Blockchain Developer Required for USDT Buy/Sell Platform (Wallet, Hot–Cold Wallet, Automation)
Budget: ₹400 – ₹750 INR
We are building an advanced USDT Buy/Sell platform with full automation, compliance, and wallet management.
We are looking for an experienced Blockchain Developer to handle only blockchain-related development.
Note: Backend, frontend, KYC, banking, admin panel, and UI work are handled by our internal team.
Your responsibility is blockchain logic, wallets, transactions, and listeners only.
Scope of Blockchain Work
1. USDT Wallet Infrastructure
Create and manage USDT wallets (Hot & Cold)
Support TRC20 / ERC20 (network to be finalized)
Secure private key management
Address generation for deposits
2. Buy USDT – Blockchain Flow
Send USDT from Hot Wallet to user address
Handle transaction creation, signing, and broadcasting
Confirm transaction via blockchain confirmations
Provide TX hash & status callback to backend
3. Sell USDT – Deposit Listener
Generate unique deposit address / TAG / MEMO per user/order
Implement blockchain listener to detect incoming USDT
Validate confirmations
Prevent duplicate or replay crediting
4. Hot–Cold Wallet Automation
Monitor Hot Wallet balance
Auto-sweep excess USDT to Cold Wallet
Cold → Hot transfer logic with manual / multi-approval support
Gas / fee optimization
5. Internal Wallet Logic (Ledger Support)
Support wallet-to-wallet internal transfers (off-chain)
Ensure AML-friendly transaction traceability
Transaction metadata support (user ID, order ID)
6. Security & Compliance Support (Blockchain Side)
Address blacklist checks
High-risk wallet flagging support
Transaction velocity monitoring hooks
Logging for audits
7. Automation & Background Services
Blockchain confirmation service
Auto-retry failed broadcasts
Daily reconciliation support with backend
Fail-safe handling for partial confirmations
Tech Stack (Preferred)
Node.js / Python
Web3.js / Ethers.js / TronWeb
Secure key storage (HSM / Vault / Encrypted Storage)
Experience with USDT smart contracts
REST / Webhook-based integration
What We Expect From You
Strong experience in crypto wallets & USDT handling
Prior work on exchange / P2P / crypto platforms
Deep understanding of hot–cold wallet architecture
Security-first approach
Clean, documented, production-ready code
Deliverables
Blockchain wallet & transaction modules
Deposit listener service
Hot–cold wallet automation
API/Webhook integration with backend
Deployment & testing support
Project Type
Long-term project
Contract / Freelance
Budget: Discussed after technical discussion
To Apply, Please Share
Previous blockchain / USDT projects
Networks worked on (ERC20 / TRC20 / BSC etc.)
GitHub or code samples (if available)
Availability & estimated timeline
We are looking for an experienced Blockchain Developer to handle only blockchain-related development.
Note: Backend, frontend, KYC, banking, admin panel, and UI work are handled by our internal team.
Your responsibility is blockchain logic, wallets, transactions, and listeners only.
Scope of Blockchain Work
1. USDT Wallet Infrastructure
Create and manage USDT wallets (Hot & Cold)
Support TRC20 / ERC20 (network to be finalized)
Secure private key management
Address generation for deposits
2. Buy USDT – Blockchain Flow
Send USDT from Hot Wallet to user address
Handle transaction creation, signing, and broadcasting
Confirm transaction via blockchain confirmations
Provide TX hash & status callback to backend
3. Sell USDT – Deposit Listener
Generate unique deposit address / TAG / MEMO per user/order
Implement blockchain listener to detect incoming USDT
Validate confirmations
Prevent duplicate or replay crediting
4. Hot–Cold Wallet Automation
Monitor Hot Wallet balance
Auto-sweep excess USDT to Cold Wallet
Cold → Hot transfer logic with manual / multi-approval support
Gas / fee optimization
5. Internal Wallet Logic (Ledger Support)
Support wallet-to-wallet internal transfers (off-chain)
Ensure AML-friendly transaction traceability
Transaction metadata support (user ID, order ID)
6. Security & Compliance Support (Blockchain Side)
Address blacklist checks
High-risk wallet flagging support
Transaction velocity monitoring hooks
Logging for audits
7. Automation & Background Services
Blockchain confirmation service
Auto-retry failed broadcasts
Daily reconciliation support with backend
Fail-safe handling for partial confirmations
Tech Stack (Preferred)
Node.js / Python
Web3.js / Ethers.js / TronWeb
Secure key storage (HSM / Vault / Encrypted Storage)
Experience with USDT smart contracts
REST / Webhook-based integration
What We Expect From You
Strong experience in crypto wallets & USDT handling
Prior work on exchange / P2P / crypto platforms
Deep understanding of hot–cold wallet architecture
Security-first approach
Clean, documented, production-ready code
Deliverables
Blockchain wallet & transaction modules
Deposit listener service
Hot–cold wallet automation
API/Webhook integration with backend
Deployment & testing support
Project Type
Long-term project
Contract / Freelance
Budget: Discussed after technical discussion
To Apply, Please Share
Previous blockchain / USDT projects
Networks worked on (ERC20 / TRC20 / BSC etc.)
GitHub or code samples (if available)
Availability & estimated timeline