Senior Blockchain Engineer

Job description

We are looking for a Senior Blockchain Engineer to design, build, and maintain secure, scalable blockchain-based applications and infrastructure.

You will work on smart contracts, decentralized applications, blockchain integrations, wallet/payment flows, protocol-level features, and backend services connected to Web3 products. You will collaborate closely with product managers, backend engineers, frontend developers, DevOps, security teams, and business stakeholders to deliver reliable blockchain solutions.

A typical week may include designing blockchain architecture, writing and reviewing smart contracts, integrating blockchain networks with existing systems, improving performance and security, debugging production issues, reviewing code, writing technical documentation, and mentoring other engineers.

Responsibilities:

• Design, develop, test, and deploy blockchain applications and smart contracts

• Build secure, scalable backend services for blockchain products

• Integrate wallets, exchanges, payment systems, or blockchain APIs

• Work with EVM-compatible chains and/or other blockchain protocols
  Write clean, maintainable, and well-documented code

• Review smart contracts and backend code for security and performance

• Collaborate with product and engineering teams to define technical requirements

• Optimize transaction costs, latency, reliability, and scalability

• Support audits, security reviews, and production releases

• Stay updated with blockchain, DeFi, Web3, and crypto infrastructure trends

Technologies may include:

Solidity, Ethereum, Polygon, BNB Chain, Arbitrum, Optimism, Web3.js, Ethers.js, Hardhat, Foundry, Node.js, TypeScript, JavaScript, Rust, Go, Python, PostgreSQL, Redis, Docker, Kubernetes, AWS/GCP, CI/CD, and smart contract security tools.

Profile wanted

We are looking for a highly skilled and hands-on Senior Blockchain Engineer with strong experience in blockchain development, smart contracts, backend engineering, and Web3 infrastructure.

The ideal candidate has:

• 5+ years of software engineering experience

• 3+ years of blockchain/Web3 development experience

• Strong experience with Solidity and EVM-compatible blockchains

• Experience building, testing, deploying, and maintaining smart contracts

• Good understanding of blockchain architecture, consensus mechanisms, gas optimization, wallets, tokens, and transaction flows

• Strong backend development skills using Node.js, TypeScript, Go, Rust, Python, or similar technologies

• Experience with Web3 libraries such as Ethers.js, Web3.js, Hardhat, Foundry, or Truffle

• Knowledge of smart contract security best practices and common vulnerabilities

• Experience with DeFi, NFTs, tokenization, staking, bridges, wallets, or crypto payment systems is a plus

• Ability to write clean, secure, scalable, and well-tested code

• Strong problem-solving skills and attention to detail

• Experience working in agile teams and collaborating with product, frontend, backend, and DevOps teams

• Good communication skills in English

• Startup, fintech, crypto, SaaS, or high-growth company experience is a plus

The candidate should be autonomous, proactive, security-minded, and comfortable working in a fast-moving technical environment.