C# Front Office Developer

QUANTEAM - North America (RAINBOW PARTNERS Group); New York (NY); On-site; USD 120,000 - 180,000; Full time

Job summary

QUANTEAM - North America (RAINBOW PARTNERS Group) seeks a skilled C# Developer to join a leading international financial institution's New York technology team focused on front-office electronic trading. You will build scalable C#/.NET applications and help modernize legacy components across US Rates, FX Flow, and Fixed Income pricing.

The role requires strong OOP and real-time collaboration with traders, quants, and sales in an Agile environment.

Qualifications

• Solid C# / .NET development experience with strong OOP fundamentals.
• Exposure to electronic trading systems and workflows is a plus.
• Knowledge of Fixed Income, FX Flow, or Interest Rate products is advantageous.
• Ability to work in a fast-paced trading environment and solve problems quickly.
• Collaborates effectively with front-office stakeholders to deliver business value.

Responsibilities

• Build scalable C#/.NET applications for pricing, risk, connectivity, and reporting.
• Enhance electronic trading workflows to improve performance and usability.
• Support real-time trading through close collaboration with front-office users.
• Contribute to modernization and migration of legacy components to new platforms.
• Leverage Python, SQL, Git within an Agile/CI-CD environment.

Skills

C# / .NET

OOP

Python

SQL

Git

CI / CD

Front-office trading

React

Tools

React

Angular

Job description

As the founding entity of RAINBOW PARTNERS, Quanteam is a consulting firm specialized in Banking, Finance, and Financial Services. Through our core human values – proximity, teamwork, diversity, excellence – our 1000 expert consultants, hailing from 35 different nationalities, collaborate across 13 international offices: Paris, Lyon, New York, Montreal, London, Brussels, Luxembourg, Geneva, Lisbon, Porto, Casablanca, Madrid and Singapore.

Context:

We are looking for a C# Developer to join a leading i nternational financial institution's New York technology team, supporting front-office electronic trading. The group builds and maintains high-performance platforms across multiple asset classes — including US Rates, FX Flow, and Fixed Income pricing. The environment is trading-floor aligned, dynamic, and Agile-driven, with direct interaction with traders, quants, and sales.

Role:

• Build scalable C#/.NET applications for pricing, risk, connectivity, and reporting
• Enhance electronic trading workflows to improve performance and usability
• Support real-time trading through close collaboration with front-office users
• Contribute to modernization and migration of legacy components to new platforms
• Core: C# / .NET (4.5+), OOP, performance-oriented development
• Domain exposure: US Treasuries & IRS / FX Flow / Fixed Income pricing & risk
• Additional: Python, SQL, Git, Agile / CI-CD
• Nice to have: React / Angular

Profile:

• Solid C# / .NET development experience with strong OOP fundamentals
• Knowledge of electronic trading systems and workflows
• Exposure to Fixed Income, FX Flow, or Interest Rate products
• Strong problem-solving ability and comfort in fast-paced trading environments
• Proactive mindset and ability to collaborate closely with front-office stakeholders