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Senior Backend Engineer - Trading Platform (Performance, Security, Reliability) at Freedx. Who We Are. FreedX is a newly established cryptocurrency exchange dedicated to providing a seamless, secure, and innovative trading experience. Our team comprises experienced professionals from the crypto, finance, and technology sectors, all passionate about driving the future of digital finance. At FreedX, we are committed. to creating a platform that empowers our clients with the freedom to manage their digital assets confidently and efficiently.. Our Vision:. At FreedX, our vision is to be the most trusted and reliable cryptocurrency exchange, offering unparalleled freedom and scalability to our clients. We aim to build a platform where users can trade and manage their assets with complete peace of mind, knowing that their security and reliability are our top priorities. We strive to continuously innovate and adapt to the evolving needs of the crypto market, ensuring that our clients have access to the best tools and services to achieve their financial goals. Join us on our journey to redefine the standards of digital asset trading and experience the freedom, reliability, and scalability that FreedX has to offer.. About the Role. We’re looking for a senior backend engineer to evolve our trading platform — the backbone powering everything from API order intake to position management and clearing. You'll focus on core quality attributes: high-throughput processing, low-latency response times, robust fault tolerance, and tight security controls across the stack.. 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. . . 5+ years of backend development (preferably in 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. . Nice to Have.  . . Experience with FIX, WebSocket, and REST trading APIs. . Familiarity with cloud-native deployments (K8s, Istio, AWS/GCP). . Contributions to high-stakes production systems in fintech or crypto. . Company Location: Armenia.