Full-Stack Developer (Web3 / Blockchain)

EtherwaveLabs; United States; Remote; USD 140,000 - 210,000; Full time

Job summary

Etherwave Labs is seeking a seasoned Full-Stack Developer with extensive blockchain experience to build production-grade Web3 infrastructure and applications. You will work across the stack from modern frontend interfaces to backend services and on-chain integrations.

The role emphasizes hands-on development with React, Next.js, TypeScript, Node.js, and Solidity, plus integration with EVM networks, wallet connectivity, and secure, scalable architectures in a collaborative environment.

Qualifications

• Extensive hands-on blockchain and Web3 development experience.
• Strong proficiency in JavaScript/TypeScript, React, and Next.js.
• Backend experience with Node.js and frameworks such as Express or Fastify.
• Experience designing REST APIs, working with relational databases, and building scalable backend services.
• Practical experience integrating Solidity smart contracts into full-stack applications.
• Strong understanding of Ethereum, EVM-compatible chains, and token standards such as ERC-20 and ERC-721.
• Experience with libraries and tools such as ethers.js, wagmi, Foundry, or Hardhat.
• Understanding of smart contract security, blockchain transaction failures, gas fees, and event-driven architecture.
• Experience with Git, automated testing, CI/CD, and production deployment workflows.
• Ability to independently troubleshoot complex issues across frontend, backend, and blockchain layers.

Responsibilities

• Develop and maintain full-stack Web3 applications using modern frontend and backend technologies.
• Build responsive, high-performance user interfaces using React, Next.js, TypeScript, and related tools.
• Design and implement backend APIs, business logic, database schemas, and asynchronous processing systems.
• Integrate Solidity smart contracts with frontend applications and backend services.
• Implement wallet connectivity, transaction signing, blockchain event listeners, and on-chain data indexing.
• Work with EVM-compatible networks, token standards, and DeFi protocols.
• Collaborate on smart contract development, testing, deployment, and integration when required.
• Optimize application performance, transaction workflows, API response times, and database queries.
• Implement secure authentication, authorization, and Web3-specific security practices.
• Participate in architecture discussions, code reviews, debugging, and production deployments.
• Ensure code quality, maintainability, scalability, and reliability across the entire technology stack.

Skills

JavaScript/TypeScript

React

Next.js

Node.js

Express

REST APIs

Relational databases

Solidity integration

Web3 / blockchain

CI/CD

Testing

Git

Security best practices

Tools

Foundry

Hardhat

Ethers.js

viem

wagmi

Job description

Etherwave Labs is a blockchain development agency specializing in production-grade Web3 infrastructure, decentralized finance (DeFi) protocols, and secure decentralized applications.

Our team combines strong software engineering expertise with hands-on blockchain development experience to build reliable, scalable, and secure Web3 products. From Solidity smart contracts and liquidity management systems to interactive decentralized applications, we help startups and established businesses turn complex blockchain concepts into production-ready solutions.

We're looking for a Full-Stack Developer with extensive blockchain experience who can work across the entire application stack, from modern frontend interfaces and backend services to smart contract integrations and on-chain data processing.

Responsibilities

• Develop and maintain full-stack Web3 applications using modern frontend and backend technologies.
• Build responsive, high-performance user interfaces using React, Next.js, TypeScript, and related tools.
• Design and implement backend APIs, business logic, database schemas, and asynchronous processing systems.
• Integrate Solidity smart contracts with frontend applications and backend services.
• Implement wallet connectivity, transaction signing, blockchain event listeners, and on-chain data indexing.
• Work with EVM-compatible networks, token standards, and DeFi protocols.
• Collaborate on smart contract development, testing, deployment, and integration when required.
• Optimize application performance, transaction workflows, API response times, and database queries.
• Implement secure authentication, authorization, and Web3-specific security practices.
• Participate in architecture discussions, code reviews, debugging, and production deployments.
• Ensure code quality, maintainability, scalability, and reliability across the entire technology stack.

Required Qualifications

• Strong professional experience as a full-stack developer, with substantial hands-on blockchain and Web3 development experience.
• Strong proficiency in JavaScript/TypeScript, React, and Next.js.
• Solid backend development experience with Node.js and frameworks such as Express or Fastify.
• Experience designing REST APIs, working with relational databases, and building scalable backend services.
• Practical experience integrating Solidity smart contracts into full-stack applications.
• Strong understanding of Ethereum, EVM-compatible chains, transaction lifecycles, wallets, and token standards such as ERC-20 and ERC-721.
• Experience with libraries and tools such as viem, ethers.js, wagmi, Foundry, or Hardhat.
• Understanding of smart contract security, blockchain transaction failures, gas fees, and event-driven architecture.
• Experience with Git, automated testing, CI/CD, and production deployment workflows.
• Ability to independently troubleshoot complex issues across frontend, backend, and blockchain layers.

Nice to Have

• Experience building DeFi applications, decentralized exchanges, liquidity pools, staking systems, or lending protocols.
• Experience with smart contract development and deployment using Solidity.
• Familiarity with blockchain indexing solutions, subgraphs, or custom event-processing pipelines.
• Experience with Layer 2 networks, cross-chain integrations, and bridges.
• Knowledge of Redis, WebSockets, message queues, and other technologies for high-concurrency applications.
• Experience with Docker, cloud infrastructure, and blockchain RPC providers.
• Contributions to open-source blockchain projects or successful participation in Web3 hackathons.

What We Value

We're looking for someone who understands more than just connecting a wallet to a website. The ideal candidate has built real blockchain-powered applications and understands how frontend interfaces, backend services, databases, and smart contracts work together in a production environment.

We value engineers who can take ownership of features, make sound technical decisions, write clean and secure code, and deliver reliable solutions with minimal supervision.