Rust

Rust for production backend services on NotNull Online: Axum HTTP API on Tokio, Serde, the MongoDB Rust driver, and a Hexagonal Architecture layout (domain ports, application use cases, infrastructure adapters). Business logic stays free of framework and cloud coupling; AI, search, storage, and persistence are injected through traits. Experience includes async services, JWT/cookie auth, RAG orchestration, embeddings pipelines, and automated Rust integration tests.