Senior Fullstack Engineer (Web3)

TL;DR

Senior Fullstack Engineer (Web3): Building and scaling infrastructure and developer tooling for digital asset wallets with an accent on React, TypeScript, and Node.js. Focus on designing secure-by-default systems, optimizing performance for high-load fintech applications, and collaborating on complex blockchain-integrated architectures.

Location: Must be based in Bulgaria (Remote)

Company

hirify.global is a global custom product engineering company that supports multinational organizations and startups in solving complex business challenges through innovative technology.

What you will do

• Design and implement rich frontend experiences and scalable backend services for wallet infrastructure.
• Own features across the stack from technical design and architecture to deployment and optimization.
• Build and maintain backend services and APIs supporting authentication, wallets, and payments.
• Develop user-facing features and frontend tooling for end-users and developers.
• Collaborate with Product, Design, and engineering teams to deliver high-impact features.
• Uphold engineering best practices through code reviews, testing, and documentation.

Requirements

• Must be based in Bulgaria
• 3–5 years of experience building production-grade full-stack web applications.
• Strong proficiency with React and TypeScript.
• Experience building backend systems and APIs using Node.js and Express.
• Comfort working across frontend and backend systems in complex codebases.
• Interest in fintech and Web3 infrastructure.

Nice to have

• Experience with blockchain technologies like EVM chains or wallets.
• Solidity experience including writing, deploying, and testing smart contracts.
• Experience with state management in production React applications.
• Background in security products or high-sensitivity domains.

Culture & Benefits

• Regular performance-based salary reviews.
• 25 paid days off (20 vacation days + 5 sick leave days).
• Additional health insurance coverage.
• 100% company-covered Multisport card with family discounts.
• Access to internal mobility programs and tailored education paths including Udemy.