# Site Reliability Engineer [Citadel Securities](https://www.jorb.ai/firms/citadel-securities.md) · London · United Kingdom · [Site Reliability Engineering (SRE)](https://www.jorb.ai/jobs/site-reliability-engineering-sre.md) Citadel Securities is hiring a Site Reliability Engineer in London. Posted 2026-05-29; applications close 2026-07-28. **Apply**: https://www.citadelsecurities.com/careers/details/site-reliability-engineer/ Posted 18d ago. ## Role details 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. ## Objectives ### Candidates with less than 3 years of experience - Good knowledge of UNIX/Linux command line. - Good understanding of the usage of TCP/IP and UDP networking in applications. - Basic understanding of network routing and troubleshooting. - Basic experience in writing SQL database queries. - Basic experience in Bash, Python or other scripting languages. ### Candidates with 3+ years of experience - First line support and root cause problem diagnosis within a real-time, distributed environment. - Large-scale application and infrastructure capacity planning and deployment. - Organizing application migrations and infrastructure upgrades. ## Behavioral Requirements - Clear ability to collaborate with multiple colleagues and lead brainstorming and other live troubleshooting sessions. - Good verbal communication skills with a self-driven, inquisitive attitude to problem solving. - Clear ability to manage multiple priorities and deadlines. - Genuine curiosity in technology and staying abreast of current technology trends. ## Skills and Preferred Qualifications - Trading desk support experience and knowledge of trading systems and applications. - Intermediate-level Python development experience. - Understanding of operating system performance tuning. ## Compensation & Benefits In accordance with applicable law, the base salary range for this role is $125,000 to $350,000. In addition, the employee who fills this role will be eligible to participate in a discretionary incentive compensation program, as well as a wide array of benefit programs, such as medical and life insurance, retirement and tax-free savings plans, and access to other healthcare programs. ## 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. ## Start Application ## Applying to this role This Site Reliability Engineer role at Citadel Securities runs through the firm's own careers portal and expects a CV and cover letter written specifically for the posting, not a portable submission carried across firms. Jorb AI's application agent tailors a CV and cover letter from your background to this posting and tracks the role alongside the rest of your applications. [Tailor this application](https://www.jorb.ai/signup?ref=job-atom&firm=citadel-securities&job=6a198039471c722e4024ddaa) ## More open roles at Citadel Securities - [Quantitative Researcher Engineer – PhD Intern (Europe)](https://www.jorb.ai/jobs/6a198039471c722e4024ddaf.md) – London, posted 18d ago - [Quantitative Researcher – PhD Intern (Europe)](https://www.jorb.ai/jobs/6a198039471c722e4024ddb9.md) – London, posted 18d ago - [Quantitative Research Analyst Intern – BS/MS (Asia)](https://www.jorb.ai/jobs/6a198039471c722e4024ddcc.md) – Hong Kong, posted 18d ago - [Quantitative Researcher – PhD Intern (Asia)](https://www.jorb.ai/jobs/6a198039471c722e4024ddcd.md) – Hong Kong, posted 18d ago - [Machine Learning Researcher – PhD Intern (US)](https://www.jorb.ai/jobs/6a198039471c722e4024ddd9.md) – New York, posted 18d ago ## Other open Site Reliability Engineering (SRE) roles - [Binance Accelerator Program - Infrastructure Security (Python/ LLM)](https://www.jorb.ai/jobs/69558686755b78493f7d0e69.md) at [Binance](https://www.jorb.ai/firms/binance.md) – Hong Kong, posted 5mo ago - [Incident Management Engineer](https://www.jorb.ai/jobs/69503bea24b8d487f7451b75.md) at [Palantir](https://www.jorb.ai/firms/palantir.md) – New York, posted 5mo ago - [Two Sigma Securities, Production Engineer](https://www.jorb.ai/jobs/69cd99700970b6ea05f3e598.md) at [Two Sigma](https://www.jorb.ai/firms/two-sigma.md) – London, posted 2mo ago - [Junior Site Reliability Engineer](https://www.jorb.ai/jobs/6a1e65ef1bcf4acaee2f9818.md) at [Tencent](https://www.jorb.ai/firms/tencent.md) – Singapore, posted 15d ago - [System Development Engineer I, Catalog Engineering Service Support](https://www.jorb.ai/jobs/6a1d8d30b3dba560cca75dbe.md) at [Amazon](https://www.jorb.ai/firms/amazon.md) – London, posted 16d ago --- Updated: 2026-06-17 Canonical: https://www.jorb.ai/jobs/6a198039471c722e4024ddaa