--- title: Secure File Uploads with Multi-Layer Validation | daily.dev description: Halodoc processes over 300k file uploads daily in healthcare workflows and built a multi-layer validation framework to block malicious files. The system uses... canonical: https://daily.dev/posts/secure-file-uploads-with-multi-layer-validation-eujcav7tj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Secure File Uploads with Multi-Layer Validation | daily.dev og:description: Halodoc processes over 300k file uploads daily in healthcare workflows and built a multi-layer validation framework to block malicious files. The system uses... og:url: https://daily.dev/posts/secure-file-uploads-with-multi-layer-validation-eujcav7tj og:image: https://api.daily.dev/og/posts/eUjcaV7TJ.png og:image:alt: Secure File Uploads with Multi-Layer Validation og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Secure File Uploads with Multi-Layer Validation **[Halodoc](https://daily.dev/sources/halodoc)** · 11 min read · 3 upvotes · 0 comments ## Summary Halodoc processes over 300k file uploads daily in healthcare workflows and built a multi-layer validation framework to block malicious files. The system uses Apache Tika for content-based MIME detection, Apache PDFBox for PDF structure scanning, Apache Commons CSV for formula injection detection, and Java ZipInputStream for archive inspection. Validation layers include filename checks, content-type detection via magic bytes, resource limit enforcement, and format-specific deep scanning for PDFs, images, CSVs, Office documents, and archives. The framework supports both synchronous and asynchronous upload flows, achieves p95 latency under 13ms via fail-fast ordering and type-aware routing, and includes structured rejection reasons to handle false positives in healthcare edge cases. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Accelerating File Uploads at Halodoc: Performance, Reliability & Smart Optimization](https://daily.dev/posts/accelerating-file-uploads-at-halodoc-performance-reliability-smart-optimization-qujmzeddy) · Halodoc · 1 upvotes · 0 comments - [Secure File Upload System](https://daily.dev/posts/secure-file-upload-system-kwux4arbu) · Medium · 0 upvotes · 0 comments - [Building Secure Income Verification Workflows in Web Applications](https://daily.dev/posts/building-secure-income-verification-workflows-in-web-applications-rfzex5sz0) · SitePoint · 0 upvotes · 0 comments - [Handling User Documents Securely in Authentication and Onboarding Systems](https://daily.dev/posts/handling-user-documents-securely-in-authentication-and-onboarding-systems-relkss1zt) · Security Boulevard · 0 upvotes · 0 comments --- Tags: [#appsec](https://daily.dev/tags/appsec), [#healthcare](https://daily.dev/tags/healthcare), [#java](https://daily.dev/tags/java) [View this post on daily.dev](https://daily.dev/posts/secure-file-uploads-with-multi-layer-validation-eujcav7tj) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Secure File Uploads with Multi-Layer Validation","url":"https://daily.dev/posts/secure-file-uploads-with-multi-layer-validation-eujcav7tj","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/secure-file-uploads-with-multi-layer-validation-eujcav7tj"},"datePublished":"2026-03-06T12:11:34.314Z","dateModified":"2026-10-14T02:22:16.950Z","description":"Halodoc processes over 300k file uploads daily in healthcare workflows and built a multi-layer validation framework to block malicious files. 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