Senior Backend Engineer - Trading Platform (Performance, Security, Reliability)
Company:Freedx
Location:Armenia, Belarus, Ukraine, Russia, Kazakhstan
Languages:English
Seniority level:Senior, 5+ years
Experience:5+ years
Skills:
Backend DevelopmentKafkaC#.NETREST APIMicroservices
Requirements:
5+ years of backend development experience with strong proficiency in .NET (C#) Strong knowledge of concurrent systems, event-driven architecture, and messaging (e.g., Kafka, NATS) Experience designing systems with 99.95%+ uptime, ideally in financial or high-throughput environments Solid grasp of API security, data integrity, and auditability Proven skills in profiling, benchmarking, and performance tuning Experience with FIX, WebSocket, and REST trading APIs (Nice to Have) Familiarity with cloud-native deployments (K8s, Istio, AWS/GCP) (Nice to Have)
Responsibilities:
Design and develop scalable backend services for order routing, risk checks, balance tracking Optimize performance for low-latency API and real-time data feeds Ensure platform resilience under load using circuit breakers, graceful degradation, and auto-recovery Implement and monitor security controls: API key access, rate-limits, trade validation Write unit/integration tests with high coverage and measurable SLAs Participate in incident response and postmortems to continuously improve system reliability
