OVERVIEW

We are building an offline educational desktop application inspired by Duolingo, featuring interactive lessons, quizzes, encrypted local video playback, and cross-platform desktop support.

The application must run on both Windows and Linux systems while supporting legacy and modern Windows environments.

Supported Platforms:

- Windows XP, 7, 10, 11

- Ubuntu 22.04

TECHNICAL STACK

- Programming Language: C++

- Framework: Qt 5.15 or Qt 5.10

- IDE: Visual Studio 2019

- Database: SQLite

- Target Platforms: Windows and Ubuntu 22.04

- Application Type: Offline desktop application

RESPONSIBILITIES

- Develop and maintain a cross-platform desktop application using Qt/C++

- Ensure compatibility with legacy and modern Windows systems

- Build secure offline application architecture

- Integrate SQLite for local data storage

- Implement encrypted local video storage and playback

- Develop video encryption and decryption functionality

- Create responsive and modern desktop UI/UX

- Optimize application performance and memory usage

- Package and test applications on supported operating systems

REQUIRED SKILLS

- Strong experience with C++ and Qt desktop development

- Experience with Qt 5.15 or Qt 5.10

- Experience using Visual Studio 2019

- Experience supporting Windows XP and Windows 7 compatibility

- SQLite database integration experience

- Experience with multimedia/video playback systems

- Knowledge of encryption and decryption technologies

- Experience handling secure local media content

- Understanding of Linux/Ubuntu desktop environments

- Git/version control experience

PREFERRED SKILLS

- Experience with offline-first software architecture

- Familiarity with AES or similar encryption standards

- Experience with FFmpeg or Qt Multimedia

- Knowledge of secure file handling and DRM-like systems

- Experience packaging Qt applications for Windows and Ubuntu

- UI/UX experience for educational desktop applications

KEY FEATURES

- Fully offline operation

- Interactive lessons and quizzes

- SQLite-based local data storage

- Secure encrypted video system

- Video encryption and decryption functionality

- Local video playback

- User progress tracking

- Lightweight and optimized performance

- Cross-platform compatibility

- Modern Duolingo-style interface

SECURITY REQUIREMENTS

- Local video encryption

- Secure video decryption during playback

- Protection against direct media file access

- Secure local content management

- Lightweight encryption implementation compatible with older Windows systems