Senior Web3 Engineer — Prediction Markets

MetaMask; United States; Remote; USD 132,000 - 221,000; Full time

Job summary

MetaMask is building the operating system for your money with a remote-first, global team. As a Senior Software Engineer on the Predict team, you will help bring prediction market capabilities directly into the wallet, enabling millions of users to interact with markets securely and intuitively.

You’ll design frontend components, build scalable backend services, and ensure seamless on-chain integration, while prioritizing performance, security, and user experience.

Qualifications

• 3+ years working with mobile-based technologies.
• 3+ years building websites and/or applications.
• Experience with React and React Native.
• Strong knowledge of modern Javascript (ES6/TypeScript).
• Familiarity with blockchain fundamentals and Web3 integration.
• Working knowledge of cross platform/browser compatibility.
• Experience working with APIs and middleware services.
• Experience working in an agile development team.
• Experience developing applications with clean code practices, testing, and adherence to coding standards.
• Understanding of web-based security considerations.

Responsibilities

• Design frontend components and user experience for prediction market interactions across MetaMask clients.
• Develop robust backend services and APIs to fetch real-time market data, manage user positions, and facilitate transaction signing.
• Ensure seamless and secure integration with on‑chain prediction market protocols.
• Optimizing the performance and security of all Predict features, handling real‑time data feeds and high‑volume transaction throughput.

Skills

Mobile tech

Web apps

React

JavaScript/TypeScript

Web3 familiarity

Cross platform

APIs & middleware

Agile team

Code quality & tests

Security

Job description

MetaMask is building the operating system for your money with a remote-first, global team. As a Senior Software Engineer on the Predict team, you will help bring prediction market capabilities directly into the wallet, enabling millions of users to interact with markets securely and intuitively.

You’ll design frontend components, build scalable backend services, and ensure seamless on-chain integration, while prioritizing performance, security, and user experience.