{"id":2220175,"url":"https://alion.io/job/citi-senior-software-engineer-ultra-low-latency-risk-engine-developer-vp","title":"Senior Software Engineer – Ultra Low Latency Risk Engine Developer (VP)","company":{"id":7841,"name":"Citi","domain":"citi.com","url":"https://alion.io/company/citi","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"A","score":100,"open_postings":384,"ghost_share":0.008,"stale_share":0.005,"repost_share":0.089,"time_to_fill_p50_days":10,"computed_at":"2026-10-21T05:46:15Z"}},"role":"Backend","role_family":"Backend","seniority":"head","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Belfast, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":72000,"max_usd":171000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":133},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"Java","optional":false},{"name":"Linux","optional":false},{"name":"Rust","optional":false}],"status":"live","first_seen_at":"2026-10-08T00:00:00Z","employer_posted_date":"2026-10-08","last_verified_at":"2026-10-22T04:54:51Z","board_verified":true,"closed_at":null,"days_open":14,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":14},"description":"Discover your future at Citi\nWorking at Citi is far more than just a job. A career with us means joining a team of more than 230,000 dedicated people from around the globe. At Citi, you’ll have the opportunity to grow your career, give back to your community and make a real impact.\nJob Overview\nEngineer the future of global finance. At Citi, our Tech team doesn’t just support finance - we are helping to redefine it. Every day, $5 trillion crosses through our network. We do business in 180+ countries operating at a scale few can match. From deploying advanced AI to helping shape global markets, we build systems that matter. Look to join a team where your work helps influence economies, your ideas can drive innovation and outcomes, and your growth is backed by mentorship, continuous learning and flexibility with potential hybrid work opportunities. Help solve real-world challenges that touch millions and get the opportunity to build the future of finance with Citi Tech.\nCiti's Equities Technology organization is seeking a Senior Software Engineer - Ultra Low Latency Risk Engine Developer to join the Equities Electronic Execution (Electronic Trading) technology team. This role is focused on the design, development, and delivery of Citi's next-generation low-latency Risk Engine for cash equities and its integration into the broader execution platform - encompassing the Centralised Position Service, Client Connectivity, Market Access layers, and high-throughput market data processing.\nThe engineer will own critical, latency-sensitive risk-checking components that sit directly in the cash equities trading hot path, ensuring pre-trade and real-time risk controls are enforced with microsecond-level performance while maintaining correctness and resiliency at scale. This is a hands-on, deeply technical role that also carries leadership responsibilities - mentoring engineers, driving architecture decisions, and coordinating delivery across global development centers.\nThe person will collaborate closely with product development, quantitative research, technology infrastructure, production support, and QA teams, with close alignment to global strategy and cross-regional delivery (APAC, EMEA, NAM).\nResponsibilities:\nPartner with multiple management teams to ensure appropriate integration of functions to meet goals as well as identify and define necessary system enhancements to deploy new products and process improvements\nResolve variety of high impact problems/projects through in-depth evaluation of complex business processes, system processes, and industry standards\nProvide expertise in area and advanced knowledge of applications programming and ensure application design adheres to the overall architecture blueprint\nUtilize advanced knowledge of system flow and develop standards for coding, testing, debugging, and implementation\nDevelop comprehensive knowledge of how areas of business, such as architecture and infrastructure, integrate to accomplish business goals\nProvide in-depth analysis with interpretive thinking to define issues and develop innovative solutions\nServe as advisor or coach to mid-level developers and analysts, allocating work as necessary\nAppropriately assess risk when business decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citigroup, its clients and assets, by driving compliance with applicable laws, rules and regulations, adhering to Policy, applying sound ethical judgment regarding personal behavior, conduct and business practices, and escalating, managing and reporting control issues with transparency.\nRisk Engine & Core Development\nDesign, develop, and maintain the ultra low-latency, in-line Risk Engine responsible for real-time pre-trade risk checks, position limits, and exposure controls across cash equities electronic execution flows.\nArchitect and optimize high-performance, lock-minimal, multi-threaded components capable of processing risk decisions in the sub-microsecond to low-microsecond range.\nIntegrate risk and position components with Client Connectivity, Market Access layers, and high-throughput market data feed handlers.\nApply deep expertise in JVM performance tuning, memory management, garbage collection avoidance, and/or native (C++/Rust) performance engineering to eliminate latency outliers (\"jitter\") in the risk path.