Senior Full-Stack Engineer, FinTech & Web3

Ciklum; Town of Poland (NY); Remote; USD 120,000 - 180,000; Full time

Benefits offered by this job

Luxmed premium medical package

Udemy access

Language courses

Company-paid certifications

MyBenefit platform

Remote work flexibility

Job summary

Ciklum is seeking a skilled full-stack engineer to design and implement scalable frontend and backend systems powering wallet infrastructure for digital assets. You’ll work across the stack from architecture to deployment, delivering secure and high-impact features in a fast-paced environment.

Join a global team, collaborate with product and design, and contribute to performance, reliability, and security improvements while exploring fintech and Web3 at scale.

Qualifications

• 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.

Responsibilities

• 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.

Skills

Full-stack development

Node.js

Express.js

React

API design

Blockchain / Web3

Solidity

Security focus

Cross-functional collaboration

Tools

Express.js

Solidity tooling

Web3.js

Job description

Ciklum is seeking a skilled full-stack engineer to design and implement scalable frontend and backend systems powering wallet infrastructure for digital assets. You’ll work across the stack from architecture to deployment, delivering secure and high-impact features in a fast-paced environment.

Join a global team, collaborate with product and design, and contribute to performance, reliability, and security improvements while exploring fintech and Web3 at scale.