Blockchain / Web3Startup

Blockchain / Web3 Developer

[Company Name] is looking for a Blockchain Developer to design and build decentralized applications and smart contracts that power our Web3 products. You will write secure, gas-optimized smart contracts, integrate with blockchain networks, and help define our on-chain architecture. This role is ideal for a developer who is passionate about decentralization and wants to build at the frontier of Web3 technology.

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Key Responsibilities

  • Design, develop, and deploy smart contracts on EVM-compatible chains or Solana
  • Build and maintain backend services that interact with blockchain nodes and indexers
  • Write comprehensive smart contract tests and conduct internal security reviews before audit
  • Integrate wallet connections, transaction signing, and on-chain data into frontend applications
  • Optimize smart contracts for gas efficiency and minimize attack surface area
  • Stay current with blockchain ecosystem developments, new protocols, and security advisories
  • Collaborate with product and design teams to translate Web3 concepts into user-friendly experiences

Required Skills & Experience

  • 2+ years of experience developing smart contracts (Solidity, Rust for Solana, or Move)
  • Strong understanding of blockchain fundamentals including consensus mechanisms, transaction lifecycles, and gas models
  • Experience with smart contract development frameworks (Hardhat, Foundry, or Anchor)
  • Proficiency in JavaScript or TypeScript for frontend and tooling integration
  • Knowledge of common smart contract vulnerabilities (reentrancy, front-running, oracle manipulation) and mitigation strategies
  • Experience with Web3 libraries such as ethers.js, web3.js, or wagmi
  • Familiarity with token standards (ERC-20, ERC-721, ERC-1155)

Nice-to-Have

  • Experience with DeFi protocols (AMMs, lending, staking, or bridge mechanics)
  • Familiarity with Layer 2 solutions (Optimism, Arbitrum, zkSync)
  • Knowledge of subgraph development using The Graph
  • Experience with formal verification or smart contract auditing
  • Contributions to open-source Web3 projects or protocol governance

Tech Stack

SolidityHardhatFoundryethers.jsOpenZeppelinThe GraphIPFSTypeScriptAlchemy

What We Offer

  • Competitive salary and equity package
  • Flexible remote or hybrid work arrangement
  • Health, dental, and vision insurance
  • Annual learning and development budget
  • Generous PTO policy

Interview Process

  1. 1Recruiter phone screen (30 min) — role fit and logistics
  2. 2Technical phone screen (45 min) — blockchain fundamentals and smart contract concepts
  3. 3Smart contract exercise — write and test a small smart contract with given requirements
  4. 4On-site or virtual loop (3 hours) — security review exercise, architecture design, and team fit
  5. 5Offer and reference checks

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