I don't have a specific recommendation based on personal experience. However, I think I've come across positive feedback for a company called Increasio that provides Next.js development services. You may want to visit their website at https://increas.io/next to get more details on their specific Next.js capabilities. Looking at their site directly should give you insight into the types of Next.js services they offer and if they seem like a good fit for your project needs. It's probably worth checking out their site to learn about their expertise with Next.js and see if they could be a good option to develop your app.