Senior C# Developer – Financial Services

Prospect 33; New York (NY); On-site; USD 120,000 - 150,000; Full time

Job summary

A leading financial services company in New York City is seeking a Senior C# Developer to contribute to building scalable frameworks for trading systems. This role involves designing high-performance services and collaborating closely with financial analysts and senior engineers. Strong experience in C# and .NET Core is required, along with a passion for developing quality software in a fast-paced environment.

Qualifications

• 7+ years of hands-on experience developing in C# and .NET Core.
• Proven success building high-performance, scalable enterprise systems.
• Experience in financial services or complex, data-driven environments is a plus.

Responsibilities

• Design and build scalable frameworks in C#/.NET Core.
• Develop APIs, middleware, and low-latency services.
• Own the full development lifecycle from architecture to deployment.

Skills

C#/.NET Core development

High-performance system design

Object-oriented design principles

Multithreading

Tools

Angular

SQL Server

CI/CD pipelines

Job description

Overview

Senior C# Developer – Financial Services role with an exclusive buy-side client in Midtown Manhattan. Onsite, full-time. You will write clean, scalable, high-performance code that directly impacts trading and portfolio decisions. This isn’t an architect or management role — we’re looking for a passionate developer who wants to contribute at the code level.

Why You’ll Love This Role

• Work on cutting-edge enterprise frameworks that power mission-critical systems.
• Direct exposure to traders, portfolio managers, and senior technologists.
• Solve real-time performance challenges in a fast-paced financial environment.
• Collaborate in a small, elite team where your impact is visible daily.

What You’ll Do

• Design and build scalable frameworks in C#/.NET Core.
• Apply SOLID principles, clean code, and object-oriented design best practices.
• Develop APIs, middleware, and low-latency services used across trading desks.
• Collaborate closely with quants, portfolio managers, and senior engineers.
• Own the full development lifecycle — from architecture decisions to deployment.

What We’re Looking For

• 7+ years of hands-on experience developing in C# and .NET Core.
• Proven success building high-performance, scalable enterprise systems.
• Strong focus on frameworks, clean code, OOD, and multithreading.
• Experience in financial services or complex, data-driven environments is a plus.
• Familiarity with Angular, SQL Server, and CI/CD pipelines is helpful but not required.
• Must be authorized to work for any U.S. employer (no sponsorship).
• Based in NYC or willing to commute onsite (4 days/week).

Why Join Us

You’ll be embedded with one of the world’s most respected buy-side firms, solving real financial engineering problems with an elite team of developers. We offer a collaborative, fast-paced environment where innovation drives everything we do.

Employment type

• Full-time

Seniority level

• Mid-Senior level

Job function

• Engineering and Information Technology