Top Senior C# Jobs

Develop and support full-stack web applications for Source-to-Pay business processes. Responsibilities include designing .NET solutions, developing front-end and back-end functionality, integrating RESTful services and databases, troubleshooting production issues, testing, documenting, supporting users, participating in architecture and code reviews, and mentoring junior developers. The role requires collaboration with business stakeholders and ownership of development projects.

Designs and builds scalable, resilient distributed systems and applications using .NET, C#, microservices, REST APIs, cloud platforms, containers, and DevOps practices. Responsibilities include architecture, coding, code reviews, reusable components, monitoring, continuous delivery, infrastructure as code, cross-functional collaboration, mentoring engineers, and improving engineering processes.

Develop high-performance C++ services and libraries on Linux for real-time systems integrating AI, hardware interfaces, and sensor data. Optimize CPU, memory, I/O, concurrency, and build performance; debug multithreaded issues; write tests; apply sanitizers and static analysis; and contribute to CI pipelines and developer tooling.

Develop and optimize low-latency C++ software on Linux for IBCS sensor integration and composite track processing. Implement RTI DDS middleware, process and correlate sensor and radar data, support Combat Identification logic, and integrate software with hardware interfaces and battle-management nodes. Collaborate in SAFe/Scrum environments using Jira and Confluence while troubleshooting concurrency, serialization, and network-latency issues.

Develop and optimize high-throughput C++ algorithms for remote sensor data exploitation, image analysis, detection, and tracking. Design software architectures, contribute to Agile teams and shared tools, and work with databases and Linux systems. The role requires strong object-oriented programming, data structures, concurrency, and performance optimization skills.

Develop and maintain .NET and C# web applications using MVC and IIS on Windows Server. Perform software testing, SQL stored procedure development, SDLC activities, defect tracking, technical documentation, and mentoring of junior personnel. Requires an active TS/SCI clearance with CI polygraph and eligibility for additional clearances.

Develop and maintain high-fidelity, real-time C++ simulation software for SpaceX flight systems and vehicles. Build simulation infrastructure and physics models, prototype designs, improve performance and reliability, and collaborate with engineering teams and simulation users to deliver new capabilities. The role requires strong software development, debugging, optimization, testing, distributed systems, networking, memory management, and physics knowledge.

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

Develop and maintain scalable enterprise web applications using React, JavaScript or TypeScript, C#, and .NET. Build responsive interfaces, backend services, REST APIs, and microservice integrations. Design Azure cloud solutions, support CI/CD deployments, participate in architecture and code reviews, troubleshoot applications, and collaborate with stakeholders, QA, product owners, and developers in an Agile/Scrum environment.

Design, build, and maintain Stellar Core, the distributed system powering the Stellar blockchain. Responsibilities include developing scalable network components, improving peer-to-peer and processing performance, strengthening resilience and decentralization, investigating bottlenecks, authoring protocol specifications, and contributing to architecture, code reviews, and open-source engineering practices.

Design, build, and maintain Stellar Core, the distributed system powering the Stellar blockchain ledger and consensus. Develop scalable, resilient components; improve peer-to-peer networking and processing performance; investigate bottlenecks; and contribute to architecture, code reviews, RFCs, formal verification, simulations, and open-source collaboration. The role requires production C++ or Rust expertise, strong software design skills, and ownership of core subsystems.

Develop and sustain a high-performance geospatial collaboration and intelligence reporting tool. Responsibilities include implementing mission-driven enhancements, maintaining existing code, troubleshooting application interfaces, testing, integration, and resolving production issues. The developer will work with Java, C/C++, scripting languages, databases, search platforms, REST services, and Linux. Participation in a rotating pager schedule is required for emergency 24/7 support.

Develops, implements, maintains, and supports MES software and infrastructure in a manufacturing environment. Responsibilities include C# and ASP.NET development, MES integrations, shop monitoring applications, reporting, hardware and software installation, network and system maintenance, troubleshooting, documentation, user training, and production stability. The role also designs and manages scalable Kubernetes clusters and automation scripts for provisioning and administration.

