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Fiverr Pro
English
$
USD
I will build erc20, erc721 or custom evm smart contracts
Every line of code matters: SOLID, scalable, secure
Senior Full Stack and Web3 Developer with 11+ years in NodeJS and 5+ in React.
I build scalable, production grade apps with TypeScript, MongoDB, PostgreSQL, Redis and Docker, plus continuous integrati...
About this Gig
I am a senior software engineer with 11+ years building production systems. For the last 4 years I have lived in Solidity: I engineered a Web3 game with an event driven backend and 12 interconnected smart contracts, liquidity and reward pools, a decentralized marketplace, a faucet, a custom ERC20, NFT minting, staking and treasury logic and Chainlink VRF integration. The system is gas optimized and security hardened (roles, pausability, reentrancy guards) and integrated end to end with React and Node.
I bring that battle tested experience to your project. I design and deliver secure, efficient EVM contracts: ERC20, ERC721, ERC1155, mint and burn, pause and role based access, EIP 2981 royalties, Merkle allowlists, vesting and staking basics, upgradeable patterns when needed, and Chainlink integrations.
What you get: clean source using OpenZeppelin, focused tests, deploy and verify scripts, testnet deployment, and concise docs for roles and operations. Networks: Ethereum, Polygon, BNB Chain.
Scope caps:
Basic 1 standard contract.
Standard up to 2 contracts with custom logic and roles.
Premium up to 4 modular contracts, upgradeable optional, stronger tests and a gas report.
Keep your assets and information safe
Cryptocurrency services focus solely on developing and programming. Never share sensitive information or private keys with others.
My Portfolio
FAQ
Do you build the full dApp UI or backend?
No. Contracts only in this gig. UI and backend can be done in a separate gig or custom offer.
Who covers gas and explorer fees?
The buyer covers gas, explorer fees and any third party service costs.
Which networks do you support?
Ethereum, Polygon and BNB Chain. Other EVM networks on request.
Who owns the code?
You do, one hundred percent. I deliver full source code and scripts.
Do you deploy to testnet and mainnet?
Testnet deploy is included. Mainnet deploy and verify is available as an extra.
Do you provide legal or token launch advice?
No. I do not provide legal, financial or marketing advice. You are responsible for compliance in your jurisdiction.
Can you integrate Chainlink?
Yes. Premium includes one Chainlink integration (Price Feeds or VRF). In Basic or Standard it can be added as an extra.
What about security?
I follow OpenZeppelin best practices, access control and safe patterns. A security review report is available as an extra. This is not a formal third party audit.
Can you work under NDA?
Yes. NDA friendly.
Can you help after delivery?
Yes. 30 Day Post Launch Support is available as an extra for fixes and guidance
