Front-End Developer

4pto.io; United States; Hybrid; USD 60,000 - 90,000; Full time

Job summary

4pto.io is seeking a mid-level frontend engineer to create user-facing Web3 interfaces across blockchain ecosystems. You’ll collaborate with designers, backend engineers, and blockchain specialists to deliver responsive experiences that connect to APIs and smart contracts.

Responsibilities include building modern interfaces, connecting features to contracts, and improving performance, accessibility, and scalability. Hybrid or remote work is available in international teams.

Qualifications

• At least two years of front-end development experience.
• Basic experience with Web3 technologies and blockchain integration.
• Proficiency in JavaScript or TypeScript and a framework such as React or Next.js.
• Familiarity with Ethers.js, Web3.js, or similar libraries.
• Understanding of how interfaces connect to smart contracts, including contracts built with Solidity or Rust.
• Knowledge of REST APIs or GraphQL, Git, and agile development practices.

Responsibilities

• Build and maintain modern, responsive interfaces for Web3 applications.
• Connect front-end features to smart contracts and APIs.
• Work with designers to implement clear, user-friendly experiences.
• Coordinate with backend and blockchain developers on integration.
• Improve front-end performance, accessibility, and scalability.
• Keep current with tools and frameworks used for Web3 front-end development.

Skills

Front-end development

Web3 familiarity

JavaScript/TypeScript

UI/UX collaboration

Agile processes

Tools

React

Next.js

Ethers.js

Web3.js

REST APIs

GraphQL

Git

Job description

Role overview

Create the user-facing interfaces for decentralized applications across different blockchain ecosystems. You’ll work closely with designers, backend engineers, and blockchain specialists to deliver responsive, accessible experiences that connect smoothly to APIs and smart contracts.

Responsibilities

• Build and maintain modern, responsive interfaces for Web3 applications.
• Connect front-end features to smart contracts and APIs.
• Work with designers to implement clear, user-friendly experiences.
• Coordinate with backend and blockchain developers on integration.
• Improve front-end performance, accessibility, and scalability.
• Keep current with tools and frameworks used for Web3 front-end development.

Requirements

• At least two years of front-end development experience.
• Basic experience with Web3 technologies and blockchain integration.
• Proficiency in JavaScript or TypeScript and a framework such as React or Next.js.
• Familiarity with Ethers.js, Web3.js, or similar libraries.
• Understanding of how interfaces connect to smart contracts, including contracts built with Solidity or Rust.
• Knowledge of REST APIs or GraphQL, Git, and agile development practices.

Benefits and work setup

• Mid-level role with a hybrid or remote arrangement in Bulgaria, Croatia, or Serbia.