C# Developer - Collateralized Mortgage Obligation Platform

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.

Role Overview

Our Client is launching a brand-new Collateralized Mortgage Obligation (CMO) business line in North America. The full IT platform will be built from the ground up. As a core member of the engineering team, you will design and develop a robust, high-performance platform that directly supports Front Office trading and structuring activity.

We are looking for a seasoned C# developer with deep experience in capital markets systems and, ideally, a strong background on CMO or structured products platforms. You are comfortable working in a fast-moving build environment, making architectural decisions, and delivering production-quality code with a small, high-caliber team.

Key Responsibilities

• Design, develop, and deliver core components of the CMO trading platform in C# / .NET
• Build and maintain services for trade capture, pricing integration, position management, and risk feeds
• Collaborate with BAs and Front Office users to refine technical requirements and validate solutions
• Define and implement data models, APIs, and integration layers with upstream/downstream systems
• Ensure code quality through unit testing, code reviews, and adherence to engineering standards
• Contribute to architecture decisions: technology choices, service design, scalability patterns
• Participate in Agile ceremonies (sprint planning, demos, retrospectives)
• Support UAT and production deployment; own post-go-live stabilization

Required Profile

• 5+ years of C# / .NET development in capital markets or financial services
• Hands-on experience building or maintaining a CMO or structured products platform
• Proven track record on at least one greenfield platform build
• Strong understanding of Fixed Income / Front Office business domain
• Experience with high-throughput, low-latency system design
• Proficiency with SQL / relational databases and messaging systems (Kafka, RabbitMQ, or similar)
• Familiarity with CI/CD pipelines, containerization (Docker/Kubernetes)
• Excellent problem-solving skills and ability to work autonomously