Top Senior C# Jobs

Design, develop, integrate, test, and support real-time, mission-critical C++ software for Gatik's autonomous vehicle stack. Collaborate with research engineers to produce maintainable, testable designs; architect solutions across a large software stack; ensure SDLC and safety best practices; mentor researchers on performance and resource use; and participate in code/design reviews and deployment with DevOps teams.

Design and implement ultra-low-latency C++ trading gateway components, build market access interfaces (FIX/OUCH), optimize NUMA-aware multithreaded systems, employ userspace networking, lock-free techniques, and compiler/cache optimizations, and lead related projects.

Design and implement low-latency C++ gateway infrastructure for market access. Build and optimize order-entry interfaces (e.g., FIX, OUCH), apply NUMA-aware multithreading, userspace networking, compiler/cache optimizations, and lock-free techniques. Contribute to architecture and performance tuning using strong algorithms, data structures, and modern C++ best practices.

The Full Stack Developer will design and develop cloud-native applications and microservices using C# and .NET technologies, ensuring high performance and adherence to agile practices while integrating various databases and data sources.

The Application Software Engineer will focus on integrating AI technology for autonomous driving, ensuring software functionality on hardware platforms, and collaborating across teams for smooth delivery.

Design and develop key components of Stellar Core while collaborating with team members. Engage in performance optimization and ensure the system's scalability and security.

As a Senior Software Engineer, you will design and develop key components of Stellar Core, enhance blockchain technology, and collaborate with engineering teams.

Seeking a Senior Principal C++ Software Engineer to enhance FPGA prototyping products, focusing on timing algorithms and performance improvements.

Lead design and development of high-performance backend infrastructure using modern C++ (and optionally C# or Java). Architect scalable, low-latency distributed systems and microservices across Linux and Windows, optimize performance and memory, implement multithreaded processing, integrate databases and messaging systems, mentor engineers, and drive code quality and CI/CD best practices.

Design and implement C/C++ software and OS-level environment for the Palladium emulation platform. Write feature and test specifications, implement unit/integration/system tests, collaborate across teams, and optimize algorithms and performance. Work may include Linux/kernel drivers, multithreading, and TCP/IP networking.

Develop and maintain high-performance C++ machine control and data analysis software for advanced mask inspection systems. Integrate AI/ML capabilities, collaborate with multidisciplinary engineering teams, optimize and scale existing code, and support integration/testing and customer escalations. Work with APIs, containers, and observability tools to enable reliable production deployment.

Refactor and develop complex C++20 software to be platform-independent and containerized (Docker). Perform systems modeling, simulation, analysis, collaborate with hardware engineers, document software, and potentially lead junior staff. Work onsite supporting a federal customer at Redstone Arsenal; must be US citizen able to obtain security clearance.

Develop and optimize ultra-low-latency, high-performance trading infrastructure in modern C++. Implement and tune order execution, market data connectivity, multi-threaded systems, and risk modules. Profile and benchmark real-time systems, collaborate with quants and traders, and maintain robust, fault-tolerant continuous trading operations.

Develop and enhance 3D analytic capabilities for ArcGIS Pro using C++. Responsibilities include building components, managing large datasets, and applying algorithms.

Maintain and enhance production C++ codebases on Linux, develop targeted greenfield features, support releases and production debugging, collaborate with systems/test/field/manufacturing teams to resolve integration issues, and improve technical documentation to ensure system reliability and knowledge continuity.

Design, implement, and maintain C++ software for safety-critical missile and weapon systems on VxWorks RTOS. Perform hardware-software integration, lead verification and validation, collaborate with multidisciplinary teams, and maintain rigorous technical documentation to meet defense safety requirements.

Design, develop, and maintain web applications using C#, .NET, AngularJS, TypeScript and Node.js. Collaborate with customers and team to define requirements, ensure performance and quality, fix bugs, participate in code reviews, and maintain code quality within an Agile environment.

Design and develop scalable services/APIs using C#/.NET/.NET Core, collaborate during SDLC, mentor junior engineers, and ensure code quality.

Maintain, enhance, and modernize enterprise VB.NET Windows Forms applications; develop and support related C# services, SQL Server databases, and REST integrations; participate in Agile/Scrum, code reviews, troubleshooting, documentation, and technical guidance to ensure stability and maintainability.

Lead design and delivery of complex backend features for a high-scale online banking platform. Own code from design to production, modernize legacy systems, develop microservices, design APIs, implement tests, ensure secure coding, use AI-assisted tools, troubleshoot issues, and document APIs while collaborating with product, QA, and front-end teams.

Lead design and implementation of a low-latency C++ trading platform covering execution, market data, order and risk management. Build direct exchange connectivity, optimize microsecond/nanosecond performance, collaborate with traders and quants, and own systems end-to-end in production trading environments.

Develop, own, and maintain desktop Agent Desktop features using C#, .NET, and WPF. Integrate with backend REST/SOAP APIs, write unit and integration tests, troubleshoot UI and service issues, participate in code reviews and Agile ceremonies, and contribute to CI/CD and reliability improvements.

Design, build, and maintain scalable .NET/C# full-stack applications and integrations for Private Wealth. Collaborate with business partners, participate in SDLC, address production issues, lead design reviews, optimize platforms, and mentor junior developers while using Agile practices and AI-assisted development tools.

Design, build, and maintain large-scale, distributed API-driven systems using C#/.NET and SQL. Integrate AI (LLMs, agents, prompt engineering) to improve customer experience, observability, automation, and data quality. Lead design, code reviews, telemetry-driven diagnostics, and collaborate with Product, Research, and Data teams to deliver AI-powered platform capabilities.

Develop and maintain high-performance, scalable system software and libraries for web/payment platforms. Build multi-threaded C++ servers, ensure HTTP protocol correctness, collaborate with distributed teams, perform code reviews, mentor engineers, and use Python for tooling or automation.