Top C# Jobs in Seattle, WA

Design, develop, and field high-performance Ground Control Station and C2 software using C++/Qt/QML and QGroundControl. Lead architecture and technical direction, mentor engineers, define APIs/ICDs, debug integration/latency issues, support field tests, implement post-mission debrief tools, and ensure interoperability with C2 standards.

As a Backend Engineer, you'll improve Git and Gitaly by contributing features, bug fixes, and performance improvements, collaborating with the open source community, and participating in architectural discussions.

Seeking an experienced AngularJS and C# developer to create a data dashboarding site with reusable MVC code and templating frameworks.

The role involves developing a data dashboarding site using AngularJS, D3, and C#, focusing on creating reusable client-side MVC code with templating frameworks.

As a Software Engineer for Starlink, you will develop and support real-time software for satellites and gateways, enhancing broadband access globally.

Develop and maintain C# applications using ASP.NET and Blazor, build and integrate REST APIs, design Azure Storage solutions, collaborate with offshore teams, apply AI concepts, and continuously learn new technologies. Coordinate development activities and ensure effective communication across teams.

Looking for an SQL and C# developer with 6 years of software development experience, proficient in T SQL programming and development, and strong in C#.

The role involves software development with a focus on T SQL programming and development using SQL Server and C#.

The role involves developing Power BI reports, dashboards, and visualizations, working with T-SQL and SSAS, and requires extensive experience in C# and ASP.Net.

Design, implement, and operate core networking software for a large-scale GPU datacenter fabric. Develop routing and traffic-engineering algorithms, real-time switch software, prototypes and experiments, deployment and CI tooling, monitoring, and testing to maximize performance and reliability of AI training infrastructure.

The C# ETL Azure Developer will work in agile environments to develop high-performance C# libraries for Azure Data Factory, ensuring strong standards, scalability, and troubleshooting capabilities. Candidates should have strong SQL and object-oriented design skills, as well as experience with Azure cloud development.

As a Senior Software Engineer - C++ GPU Performance, you will optimize GPU algorithms, monitor performance metrics, and influence design decisions for self-driving technology.

The role involves optimizing GPU-based algorithms, developing benchmarking frameworks, analyzing performance metrics, and facilitating efficient code development for autonomous vehicle systems.

As a Senior Software Engineer, you will design, build, and maintain scalable distributed systems, engage in cross-functional collaboration, mentor engineers, and improve processes throughout the software lifecycle.

Design high-performance C++ libraries for automated PCB design challenges, mentoring peers and shaping technical direction while collaborating with experts in various fields.

As a Staff Software Engineer, you will lead technical strategies, develop APIs and microservices, and mentor engineers for innovation at GEICO.

Design and maintain high-speed GPU-based simulation platform ensuring deterministic execution, low latency, and reproducibility at scale. Own interfaces to the self-driving stack, optimize performance, and build self-serve systems to accelerate ML and autonomy workflows while collaborating with ML experts to bridge fidelity gaps.

Design and evaluate performance engineering tasks for AI training/evaluation. Optimize runtime, compilers, memory, CPU/GPU and concurrency. Produce documented solutions, evaluate AI-generated code, and build evaluation frameworks and scoring rubrics while collaborating with researchers and SMEs.

The C# / .NET Developer will design and maintain middleware applications, build Shopify integrations, and support a mobile app backend in a remote work environment.

Build and maintain scalable, cloud-native APIs using .NET. Enhance core platform components, lead architecture and testing discussions, optimize telemetry and performance, collaborate cross-functionally, conduct code reviews, and mentor team members.

You will develop and maintain components of the LLVM based toolchain, collaborating with the community while ensuring platform-specific optimizations and tests.

Develop user interface components for ArcGIS Pro using C# and WPF, work in an agile team, and design software solutions for raster and imagery processing.

PrivateID seeks a Principal C++ Engineer with at least 10 years of experience to lead complex systems and scale their platform in a remote-first environment.

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.

Remote backend C# developer to build and optimize a high-load spot-exchange matching engine. Improve performance and API throughput, implement business features, write unit and integration tests, work with .NET Core and PostgreSQL on AWS, and apply multithreading, async, and distributed systems concepts.