Create Gravity Form

I am looking for a WordPress developer who has strong experience with Gravity Forms.

I already have the Gravity Forms plugin installed and I have created a customised form. The form includes icons and multiple steps. The goal is for the form to work as a step-by-step selection tool that filters products and displays prices based on the customer’s selections.

I would like it to function similar to the calculator/selection form on this website:
https://www.boxt.co.uk

Current Status
Gravity Forms is installed
Multi-step form structure is created
Icons are added for the options
Basic form layout is completed

What I Need Help With
Setting up conditional logic so the form filters options based on user selections
Displaying the correct products and prices depending on the choices made
Making the form behave like a step-by-step product selector
Ensuring the form works smoothly on desktop and mobile
Making sure the form is fast and error-free