Valentine U.

Calnita — 13 services. Users, Products, Brands, Payments each isolated behind an API gateway. RabbitMQ for inter-service messaging, MongoDB, Redis, AI recommendation engine. React web client, React Native mobile client. ISellVouchers — gaming voucher marketplace. Stripe for fiat, in-house service for crypto. RabbitMQ for async voucher issuance and inventory sync. 8K to 65K monthly users. ArenaPlay — live streaming. Video pipeline migrated to AWS, Mux, Cloudflare. Velt Finance — blockchain payments infrastructure. Escrow contracts, conditional release, multi-condition settlement. Rust and TypeScript primarily. I maintain toni, a NestJS-inspired Rust web framework, and winston_rs, a logging library. Four scalars merged into graphql-scalars. Node.js, NestJS, GraphQL, gRPC, Kafka, PostgreSQL, Redis, Docker, Kubernetes, Solidity, Terraform. Architecture through deployment. Written communication, UTC+3.