Senior Full-Stack Engineer (Node.js + React) with Web3 experience

Summary

Digital asset security platform that helps financial institutions protect digital assets from theft or hackers by using breakthrough MPC & patent-pending chip isolation technology to secure private keys, API credentials and eliminate the need for deposit addresses.

• Expert Full-stack and 1 Senior full-stack: Wallet and FinApps team
• Locations ONLY: Ukraine, Bulgaria, Czechia, Poland, Romania, Slovakia
• B2B Direct Hire Contract (no subcontracts)

About Us

We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges.

With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.
 

Responsibilities:

• Design and implement rich frontend experiences and scalable backend services that power the client’s wallet infrastructure through the Dynamic platform
• Own features across the stack: from technical design and architecture through implementation, testing, deployment, and ongoing optimization
• Build and maintain backend services and APIs supporting authentication, wallets, and payments infrastructure
• Develop user-facing features and frontend tooling for both end-user and developer-facing applications
• Collaborate closely with Product, Design, and other engineering teams to deliver robust, high-impact features
• Contribute to performance, reliability, and scalability improvements across the platform
• Help uphold engineering best practices through code reviews, testing, documentation, and knowledge sharing
   

Must Have Requirements

• 5+ years of experience building and shipping production-grade full-stack web applications
• Node.js: Experience building backend systems and APIs using Node.js (and frameworks such as Express)
• React: Strong experience with React and TypeScript on the frontend
• Experience with blockchain technologies (e.g., Web3, EVM chains, wallets, on-chain integrations)
   

Nice to Have

• Solidity (other smart contract) experience – writing, deploying, testing, or interacting with smart contracts in production environments
• Experience in maintaining, testing, and securing smart contract systems post- deployment