Securities is looking for a Senior Platform Infrastructure Engineer to join the Platform Engineering team in New York. This role involves design and development of core infrastructure components critical to the success of trading strategies across the globe.

The ideal candidate will have advanced C++ and Python programming skills, a strong background in Linux systems, and proven experience with distributed systems in production environments.

Qualifications

• Minimum 5 years of experience in advanced C++ and Python programming, including production-level development.
• Strong proficiency in building, deploying, configuring, and troubleshooting Linux systems.
• Experience with distributed systems in production environments.

Responsibilities

• Design and maintain critical infrastructure software.
• Collaborate with production teams to evolve tools for trading applications.
• Troubleshoot issues across distributed trading systems.

Skills

C++ programming

Python programming

Linux systems

Distributed systems

SDLC processes

Tools

Jira

Git

Jenkins

Bazel

Job description

Citadel Securities is seeking an exceptional Senior Platform Infrastructure Engineer to join our Platform Engineering team in New York. Our team is responsible for building and maintaining the foundational platform that orchestrates application execution at scale—including deployment, configuration, and reliability—for our high frequency trading systems operating across the globe. This critical infrastructure is leveraged daily by Site Reliability Engineers (SREs) to ensure the seamless operation of the firm’s trading platforms.

As a key technical member, you’ll take ownership of design and development for core infrastructure components. This role is a unique opportunity to make a direct and significant impact on systems critical for the successful execution of cutting-edge trading strategies enterprise-wide.

We are building software infrastructure to reliably run a constantly changing trading system that contains many thousands of interdependent applications in many thousands of hosts in dozens of locations all around the globe.

We are looking for candidates with a passion for robust distributed systems, solid software engineering fundamentals, and demonstrable experience deploying and managing production-scale trading infrastructure.

Locations

Miami, New York City

Responsibilities

• Design, develop, and maintain critical infrastructure software (notably components like process scheduler, configuration and deployment managements system and process state observability systems)
• Collaborate with SREs and production teams worldwide to continuously evolve the deployment, configuration, and management tools for trading applications
• Troubleshoot, diagnose, and resolve complex issues across distributed trading systems to ensure optimal performance and stability
• Author and maintain comprehensive unit and integration tests to ensure high-quality, reliable code
• Contribute to and improve SDLC processes by leveraging industry-standard tools (e.g., Jira, Git, Jenkins, Bazel), with flexibility to adapt to evolving technology stacks
• Document solutions and processes to enable firmwide adoption and ensure knowledge transfer across teams

Qualifications

• Minimum 5 years of commercial experience with each of the following:
• Advanced C++ and Python programming, including production-level development
• Writing maintainable unit and integration tests
• Linux systems as a daily user (strong proficiency in building, deploying, configuring, and troubleshooting)
• Hands-on experience with distributed systems in production environments
• SDLC and tooling (such as Jira, Git, Bazel, Jenkins, or equivalent alternatives)

Preferred

• Expertise or experience with any of the following will be regarded as a strong plus:
• Job scheduling and orchestration tools (e.g., Slurm, Airflow), especially at a developer level
• Deep familiarity with Linux internals and tooling (systemd, cgroups, FUSE, etc.)
• Security protocols relevant to infrastructure (TLS, Kerberos, Active Directory, etc.)
• Cloud infrastructure management, infrastructure-as-code (Terraform)