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TobySun058/README.md

Jiahong (Toby) Sun

AI Systems · LLM Agents · World Models · Robotics & Control

Senior at Washington University in St. Louis studying Systems Science & Engineering and Applied Mathematics, with a minor in Computer Science (expected May 2027).

I build distributed AI-agent systems and efficient LLM infrastructure, and investigate physical representations in world models and nonlinear motion planning for robots.

  • Industry: AI Engineering Intern at Z-UP (distributed A2A agents, MCP tooling) and AT&T (long-context, multi-GPU LLM inference).
  • CMU Min Xu Lab (Aug 2026–present): Counterfactual evaluation and mechanistic-interpretability research on action-conditioned world models, using V-JEPA 2-AC, DINO-WM / JEPA-WM, DROID, and PushT. Targeting a future conference submission; no paper has been submitted.
  • WashU Ching Lab (Jan 2026–present): Nonlinear Gramian-based steering, PMP comparisons, and kinodynamic RRT* evaluations on 3D/5D unicycle models. Manuscript in preparation, not yet submitted.
  • Earlier research: Minimum-energy controlled gradient flow and nonconvex basin maps in JAX; VLM/LLM robot planning in the WashU Kantaros Lab.

Results are specific to the reported evaluations; they do not establish general causal mechanisms or global optimality.

Portfolio · LinkedIn · Email

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  1. careerflow-ai careerflow-ai Public

    Grounded, local-first career workspace with agent orchestration, retrieval, persistent sessions, and MCP integrations.

    TypeScript

  2. controlled-gradient-flow controlled-gradient-flow Public

    Minimum-energy controlled gradient flow for characterizing nonconvex loss landscapes and basin transitions.

    Python

  3. robot-motion-planning robot-motion-planning Public

    Grid search, geometric and kinodynamic RRT, online replanning, and ROS 2 TurtleBot integration.

    Python

  4. crazyflie-flight-control crazyflie-flight-control Public

    Modeling, LQR/LQR-PI control, state estimation, motor mixing, and validation for a Crazyflie quadrotor.

    MATLAB

  5. OpenRSI_MLEvolve OpenRSI_MLEvolve Public

    Frontis/OpenRSI model integration for MLEvolve with structured-output fallbacks and compatibility testing.

    Python