Contact person: Business Client

Phone:Show

Email:Show

Location: Brčko, Bosnia and Herzegovina

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I’m looking for someone who can take me from concept to store-ready builds of a fully private messenger that runs smoothly on both Android and iOS. The core must be rock-solid end-to-end encryption so that neither the server nor any third party can read user content.
The app should let users exchange real-time text and voice messages, handle push notifications reliably, and present a clean, modern interface that feels instantly familiar to anyone who has used WhatsApp or Signal.

Here’s the journey I have in mind:

• Mobile clients: Native quality on each platform (I’m open to Kotlin/Swift, Flutter, React Native—whatever lets us ship fast without sacrificing polish).
• Encryption layer: Proven algorithms (e.g., Signal Protocol, libsodium, or equivalent) with proper key-pair generation, forward secrecy, and secure key storage on device.
• Backend: A lightweight, scalable service to broker delivery, manage device tokens, and enforce E2E without retaining any readable payloads.
• Quality gates: Unit + integration tests, code comments, and clear build instructions so I can compile the project myself at any time.

Acceptance criteria
– Successful exchange of text and voice messages between two devices on each platform, verified in TestFlight / internal track.
– Independent inspection confirms that messages stored on the server are indecipherable.
– No crashes during a 48-hour soak test with at least 100 concurrent conversations.
– Complete source code, build scripts, and minimal setup guide delivered before sign-off.

If you’ve shipped secure chat apps before—or have deep cryptography experience—let’s talk specifics and map out the milestones together.

Please also list the requirements for such a business, and your estimates on monthly expenses.

Keep it short and be direct in proposals, I don't want to read through novels.

Thanks and let's work" (client-provided description)