Banking integration for crypto platform

Title
Banking Integration + Fiat Treasury Ledger + Auto-Buy USDT Module (Integrate With Existing Crypto Converter) Description:
I am building a fintech-style crypto platform and I need a developer to extend my existing crypto converter system with full banking-to-crypto integration. The core converter is already built and working (it signs real Ethereum transactions using my MetaMask private key), but now I need the banking and fiat side implemented. 1️⃣ Banking Integration Module (API/Webhook or JSON Feed)
• Detect incoming bank wires/ACH deposits from my banking provider
• Parse deposit JSON data (amount, sender, reference, timestamp, currency)
• Mark deposits as verified
• Store deposits in a Fiat Treasury Ledger (see below)

2️⃣ Optional SWIFT/MT103 Document Upload
• Admin-only interface
• Upload PDF or image of MT103/SWIFT confirmation
• Extract or manually enter UETR, reference ID, sender bank, amount
• Treat verified uploads exactly like a bank deposit
• Add deposit to ledger

3️⃣ Fiat Treasury Ledger System
• Track incoming fiat balances internally (USD ledger)
• Maintain user/platform balances
• Store reference numbers, metadata, and history
• Ledger must be accurate and tamper-proof (double-entry style preferred)

4️⃣ Auto-Buy USDT Module (Exchange API Integration)

After the deposit is recorded in the ledger:
• Use Binance/Coinbase/Kraken API (or another exchange)
• Execute a buy order for USDT equal to the fiat deposit
• Handle authentication, order creation, and order confirmation
• Transfer purchased USDT automatically into our designated MetaMask treasury wallet
• Log all actions

5️⃣ Integrate With Existing Crypto Converter (Already Built)

My existing converter already sends USDT on the Ethereum network using:
• wallet.txt private key
• Web3
• ETH for gas

You need to:
• Ensure MetaMask treasury wallet receives purchased USDT
• Ensure ETH balance is sufficient for gas
• Pass the updated USDT balance into the converter
• Trigger the converter to send USDT to the client’s wallet

The converter handles on-chain sending only — YOU are building the fiat → USDT → treasury wallet pipeline.

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DESIRED SYSTEM WORKFLOW
1. Bank deposit arrives
2. Deposit is verified (API or MT103 upload)
3. Deposit is written into Fiat Treasury Ledger
4. Auto-buy module purchases USDT from deposit amount
5. USDT is deposited to MetaMask treasury wallet
6. Converter sends USDT to client on-chain

This is a real fintech workflow similar to Crypto.com / CashApp flow.

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TECHNOLOGIES REQUIRED
• Python (preferred)
• Web3.py (already used in converter)
• REST APIs / Webhooks
• Exchange API integration (Binance, Coinbase, Kraken, etc.)
PDF/MT103 parsing (OCR or manual entry)
Ethereum transaction knowledge (ERC20, gas, private key signing)
Ledger design / database schema
Strong security practices

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WHAT I WILL PROVIDE
• Access to existing converter code
• Wallet paths and structure (wallet.txt)
• Server environment (Linux)
• Any API keys needed
• Clarifications and examples of workflow
• MT103 sample documents if needed
Please respond with:
1. Your experience with banking or payment integrations
2. Your experience with crypto, Web3, ERC20 tokens
3. Which exchange API you recommend for the auto-buy module and why
4. Estimated timeline
5. Any clarifying questions about architecture

Only apply if you have real experience in fintech/crypto systems. $800 – $2,000 USD (fixed budget)
Realistic bids will be considered.
Experience with banking APIs or crypto is a major advantage.