Top C# Jobs

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

Develop and optimize core infrastructure for autonomous driving. Focus on low-latency execution, component health monitoring, and system performance improvements.

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.

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.

Looking for mid to senior level .NET/C# developers with SharePoint experience to enhance customer experience through new functionality. Candidates will document business requirements and develop application design documentation.

Design, develop, and maintain C++ client/server applications and web services on Win32. Implement object-oriented, multithreaded, TCP/IP networking solutions, collaborate with business analysts, QA, product management and end users, and follow agile practices to integrate testing and support.

Design, develop, test, and support C++ software solutions. Own end-to-end features, create technical designs and documentation, estimate work, lead onshore/offshore developers and QA, and troubleshoot complex hardware/software systems.

Design, build, test, and support web and client-server applications; lead custom SharePoint intranet development; implement front-end features using C#/.NET and JavaScript frameworks; optimize performance and scalability; produce technical specifications, documentation, QA, and user training; maintain .NET certifications.

Maintain and enhance the QLS-VO app server codebase using C and Pro*C. Develop TCP/IP socket code, write Oracle queries, compile on Linux, and perform testing and troubleshooting. Support Pro*C compilation and relational DB / Cron understanding.

Develop and support applications using C# and .NET, provide production support, and troubleshoot issues in a fast-paced environment.

The role involves developing and enhancing trade and position management infrastructure, building interfaces, and participating in trade processing.

The role involves developing server-side C# applications for trading systems, particularly focusing on risk management and derivatives market data.

Lead design and global rollout of a high-performance core market data and execution platform. Implement and optimize low-latency market data ingestion, normalization, distribution, and execution components in modern C++. Own deployment, monitoring, profiling, and production optimization while collaborating closely with quants and technical traders to enable systematic pricing and trading strategies.

Lead design and global rollout of a high-performance market data and execution Core Platform. Build low-latency ingestion, normalization, distribution, and execution components. Develop tools for quants and traders, own lifecycle from deploy to production profiling and optimization, and collaborate closely with engineers, quants, and traders to iterate on requirements and platform improvements.

Lead development of high-performance C++ trading systems and core platform components, build and optimize exchange connectivity (market data and order flow), implement trading algorithms, improve stability and observability, troubleshoot production issues, and collaborate closely with quants and traders to iterate on design and deployment.

Build and optimize low-latency C++ trading systems used across global venues. Implement exchange connectivity, trading algorithms, testing, monitoring, and performance optimizations. Collaborate with researchers, traders, and engineers to refine requirements, troubleshoot production issues, and deploy reliable, high-performance trading platform components.

Design, implement, and optimize foundational CUDA C++ libraries, parallel algorithms, utilities, and runtime abstractions. Own features across design, implementation, testing, profiling, benchmarking, documentation, and maintenance. Collaborate with compiler, Python, and Rust teams, engage with users on performance and correctness, and improve developer productivity through diagnostics, tooling, and CI integration.

Design, develop, and deploy ground control and onboard communications software for UAV platforms while working in Agile teams.

The role requires developing inspection software for mask inspection systems, requiring strong C++ knowledge and collaboration with multidisciplinary teams.

As a Senior Software Engineer in the HFT team, you will lead technical projects, develop automated trading strategies, maintain trading infrastructure, and collaborate with researchers.

Design, develop, and maintain SpaceX's in-house test infrastructure and supporting applications for production, integration, and simulation testing. Improve reliability, performance, and safety of test software; collaborate with flight software teams; own product development for test tooling and integrate AI-driven developer tooling.

Full-stack C#/.NET developer responsible for maintaining and enhancing application code, building JavaScript UIs, working with SQL Server (PostgreSQL a plus), and collaborating with remote and internal teams. Requires strong organizational, analytical, and communication skills and willingness to learn new tools and environments.

Architect, design, and develop the company's proprietary software, maintenance systems, BSOL, and web services. Create development proposals and plans, resolve defects, implement enhancements, support customers and compliance, assist offshore development planning and sales support, and report to the Director of Software Engineering.