{"id":171129,"url":"https://alion.io/job/citi-senior-software-engineer-rust-or-c-equities","title":"Senior Software Engineer Rust OR C++ Equities","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":377,"ghost_share":0.008,"stale_share":0.003,"repost_share":0.088,"time_to_fill_p50_days":10,"computed_at":"2026-10-17T05:46:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Pune, India"],"countries":["IN"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":15000,"max_usd":35000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":139},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"CI/CD","optional":false},{"name":"CMake","optional":false},{"name":"Git","optional":false},{"name":"GitHub","optional":false},{"name":"GitHub Actions","optional":false},{"name":"Jenkins","optional":false},{"name":"Linux","optional":false},{"name":"Rust","optional":false},{"name":"STL","optional":false},{"name":"TCP/IP","optional":false}],"status":"live","first_seen_at":"2026-08-11T00:00:00Z","employer_posted_date":"2026-08-11","last_verified_at":"2026-10-17T14:50:30Z","board_verified":true,"closed_at":null,"days_open":67,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":67},"description":"Department Overview\nThe Equities Technology division is responsible for building and maintaining the high-performance, ultra-low-latency trading infrastructure that powers our global equities business. This includes market data dissemination, order routing, algorithmic execution, smart order routing (SOR), and real-time risk management systems. We operate in a highly competitive environment where microseconds matter, requiring cutting-edge software engineering practices, deep hardware-software co-design, and robust system reliability.\nRole Summary\nWe are seeking an exceptional Senior Software Engineer with deep expertise in Rust and C++ to join our Equities Low-Latency Trading Technology team.\nIn this role, you will design, develop, and optimize our next-generation trading systems. You will lead the strategic transition of legacy high-performance C++ components to modern Rust where safety and concurrency are paramount, while continuing to maintain and optimize critical ultra-low-latency C++ execution paths. This is a highly technical role requiring a strong understanding of computer architecture, operating systems, network protocols, and modern software engineering paradigms.\nKey Responsibilities\n1. System Design & Development\nArchitect, build, and maintain ultra-low-latency trading systems, including exchange connectivity gateways, market data feeds, and algorithmic execution engines using Rust and C++\nDesign clean, modular, and reusable APIs and libraries that can be leveraged across multiple trading desks.\nLead the strategic migration of critical trading components from C++ to Rust, leveraging Rust's memory safety and concurrency guarantees without sacrificing performance.\n2. Performance Optimization\nProfile and optimize systems to achieve sub-microsecond latencies and deterministic performance.\nApply low-latency techniques such as CPU pinning, cache-friendly data structures, lock-free programming, memory-mapped files, and custom memory allocators.\nUtilize kernel bypass technologies (e.g., Solarflare OpenOnload, DPDK, EF_VI) to minimize network stack overhead.\n3. Concurrency & Reliability\nDesign and implement highly concurrent, thread-safe, and lock-free algorithms to handle massive throughput with minimal jitter.\nImplement rigorous testing methodologies, including unit testing, integration testing, property-based testing (in Rust), and high-fidelity simulation/back testing environments.\nEnsure the high availability and operational resilience of trading systems through robust error handling and failover mechanisms.\n4. Collaboration & Support\nWork closely with quantitative researchers, traders, and product managers to translate complex trading strategies and business requirements into robust, production-ready software.\nBuild real-time telemetry, monitoring, and alerting tools to ensure operational visibility.\nProvide level-3 escalation support for production systems during market hours.\nRequired Technical Skills & Qualifications\nProgramming Languages\n C++: Expert-level proficiency in C++ (C++11/14/17/20), with a deep understanding of template metaprogramming, RAII, move semantics, smart pointers, and the standard library (STL).\nRust: Strong proficiency in Rust, including ownership/borrowing concepts, lifetimes, unsafe Rust boundaries, macro systems, and the Cargo ecosystem.\nSystems Programming & Low-Latency\nDeep understanding of Linux operating system internals (kernel tuning, memory management, virtual memory, page faults, system calls).\nExperience with low-latency networking (TCP/IP, UDP, Multicast) and socket programming.\nFamiliarity with hardware-level concepts: CPU cache hierarchies (L1/L2/L3), TLB, branch prediction, and memory barriers.\nConcurrency\nProven experience in multi-threaded programming, memory models (sequential consistency, acquire-release), and lock-free data structures.\nEquities Domain Knowledge\nSolid understanding of Equities market structure, order types, exchange protocols (FIX, OUCH, ITCH), and trading lifecycles.\nTools & Infrastructure\nExperience with profiling and debugging tools (gdb, valgrind, perf, VTune, heaptrack).\nProficiency with build systems (CMake, Cargo) and CI/CD pipelines (Git, Jenkins/GitHub Actions).\nPreferred Qualifications\nExperience with FPGA integration or hardware acceleration.\nExperience with kernel bypass technologies (Solarflare EF_VI, OpenOnload, DPDK).\nKnowledge of market-making, smart order routing (SOR), or statistical arbitrage execution strategies.\nBachelor’s or Master’s degree in Computer Science, Computer Engineering, or a related quantitative field.\nCore Competencies\nAnalytical Thinking: Strong problem-solving skills with the ability to analyze complex systems and identify performance bottlenecks.\nCollaboration: Excellent communication skills with the ability to work effectively in a fast-paced, cross-functional team environment.\nAdaptability: Eagerness to learn new technologies and adapt to evolving business requirements and market conditions.\nQuality Focus: Commitment to writing clean, well-documented, and thoroughly tested code.\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 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