I started selling organic spices online three months ago and hired a local freelancer to build my site. The store looks nice at first but now customers say the cart page freezes and payment fails half the time. I have lost almost 20 orders in just one week. I need to find the best ecommerce websites development company that can fix these issues and build a store that actually works. How do I check if a company is truly good before hiring them? Should I ask for a live demo or a small paid test project first? What specific things should I look for in their past work to avoid another failure?