C# Trading Systems Developer Job New York New York USA,Software Development

Location: New York

We are seeking a Senior C# Trading Systems Developer to join our engineering team and help build, enhance, and support high-performance trading systems and financial technology platforms. This role is ideal for a hands-on engineer with strong C#/.NET development experience and a background working with trading, brokerage, capital markets, or other real-time financial systems.

Responsibilities

Salary is 180k to 240k + bonus

Design, develop, and maintain C#/.NET trading applications and backend services.
Build high-performance, low-latency services supporting trading and order execution.
Integrate with brokerage APIs, market data providers, OMS/EMS platforms, and other financial systems.
Develop real-time services for market data, order management, execution, and trading workflows.
Work with relational databases and optimize SQL queries and data access.
Troubleshoot production issues and improve system performance, reliability, and scalability.
Participate in architecture and technical design decisions.
Review code and implement best practices for security, performance, and maintainability.
Develop automated tests and support CI/CD processes.
Collaborate with traders, business stakeholders, product teams, and other engineers.
Support production trading environments and respond to time-sensitive technical issues.

Required Qualifications

5+ years of professional software development experience.
Strong C# and .NET experience.
Experience building backend or distributed systems.
Strong understanding of REST APIs, microservices, and event-driven architecture.
Strong SQL/database experience, preferably SQL Server or PostgreSQL.
Experience working with real-time or high-throughput systems.
Strong debugging, problem-solving, and system-design skills.
Experience with Git and modern software development practices.

Financial/Trading Experience

Strong preference for candidates with experience in:

Electronic trading platforms
Brokerage systems
Capital markets
Hedge funds or asset management
Order Management Systems (OMS)
Execution Management Systems (EMS)
Market data
Trading APIs
FIX Protocol
Equities, options, futures, or other financial instruments

Nice to Have

FIX Protocol
Web Sockets
Kafka, RabbitMQ, or other messaging platforms
Redis
Azure or AWS
Docker/Kubernetes
CI/CD
Low-latency/high-frequency trading systems
Experience with trading algorithms or execution workflows

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