Hi, here are some of the tips to find the right eCommerce development company (https://www.fortunesoftit.com/au/ecommerce-development-company-australia/)
1. Have a look into companies experience
2. Check their portfolios
3. Analyze their projects and field of expertise
4. Get the profiles of developers
5. Check the reviews for the company
6. Always look for the company which provides support and maintenance post completion of the project.
I hope my answer useful
Thanks