Top Senior C# Jobs

The Staff Software Engineer will develop high-throughput logging frameworks for self-driving vehicles, ensuring efficient data collection and offloading while collaborating with various teams to optimize system performance.

Develop and maintain a high-performance image processing system, optimizing algorithms for efficiency, and collaborating with hardware engineers for seamless integration.

Design and implement high-performance C++ backend systems for defense autonomy products (Axion and Acuity). Build scalable, reliable infrastructure for contested and degraded conditions, partner with researchers and customers to translate mission needs into software, and own architecture through deployment. Contribute to site buildout and interface with DoD programs.

Senior individual-contributor C++ engineer to design, implement, and maintain high-performance, multithreaded C++ applications across multiple product codebases. Work includes server-side services, device integration, signal-processing components, GUI maintenance, CI/CD (GitLab/Docker/Make), automated testing (gtest), and collaboration with Python/React teams. Must be U.S. citizen able to obtain Top Secret clearance and use AI-assisted development tools as part of the workflow.

Design, develop, test, and maintain scalable C#/.NET applications and RESTful APIs. Build data-driven platforms, implement CI/CD and DevOps practices, deploy containerized apps (Docker/Kubernetes) on AWS, troubleshoot production issues, and collaborate on architecture, code reviews, and observability improvements.

Senior .NET engineer responsible for designing and building scalable SaaS backend systems using C#, .NET Core, Web API, and Entity Framework. Tasks include building RESTful APIs and microservices, SQL Server schema and performance tuning, applying DDD/CQRS patterns, owning testing (unit/integration/performance) in a shift-left model, and leveraging AI coding assistants while collaborating with product and cross-functional squads.

Develop, implement, and support store systems using CBasic on the IBM 4690 retail platform. Troubleshoot, resolve issues, and work with cross-functional teams. Prioritize tasks, meet SLAs, and communicate effectively. Potential contract-to-hire engagement with Genpact in Woonsocket, RI.

Senior C++ Developer to design, develop, and support large distributed C++ applications on Unix/Linux. Responsibilities include SQL integration, algorithm and OOP design, debugging, and delivering production-ready software for long-term projects.

Designs and develops complex applications, authors technical specs, mentors junior developers, implements UI and backend code, unit tests and debugs, ensures quality/security/compliance, and produces technical documentation.

Develop XAML-based front-end components and prototypes using Expression Blend and Visual Studio. Build reusable WPF controls following MVVM and coding standards, produce production-ready XAML working with C#, create interactive high-fidelity prototypes, fix bugs, and refine UI fit-and-finish.

Develop and maintain front-, middle- and back-office platforms for investment banks, including trade capture systems and real-time multithreaded risk portals. Participate in full software development lifecycle, design system components, write and test C/C++ code on UNIX, work with relational databases, and communicate technical solutions to non-technical stakeholders.

Senior mobile engineer to develop and maintain multi-platform mobile applications using C#, Objective-C and Java. Responsibilities include designing and testing Android APIs, applying Java design patterns, optimizing multithreading, networking and algorithms, and collaborating with QA to diagnose and fix bugs across Android, iOS and legacy/mobile OS platforms.

Seeking a Senior iOS Developer to design and build high-performance iOS applications. Requires 5+ years in iOS development with Swift and Objective-C, experience with REST services, and skills in data persistence frameworks. Occasional travel may be needed.

Lead full‑stack development of web applications using C#, ASP.NET (Web Forms or MVC), HTML, CSS, and JavaScript libraries. Code, test, integrate, and document solutions; mentor teams; design complex systems; work with databases (preferred MongoDB) and deploy to web servers (preferred IIS).

Develop and maintain EDA tools for transistor-level analysis. Enhance architecture for timing analysis and implement machine learning technologies for improved solutions.

Seeking a Senior Software Engineer skilled in C++, algorithm optimization, and multi-agent systems to develop autonomous decision-making frameworks for mission-critical applications.

Seeking a Senior C++ Software Engineer to design algorithms for multi-agent systems, focusing on optimization, real-time decision-making, and autonomy. Collaborate with teams and translate complex concepts into production systems.

Develop and implement customer-facing .NET applications. Work with the Customer Solutions lead to design ASP.NET GUIs, prototype rich user interfaces, program in C# (.NET 4.5), and perform SQL Server development and database programming.

Design, develop and maintain Windows-based application platforms and SDKs for wearable devices. Collaborate with product, design, test, and global teams to implement new features, support existing code, write unit tests, and follow Agile development and SDLC best practices.

Lead development of software for an automated parking platform, focusing on multi-agent motion planning, fleet coordination, real-time embedded systems, simulation, integration, and deployment. Build scalable, fault-tolerant C++/ROS2 software, validate via large-scale simulation and live pilots, and collaborate across disciplines to deliver reliable production robotic systems.

Lead maintenance and expansion of a flagship Windows client-server accounting product. Design, implement, test, and document features; maintain large legacy C++ codebase while developing in C#/.NET. Collaborate with cross-functional teams, gather user requirements, optimize databases, ensure code quality, and apply finance domain knowledge to deliver reliable accounting software.

Design, build, deploy, and operate C++ gRPC backend services for a CAD/CAM web product. Integrate CAM/CAD libraries, apply DevOps/SRE practices (CI/CD, observability, IaC), set engineering standards, mentor teammates, and ship fast in an early-stage environment.

Senior game developer to design and build online gaming products using C++, OpenGL/OpenGL ES and XNA. Requires graphics and OOP fundamentals, cross-platform development, SDLC experience, project management and client-facing skills. US work authorization and willingness to relocate to CA required. Contract (Corp-to-Corp).

Design, develop, test, document, and implement C#/.NET applications per technical specifications. Interpret business requirements, produce architectural and technical documentation, create unit test plans and harnesses, estimate tasks, validate accessibility and secure coding, and collaborate with infrastructure/network/server teams to resolve application issues.

Senior C# Developer for a 6+ month project in Plano, TX. Must have strong C# expertise, basic SQL/Sybase experience, and preferably Windows Mobile 6.5 mobility experience.