Use a verified contact path.

Email, GitHub, public site, and a concrete first-message shape without extra contact theater.

Email: ie.yuanhao@tum.de. Best path for a concrete workflow, research question, market bottleneck, or trust boundary.

GitHub: @89325516. Public repositories, project boundaries, and current build evidence live here.

Website: yuanhaochen.dev. Canonical public map for notes, work, open threads, and contact.

Location: Germany. Germany-based builder; useful context when the problem depends on European workflows or institutions.

Fit gate: When a message is worth sending and what context makes it useful.

Work style: How collaboration stays grounded in visible objects, concrete disagreement, and small proofs.

Stay in orbit: Weak-tie signals that can keep a useful thread alive before a project exists.

First reply: The map, evidence bar, or artifact target a strong first exchange can create.