I designed the Laravel API with Sanctum auth, bcmath arithmetic for every balance operation and document workflows for KYC, while the team built a responsive Vue 2 frontend with Vuex and i18n. Deposits and withdrawals go through our own Dogecoin node over RPC, and every withdrawal requires token confirmation. A separate infrastructure repository runs Bitcoin, Dogecoin, Ethereum, Monero and Tron nodes in Docker, with RPC examples for the team. Admins manage users, roles, KYC review, wallet settings and CMS texts.