\nPerform system-level performance tuning to minimize end-to-end latency and jitter across the risk and execution path.\nRecommended Qualifications:\nProven software engineering experience, with substantial hands-on experience building risk management, position-keeping, or other latency-critical systems for cash equities electronic trading or algorithmic trading platforms at a global investment bank or equivalent financial institution.\nStrong, hands-on technical expertise in Low Latency Java and/or C++ (Rust a plus), including multi-threading, concurrency, lock-free data structures, Java NIO, and JVM/GC performance tuning.\nHands-on experience with low-latency messaging and IPC frameworks such as Aeron, Solace, or equivalent shared-memory/IPC technologies for building distributed, high-throughput trading systems.\nDemonstrated background in real-time distributed risk management systems for cash equities flow products, including asynchronous, event-driven architectures.\nPractical, hands-on experience with NUMA-aware design, CPU core pinning/affinity and isolation, Linux kernel/OS tuning, and low-latency networking (kernel bypass, RDMA, or specialized NIC tuning) for ultra low-latency, high-throughput systems.\nStrong understanding of automated testing techniques, test-driven development, and quality engineering practices for mission-critical systems.\nExcellent communication skills, with the ability to present and grasp complex technical and risk concepts in a multicultural, cross-regional environment, and to work effectively with globally distributed stakeholders (trading desks, quants, infrastructure, and support teams).\nWorking knowledge of regional exchange microstructure and relevant regulatory regimes governing cash equities electronic trading and risk controls.\nEducation:\nBachelor’s degree/University degree or equivalent experience\nMaster’s degree preferred\nThis job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.\nWhat we’ll provide you\nBy joining Citi, you will not only be part of a business casual workplace with a hybrid working model (up to 2 days working at home per week), but also receive a competitive base salary (which is annually reviewed), and enjoy a whole host of additional benefits such as:\n· 27 days annual leave (plus bank holidays)\n· A discretional annual performance related bonus\n· Private Medical Care & Life Insurance\n· Employee Assistance Program\n· Pension Plan\n· Paid Parental Leave\n· Special discounts for employees, family, and friends\n· Access to an array of learning and development resources\nVisit our Global Benefits page to learn more.\nAlongside these benefits Citi is committed to ensuring our workplace is where everyone feels comfortable coming to work as their whole self, every day. We want the best talent around the world to be energized to join us, motivated to stay and empowered to thrive.\n------------------------------------------------------\nJob Family Group:\nTechnology------------------------------------------------------\nJob Family:\nApplications Development------------------------------------------------------\nTime Type:\nFull time------------------------------------------------------\nMost Relevant Skills\nPlease see the requirements listed above.------------------------------------------------------\nOther Relevant Skills\nFor complementary skills, please see above and/or contact the recruiter.------------------------------------------------------\nCiti is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.\nIf you are a person with a disability and need a reasonable accommodation to use our search tools and/or apply for a career opportunity review Accessibility at Citi.\nView Citi’s EEO Policy Statement and the Know Your Rights poster.","description_format":"text","description_chars":8409,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":["Annual leave","Continuous learning","Hybrid work","Life insurance","Parental leave"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Financial Services","Wealth Management & Financial Advisors","Payment Processing & Gateways","Consumer Loans & Pawnshops"],"lifecycle":[{"event":"open","at":"2026-10-10T12:39:15Z"}],"visa":[],"liveness":{"score":45,"band":"ok","label":"Likely open","p_open":1,"p_active":0.817,"p_room":0.55,"age_days":13,"expected_fill_days":10,"reasons":["conf:0","velocity","win:tail","comp:brand"],"computed_at":"2026-10-21T05:46:15Z"},"pay":null,"html_url":"https://alion.io/job/citi-senior-software-engineer-ultra-low-latency-risk-engine-developer-vp","json_url":"https://alion.io/job/citi-senior-software-engineer-ultra-low-latency-risk-engine-developer-vp.json","meta":{"generated_at":"2026-10-22T05:05:47Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":5809,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-23T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":7841},"rest":"https://alion.io/mcp/rest/get_company?id=7841"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fciti-senior-software-engineer-ultra-low-latency-risk-engine-developer-vp"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fciti-senior-software-engineer-ultra-low-latency-risk-engine-developer-vp"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fciti-senior-software-engineer-ultra-low-latency-risk-engine-developer-vp"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/citi-senior-software-engineer-ultra-low-latency-risk-engine-developer-vp\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fciti-senior-software-engineer-ultra-low-latency-risk-engine-developer-vp"}]}