I will build a Web3 backend API with Node.js and NestJS

I will build or extend one production-ready Web3 backend/API module using Node.js, TypeScript, and NestJS.

I have experience building production blockchain APIs for Solana and Ethereum applications, including transaction services, RPC integrations, token operations, metadata systems, confirmation workflows, and external protocol integrations.

Suitable tasks include:

• Blockchain REST API endpoint
• Solana or Ethereum integration
• Transaction-building API
• RPC integration
• Token operation endpoint
• Smart contract interaction service
• Wallet/backend workflow
• Metadata/IPFS integration
• Existing backend debugging or improvement

This Gig covers one clearly scoped API module or integration.