Hi. I can set up a nice Maintenance page for you, and it run natively as part of wordpress. This means when you log into the admin and view the site, you will still be able to see the complete site while any non-logged in user will see the maintenance page. This allows you to work on the site. When you are done you simply disable the maintenance page, and if necessary you will always have it available to enable again if necessary. I have examples running on two my websites I can show you.
I have a total of 10+ years in the IT Industry including two Microsoft Professional Certificates and have been working with wordpress and other cms platforms for the past few years. Also, please take a quick look at my profile/feedback and you'll notice I'm a 100% trusted freelancer, a reputation built from perfect accuracy, attention to detail, excellent efficiency and great communication. I strongly believe I'm the perfect candidate for your job and you can be confident knowing you've hired a professional who delivers on-time.
Thank you for reading my proposal and I look forward to hearing back from you toward the start of a healthy working relationship. Kind Regards, Kenny.