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Vladislav V.Full-Stack JS / Web3 Engineer

Node.js 8yr.
Web3.js 4yr.
Solana 2yr.
EthereumJS 2yr.
React
...
- Full-Stack Engineer with over 8 years of experience specializing in Web2 and Web3 technologies, blockchain development, and Full-Stack architecture. - Has 4 years of experience working with web3, implementing blockchain solutions using Ethereum, Solana, and smart contracts. - Proven expertise in tokenization, NFT integration, and cryptocurrency transactions for real estate, voluntary donation, and other industries. - Expertise in Node JS, Nest JS, and RESTful APIs, with proficiency in React JS for frontend development. - Strong experience with databases like PostgreSQL, Redis, MongoDB, and DynamoDB. - Well-versed in cloud services, including AWS and GCP, and experienced in container orchestration with Kubernetes. - Proficient in CI/CD using Jenkins, GitHub Actions, Bitbucket Pipelines, and Terraform. - Familiar with Nginx for web server management and ensuring smooth application deployments.
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Seniority Senior
Location Warsaw, Poland
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P

PolinaWeb3 Software Engineer

$3200/month
PHP 5yr.
JavaScript 5yr.
TypeScript 1yr.
Solidity
...
-Software Engineer with 5 years of professional experience, working across eCommerce & retail, Marketplace, Healthcare, Entertainment, Education, and Blockchain, Game domains. -Proficiency in PHP, JavaScript, TypeScript, React - Knowledge of Vanilla JS, Native PHP, PHP-Selenium - Experience working with Web3 marketplaces, nodes, on-chain, and off-chain transactions - Knowledge of Web3, understanding of Abi, Smart Contracts; Tampermonkey, Greasyfork - Knowledge Css3, Bootstrap 4; RPC; GitHub; MySQL - Has a successful track record of developing applications from scratch and optimizing existing systems, evidenced by projects such as a Learning Platform, Event Manager, and a Website for a Coin Game - Computer Science and Software Engineering Foundation
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Seniority Middle
Location Poland
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EW

Eric WangSenior Web3 / Full Stack Developer

React
Ext JS
SOLID
Node.js
Python
...
Engineer with 8 years in Web3 and AI/ML development, specializing in decentralized applications and scalable web platforms using React, Next.js, Laravel, and EVM-based blockchain tech. Proficient in Solidity, Python, Node.js, and Rust, with expertise in smart contracts, Web3.js, and AI integration. Experienced in Agile/Scrum methodologies, CI/CD pipelines, and remote collaboration. Holds a Computer Science degree from University College London and has led projects for Ocean Protocol and major streaming platforms using Next.js for high-performance, SEO-optimized frontends.
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Seniority Senior
Location Denver, United States
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Hire Vadym M., Vetted Front-end JavaScript Developer Developer | Upstaff

Vadym M.Front-end JavaScript Developer

JavaScript 9yr.
React 8yr.
TypeScript
...
  • Front-end JavaScript Engineer with 9 years of commercial experience;
  • 8+ years of hands-on experience with React, and TypeScript, including complex component architectures, shared UI libraries, and micro-frontend approaches using Module Federation;
  • Experience with automated testing, covering unit, integration, and end-to-end tests using Jest, React Testing Library, Cypress, and Playwright;
  • Experience with Next.js, focusing on performance optimization, scalability, and modular application design;
  • Expertise in Web3 and blockchain integrations, including crypto wallets, on-chain data, and decentralized authentication;
  • Background in FinTech and crypto products, delivering secure, user-facing interfaces for wallets, cards, and transaction flows;
  • Experience working and leading within distributed Agile teams, collaborating closely with backend, security, and product stakeholders.
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Seniority Senior
Location Castel San Giovanni, Italy
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JO

Joseph OkoloBackend Engineer

Node.js 2yr.
NestJS 2yr.
RESTful API 2yr.
GraphQL 1yr.
Web3.js 1yr.
...
Experienced Backend Developer with a strong foundation in Computer Science and over 3 years in fintech, Web3, and real estate domains. Proficient in TypeScript, NestJS, PostgreSQL, MongoDB, and blockchain tools such as Web3.js and Ethers.js. Led major projects including Bloomvest V2 migration to PostgreSQL and scalable API design, Trilla's real estate fractional ownership platform, and high-performance blockchain indexers. Skilled in modular architecture, real-time communication via WebSockets, and secure multi-role backend systems, delivering robust, scalable decentralized and centralized applications.
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Seniority Architect/Team-lead
Location Abuja, Nigeria
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T

