user submits file/folder. validate via 3rd party (2-3s latency). store metadata in DB + bytes in S3. return tracking link. async worker fleet for validation. kafka queue. status table in postgres (user, file_id, status, ts). they pushed on partial uploads + resume. multipart S3 upload. checkpoints in metadata.

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JPMC SDE-3 HLD - file upload nov

user submits file/folder.