Hello this is Manouwer Hussain a senior drupal(6,7,8) & php full stack developer for more than 7 years.
I have developed some of the biggest website ,web applications,mobile app in drupal(6,7,8) & php like cms,ecommerce ,web
application,mobile app which is running world wide.
I am expert in drupal,php front end and back end development.
My strength is designing , custom theming using php,HTML,css,javascript,jquery,LESS,SASS etc
,custom functionality development ,custom module development,api development,third party api integration in drupal,
consuming api call ,site architecturing ,SEO optimization .
I am also expert in web service development,mobile app development using PhoneGap or DrupalGap.
I also do Website performance optimization ,caching using memcache,elastic cache,varnish caching,solarsearch integration etc .
i have read your job post
i will do update in your multisite drupal website.
Process.
will backup code and database.
will update drupal core
will update modules on both sites and database.
will test and if everthing is well will apply changes on live
Waiting for your reply