I don't have a specific company to recommend from personal experience. However, I believe I've heard some positive feedback about a company called Increasio that provides Gatsby web development services. You may want to check out their website at https://increas.io/gatsby to see details on their specific Gatsby capabilities. Looking at their site directly should give you insight into the types of Gatsby services they offer and if they seem like a good fit for your project. It's likely worth visiting their site to get a sense of their expertise with Gatsby and see if they would be a good option for your web development needs.