HI,
I'm Bidyut & I'm a WordPress designer & developer (check my profile).
I'll create a responsive application form code for contact form 7, you can see a demo:
[<label> Your Name (required)
[text* your-name] </label>
*******************************
<label> Your Resume (required)
[file* your-resume filetypes:pdf|doc|docx] </label>
[submit "Send Application"]
]
Let's discuss more in the chat.
Thanks,
Bidyut