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Privacy Policy

Last Updated: March 22, 2026

Introduction

At Product Decode, our mission is to empower every builder to master the language of scale. We believe that privacy is a fundamental requirement for the "Deep Work" and "Flow" states necessary for mastering system design and product strategy. This policy outlines how we handle your data with the highest technical standards.

1. Information We Collect

To provide a "Zero-to-Value" experience that starts the moment you open the app, we collect only the most essential data:

Account Information

When you choose to "Sign in to sync," we collect basic identification to manage your personalized progress and authentication across devices.

Practice Data

This includes your exercise drafts, completed submissions, and progress history to help you track your growth toward Big Tech standards.

Interaction Insights

We monitor how you engage with our "Shuffle" mechanism and various content categories to ensure our challenge repository remains relevant and engaging.

AI Assessments (Pro Users)

For users utilizing our AI Feedback feature, your responses are processed by advanced language models to provide deep, actionable insights and scoring.

2. Technology & Security

We apply a "Big Tech" engineering mindset to protect your privacy and data integrity:

  • •Local Persistence: Your drafts are automatically saved to your browser’s local storage to ensure zero data loss during your "Deep Work" sessions, even before you sign in.
  • •Secure Authentication: We utilize industry-standard, secure cookie-based authentication to maintain your session without compromising site performance or security.
  • •Encrypted Storage: All official practice data and user records are stored in high-performance, secure database environments.

3. How We Use Your Data

Your data is used exclusively to facilitate your journey from "knowing how to build" to "knowing how to design" large-scale systems:

01

To provide and synchronize your minimalist Practice Workspace.

02

To optimize system performance and ensure "Instant Access" to content.

03

To calculate your progress metrics, such as Weekly Practice Completion, to help you build a daily habit.

4. Third-Party Sharing

Product Decode does not sell your personal data. We only share information with essential infrastructure partners to operate our core services:

  • •Cloud Infrastructure: Hosting and edge computing services that ensure our high performance standards.
  • •AI Intelligence: Specialized AI providers used solely to generate Expert Solutions and assessments for Pro users.

5. Your Control and Rights

You maintain full ownership of your learning journey:

  • •Access & Portability: You can review your submission history and expert comparisons at any time.
  • •Data Control: You have the right to clear your local data or manage your account settings through the platform.
Our Commitment:We don't just help you pass the interview; we help you decode the unspoken standards of global tech leadership in a secure, distraction-free environment.