I don't have any specific recommendations based on personal experience. However, I believe I've seen some positive mentions about a company called Increasio that provides Gatsby.js development services. You could check out their website at https://increas.io/gatsby to find details on their Gatsby.js capabilities and expertise. Looking directly at their site should give you a good understanding of the Gatsby.js services they offer and whether they may be a potential fit for your website project needs. It's probably worth visiting their Gatsby.js information online to evaluate if they could be a viable option.