We have worked with the same Wordpress developer since 2012. They recently redesigned our Wordpress site. We purchased a real estate theme and they performed major modifications to it. The project took 8 months. There are many customized widgets and multiple plugins.
We hired a new SEO. The SEO is very comfortable coding. The SEO performed certain modifications and the code broke. The original developer stepped in and and helped restore the code. The SEO stated that the site should not be so delicate; that too many plugins and widgets are used making it inherently unstable. The original developer is claiming that the SEO did not follow best practices (they did not use a dev server to test). For a non technical business owner this is very disturbing. We finally agreed that the new SEO would make changes on a dev server and the original developer will check these changes to ensure they do not break the code.
My question is, shouldn't a Wordpress site be simple enough to hand over to a decent coder with little risk of breaking the code? Are there any standards regarding the hand over of a site? I am comfortable with my developers, but what if they change professions or close their company? How would I transition the site?
There must be standards and protocols that allow a third party, such as an SEO to change code without causing havoc. Any one have some insight?