Jira is a tool for executing the implementation portion of your software. Notice I did not say implementation phase. Also notice there is a design portion of so

Jira is a tool for executing the implementation portion of your software. Notice I did not say implementation phase. Also notice there is a design portion of software. It's important to distinguish between design and implementation. Creating a plan is not the same thing as executing the plan. All these things can overlap and have feedback in both directions.