Javascript developer with Salesforce experience

Job ID: 35506452

Budget: $15 – $25 USD

Our customer has a VisualForce page in their Salesforce environment which uses Slickgrid ([login to view URL]) to do real-time updates on figures across a grid as the user enters details.
The customer wants more columns added that will need to be factored into existing real-time calculations and then saved back to Salesforce.
While we can manage the Salesforce side we are short on javascript experience to manage this internally.
Specifically, they need a new promo discount % column added and a promo discount amount. Filling in the % works out the amount from other columns already int he table, filling in the promo amount sets the % etc etc. New fields will be created in Salesforce to store the additional data.
Excellent written and spoken English