C# Developer for High-Performance CMO Trading 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 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 #J-18808-Ljbffr QUANTEAM - North America (RAINBOW PARTNERS Group)