Senior Platform Infrastructure Engineer

Join to apply for the Senior Platform Infrastructure Engineer role at Citadel Securities1 day ago Be among the first 25 applicantsJoin to apply for the Senior Platform Infrastructure Engineer role at Citadel SecuritiesGet AI-powered advice on this job and more exclusive features.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.LocationsMiami, New York CityResponsibilitiesDesign, 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 applicationsTroubleshoot, diagnose, and resolve complex issues across distributed trading systems to ensure optimal performance and stabilityAuthor and maintain comprehensive unit and integration tests to ensure high-quality, reliable codeContribute to and improve SDLC processes by leveraging industry-standard tools (e.g., Jira, Git, Jenkins, Bazel), with flexibility to adapt to evolving technology stacksDocument solutions and processes to enable firmwide adoption and ensure knowledge transfer across teamsQualificationsMinimum 5 years of commercial experience with each of the following:Advanced C++ and Python programming, including production-level developmentWriting maintainable unit and integration testsLinux systems as a daily user (strong proficiency in building, deploying, configuring, and troubleshooting)Hands-on experience with distributed systems in production environmentsSDLC and tooling (such as Jira, Git, Bazel, Jenkins, or equivalent alternatives)PreferredExpertise 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 levelDeep 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)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 Securities, please share your details and we will contact you if there is a vacancy available.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. 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