TinaSolidity Smart Contract Developer

Solidity
...
- Experience working with Solidity; - Good understanding of Blockchain technology; - 3+ years of experience in Smart Contract development; - Deep skills with Hardhat, and Truffle; - Experience working with ethers.js and Web3.js; - Good knowledge of Ethereum, and BNB Chain; - Experience working on dApps, DeFi, and NFT projects; - In-depth abilities in creating and deploying ERC20, ERC721, ERC1155, BEP20, and BEP721 tokens; - Intermediate English.
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Seniority Middle
Location Kazakhstan
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MC

Martin C.Expert Rust/Solidity Smart Contract Blockchain Developer

Rust
Solidity
...
-As a senior Programmer and Blockchain developer, with over 6 years of development, I am an expert in NFT Website, NFT Art Generation, and NFT Marketplace, Solidity, Web3, EVM based network chains, Custom smart contracts, ERC20/721, ERC1155, NFTs, IDO's, Bridges Block explorers, UI Web3 Dapps Integration, IPFS. - Smart Contract Development (Solidity/ Rust/ Anchor Framework/ Cosmwasm) - Cardano smart contract by utilizing CosmWasm smart contract by utilizing Rust CosmWasm. - Solanasmartcontractimprovement(Unittest,Solana-program-library,Solana-web3,Raydiumtradeandorca)by utilizing Rust and Anchor system. - Polkadot Relay Chain using Substrate in Rust programming. - Smart contract advancement in networks (Ethereum, BSC, Matic/Polygon) by utilizing Solidity. - Uniswap V2, V3, Curve (Yearn, Convex), Sushiswap, Quickswap, etc. - Written smart contracts for ERC20, ERC223, ERC721, ERC1155, ICOs, airdrop, Vesting, MultiSig, Wallet, etc - DeFi, Dex protocols - Front-end development with Smart contract integration by utilizing Web3, truffle. React (Redux/Thunk/Saga), Typescript, Node js. - NFT minting website andNFT marketplace development(Create a listing by admin, flat&Crypto payment,Bundle Sale/ Bulk Transfers, Drop)
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Seniority Middle
Location Buenos Aires, Argentina
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SJ

Sergio JaraSenior Full Stack Engineer

JavaScript 5yr.
Swift 5yr.
FDD 5yr.
Node.js
React
...
Software engineer with 9+ years of experience, excelling in full stack development with expertise in JavaScript, Swift, and iOS development. Proven track record of leading successful projects, including winning multiple hackathons and developing robust blockchain-based solutions. Demonstrates strong technical leadership, having managed diverse engineering teams and fostering agile best practices. Well-versed in various technologies like Node.js, React.js, Firebase services, Ethers.js, Web3.js, and AWS, with a solid foundation in computer science from Universidad Nacional del Nordeste. The engineer's proficiency in building scalable systems for music streaming, live video monitoring, and blockchain integration positions them as a valuable asset to any team seeking deep technical expertise and innovative solutions.
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Seniority Senior
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Developers by tech:

Hire MetaMask Developer
Hire MetaMask Developer
Hire TonKeeper Developer
Hire TonKeeper Developer
Hire WalletConnect Developer
Hire WalletConnect Developer
Hire Ethers.js Developer
Hire Ethers.js Developer
Hire Web3.js Developer
Hire Web3.js Developer
Hire Binance Smart Chain Developer
Hire Binance Smart Chain Developer
Hire Tron Wallet Developer
Hire Tron Wallet Developer
Hire Phantom Developer
Hire Phantom Developer

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Europe’s Data Vision: Dataspaces for Zero-Trust AI Infrastructure

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Upstaff builds AI-Driven Data Platform for Environmental Organizations

Bringing 2M+ Wallet Ecosystem to the Next Level Decentralized Operating System.
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Bringing 2M+ Wallet Ecosystem to the Next Level Decentralized Operating System.

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Want to hire Wallets (Integration & Transaction Signing) developer? Then you should know!

Table of Contents

How and where is Cryptocurrency Wallet used?

