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

Blockchain and Cryptography, Full Stack Web (5.0 yr.).

Senior

B2 (Upper-Intermediate)

Required Skills

Solidity

1.0 yr.

Web3

1.0 yr.

Node.js

5.0 yr.

React

5.0 yr.

Nice to Have

Stellar

microservices

Docker

Kubernetes

Helm

Blockchain

3.0 yr.

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) !!!

Are you a talented developer looking for a remote job that lets you show your skills and get decent compensation? Join Upstaff.com, a platform that connects you with hand-picked startups and scale-ups in the US and Europe.

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
- Web3
- EVM chains (Solidity smart contracts, fundamentals)
- No-EVM chains (Solana, Stellar smart contracts, fundamentals)
- 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

How to Apply for Senior Full-Stack Engineer (Node.js + React) with Web3 experience

Be ready for the next steps:

Create your profile on our website (import from LinkedIn)
20-30-minute screening call
Technical interview feedback
Project Selection (we are looking for the best project for you).

Who can apply:

We work with developers across Europe, LATAM, the U.S. (W-9 form owners), Canada, Asia, Oceania, and the UK.
We do not provide visa assistance, and this cooperation model does not include direct-hire benefits.
We cannot accept applicants from Russia, Belarus, Iran, or North Korea.

Apply Now

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