Maintenance already existing website

I am in need of experienced and professional help with maintenance for an already existing website. The website was custom-built, so I need someone who can work specifically on this type of platform. I need design updates to this website, and the timeframe needed to complete these updates is within 1 week. The ideal candidate should be highly knowledgeable and experienced in working with custom-built websites. If you have the relevant qualifications and experience needed for this project, please get in touch.