Add new features to existing Slack ap

I have an existing Slack app that is basically a Slash command type of app. The app itself is like a proxy between Slack and customer's JIRA. You can get info about JIRA tickets from Slack, you can create JIRA tickets from Slack, etc. The app itself is can be triggered by typing a predefined command in Slack. When the app service is triggered, the app sends a JIRA request and upon receiving a response, it sends the result back to Slack channel. I want to find a freelancer that will be capable of doing additional features for this project on a permanent bases. I would like to find someone who will be doing bugfixing, new features and maintenance work for this project. Please write "I read it" in your bid so I could make sure you know what you are bidding for. The successful candidate will sign and NDA with me. The first thing that needs to be done is adding Slack buttons integration to my app, clicking on a button should attach Slack conversation of the channel as a JIRA comment. Read more about Slack buttons here [login to view URL]