I will fix shopify bug, theme customization, liquid coding,shopify expert, shopify plus

Yes. That error usually means the theme is calling a snippet or asset that no longer exists, often after an app was removed or code was pasted in. I trace the broken render tag and either restore the file or rewrite the call. Same-day fix in most cases.

Usually one of four things: the section is hidden with the eye icon, it has no content selected, you are previewing a draft theme instead of the live one, or the template has hit the 25 section limit. I check all of these first, then look at the JSON template for syntax damage.

Yes, and it is one of the most common jobs I get. Mobile-only breakage is almost always a CSS media query conflict or a fixed width left behind by an app. I fix the CSS and test on real screen sizes, not just a browser resizer.

It means your theme is doing too much work to render, often from nested loops, an oversized JSON template or too many apps injecting code. I profile the theme, cut the heavy loops and remove leftover app code so the editor loads again

No. I duplicate your theme, do all work on the copy, and only publish once you have seen and approved it. Your live store keeps running the whole time.

Yes. Uninstalling an app rarely removes its snippets and script tags. I go through theme.liquid, the snippets folder and the settings data to strip every leftover, which usually speeds the store up as a side effect.

Yes. I build Shopify 2.0 sections with a proper schema, so every heading, image and colour is editable from the theme editor. You will not need a developer to change text again.

If you still have the old theme in your library, yes. I compare both versions, pull your customizations out of the old theme and port them into the updated one so you keep the update and the changes.