When looking for a Shopify developer to work on your store, there are a few key factors to consider:

1. Experience: Look for a developer who has experience working with Shopify and has a portfolio of previous projects to show.

2. Skills: Make sure the developer has the necessary skills to meet your needs. This could include experience with customizing Shopify themes, building custom apps, integrating with third-party services, and more.

3. Communication: It is important to find a developer who is easy to communicate with and responsive to your needs.

4. Cost: Shopify developers can have different rates and pricing structures, so it is important to find one that fits within your budget.

5. Reviews and references: Look for a developer that has good reviews from other customers and ask for references from previous clients.

6. Development process: Knowing how the developer works and what is included in their process, such as testing, development, and delivery, will ensure a smooth development process.

7. SEO and optimization: SEO and optimization are crucial for an e-commerce store, so it is important to find a developer that has experience with these areas and can help improve your store's visibility.

It is also a good idea to have a clear scope of work, timelines, and milestones when working with a developer. This will help ensure that your project stays on track and is completed to your satisfaction.