Expert JavaScript Engineer

Ciklum

As an Expert JavaScript Engineer become a part of a cross-functional development team engineering experiences of tomorrow.

Design and implement rich frontend experiences and scalable backend services that power Fireblocks’ 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

3–5 years of experience building and shipping production-grade, full-stack web applications
Experience building backend systems and APIs using Node.js (and frameworks such as Express)
Comfort working across frontend and backend systems in complex, evolving codebases
A strong appreciation for clean, maintainable code and system performance
Experience collaborating cross-functionally with product and design partners
Curiosity about fintech and Web3, and interest in building infrastructure used at global scale

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

Don't forget to mention EuroTechJobs when applying.

Share this Job