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Fiverr Pro
English
$
USD
I will develop, fix, or upgrade smart contracts
Professional Blockchain Developer Production Ready Builds
Hi, I’m Judit — a developer focused on Web3, blockchain platforms, crypto payments, NFT systems, and automation. I build practical, real-world solutions that actually work, not just theory.
I’ve work...
About this Gig
Need a reliable smart contract developer for your blockchain project?
I build secure, clean, and production-ready smart contracts for a wide range of use-cases, and I can also troubleshoot or upgrade your existing contracts.
What I can do:
- Custom token contracts (ERC20, ERC721, ERC1155, SPL)
- NFT minting contracts & collection logic
- Marketplace smart contracts
- Staking, vesting, and reward systems
- Airdrop & claim contracts
- DAO voting and governance
- Solana programs using Anchor
- Contract troubleshooting & bug fixing
- Contract upgrades & gas optimization
Networks I work with:
Ethereum Polygon Binance Smart Chain Arbitrum Avalanche
Solana (Anchor) Starknet
Custom EVM Chains
Tech I use:
Solidity Hardhat Foundry
Solana/Anchor Cairo
ethers.js web3.js
I focus on secure, transparent development and will walk you through the entire flow so you know exactly how your contract works.
Message me before ordering so we can discuss your requirements.
Keep your assets and information safe
Cryptocurrency services focus solely on developing and programming. Never share sensitive information or private keys with others.
Other Blockchain Development & Solutions Services I Offer
FAQ
Do I get full ownership of the contract?
Yes, you get complete source code rights.
Can you deploy on testnet and mainnet?
Yes, I can deploy to any EVM chain or Solana devnet/mainnet.
Do you provide audits?
I perform internal security checks. For full audits, I help prepare the code for third-party audits.
Can you upgrade or fix my current contract?
Yes, I can review your code and patch issues or extend functionality.
Will you help integrate the contract with the frontend?
Yes, Premium package includes integration support.
