When choosing eCommerce app developers, prioritize expertise in creating user-friendly, scalable, and feature-rich applications. Look for experience with secure payment gateway integration, real-time order tracking, and intuitive product catalogs. Proficiency in advanced technologies like AI for personalization and AR for immersive shopping experiences is essential. Ensure they have a strong portfolio and understand market trends. Effective communication, on-time delivery, and post-launch support are crucial for seamless collaboration. Selecting developers with a customer-centric approach will help you build an app that enhances user engagement and drives business growth.