Sencha / Ext JS Project

We are converting an old, existing Sencha Web application from version 4x to version 6x. We are also overhauling the visual design and user interface. We have completed most all of the new views, and we have made decent progress on the controller logic and data stores. However, we have fallen behind the client-desired time frame for delivery, and we are looking for help to work with us on completing the project. We have in place the new and old code GIT repositories, local and remote test environments, and decent documentation and reference material. We also have the old application to reference the business logic requirements and previous code base. An experienced developer will be able to jump in and get up to speed quickly. Our biggest need is for someone with good skills programming controller logic and data stores. Also, since this is a migration project, we are integrating the new Sencha code with the existing application API, which manages the Web service data calls. We aren't responsible for the API, but we sometimes have to request changes to the API in order to match updated store structure, app behavior, etc. We are willing to pay hourly for a set number of committed hours per week. We expect the project to last approximately 4 - 8 weeks, depending on how much time per week you can work. We are very used to working with contractors, and we believe in treating them like they are an important part of our team. We all used to be freelancers and contractors ourselves until we started our small, custom software company. Thank you for your attention, and we look forward to hearing from you regarding this opportunity.