  • Secure Payment Processing: Secure financial transactions
  • Cryptocurrency Exchanges: Facilitate crypto trading
  • Decentralized Applications: Enable seamless app integration
  • Reward Programs: Manage loyalty points efficiently
  • Identity Verification: Verify user identities securely
  • Token Sales: Conduct token sales smoothly
  • Smart Contracts: Execute automated contract functions
  • Multi-Signature Wallets: Enhance security through multiple signatures
  • Mobile Wallet Integration: Enable mobile payments
  • Cross-Border Transactions: Facilitate international money transfers

Quick Facts about Wallets (Integration & Transaction Signing).

  • Bitcoin Improvement Proposal 32 introduced hierarchical deterministic wallets in 2012.
  • Cryptocurrency projects and blockchain applications commonly use wallet technology.
  • Developing wallet software requires understanding blockchain technology and cryptography.
  • Ethereum is one of the most popular platforms related to wallet development.
  • The first Bitcoin transaction involved buying two pizzas for 10,000 Bitcoins.

TOP Wallets (Integration & Transaction Signing) Related Technologies

  1. Ethereum (Vitalik, 2015)
  2. Hyperledger Fabric (Linux Foundation, 2016)
  3. Ripple (Ryan, Arthur, and David, 2012)
  4. Stellar (McCaleb, Joyce, Kim, 2014)
  5. Cardano (IOHK, 2017)

What are top Cryptocurrency Wallet (Integration & Transaction Signing) instruments and tools?

  • MetaMask: A browser extension by ConsenSys released in 2016
  • Trezor: Hardware wallet by SatoshiLabs released in 2014
  • Ledger Nano S: Hardware wallet by Ledger released in 2016
  • Coinbase Wallet: Mobile wallet by Coinbase released in 2018
  • Trust Wallet: Mobile wallet by Binance released in 2017
  • MyEtherWallet: Open-source wallet released in 2015
  • Exodus: Desktop wallet by Exodus Movement released in 2015
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FAQs on Wallets (Integration & Transaction Signing) Development

What is a Cryptocurrency Wallet Developer? Arrow

A Cryptocurrency Wallet (Integration & Transaction Signing) Developer is a specialist in the Wallets (Integration & Transaction Signing) framework/language, focusing on developing applications or systems that require expertise in this particular technology.

Why should I hire a Wallets (Integration & Transaction Signing) Developer through Upstaff.com? Arrow

Hiring through Upstaff.com gives you access to a curated pool of pre-screened Wallets (Integration & Transaction Signing) Developers, ensuring you find the right talent quickly and efficiently.

How do I know if a Wallets (Integration & Transaction Signing) Developer is right for my project? Arrow

If your project involves developing applications or systems that rely heavily on Wallets (Integration & Transaction Signing), then hiring a Wallets (Integration & Transaction Signing) Developer would be essential.

How does the hiring process work on Upstaff.com? Arrow

Post Your Job: Provide details about your project.
Review Candidates: Access profiles of qualified Wallets (Integration & Transaction Signing) Developers.
Interview: Evaluate candidates through interviews.
Hire: Choose the best fit for your project.

What is the cost of hiring a Cryptocurrency Wallet (Integration & Transaction Signing) Developer? Arrow

The cost depends on factors like experience and project scope, but Upstaff.com offers competitive rates and flexible pricing options.

Can I hire Wallets (Integration & Transaction Signing) Developers on a part-time or project-based basis? Arrow

Yes, Upstaff.com allows you to hire Wallets (Integration & Transaction Signing) Developers on both a part-time and project-based basis, depending on your needs.

What are the qualifications of Wallets (Integration & Transaction Signing) Developers on Upstaff.com? Arrow

All developers undergo a strict vetting process to ensure they meet our high standards of expertise and professionalism.

How do I manage a Wallets (Integration & Transaction Signing) Developer once hired? Arrow

Upstaff.com offers tools and resources to help you manage your developer effectively, including communication platforms and project tracking tools.

What support does Upstaff.com offer during the hiring process? Arrow

Upstaff.com provides ongoing support, including help with onboarding, and expert advice to ensure you make the right hire.

Can I replace a Wallets (Integration & Transaction Signing) Developer if they are not meeting expectations? Arrow

Yes, Upstaff.com allows you to replace a developer if they are not meeting your expectations, ensuring you get the right fit for your project.