https://janujan.github.io/Janujan's BlogSoftware engineer. I productionalize things and write about what I learned along the way. 2026-04-22T00:33:27+00:00 Janujan Selvaratnam https://janujan.github.io/ Jekyll © 2026 Janujan Selvaratnam /assets/img/favicons/favicon.ico /assets/img/favicons/favicon-96x96.png Serving Fresh Files with S3 Versioning and Presigned URLs2026-04-18T12:00:00+00:00 2026-04-18T17:22:30+00:00 https://janujan.github.io/posts/s3-versioning-presigned-urls/ Janujan Selvaratnam Serving files to clients sounds pretty boring until you have to account for the freshness of the files being served. In a recent project, I had to support serving fresh files while remaining fast and reliable in production. We’ll see what happens when files are updated as a client is in the middle of a download, and how S3 bucket versioning and presigned URLs can solve it. To understand the pr...