Technical SEO expert and Shopify custom code developer

For several Shopify stores for my own company, but also for companies of friends, I am searching for a well experienced Shopify developer. I am not searching for an average designer who is only making Shopify stores according to themes, but the person I am searching for needs to have the capability to custom code stuff and make it easy to adjust for the end-user.

Furthermore, after the store is finished, the person needs to help with technical SEO stuff, like href pages, redirects to 4xx or 5xx, redirects on the homepage (missing/failure). I have tools which can help with this, but the person who is going to help needs to help me fixing this for several websites.

FUrthermore, we need to build new websites from scratch (including design). In this case, also some custom development and maybe some backend stuff (like making an API) needs to be done, but we can discuss this, it is not necessary on the first hand.

Searching in short-term for somebody who can help me with this, there is a big bunch of work so for at least 2 hours a day, preferly more.