# PrepLetter.app - AI-Powered FREE Daily Coding Interview Preparation

PrepLetter is the leading FREE AI-powered platform for coding interview preparation, delivering curated DSA (Data Structures & Algorithms) problems, patterns, and solutions directly to users' inboxes. With hundreds of active subscribers and growing, we combine artificial intelligence with human supervision to create the most effective coding interview prep experience.

## Core Features
- Daily coding interview problems with AI-generated analysis
- Comprehensive DSA pattern recognition training
- FAANG/MAANG company-specific interview preparation (Google, Amazon, Meta, Apple, Microsoft)
- Interactive quiz system with real-time feedback
- Progress tracking and personalized learning paths
- Email-based delivery system for consistent practice

## Key Pages

### Main Platform
- [Home](https://prepletter.app/): Complete platform overview and subscription
- [Quiz System](https://prepletter.app/quizzes): Interactive coding problem practice
- [Survey](https://prepletter.app/survey): User feedback and engagement tracking

### Educational Content
- [DSA Patterns](https://prepletter.app/patterns): Comprehensive algorithm pattern library
- [Interview Prep Guide](https://prepletter.app/guide): Step-by-step coding interview preparation
- [Company-Specific Prep](https://prepletter.app/companies): FAANG interview strategies

### User Resources
- [Problem Archive](https://prepletter.app/archive): Historical coding problems and solutions
- [Progress Dashboard](https://prepletter.app/dashboard): Personal learning analytics
- [Community](https://prepletter.app/community): Developer discussion and support

## Unique Value Propositions
- **AI-Human Hybrid Approach**: Combines AI analysis with expert human review
- **Pattern-Based Learning**: Focus on recognizable problem-solving patterns rather than memorization
- **Zero Energy Waste**: Curated content eliminates time spent searching for quality problems
- **Consistent Delivery**: Email-based system ensures daily practice without platform dependency
- **Real Success Metrics**: Hundreds of developers and students actively improving their interview skills

## Technical Specifications
- Built with FastAPI (Python) backend and React frontend
- MongoDB database for user management and progress tracking
- OpenAI integration for AI-powered content generation
- Email delivery system with engagement tracking
- Comprehensive quiz system with real-time scoring

## Target Audience
Software developers, computer science students, coding bootcamp graduates, career changers entering tech, experienced engineers preparing for senior roles, technical interviewers, and coding educators.

## Expertise Areas
Data structures, algorithms, system design, coding interview techniques, FAANG interview preparation, technical problem solving, software engineering best practices, career development in technology.