Expert JavaScript Engineer

About the role

As an Expert JavaScript Engineer you will join a cross‑functional team building next‑generation digital‑asset experiences. The role focuses on creating secure, scalable wallet infrastructure for fintech and Web3 clients, while collaborating closely with product and design partners.

Key responsibilities

• Design and implement rich frontend experiences and scalable backend services powering the wallet infrastructure.
• Own features across the stack, from technical design and architecture through implementation, testing, deployment, and optimization.
• Build and maintain backend services and APIs for authentication, wallets, and payments.
• Develop user‑facing features and tooling for both end‑users and developers.
• Collaborate with Product, Design and other engineering teams to deliver high‑impact features.

Required profile

• 3–5 years of experience delivering production‑grade full‑stack web applications.
• Proven ability to work across frontend and backend in complex, evolving codebases.
• Strong appreciation for clean, maintainable code and system performance.
• Curiosity about fintech, Web3 and building infrastructure at global scale.

Required skills

• JavaScript, Node.js and Express.
• React and state‑management solutions.
• Experience with blockchain technologies, EVM chains and wallets.
• Solidity for writing, deploying and testing smart contracts.

What we offer

• Competitive salary starting at €3,900 gross.
• Hybrid work model combining office and remote flexibility.
• Access to internal tech events, Udemy, language courses and company‑paid certifications.
• Comprehensive benefits aligned with market standards.