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I will develop, fix, or customize your PHP mysql website
Carlos Kremmer
About this gig
Need help with PHP/MySQL development, custom functionality, or an existing web application?
I provide custom PHP/MySQL development, bug fixing, frontend development, and tailored web solutions for businesses and individuals.
Services I can provide:
- PHP & MySQL development
- Bug fixing and troubleshooting
- Custom web design & development
- Database development and fixes
- Responsive HTML, CSS & JavaScript
- Forms and form processing
- User login and authentication
- Admin panels and dashboards
- Payment gateway integration
- API and third-party integrations
- Booking and membership systems
- E-commerce functionality
- Speed and performance optimization
Why work with me?
- Solutions tailored to your requirements
- Frontend + backend development
- Clean and organized code
- Responsive, user-friendly design
- Existing code troubleshooting
- Clear communication
From a focused PHP fix to a complete custom web project.
For complex work, please message me before ordering with your URL, requirements, screenshots, or examples. I can review the scope and provide a custom offer.
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 Carlos Kremmer
Carlos Kremmer
Senior Web Developer, PHP, WordPress and Custom Software
- FromUnited States
- Member sinceSep 2026
- Avg. response time1 hour
Languages
Spanish, English
I'm Carlos, a Senior Web Developer with 20+ years of experience building websites, custom web applications and business systems. I specialize in PHP, MySQL, JavaScript, WordPress, APIs, databases, custom software and automation. I focus on reliable solutions that solve real business problems, not just websites that look good. I'm also the founder and lead developer of GrowLense, where I connect web development with analytics, business measurement and organic growth. I can help with new builds, existing systems, integrations and ongoing improvements.
My Portfolio
FAQ
What information do you need before starting?
Please send your website URL, a clear description of what you need, and any screenshots or examples that help explain the project. For existing websites, I may also need temporary access to the relevant files, database, hosting, or admin area after the order begins.
Can you fix bugs in an existing PHP/MySQL website?
Yes. I can troubleshoot PHP errors, MySQL/database issues, forms, authentication, frontend problems, broken functionality, integrations, and other issues in existing PHP/MySQL websites. Please contact me with the problem before ordering if the scope is unclear.
Can you develop a custom PHP/MySQL website from scratch?
Yes. I can develop custom PHP/MySQL websites with responsive frontend design, databases, forms, user accounts, admin dashboards, booking systems, payment integrations, APIs, and other functionality depending on your requirements.
Do you work with existing or custom PHP code?
Yes. I can review, troubleshoot, modify, and extend existing PHP/MySQL code as well as develop new custom functionality. I will first review the existing structure to determine the best approach.
Can you integrate APIs and payment gateways?
Yes. I can integrate third-party APIs and payment systems when the provider offers suitable documentation and developer access. Please send the API or payment provider details before ordering so I can confirm the requirements and scope.
What if my project does not fit one of your packages?
Please message me with your requirements. I can review the project and create a custom offer based on the functionality, complexity, estimated development time, and delivery requirements.
Do I need to provide hosting or server access?
For development or troubleshooting on an existing website, access may be required. Depending on the project, this could include hosting, FTP/SFTP, database, cPanel, or website admin access. Please never send passwords before they are actually required for an active project.
Do you provide support after delivery?
Yes. I will address issues related to the functionality delivered as part of the agreed project scope. New features, additional changes, or work outside the original scope can be handled through an additional order or custom offer.
