Remote-first (Italy preferred)Full-time freelance | Long-term (12+ months)We are looking for a backend engineer who deeply understands how systems work under the hood.This role focuses on building and evolving high-performance financial infrastructure powering instant trading and crypto-native financial products.This is strictly a backend role.What You'll Work OnHigh-throughput C#/. NET backend servicesReal-time trading workflowsEvent-driven architecturesStateful systems and persistent connectionsPerformance optimization and concurrency managementLow-latency APIs and financial flowsScalable distributed systemsWhat We ExpectStrong knowledge of C# /. NET internalsSolid understanding of memory management (stack vs heap)Concurrency, multi-threading, async patternsExperience building real-time or low-latency systemsUnderstanding of TCP / / Web SocketsExperience in fintech, trading, crypto or banking systemsStrong ownership mindsetIf you think you are a match, please apply here!