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Fix my Custom Wordpress Backend

I have a custom invoice program programmed through wordpress, it worked well in the beginning, now it's just slow and has a thousand errors!

Who can help me there FAST further?

It is only the backend programmed to the invoice program.

There are now 3-4 errors that need to be fixed.

Everything explained in the attachment as a picture, hopefully understandable.

Skills: PHP, WordPress, MySQL, HTML, Software Architecture

About the Client:
( 1 review ) Bremen, Germany

Project ID: #33955197

170 freelancers are bidding on average €322 for this job

(623 Reviews)
8.9
(880 Reviews)
9.1
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8.7
ahmadayaz

Hi I will Fix your Custom Wordpress Backendm , I'm totally on your end to get started with it, always available to discuss this opportunity, so be rest assured that I will provide you with top-notch work. Just to be More

€230 EUR in 7 days
(322 Reviews)
8.6
bdsiddhi

Dear Employer, Hope You are doing well!! • We are professional WordPress/Woo-Commerce Experts. We have been working on WordPress for the last 10+ years & also developed 200+ WP Projects. • I am very much interested & More

€250 EUR in 7 days
(306 Reviews)
9.0
r4rony

Hello, I have seen your job post and checked all the attachments for this project. I'm interested to help you to fix the custom WordPress backend error on your website and I will give you 100% work results on time More

€250 EUR in 7 days
(235 Reviews)
9.1
(239 Reviews)
8.3
raju51279

hi,how r u, can i check ur present site url n if possible give [login to view URL] provide list of changes. Please check recent wordpress websites [login to view URL] (elementor) [login to view URL] (elementor) https://lokal More

€287 EUR in 5 days
(1080 Reviews)
8.6
(352 Reviews)
8.2
(267 Reviews)
8.3
(129 Reviews)
8.1
Friends4it

We already have built large scale applications, CRMs, ERPs and huge systems can be found at our website. Like [login to view URL] [login to view URL] [login to view URL] [login to view URL] [login to view URL] https: More

€220 EUR in 5 days
(503 Reviews)
8.2
Brightinfotech3

Dear Sir/Mam, Hope, you are doing well...!!! Thanks for sharing your project requirements. I have checked your Job Description. We need to work into your existing website and fix some issues. Can you please send me More

€150 EUR in 5 days
(365 Reviews)
7.9
ykarora26

Hello sir, You are looking for Fix my Custom Wordpress Backend . I have read your job description and assure you that I am a perfect fit for the job. I am a senior Designer & Developer having 9+ years of experience in More

€200 EUR in 7 days
(364 Reviews)
8.0
(347 Reviews)
7.9
dagdya99

Hi, I'm interested to work on your project: Fix my Custom Wordpress Backend , I will start project immediately Please let me know if you require any detailed information. Waiting for your reply Thanks

€100 EUR in 1 day
(568 Reviews)
7.9
(396 Reviews)
8.1
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8.4
(566 Reviews)
7.8
maxsmith8

Hi There, I can start right away and complete your project successfully. I am a Senior Full-Stack developer with over 8 years of experience . I specialize in Front-End and Back-End web development, ranging from small More

€250 EUR in 5 days
(301 Reviews)
8.1