C# Front Office Developer

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.

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Context:

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We are looking for a C# Developer to join a leading international 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.

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Role:

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• Build scalable C#/.NET applications for pricing, risk, connectivity, and reporting

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• Enhance electronic trading workflows to improve performance and usability

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• Support real-time trading through close collaboration with front-office users

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• Contribute to modernization and migration of legacy components to new platforms

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Tech Stack:

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• Core: C# / .NET (4.5+), OOP, performance-oriented development

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• Domain exposure: US Treasuries & IRS / FX Flow / Fixed Income pricing & risk

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• Additional: Python, SQL, Git, Agile / CI-CD

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• Nice to have: React / Angular

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Profile:

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• Solid C# / .NET development experience with strong OOP fundamentals

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• Knowledge of electronic trading systems and workflows

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• Exposure to Fixed Income, FX Flow, or Interest Rate products

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• Strong problem-solving ability and comfort in fast-paced trading environments

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• Proactive mindset and ability to collaborate closely with front-office stakeholders

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