Top Senior C# Jobs in NYC, NY

Implement and integrate mortgage prepayment models into the firm's C++ analytics library. Deliver production-grade, performant, modular code with comprehensive unit/integration tests, API integration, versioning, and documentation. Collaborate with quants, model validation, business, and technology teams to ensure backward compatibility and operational readiness.

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.

The Senior Software Engineer will design, develop, and maintain scalable backend services and APIs, working with cross-functional teams to improve cancer care through technology and data solutions.

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

The Senior Software Engineer will enhance software security measures across Rockstar Games' products, focusing on anti-cheat and anti-tamper technologies. Responsibilities include debugging, performance profiling, and collaborating with cross-functional teams to improve game security.

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.

As a Senior Software Engineer, you will design and develop key components of Stellar Core, enhance blockchain technology, and collaborate with engineering teams.

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 Senior C# Developer will lead AI enablement by transforming APIs into an Agent Mesh using C# and the MCP, ensuring secure AI interactions through Gravitee management.

The Senior Software Engineer will design core components of the XRP Ledger, integrate a WASM VM, and lead software development from design to testing in C++ and Rust.

The role involves developing and supporting the Citi Velocity platform, providing technical oversight, collaborating with global teams, and managing complex system integrations while ensuring compliance with standards and risk management procedures.

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.

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

Develop and maintain .NET Core trading systems for Linux with service-oriented architecture and multi-threaded processing. Implement async, lock-free structures and distributed systems, write unit and integration tests, optimize SQL queries, design data structures and algorithms, and work with communication protocols (SignalR, gRPC, HTTP). Use PostgreSQL, Docker, and AWS in the deployment stack.

Develop and optimize ultra-low-latency, high-performance trading infrastructure in modern C++. Implement and tune order execution, market data connectivity, multi-threaded systems, and risk modules. Profile and benchmark real-time systems, collaborate with quants and traders, and maintain robust, fault-tolerant continuous trading operations.

The Senior Software Developer will design high performing, scalable server systems, develop APIs, and enhance web security while working on challenging projects.

Lead a team to develop SaaS solutions while coding and mentoring engineers. Responsible for technical leadership and team management.

Develop and optimize automated trading infrastructure, collaborate with Traders and Quants on trading algorithms, create scalable multi-tiered applications.

As a Senior Engineer on the Market Data team, you will design high-performance libraries for trading systems, ensuring fast and reliable market data delivery while collaborating with various teams.

As a C++ Software Engineer, you'll develop market data infrastructure, enhance trading systems' performance, and collaborate with researchers to improve trading strategies.

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

Design, build, and operate scalable .NET/C# applications and integrations for Private Wealth. Own end-to-end delivery, write well-tested code, optimize data and queries, troubleshoot production issues, mentor junior developers, and drive platform modernization and CI/CD improvements.

Design, build, and maintain backend workflow orchestration and state management for analyzer integrations on the ECL platform. Modernize legacy .NET systems, ensure reliable event-driven operations, collaborate with integration, infrastructure, and QA teams, and preserve workflow behavior during knowledge transfer.

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.