Solidity Jobs

I have a bep20 token and require 2 options that both need to be included in the smart contract so users have 2 options to claim tokens: 1) Simple smart contract function on bsc where users send bnb to the contract address and receive project tokens in exchange. 2) Need users to interact with the smart contract by using a web3 function as simple as possible and get a set amount of tokens per claim and I need in this contract to take a small fee on top of gas that is to be deducted when user calls contract to claim tokens. This small fee will be sent to admin wallet for each transaction but this will not include gas (small fee will land in admins wallet each tx). I need for this all to be 1 transaction for the user so they call the contract from my website and metamask,...

I’m spinning up a new Polymarket-based project and want an engineer who already understands the platform’s contract architecture, event flow, and front-end interactions. The end goal is a fully working market—live on a public testnet first—complete with the web interface, settlement logic, and clear documentation so I can keep iterating once our engagement ends. Here’s the kind of help I’m after: • Solidity work to create or extend Polymarket-compatible contracts and run thorough self-audits • Connection points for The Graph, Chainlink, or other oracles the market will rely on • A React/ front end that signs transactions, displays current odds, and shows resolution states in real time • Optional Node/Express (or similar) servi...

Freelancer Needed – Advanced On-Chain Gambling Protocol with Liquidity Pool, Fully Operational Arbitrage Engine, Railway Backend Compatibility, and Optional Complete Automation I am seeking a highly experienced blockchain developer to finalize, secure, and deploy my on-chain Gambling system. The project already has a working base structure (Telegram bot + smart contract framework), but it must now be transformed into a fully operational, production-ready decentralized protocol with sustainable liquidity mechanics, integrated arbitrage logic, and a backend fully compatible with Railway. This is not a basic betting application. The objective is to build a mathematically sound, automated, liquidity-backed on-chain betting system that functions independently and does not require manual...

I need a seasoned blockchain developer to create a full-featured NFT marketplace that runs on Ethereum, Binance Smart Chain, and Polygon. The core flow is straightforward: mint, list, buy, or sell NFTs across the supported chains without leaving the platform. What I expect: • Smart contracts for minting and trading on each network, written in Solidity (or the most efficient language for that chain) and fully verified. • A web interface where users can:  – Create an account via email/password,  – Connect their preferred wallet when they’re ready to transact,  – Mint new NFTs with custom metadata,  – Instantly list or purchase items at fixed price. • Clean, well-documented code plus a brief deployment guide so I ...