Javascript Web3 Jobs in United States

Company Description

DX Blockchain Group FZCO is a blockchain development company focused on building decentralized applications, smart contracts, white-label NFT marketplaces, and secure blockchain infrastructure. The company helps businesses turn blockchain technology into practical products through architecture, development, security, deployment, and ongoing technical support.

As demand grows for decentralized finance, tokenized products, digital ownership, smart contract automation, and Web3 applications, DX Blockchain Group is expanding its blockchain engineering capabilities.

Role Description

We are hiring a Blockchain Developer to design, build, test, and maintain smart contracts, decentralized applications, wallet integrations, and blockchain-based products.

This is a full-time technical role intended for developers with direct cryptocurrency or Web3 experience. Candidates should understand how public blockchains, wallets, transactions, gas fees, token standards, decentralized applications, and smart contracts operate in production.

General software development experience without practical blockchain knowledge will not be sufficient for this position.

Candidates must be legally authorized to work remotely from the United States.

Responsibilities

Design, develop, test, deploy, and maintain production-grade smart contracts and decentralized applications

Build blockchain products across DeFi, NFT marketplaces, tokenized assets, wallets, payments, digital ownership, and Web3 infrastructure

Develop secure smart contracts using Solidity and modern Ethereum development frameworks

Integrate frontend and backend applications with blockchain networks, wallets, RPC providers, indexers, and smart contract APIs

Implement token standards such as ERC-20, ERC-721, ERC-1155, permit-based approvals, and upgradeable contract patterns where appropriate

Build wallet connectivity using technologies such as MetaMask, WalletConnect, ethers.js, viem, or web3.js

Write automated unit, integration, fork, and end-to-end tests for smart contracts and blockchain workflows

Review smart contracts for reentrancy, access-control errors, oracle manipulation, arithmetic issues, front-running exposure, signature vulnerabilities, and other security risks

Optimize smart contract architecture and gas usage without compromising readability, maintainability, or security

Work with blockchain explorers, testnets, local nodes, RPC providers, decentralized storage systems, and on-chain data services

Participate in technical architecture discussions, code reviews, documentation, deployment planning, and incident investigation

Monitor protocol upgrades, Ethereum improvement proposals, blockchain security incidents, developer tooling, and emerging Web3 standards

Collaborate with product, design, security, infrastructure, and client-facing teams to translate requirements into reliable blockchain products

Qualifications

Professional experience developing smart contracts, decentralized applications, blockchain infrastructure, or cryptocurrency products

Strong proficiency in Solidity and practical knowledge of the Ethereum Virtual Machine

Experience using Foundry, Hardhat, or another professional smart contract development and testing framework

Experience integrating applications with wallets, smart contracts, RPC endpoints, blockchain explorers, and on-chain data

Understanding of Ethereum transactions, calldata, events, gas, nonces, signatures, private and public keys, contract storage, and transaction finality

Understanding of common smart contract vulnerabilities and secure development practices

Familiarity with DeFi, token standards, decentralized exchanges, liquidity pools, staking, multisignature wallets, bridges, oracles, and governance systems

Proficiency in JavaScript or TypeScript and experience with Node.js

Experience using Git, GitHub, automated testing, pull-request workflows, and continuous integration

Ability to explain previously developed blockchain products, deployed contracts, or meaningful open-source Web3 contributions

Strong debugging, documentation, communication, and problem-solving skills

Preferred Background

Experience deploying and maintaining smart contracts on Ethereum mainnet or established Layer 2 networks

Experience with Base, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, or Solana

Familiarity with OpenZeppelin Contracts, Safe, Chainlink, The Graph, IPFS, Alchemy, Infura, QuickNode, Tenderly, Slither, Mythril, or similar tools

Experience developing DeFi protocols, NFT marketplaces, tokenization platforms, blockchain payments, custody workflows, or wallet applications

Understanding of account abstraction, cross-chain messaging, upgradeable contracts, multisignature governance, zero-knowledge systems, or decentralized identity

Experience performing smart contract reviews, responding to security findings, or working with external auditors

Public GitHub repositories, verified contract addresses, technical writing, hackathon projects, or open-source blockchain contributions

Background in computer science, software engineering, cybersecurity, mathematics, or a related technical discipline

Benefits

Remote work environment for candidates based in the United States

Opportunity to build real blockchain products including smart contracts, dApps, NFT marketplaces, wallets, and tokenized applications

Exposure to blockchain architecture, smart contract security, Web3 infrastructure, DeFi, and digital ownership

Collaborative technical environment involving blockchain engineers, product teams, security specialists, and Web3 professionals

Opportunities for professional development in smart contract engineering, protocol design, blockchain security, and decentralized application architecture

Compensation

Salary range: $90,000 - $95,000 USD per year depending on blockchain engineering experience, smart contract expertise, security knowledge, and production deployment history

Performance-based incentives and additional bonus opportunities may also be available