Lead technical design and deliver secure, scalable C#/.NET software for trading systems. Drive architecture, coding, code review, automation, resiliency, CI/CD, and adoption of AI-assisted engineering practices while mentoring teams and engaging vendors.

Design, develop, integrate, test, deploy, and maintain high-performance DNS resolution software in a collaborative Agile environment. The role involves systems programming in C, C++, or Rust; networking and routing protocols; automated testing; CI/CD; infrastructure automation; vulnerability management; troubleshooting; and Linux-based distributed system operations. Engineers own features from design through delivery, contribute to technical leadership and best practices, and collaborate closely with team members.

Design, develop, and support reusable components, interactions, frameworks and SDKs for Spectacles AR glasses and SnapOS. Contribute to OS components, participate in code and design reviews, and collaborate with design, engineering, and product teams to launch performant, test-covered features.

Develops and maintains control-plane software for Layer 2 networking and switching systems. Responsibilities include requirements analysis, software design, C/C++ implementation, unit and integration testing, test automation, performance optimization, troubleshooting, root-cause analysis, and collaboration with architects and distributed teams. The role also contributes to technical specifications, customer issue resolution, standards, white papers, and patents.

Develop and optimize a Windows desktop application featuring geospatial rendering, GIS visualization, and hydraulic model editing. Responsibilities include maintaining the rendering engine, implementing 2D/3D DirectX pipelines, developing computational geometry algorithms, integrating geospatial formats and coordinate systems, testing, documentation, code reviews, and mentoring junior engineers. The role collaborates with technical subject-matter experts to enhance the platform and support water resources engineering applications.

Develop and optimize high-performance C++ numerical simulations for hydrology and water resources applications. Maintain and enhance Windows desktop software and cloud-based SaaS products, addressing computational efficiency, numerical stability, and large-scale data challenges. Collaborate with water resource engineers to translate scientific concepts into software, while contributing to architecture, code reviews, documentation, unit testing, debugging, and continuous improvement.

Design and develop C/C++ software for complex distributed and high-performance computing systems. Build multithreaded and multiprocess applications on Linux, use Python scripting, work with networking stacks, and troubleshoot HPC systems. Preferred experience includes cloud infrastructure, containerization, Linux kernel configuration, network infrastructure, device drivers, and real-time systems. The role requires strong problem-solving and communication skills.

Design and implement high-performance GPU-accelerated software using C++ and CUDA. Develop CUDA kernels for signal and image processing, profile and optimize GPU applications, integrate with hardware (FPGAs, SoCs), collaborate with cross-functional teams, and apply DevSecOps/CI-CD practices to deliver production-quality defense systems.

Design, own, and optimize low-latency trading infrastructure supporting real-time data processing, order execution, market data, and strategy implementation. Build fault-tolerant systems, execution logic, venue gateways, test harnesses, and data-analysis pipelines. Partner with quantitative researchers and traders while making architectural decisions, applying modern C++ practices, and supporting systems from design through production. The role requires onsite collaboration four days per week.

Build and integrate cloud-based backend microservices for multiplayer games. Develop scalable services, networked features, and live game functionality; integrate platform and console services; support certification; troubleshoot PC and console issues; collaborate with designers, partner studios, and external programmers; and create maintainable software and design documentation.

Develop C and C++ applications for Linux, Unix, and Windows environments, including real-time embedded systems. Install and support hardware, servers, and rack components while working with x86 and ARM processors. Apply object-oriented development principles, meet project timelines, produce high-quality software, document work, communicate effectively, and collaborate with peers in a changing environment.

Design and develop low-latency, high-throughput distributed database kernels for massively parallel analytics. Responsibilities include query execution, columnar storage, transaction management, cluster coordination, hardware-aware optimization, SIMD vectorization, RDMA networking, in-database machine learning, vector indexing, performance tuning, architecture reviews, code reviews, mentoring, and resolving scalability issues.