You need to demonstrate your competence for the job you are going for. The simplest way is to talk about a project, as an example to highlight your experience.

Start off by talking about the size and scope of the project

Man days or project length, or project value or team size.

Then talk about the project

What type of company was it for (shows off your experience of verticals)

What was it, implementation, upgrade, whatever

Then talk about what you did.

I did this part of the project and this part and this part. Be specific, this is your chance to shine

Then tell them what software you used.

Finish it off with a tie up.

What the client said, what the users said or something that makes it look like you did a good job.