Top Senior C# Jobs in NYC, NY

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

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.

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.

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.

As a Software Engineer for Options Trading, you'll design and optimize trading systems, collaborating with traders to implement strategies and improve performance within a fast-paced environment.

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.

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.

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

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

Lead re-architecture and modernization of a legacy C++ execution kernel, improve performance, memory and concurrency behavior, diagnose production issues, and provide technical leadership across design, code review, and cross-functional collaboration.

Design and optimize high-performance C++/CUDA libraries for GPU-based data processing. Improve multi-node GPU communication (UcxExchange), optimize Presto GPU query performance, and lead enhancements across Presto, Velox, and cuDF projects for efficient DataFrame and database acceleration.

Develop and maintain the Java client library and high-performance C/C++ server applications. Implement message parsers and feed handlers, optimize for extreme throughput and low latency, build tools for petabyte-scale processing, collaborate on build/deploy/CI practices, monitor uptime, and support smooth feature rollouts.

Implement and maintain the C# client library and high-performance C++ server applications. Build message parsers and feed handlers, optimize for millions of messages/second and nanosecond latency, develop petabyte-scale data tools, collaborate on build/deploy/CI/CD, monitoring, and ensure reliable feature rollouts.

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.

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.

C# developer for fixed income/commodities front-office technology. Full SDLC with support responsibilities; build and maintain trading systems, databases, and UIs using .NET, DevExpress, messaging middleware, SQL Server/Sybase. Requires strong debugging/triage and communication skills. Unit testing and meta-programming, OpenLink/ETRM, and trading product knowledge are desired.

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 Staff Software Engineer for Liquidity Management, you'll lead architectural decisions, mentor engineers, and drive platform development, focusing on scalable, reliable systems for treasury management in a fast-paced environment.

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

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.

As a Sr. Software Engineer at Bloomerang, you will lead technical direction, mentor engineers, and enhance SaaS solutions while utilizing .NET and AI tools. You will ensure scalable, maintainable applications, advocate for Agile workflows, and focus on quality outcomes in software development.