Spa & wellness center booking and management app

We operate a mid-size wellness spa and want a dedicated app to manage bookings and daily operations, because our current spreadsheet workflow keeps double-booking rooms and therapists. The core of the product is a treatment menu where each service carries its own duration, price, required room type and the therapists qualified to perform it. When a guest picks a treatment, the app should only offer time slots where a suitable room and a certified therapist are both free, so we stop overlapping massage cabins and hydrotherapy rooms by accident.

Beyond single bookings we sell memberships and prepaid packages, so the app needs to track remaining sessions, expiry dates and what each guest has already redeemed. A client history view is important: past treatments, notes from therapists, allergies or contraindications, and preferred practitioners should all be visible at check-in. Therapists need their own schedule screen showing their day, breaks and room assignments, while reception needs a floor overview of every room and its status. Please suggest a sensible stack; a clean web admin plus a mobile-friendly guest booking flow is the priority.

We are open to a phased delivery and value clear code and documentation.

— Treatment menu with duration, price, room type and qualified therapists
— Availability engine matching free room + certified therapist to each slot
— Memberships and prepaid packages with session balances and expiry
— Client history: treatments, therapist notes, contraindications, preferences
— Therapist schedules, breaks and room allocation view