• Define the end-to-end backend platform architecture, including core services, workflows, and system boundaries. • Establish architectural principles for transaction management, state consistency, durability, and fault tolerance. • Design and implement production-grade backend systems in Golang that handle real financial transactions. • Build systems that integrate cleanly with enterprise-grade external providers (payments, KYC, banking rails). • Ensure correctness under concurrency, partial failure, and distributed execution. • Collaborate with Product, Security, and Infrastructure stakeholders while maintaining architectural integrity.