Integration of the fiat payment system to the NFT sales site

Project Overview We are looking for an experienced full-stack blockchain developer to create a next-generation decentralized finance (DeFi) platform. The project involves developing a secure, scalable, and high-performance Web3 infrastructure, including smart contracts, backend services, APIs, and modern frontend. The ideal candidate has experience in developing ready-to-use blockchain applications and can work with the entire technology stack. Responsibilities - Design and develop the DeFi platform from concept to production. - Develop secure smart contracts using Solidity. - Create backend services using Node.js or NestJS. - Develop responsive frontend applications using React or Next.js. - Integrate Web3 wallets such as MetaMask, WalletConnect, and Coinbase Wallet. - Integrate blockchain networks including Ethereum, Base, Arbitrum, Optimism, Polygon, or BNB Chain. - Develop REST APIs and GraphQL services. - Implement staking logic, token management, and reward distribution where applicable. - Integrate price oracles and blockchain indexing services. - Optimize the performance, scalability, and reliability of the platform. - Write unit and integration tests. - Participate in architecture discussions and code reviews. - Prepare technical documentation. Required Skills - Solidity - Node.js - TypeScript - React.js / Next.js - Web3.js or Ethers.js - REST API / GraphQL - PostgreSQL or MongoDB - Docker - AWS, Google Cloud, or Azure - Git

I'm looking for crypto traders for consultations and recommendations We are a design team building a Kraken-like platform for a client If you have experience with professional trading apps like Kraken - great, I'm really looking for you All we need from you is to join calls and provide feedback on our work (what you feel is lacking, what you would like to add, what annoys you, etc.) On an hourly basis, please also write your rate in a private message. We can discuss the rate, it's not a problem

We're building a regulated real estate tokenization platform that converts institutional-grade properties into ERC-3643 security tokens with built-in ONCHAINID compliance. Our platform enables fractional ownership, secondary trading, and DeFi integration—making premium real estate investment accessible to everyone. I am looking for a talented blockchain $ smart contract developer. Tech Stack: - Blockchain: Solidity (ERC-3643 with ONCHAINID) on Arbitrum One, Hardhat - Backend: Node.js/TypeScript, Express, PostgreSQL, Redis - Frontend: React/TypeScript, ethers.js/wagmi, Tailwind - Infrastructure: AWS, Docker, GitHub Actions Blockchain Developer Responsibilities: - Design and deploy ERC-3643 smart contracts with compliance logic - Implement ONCHAINID identity and KYC whitelist integration - Coordinate external security audits and optimize gas usage - Build DeFi lending integrations (staking, yield, collateralization)

We need to connect a payment system to a high-risk site. The main requirements are the acceptance of fiat funds and the withdrawal of funds in cryptocurrency. Preferably no KYC. Only those who have had similar experience. Price is negotiable.