Bug Fixing & MySQL Migration

Seeking experience PHP Coder to handle the following 1. Bug Fixing (all related to Paypal IPN codes) i. Created a new account but no notification email received. ii. After Paypal payment, user should be redirected automatically to updated page. iii. Notification email to be send per email template provided. iv. Donation appeared double when 1 transaction is made. v. Display of search field to be adjusted. 2. Migrate from SQLite to MySQL i. Modify PHP scripts to save data to MySQL ii. Improve the database structure for faster and more efficient data query, inserting and processing. iii. Optimise database query handling to improve database response time. iv. Setup daily backup routine of the database. Bidder must have past experience with Javascript and SQLite. Access to review the data file and dev site will be provided to shortlisted bidders.