Contact person: Business Client

Phone:Show

Email:Show

Location: Barranquilla, Colombia

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"We are seeking an experienced Blockchain / Web3 Developer to integrate blockchain-based payment solutions into our existing online casino web game platform. The project requires upgrading the current payment gateway to support cryptocurrency deposits, withdrawals, and wallet connectivity, while maintaining compliance, security, and scalability.

Responsibilities
- Design and implement Web3 payment gateway supporting multiple cryptocurrencies (e.g., BTC, ETH, USDT).
- Integrate wallet connection features (MetaMask, WalletConnect, etc.) for seamless user experience.
- Develop smart contract interactions for secure deposits, withdrawals, and in-game tokenization.
- Ensure real-time transaction validation and update the game backend with on-chain payment data.
- Build scalable APIs to connect blockchain services with the existing casino backend.
- Implement KYC/AML and compliance checks where required.
- Optimize transaction speed, reduce fees, and improve reliability of blockchain interactions.
- Conduct security audits for wallet and contract integrations.

For deliverables I’ll need:
• Gateway selection rationale and API keys configured in my dashboard
• Cleanly written integration code (language/framework details on request) that creates, verifies and posts back subscription payments
• Webhook handling for renewals, cancellations and failed charges
• A short README explaining setup, environment variables and how to add new plans or currencies
• Final round of live test payments with me on a screen-share to confirm everything works

If you’ve previously connected crypto gateways to SaaS or membership platforms and are comfortable with security best practices, I’d like to get started right away." (client-provided description)