Suyu Jiang (Jerry Su): Rust Systems Engineer & Researcher

Hotaru is a full-stack Rust web framework. A macro-based DSL keeps the URL, the middleware, the configuration, and the handler in one place. One application serves several protocols: HTTP, HTTPS, WebSocket, MQTT, and custom TCP. All protocols share the same state, the same routing, and the same handler style.

HCR integrates Hotaru for network services and Arona for adaptive assessment to teach robot programming in the browser. A student writes a program in a Blockly editor. The program then runs in a 3D simulator built with React Three Fiber, so a physical arm is not necessary. One program IR is the single source of truth. The browser preview, the Rust server replay, and the ESP8266 arm run the same program, and the server replay owns the official score. The system sweeps every motion through a geometric head model before the motion runs. The backend adds adaptive item selection and a generated question bank, and the simulator still runs offline without a network.

Arona is a computerized adaptive testing (CAT) framework in Rust. It keeps zero-cost abstractions, and it also accepts IRT models as plugins at run time. Dynamic trait objects let an operator change the model or the algorithm without compile-time coupling. The framework supports the IEEE ICCSP 2026 Best Paper on Smart Education Systems.