Magento Developer

Need an expert Magento developer to customize Magento CE 2.3 that will house 4 millions SKUs (modeled as simple product types). Customizations include (1) PDP customization to display available variants (colors, sizes, etc) via dropdowns (2) fetch images from S3 buckets instead of local media folder (3) Elastic search configuration to index only a subset of all products (4) implement a dynamic product selection widget that leverages custom tables. These customizations must be implemented keeping site performance in mind. You must have experience working on a high SKU count and high performance Magento site, and must be familiar with all best practices to performance tune a large magento site.