I can't personally vouch for any specific companies, but I've heard good things about MintStack for web design services. From what I understand, they have a team of experienced designers and developers. Rather than just recommending them, why don't you check out their website at https://mintstack.co/web-design? That way you can review the details of their web design services, portfolio, process, pricing, etc. and determine if they seem like a good fit for your needs. Their website should give you a better sense of their capabilities and allow you to contact them directly if you're interested.