Cross-Platform Encrypted Softphone

I'm seeking a talented developer to create a reliable and secure softphone application for both Windows and Mac operating systems.

Key Features Required:
- Call Recording: Ability to record voice calls with clarity.
- Video Calling: High-quality video call functionality.
- Voice Encryption: Ensuring secure, encrypted voice communication.
- Real-time Language Translation: Feature enabling audio SIP calls with instant language conversion.

User Interface Design:
- The interface should support customizable themes, allowing users to personalize their experience.

Ideal Skills and Experience:
- Proficient in cross-platform software development.
- Experience with SIP protocol and audio/video encoding.
- Knowledgeable in implementing encryption algorithms for voice security.
- Familiarity with implementing real-time language translation in applications.
- Expertise in creating user-friendly, customizable UI/UX designs.

I am looking for someone who can deliver a blend of functionality and aesthetics, with a focus on security and user personalization. If you have a portfolio showcasing similar projects, please include it in your bid.