Top C# Jobs in NYC, NY

Lead design, build, test, and maintain a high-performance, highly available distributed online video ad server. Produce technical specifications, write efficient C/C++ code, ensure quality assurance, mentor engineers, and collaborate with product and global teams to deliver scalable, mission-critical features.

Software Engineers at Citadel develop software solutions for trading platforms, optimizing performance and functionality, and support trading activities.

Design, implement, test, and deploy high-performance C++ APIs exposing a mortgage analytics quantitative library for interest rate modeling, prepayment/default analysis, derivative valuation, hedging, and forecasting. Improve performance, reliability, and usability of the library and collaborate with business, model development, validation, and IT teams.

As a Full Stack Engineer, you'll develop online services features using C#, React, and ensure best practices in software development. Collaboration with global teams is key.

Design and develop low latency, high-performance trading systems. Optimize code and solutions for hardware efficiency, ensuring seamless application integration.

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

The role involves building and supporting production-level trading systems in C++ for credit and rates products, collaborating with traders and quantitative researchers.

Develop scalable server-side features, online services, and collaborate with teams. Requires C#, .NET expertise and experience in distributed systems.

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, 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.

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 scalable .NET/C# full-stack applications and integrations for Private Wealth. Collaborate with business partners, participate in SDLC, address production issues, lead design reviews, optimize platforms, and mentor junior developers while using Agile practices and AI-assisted development tools.

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 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.

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.

The C++ Quant Developer will work on fixed income electronic trading systems, focusing on software performance, automated quoting, execution, and risk management.

Seeking a senior C/C++ developer with financial experience to design and implement features for a derivative pricing platform. Responsibilities include project management, bug fixing, and communication with product managers.

Seeking a C++ Developer with at least 3 years of experience in software development, strong database skills, and knowledge of data structures and algorithms.

The role involves software development utilizing C/C++, with a focus on data structures, algorithms, and database management. It values communication and analytical skills, as well as experience throughout the software development lifecycle.

The C++ Developer will work on software development, enhance mission-critical software, and manage requirements through the full development lifecycle.

Develop low latency algorithmic trading strategies, enhancing systems for market data and order execution while collaborating with investment professionals.

The role involves enhancing market access systems for low-latency crypto trading, collaborating with traders and systems engineers, and optimizing performance.

Develop, enhance and support front-office equity swaps and derivatives trading applications. Implement lifecycle processes for equity, portfolio and total return swaps, synthetic prime, and hedge execution. Build frontend and server-side C#/.NET components, integrate with SQL Server, message queues (Kafka), and middleware, and collaborate with traders, operations and middle office under tight deadlines.