Frontend Expert for Ongoing Application Support

We are seeking a skilled frontend developer to support our ongoing application project. The ideal candidate will have experience in AngularJS, PHP, HTML5, and JavaScript. Responsibilities include maintaining and enhancing the application's frontend, ensuring smooth functionality, and collaborating with our team to implement new features. This is a part-time role with a long-term engagement. However first we would like to check the skills and professionalism of the freelancer with one initial project, can mutually decide if we want to work on other projects after that. Person should be available during morning hours for meetings and coordination. Payments will be made upon successful delivery of defined scope. Non Disclosure will need to be signed to protect the Intellectual Property of the app.