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I will fix squarespace custom CSS code bugs and API integration
Charles
About this gig
Is your Squarespace website breaking after updates, looking broken on mobile, or losing leads due to failed integrations?
Squarespace changes, custom CSS conflicts, and third-party scripts can cause layout issues, broken forms, slow pages, and checkout errors that hurt trust and sales.
I am a Squarespace expert and developer specializing in Squarespace custom CSS fixes, responsive design repairs, and marketing integration troubleshooting. Every solution is written specifically for your template and site structureno copy-paste fixes, no risky shortcuts.
What I can fix:
- Broken layouts, fonts, spacing, and alignment
- Mobile responsiveness issues and mobile-first optimization
- Fluid Engine glitches and section overlaps
- Custom CSS and JavaScript code conflicts
- Broken forms, popups, and lead capture issues
- Klaviyo / Mailchimp / HubSpot integration errors
- Checkout settings and conversion flow problems
- Slow or unstable pages caused by heavy scripts
Why choose this service:
- Clean, lightweight, future safe code that won't easily break
- Safe testing behind the scenes before going live
- Conversion-focused improvements.
Please message me before ordering with your website URL and issue details
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Charles
Charles
website expert
- FromUnited States
- Member sinceMay 2026
Languages
English, French, German
Squarespace Developer & Integration
Hi, I’m Charles. I specialize in custom CSS engineering, mobile-first responsive repairs, and advanced marketing integrations for Squarespace. While many can design a site, I fix the technical framework that makes it sell.
What I Do; Clean Squarespace custom CSS/JS engineering• Mobile-responsive & Fluid Engine bug fixes• Seamless Klaviyo, Mailchimp, & Zapier integrations• E-commerce checkout & form optimization
No copy paste forum codes or risky shortcuts. Just clean, future-safe scripts and zero downtime. Let's fix your site. Message me today!
FAQ
Do you need my primary Squarespace login credentials?
No. For your security, please never share your primary password. Instead, you can invite me as a contributor to your website. Go to Settings > Permissions > Invite Contributor, and add my email address with Administrator or Website Edit
Can you fix custom code directly on the Squarespace checkout page?
Squarespace strictly locks the checkout page on all standard business and commerce plans for security compliance. I can optimize your product pages, shopping carts, and popup integrations, but core checkout page styling cann
Will my website experience any downtime while you fix the bugs?
No. I test complex fixes safely behind the scenes in a staging area, code injection panel, or a duplicated hidden page first. Your live traffic, ongoing sales, and current Google SEO rankings will remain completely unaffected t
What information do you need from me before I place an order?
Please message me first with your website URL (and the site password if it's a private trial site), a brief description of the issue, and screenshots or a quick video clip (like a Loom link) showing exactly what is broken.This allows me to analyze the backend code and give you an accurate quote.
