Client Onboarding Tracker

Build an internal tool for my team: "Client Onboarding Tracker".

The problem: Client onboarding lives in one person's head, and things fall through the cracks.
Who uses it: a team of 2–25 people.

What it should do:
- Stages: Kickoff, setup, training and live, or whatever your process actually is.
- Client cards: Each client shows its owner, start date and checklist progress.
- Handoff: When a checklist is done, the client moves on and the next owner is notified.
- Checklist templates: The same steps every time, editable as you learn.

Data:
- Client { name, owner, stage, started_at }
- Stage { name, position, checklist_template[] }
- Task { client_id, stage_id, title, done_at?, done_by? }

Constraints:
- Built for one team inside one company. Simple sign-in (or none), no billing, no multi-tenant setup.
- Fast, calm and obvious enough that teammates need zero training.
- Data must persist and be shared across the team.
- Ship the simplest version that works, then tell me what you'd add next.

Works with Claude, ChatGPT, Cursor, Lovable, Replit or Type.