Blockchain Development Services
4x Engineer is a blockchain development company that builds secure, production-ready Web3 products on Ethereum and every EVM-compatible network, including BNB Smart Chain, Polygon, Arbitrum, Optimism, Base and Avalanche. From token launches and NFT platforms to DeFi protocols, presale portals and wallet-connected dApps, we design, develop, test and deploy your blockchain project end to end, with clean, documented code that you fully own.
- Solidity
- EVM
- Web3
- DeFi
Specialities: dApps · Tokens · DeFi · NFTs · Web3
Why work with us
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Security-First Code
Built on OpenZeppelin standards
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Any EVM Network
Ethereum, layer 2s and EVM chains
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Full Ownership
Source code and contracts are yours
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Testnet First
Try everything before mainnet
Blockchain Development Services We Offer
End-to-end Web3 engineering on Ethereum and every EVM-compatible network.
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dApp Development
Full-stack decentralized applications with a fast web interface, wallet login and on-chain logic your users can verify.
- MetaMask, WalletConnect & Coinbase Wallet login
- React / Next.js front ends connected with ethers.js or viem
- Admin dashboards for on-chain settings
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Token Development
Utility, governance and reward tokens built on proven standards, ready for wallets and exchanges.
- ERC-20 / BEP-20 tokens
- Mint, burn, tax & anti-bot options
- Vesting and team allocation contracts
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NFT Platforms
NFT collections, minting websites and marketplaces with royalties and secure metadata.
- ERC-721 & ERC-1155 collections
- Allowlist, reveal & multi-phase minting
- Marketplace listing, bidding & royalties (ERC-2981)
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DeFi Development
Decentralized finance products that move value safely, from staking to swaps and lending.
- Staking & yield farming
- DEX, AMM & liquidity pool integration
- Lending, vaults (ERC-4626) & reward distribution
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Token Presale & Launch
Everything a token launch needs: presale contracts, a claim portal and transparent vesting.
- Presale / ICO / IDO contracts with multiple rounds
- Buy with the native coin or stablecoins
- Claim, refund & vesting portals
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Integrations & Automation
Connect your existing product to the blockchain, or let scripts watch the chain and act for you.
- Crypto payment gateways & on-chain invoices
- Wallet, exchange & blockchain API integrations
- DEX trading bots & Telegram alerts
Supported EVM Networks
We build once and deploy on the chain that fits your users, fees and liquidity: Ethereum, its layer-2 networks and every EVM-compatible blockchain.
- Ethereum Layer 1
- Arbitrum One Layer 2
- OP Mainnet (Optimism) Layer 2
- Base Layer 2
- zkSync Era Layer 2
- Linea Layer 2
- Scroll Layer 2
- Mantle Layer 2
- BNB Smart Chain EVM chain
- opBNB Layer 2
- Polygon PoS EVM chain
- Avalanche C-Chain EVM chain
- Gnosis Chain EVM chain
- Cronos EVM chain
- Sonic EVM chain
Not on the list? If the network runs the Ethereum Virtual Machine (EVM), we can build for it. Every project is deployed and tested on a testnet first, such as Sepolia or BNB Smart Chain Testnet.
How We Build Your Blockchain Project
A clear five-step process from your idea to a live mainnet launch.
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1. Discovery
Share your idea, users and goals. We clarify features, network and token model.
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2. Architecture
We plan contracts, data flow and tech stack, and agree on scope and milestones.
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3. Development
Smart contracts, back end and front end are built in parallel, with regular demos.
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4. Testnet
Automated tests and a complete testnet deployment you can try before launch.
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5. Launch & Support
Mainnet deployment, contract verification and support after go-live.
Built for Security, Speed and Trust
Blockchain code is public and handles real value, so every project is engineered to production standards from the first line.
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Security First
OpenZeppelin libraries, strict access control and reentrancy protection.
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Gas-Optimized Code
Lean contracts that keep transaction fees low for your users.
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Full Ownership
Contracts are deployed from your wallet and you receive the complete source code.
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Clear Communication
Regular updates on WhatsApp and Email, with milestones you can follow.
Blockchain Development FAQ
What is blockchain development?
Blockchain development is the design and programming of applications that run on a blockchain network: smart contracts that hold the rules and funds, plus the websites, dashboards and back-end services that let people use them.
Which blockchain networks do you work with?
We build on Ethereum and every EVM-compatible network, including BNB Smart Chain, Polygon, Arbitrum, Optimism, Base, Avalanche C-Chain, zkSync Era and Linea. One codebase can be deployed on several of these networks.
Do I own the source code?
Yes. You receive the complete source code of the smart contracts and the application, and the contracts are deployed from your own wallet.
Can I test my project before it goes live?
Yes. Every project is deployed to a testnet first, so you can try every feature without spending real funds. We move to mainnet only after your approval.
How long does a blockchain project take?
It depends on the scope: a token is much faster than a complete DeFi platform or NFT marketplace. After the first call we share a clear timeline with milestones.
Do you provide support after launch?
Yes. We stay available on WhatsApp and Email for updates, fixes and new features after your project is live.
Start Your Blockchain Project
Tell us what you want to build. We reply with the next steps.
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