Hello,
Myself Nimesh Patel, A senior Magento Certified Developer with having like 5+ Years experience. I developed extensions, Integrate theme, fixed issues, a developed website from scratch, fixed shipping, payment related issues and many more works in Magento 1 and Magento 2. I know Magento core file structure so I can fix issue quickly. I never make changes in core file so the change will remain after upgrade Magento version.
Please find below some of the examples, on which I have worked recently:
Magento 1
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Magento 2
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Please come to discuss your project so I will analyze the requirement and provide you the proper cost and time estimation.
Regards,
Nimesh