Discover your future at CitiWorking at Citi is far more than just a job. A career with us means joining a team of approximately 219,000 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.Job OverviewDepartment OverviewThe 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.Role SummaryWe are seeking an exceptional Senior Software Engineer with deep expertise in Rust and C++ to join our Equities Low-Latency Trading Technology team.In 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.Key Responsibilities1. System Design & DevelopmentArchitect, build, and maintain ultra-low-latency trading systems, including exchange connectivity gateways, market data feeds, and algorithmic execution engines using Rust and C++Design clean, modular, and reusable APIs and libraries that can be leveraged across multiple trading desks.Lead the strategic migration of critical trading components from C++ to Rust, leveraging Rust's memory safety and concurrency guarantees without sacrificing performance.2. Performance OptimizationProfile and optimize systems to achieve sub-microsecond latencies and deterministic performance.Apply low-latency techniques such as CPU pinning, cache-friendly data structures, lock-free programming, memory-mapped files, and custom memory allocators.Utilize kernel bypass technologies (e.G., Solarflare OpenOnload,



DPDK, EF_VI) to minimize network stack overhead.3. Concurrency & ReliabilityDesign and implement highly concurrent, thread-safe, and lock-free algorithms to handle massive throughput with minimal jitter.Implement rigorous testing methodologies, including unit testing, integration testing, property-based testing (in Rust), and high-fidelity simulation/back testing environments.Ensure the high availability and operational resilience of trading systems through robust error handling and failover mechanisms.4. Collaboration & SupportWork closely with quantitative researchers, traders, and product managers to translate complex trading strategies and business requirements into robust, production-ready software.Build real-time telemetry, monitoring, and alerting tools to ensure operational visibility.Provide level-3 escalation support for production systems during market hours.Required Technical Skills & QualificationsProgramming LanguagesC++: 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).Rust: Strong proficiency in Rust, including ownership/borrowing concepts, lifetimes, unsafe Rust boundaries, macro systems, and the Cargo ecosystem.Systems Programming & Low-LatencyDeep understanding of Linux operating system internals (kernel tuning, memory management, virtual memory, page faults, system calls).Experience with low-latency networking (TCP/IP, UDP, Multicast) and socket programming.Familiarity with hardware-level concepts: CPU cache hierarchies (L1/L2/L3), TLB, branch prediction, and memory barriers.ConcurrencyProven experience in multi-threaded programming, memory models (sequential consistency, acquire-release), and lock-free data structures.Equities Domain KnowledgeSolid understanding of Equities market structure, order types, exchange protocols (FIX, OUCH, ITCH),



and trading lifecycles.Tools & InfrastructureExperience with profiling and debugging tools (gdb, valgrind, perf, VTune, heaptrack).Proficiency with build systems (CMake, Cargo) and CI/CD pipelines (Git, Jenkins/GitHub Actions).Preferred QualificationsExperience with FPGA integration or hardware acceleration.Experience with kernel bypass technologies (Solarflare EF_VI, OpenOnload, DPDK).Knowledge of market-making, smart order routing (SOR), or statistical arbitrage execution strategies.Bachelor’s or Master’s degree in Computer Science, Computer Engineering, or a related quantitative field.Core CompetenciesAnalytical Thinking: Solid problem-solving skills with the ability to analyze complex systems and identify performance bottlenecks.Collaboration: Excellent communication skills with the ability to work effectively in a fast-paced, cross-functional team environment.Adaptability: Eagerness to learn new technologies and adapt to evolving business requirements and market conditions.Quality Focus: Commitment to writing clean, well-documented, and thoroughly tested code.------------------------------------------------------Job Family Group: Technology------------------------------------------------------Job Family:Applications Development------------------------------------------------------Time Type:Full time------------------------------------------------------Most Relevant Skills Please see the requirements listed above.------------------------------------------------------Other Relevant Skills For complementary skills, please see above and/or contact the recruiter.------------------------------------------------------Citi 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.If 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 (opens in new window).View Citi’s EEO Policy Statement (opens in new window) and the Know Your Rights (opens in new window) poster.

📌 Senior Software Engineer – Equities Low-Latency Technology (Rust / C++) (Pune)
🏢 Citigroup
📍 Pune