The Syncplicity Desktop client. At the time, we were a major Dropbox competitor and an overall industry leader. I was able to make our desktop client faster tha

The Syncplicity Desktop client. At the time, we were a major Dropbox competitor and an overall industry leader. I was able to make our desktop client faster than Dropbox and handle ~250,000 files. Shortly after I left, Dropbox released their Rust-based client. I don't know how they compare. The big complication in a product like this is the metadata. Things that might not seem like a big deal, like string comparisons, must be super-optimized.