Top C# Jobs in NYC, NY

Develop and maintain production front-end trading software using C#, WPF, and MVVM. Responsibilities include creating prototypes, reusable controls, themes, style dictionaries, interactive user experiences, and production-ready components. Collaborate across teams, apply design patterns and development best practices, and test and resolve product issues. The role requires onsite work in Great Neck, Long Island, New York.

Lead modernization of a 30-year-old Store Management System by reverse engineering EZC file-based platforms, migrating data and applications to PostgreSQL, and developing enterprise C/C++ software. Responsibilities include architecture, systems integration, APIs, ETL, performance optimization, troubleshooting, documentation, and maintaining business continuity. The role also applies AI-assisted development tools for code analysis, documentation, testing, and modernization while mentoring teams and supporting legacy and modern environments.

Design, own, and optimize low-latency trading infrastructure supporting real-time data processing, order execution, market data, and strategy implementation. Build fault-tolerant systems, execution logic, venue gateways, test harnesses, and data-analysis pipelines. Partner with quantitative researchers and traders while making architectural decisions, applying modern C++ practices, and supporting systems from design through production. The role requires onsite collaboration four days per week.

The C++ Developer will implement, test and deploy features for a high-frequency trading system, optimize performance, and debug issues.

Build and optimize high-performance C/C++ and Rust server applications and feed handlers for market data. Implement parsers, petabyte-scale processing tools, and low-latency, high-throughput optimizations. Collaborate on build/deploy/CI, monitoring, and ensure reliable feature rollouts.

The engineer will develop low latency trading systems, optimize performance, and improve frameworks. Collaboration with traders and researchers is key.

The C++ Developer will design, develop, and maintain applications, particularly in C++ on Unix, and perform process analysis and improvement.

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, implement, and optimize scalable backend software solutions. Collaborate with team members and uphold coding standards while troubleshooting and maintaining software performance.

Develop and scale high-performance, multithreaded C# desktop trading UI components within an Agile team. Evaluate new technologies, profile .NET memory/performance, write unit tests, collaborate across teams, and manage multiple concurrent projects.

Design and develop massively parallel distributed database kernels for real-time analytics at terabyte and petabyte scale. Responsibilities include low-level C++ development, MPP query execution, SIMD and hardware optimization, distributed communication using MPI and RDMA technologies, database internals, vector indexing, in-database machine learning, performance tuning, architecture reviews, mentoring, and resolving scalability issues.

Design and develop low-latency, high-throughput distributed database kernels for massively parallel analytics. Responsibilities include query execution, columnar storage, transaction management, cluster coordination, hardware-aware optimization, SIMD vectorization, RDMA networking, in-database machine learning, vector indexing, performance tuning, architecture reviews, code reviews, mentoring, and resolving scalability issues.

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.

The role involves developing and maintaining trading user interfaces, enhancing performance of C# components, and adapting to project changes while collaborating with teams.

The C# / .NET Developer will design and maintain middleware applications, build Shopify integrations, and support a mobile app backend in a remote work environment.

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.

Design, implement, and optimize high-performance, low-latency trading infrastructure for research and production. Partner with researchers and traders to build market data, execution, backtesting, and deployment systems. Develop tools for prototyping, simulation, monitoring, risk management, and performance analysis across the strategy lifecycle.

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.

PrivateID seeks a Principal C++ Engineer with at least 10 years of experience to lead complex systems and scale their platform in a remote-first environment.

You will develop and maintain components of the LLVM based toolchain, collaborating with the community while ensuring platform-specific optimizations and tests.

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.

Develop and maintain systems for systematic investing, focusing on data pipelines, trading tools, and technical monitoring within a collaborative team.

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.

Design and build key components of Stellar Core, improve system performance, collaborate on architecture, and lead technical discussions.