Top Senior C# Jobs

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.

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.

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 and implement high-performance C++ system software that interfaces with GPUs and hardware, integrate AI frameworks across platforms, contribute to build systems and toolchains, collaborate with cross-functional teams, and grow into architecture and leadership roles.

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.

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.

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

Develop and maintain bioinformatics software systems, collaborate with scientists, and implement efficient algorithms for data processing.

The Senior Software Engineer will analyze, design, and develop programming systems, interact with business users, and ensure software quality through testing and debugging.

Responsible for analyzing, designing, and developing programming systems, addressing user requirements, debugging, and unit testing programs while maintaining legacy code.

Develop capabilities for the VCS21 Management Subsystem by implementing features, maintaining unit tests, fixing defects, and participating in reviews.

Seeking a C++ Engineer for production support with experience in troubleshooting production software, strong scripting skills, and understanding of SQL and OOP.

The role involves developing computational models in C++. The candidate will collaborate with product owners and analysts and write unit tests, focusing on performance and design principles.

The role involves developing Intranet Web applications using C# and .Net, overseeing system testing, and creating technical documentation.

Develop and maintain client/server programs, refine specs, manage development activities, enhance UI/UX, assist in support and migration processes.

The role involves using C++ for software development focusing on object-oriented principles, with projects on Linux and Windows operating systems. It requires strong debugging and testing skills, along with adaptability to new technologies.

The C++ Developer will engage in software development focusing heavily on C++ and object-oriented programming, primarily for Linux and Windows systems.