Contact person: Business Client

Phone:Show

Email:Show

Location: Gandhinagar, United States

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I am looking for an experienced blockchain and mobile app developer/team to build a custodial crypto wallet application for Android and iOS using Tatum as the blockchain infrastructure.

This will be an MVP that must be secure, scalable, and production-ready.

Mobile App Requirements (Flutter Preferred)
User Authentication

Email/phone registration and login

Biometric login (FaceID / Fingerprint)

4–6 digit PIN lock

Optional 2FA (Email OTP or Google Authenticator)

Custodial Wallet (Tatum)

Users do not control private keys

Tatum Custodial Wallet integration

Support initial 5–10 coins (BTC, ETH, USDT TRC20/ERC20/BEP20, BNB, etc.)

Wallet dashboard showing:

Balances

Transaction history

Portfolio value

On-Chain Transactions

Deposit:

Blockchain address generation via Tatum

QR code and copy address

Withdraw:

Enter address and amount

Display network fee and platform fee

Biometric/PIN confirmation

Track transaction status

Internal Pay System (Similar to Binance Pay)
User Pay ID / Username

Unique Pay ID generated for each user

Send/Receive funds using Pay ID or QR code

Off-Chain Internal Transfers

Instantly transfer funds between users inside the platform

No blockchain gas fees

Admin-controlled fees and limits

Internal ledger updates balances

QR Payments

“My QR” screen for receiving

Scan-to-Pay for sending internal transfers

Swap / Convert Crypto

Swap between supported coins (BTC to USDT, ETH to USDT, etc.)

Show real-time swap rate and platform fee

Confirm with biometric/PIN

Internal balance update after swap

KYC Verification

User profile form

Upload ID documents (front/back of ID, passport or driver’s license)

Upload selfie (optional but preferred)

KYC status: Pending, Approved, Rejected

Manual review through admin panel

Admin Panel (Web Dashboard)
User Management

View and search users

View balances and transactions

Enable or disable account access

Reset 2FA

KYC Management

Review uploaded documents

Approve or reject applications

Add admin notes

Wallet and Transaction Controls

Manual balance adjust:

Credit or debit user balances

Log all adjustments (admin name, timestamp, reason)

Configure platform fees:

Withdrawal fees (fixed or percentage)

Internal Pay ID transfer fee

Swap fee

Min/max limits per coin

Coins and System Settings

Enable or disable supported coins

Configure networks via Tatum

General system settings

Maintenance mode toggle

Basic Analytics

User statistics

Daily transactions

Deposit and withdrawal volumes

Internal transfer and swap volume

Backend Requirements

Node.js, Laravel, or equivalent

Tatum custodial API integration

Internal ledger for:

Pay ID transfers

Internal balance movements

Swaps

Encrypted database

Secure API and key handling

Audit logging for critical actions

Design and UI

Clean, modern design inspired by Binance Wallet

Dark theme preferred

Smooth wallet navigation

QR scanner and generator integrated

Deliverables

Android and iOS mobile apps

Backend system with API and Tatum integration

Web-based admin panel

Deployment and setup assistance

Complete source code

Documentation

Short post-launch support for bug fixes

What to Include in Your Proposal

Experience with crypto wallets, custodial systems, or Tatum

Tech stack you plan to use

Estimated development timeline

Examples of similar wallet or crypto apps

Your understanding of:

Custodial wallet flows

Internal off-chain transfers

Swap functionality

Required security standards" (client-provided description)