• Design, implement, test, and maintain core client features in Go: connection orchestration, reconnection strategies, NAT traversal, encrypted transport lifecycle, and sync logic. • Ship end-to-end client work: design, implementation, launch, and observability (metrics, logs, traces). • Diagnose and reduce client performance and reliability issues. • Collaborate closely with product, per-platform clients, and platform teams. • Champion engineering excellence by driving code quality, architectural reviews, and design documentation. • Provide technical leadership and mentorship to other engineers, fostering a culture of learning and knowledge sharing.