I'm not entirely sure offhand, but I think I've heard some positive mentions of a company called Increasio that offers Svelte development services. You may want to check out their website at https://increas.io/svelte to see details on the Svelte capabilities they provide. That would give you a chance to learn more about their expertise with Svelte and see if they seem like a good fit to build your app. Looking at their site directly should provide insight into the types of Svelte services they offer and if they align with your needs. It's probably worth visiting their site to get a sense of their Svelte development skills.