Expert Full Stack Engineer (Web3)

TL;DR

Expert Full Stack Engineer (Node.js/React): Building and scaling wallet infrastructure and developer tooling for a digital assets platform with an accent on security, reliability, and scalability. Focus on designing rich frontend experiences, scalable backend APIs, and integrating blockchain technologies to serve millions of users.

Location: Must be based in Ukraine (Remote or Hybrid)

Company

A custom product engineering company that supports multinational organizations and scaling startups in solving complex business challenges.

What you will do

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

Requirements

• 3–5 years of experience building and shipping production-grade, full-stack web applications.
• Strong proficiency with React and TypeScript on the frontend.
• Experience building backend systems and APIs using Node.js and frameworks like Express.
• Ability to work across frontend and backend systems in complex, evolving codebases.
• Interest in fintech and Web3 infrastructure at a global scale.
• Must be based in Ukraine.

Nice to have

• Experience with blockchain technologies (EVM chains, wallets, on-chain integrations).
• Solidity experience for writing, deploying, and testing smart contracts in production.
• Experience maintaining and securing smart contract systems post-deployment.
• Knowledge of various state management solutions in production React applications.
• Experience with security products or other high-sensitivity domains.

Culture & Benefits

• Radical flexibility: choice between remote work or office attendance.
• Comprehensive care including company-paid medical insurance and mental health support.
• Learning and growth via Udemy access, internal meetups, workshops, and company-paid certifications.
• Internal mobility opportunities to explore diverse domains and cutting-edge technologies.
• Collaborative "One Team" culture working alongside top professionals in a friendly environment.