Google Analytics 4 (GA4) Expert

Our website is built on the React framework, and we have recently migrated to Google Analytics 4 (GA4) for enhanced tracking and analytics capabilities. All the tags has been implemented already but in one or two places we found the discrepancies in the data. We are looking for an expert in GA4 to assist us in ensuring the accurate implementation of tracking tags and resolving data discrepancies.
Responsibilities:
1. Identify the java script that has been used and rectify any discrepancies or issues in tag implementation.
2. Ensure that all tracking tags are correctly implemented and firing as intended.
3. Ensure that events are correctly categorized and labelled for insightful analysis.