Flipster - Mobile Networking Engineer

• Own the SDK-level connectivity layer for the iOS and Android apps in mainland China. • Design and improve transport-layer logic and connection management for mobile clients. • Develop client-side resilience strategies for users operating in challenging network environments. • Test and validate networking behavior directly against real regional network conditions. • Investigate and troubleshoot mobile network issues using platform-specific debugging tools and packet analysis tools. • Optimize app reliability and connectivity performance for Flipster s mainland China user base. • Contribute to architecture and protocol decisions related to mobile networking. • Measure and deliver reliability improvements through hands-on networking work. • 4+ years of mobile SDK development • on iOS or Android, with both preferred. • working on the networking layer of mobile applications. • Direct hands-on • shipping apps to mainland China users with measurable reliability improvements. • Strong understanding of TLS, TCP behavior, and modern transport protocols including HTTP/2, HTTP/3, QUIC, and WebSocket. • Comfortable using Wireshark, tcpdump, Charles, and platform-specific network debugging tools. • Based in mainland China and able to test against real regional network conditions. • in fintech, exchange, streaming, or gaming companies with mainland China users is preferred. • Familiarity with native networking stacks such as NSURLSession, OkHttp, and Cronet is preferred. • Background in protocol design or transport-layer optimization is preferred. • A real, hard, well-resourced technical problem to solve. • A team that values deep network expertise. • Autonomy over architecture and protocol decisions. • Direct impact on the user