Senior C# Trading Systems Engineer (250-280 pln/hr B2B+VAT)

About the role

Design, build, test, and improve high-performance C#/.NET backend services for foreign-exchange trading systems, collaborating with trading, product, and operations teams. Diagnose production issues, derive implementation proposals from business requirements, and mentor junior developers. Requires at least seven years of C#/.NET development experience, proven experience building front-office electronic trading systems, and strong knowledge of algorithms, data structures, multithreading, event-driven systems, and performance tuning. Candidates should understand trading workflows and low-latency systems, be familiar with FIX, communicate effectively in trader-facing environments, and overlap with US Eastern business hours for six hours.