Contact person: Cross-Platform Crypto Wallet & Payments

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Location: Mumbai, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I aim to launch a production-ready crypto payment app that works seamlessly on iOS, Android and any modern browser. The core experience is straightforward: users create or import a non-custodial wallet, view balances and history in real time, then send or receive crypto instantly with peer-to-peer transfers (QR code, address or share link).

Security is non-negotiable. Every sensitive action must pass biometric authentication (Face ID, Touch ID or Android fingerprint) and a second-factor code, while all private keys stay client-side, encrypted both at rest and in transit. I expect solid key-management logic, clean error handling and zero server access to plaintext secrets.

A consistent, intuitive interface is just as important. I’m open to a shared codebase such as React Native or Flutter, or fully native stacks if you feel that’s the best route; what matters is smooth performance, maintainable code and an architecture that another developer could pick up quickly.

Deliverables
• iOS, Android and web builds ready for TestFlight / Play Store internal testing and web deployment
• Complete source code repo with clear setup scripts, environment samples and a concise README
• Secure key-management module with client-side generation, encrypted storage and recovery flow
• Peer-to-peer transfer flow with real-time confirmation, push notifications and detailed transaction history
• Automated unit and integration tests covering wallet logic, security layers and critical UI paths
• Handoff session and technical documentation outlining architecture, libraries and future extension points

Acceptance criteria
1. Private keys remain solely on the client; no server ever stores or transmits them in plaintext.
2. Biometric check plus 2FA is enforced for each outbound transaction.
3. A test transfer of 0.0001 asset between sandbox accounts settles in under five seconds.
4. An OWASP Mobile Top 10 scan shows no critical findings.

If this aligns with your skills and you have demonstrable experience shipping secure blockchain apps, let’s talk timelines and the best way to structure milestones." (client-provided description)