Top C# Jobs

Software Engineers at Citadel develop software solutions for trading platforms, optimizing performance and functionality, and support trading activities.

Design and develop low latency, high-performance trading systems. Optimize code and solutions for hardware efficiency, ensuring seamless application integration.

Lead development of core client systems and engine-level infrastructure in Unity/C#. Diagnose and fix cross-cutting performance issues, upgrade third-party SDKs, evolve build tooling, produce design docs, scope multi-week infrastructure initiatives, mentor engineers, and drive profiling, optimization, and architecture changes to enable future features.

As a Software Development Engineer, you will create high-performance Linux software components, ensure system reliability, collaborate with teams, and design security features for containers in cloud environments.

Design, develop, and integrate software solutions; analyze system requirements and customize applications; assist with releases; mentor junior engineers; collaborate with QA; troubleshoot complex issues; conduct user training; provide technical leadership on routine projects.

The Market Data Engineer will design and implement high-performance market data systems, focusing on trading infrastructure, performance optimization, and system resiliency.

Design, develop, and own high-performance C++ cloud-based ad-serving and distributed systems. Mentor junior engineers, collaborate with stakeholders, optimize algorithms, deploy and maintain Linux-based services, use Snowflake and Aerospike, review code, and improve system reliability and scalability.

Design, implement, and optimize high-concurrency, low-latency ad-delivery systems. Architect and maintain AWS-based, containerized (Kubernetes) infrastructure, mentor engineers, produce technical documentation, and support production reliability and scalability.

Lead design, development, testing, documentation, and rollout of software and web applications. Mentor and train junior engineers, provide technical leadership, collaborate with stakeholders, evaluate performance metrics, and ensure timely delivery within budget.

The Staff Software Development Engineer will enhance core systems, collaborate with engineering teams, define software specifications, and mentor junior engineers.

The role involves building and supporting production-level trading systems in C++ for credit and rates products, collaborating with traders and quantitative researchers.

FreeWheel seeks a C++ Engineer to design, build, and support its video advertising platform, responsible for the software development lifecycle and collaborating with project stakeholders.

Implement and integrate mortgage prepayment models into the firm's C++ analytics library. Deliver production-grade, performant, modular code with comprehensive unit/integration tests, API integration, versioning, and documentation. Collaborate with quants, model validation, business, and technology teams to ensure backward compatibility and operational readiness.

Implement mortgage prepayment models in production-grade C++ within the firms analytics library. Ensure performance, API integration, tests, versioning, documentation, and collaboration with business, model development, validation, and technology teams.

The Senior Software Engineer develops and maintains Sports Trading applications using .NET and SQL Server, enhancing existing functions and providing technical guidance.

Develop and maintain custom options valuation and risk-management systems. Collaborate with traders, risk managers, and quants to gather requirements, design solutions, implement high-performance code, troubleshoot issues, document models and tests, and improve scalability, accuracy, and performance of pricing systems.

Software Engineers at Citadel develop, maintain, and support high-performance trading platforms, focusing on custom software solutions and system stability.

As a C++ Software Engineer, you will optimize performance for latency-critical systems, collaborate with traders and quants, and ensure code correctness in a fast-paced environment.

Lead design and implementation of high-performance GPU-accelerated software using C++ and CUDA. Develop and optimize CUDA kernels for signal and image processing, integrate GPU components with systems, and collaborate with hardware, signal processing, and systems teams. Apply DevSecOps/CI-CD practices, profile/optimize performance, and develop software interfacing with FPGAs, GPUs, and embedded SoCs for defense systems.

As a Full Stack Engineer, you'll develop online services features using C#, React, and ensure best practices in software development. Collaboration with global teams is key.

Lead architecture and implementation of high-performance C++ and Python systems, integrate distributed systems and hardware/software, manage CI/CD pipelines, debug and optimize real-time multi-threaded systems, guide end-to-end integration and verification, mentor engineers, and evaluate new technologies to improve system performance.

Design, implement, and maintain C++ and Python software for cross-platform, distributed real-time systems. Contribute to system architecture, APIs/messaging (gRPC/REST/ZeroMQ), CI/CD, automated testing, and integration of third-party simulation and hardware. Debug threading/timing issues and improve development workflows.

Lead architecture and implementation of high-performance C++ and Python systems, integrate distributed systems and simulation tools, own CI/CD pipelines, debug real-time multi-threaded systems, mentor engineers, and drive end-to-end integration across simulation and operational platforms.

Design, implement, and maintain C++ and Python software for cross-platform, distributed real-time systems. Integrate third-party software/hardware and simulation tools, develop APIs/messaging (gRPC/REST/ZeroMQ), debug threading/timing issues, and improve CI/CD pipelines with Docker, CMake, Conan, and GitLab CI while practicing test-driven development and collaboration.

Lead architecture and implementation of high-performance C++ and Python systems, integrate distributed and real-time systems, own CI/CD and build tooling, debug multi-threaded systems, guide cross-team integration and mentor engineers, and evaluate new technologies to improve simulation and autonomy platforms.