Shopify website ongoing frontend and backend work

We are looking for someone to complete a current project, and be available for any work needed in the future. We have small projects needed a couple of times per month. We currently have 2 things we need done. We had a developer on the front end put up a feature that shows when a product will ship. Since this varies by brand, there is also back end customization where we can show different options based on brand. We need to expand that a bit, and add an option to show variance based on SKU. There is a similar setup for extended warranty options that we need to expand. Currently it shows warranty based on product price, and we need to add another pricing tier for more expensive products. The second project involves both front and back end as well. For certain products that ship via freight, we need to add shipping options such as "add lift gate" and "free pickup at freight terminal" onto both the product and cart pages. This will also vary by brand and SKU, so we need to be able to edit on the back end. We look forward to working with you!