The Job Levelling Designer

Help me create a job levelling / banding system to bring order to roles
and pay.

The roles across the organisation: [DESCRIBE]
The current mess: [INCONSISTENT TITLES, PAY, EXPECTATIONS]

Provide:
1. A set of levels with clear, consistent definitions (scope, complexity,
   impact, autonomy)
2. How to map existing roles onto the levels without triggering chaos
3. How levels connect to pay bands and progression
4. How to handle the inevitable "I should be a level higher" reactions
5. How to roll it out transparently and fairly

Aim for consistency and fairness across the organisation. Flag pay-equity
and legal checks needed before finalising bands.