Job Position | Company | Posted | Location | Salary | Tags |
---|---|---|---|---|---|
Weekday AI | Delhi, India | $36k - $54k | |||
molecule.xyz | Remote | $76k - $150k | |||
Molecule | New York, NY, United States | $84k - $120k | |||
molecule.xyz | Berlin, Germany | $77k - $105k | |||
Learn job-ready web3 skills on your schedule with 1-on-1 support & get a job, or your money back. | | by Metana Bootcamp Info | |||
Molecule | New York, NY, United States | $72k - $90k | |||
Caiz | Remote | $74k - $84k | |||
Almanak | Remote | $72k - $148k | |||
Appnovation | Remote | $140k - $150k | |||
VanEck | New York, NY, United States | $87k - $93k | |||
EoT Labs GmbH | Remote | $87k - $87k | |||
Improbable | London, United Kingdom | $87k - $93k | |||
Improbable | London, United Kingdom | $81k - $100k | |||
VanEck | New York, NY, United States | $87k - $93k | |||
Molecule | New York, NY, United States | $84k - $120k | |||
Molecule | United States | $72k - $90k |
This role is for one of Weekday’s clients
Salary range: Rs 1500000 - Rs 4000000 (ie INR 15-40 LPA)
Min Experience: 3 years
Location: NCR
JobType: full-time
About the Role:
We are looking for a Senior Blockchain Developer to lead the design, development, and deployment of smart contracts and blockchain infrastructure powering our crypto platform. You will work closely with backend, DevOps, and product teams to create secure, scalable, and production-ready decentralized components that interface seamlessly with the rest of our system.
The ideal candidate has hands-on experience with EVM-compatible chains, understands cryptography and consensus, and has built or audited smart contracts in production environments.
Key Responsibilities:
- Design, develop, and deploy smart contracts (primarily Solidity or Vyper) for features such as staking, token issuance, multi-sig, governance, and trading.
- Integrate on-chain contracts with backend systems and off-chain data using oracles and event listeners (e.g., The Graph, Chainlink).
- Optimize gas usage, ensure contract upgradeability, and maintain test coverage with unit/integration tests using frameworks like Hardhat or Foundry.
- Contribute to wallet integrations, token standards (ERC-20, ERC-721, ERC-1155), and bridging mechanisms across chains.
- Review and audit smart contracts internally and externally, identifying security vulnerabilities and business logic issues.
- Collaborate with product, backend, and frontend teams to deliver blockchain features end-to-end.
- Stay up to date with latest L1/L2 developments, EIPs, and tooling to propose and implement improvements.
Required Qualifications:
- 4+ years of software engineering experience, with 2+ years specifically in blockchain development.
- Strong experience with Solidity, and knowledge of EVM internals, gas optimization, and contract design patterns.
- Familiarity with Ethereum and L2 ecosystems (Polygon, Arbitrum, Optimism, zkSync).
- Proficient with blockchain development tools: Hardhat, Foundry, Truffle, Web3.js, Ethers.js.
- Deep understanding of token standards, DeFi protocols, and on-chain governance.
- Experience with multisig wallets, time locks, oracles, and decentralized identity (DID) frameworks.
- Comfortable working with Git, CI/CD, Docker, and collaborative environments.
Preferred Qualifications:
- Experience working on Layer 1 or Layer 2 protocol development.
- Knowledge of Rust or Golang for work on non-EVM chains (e.g., Solana, Polkadot, Cosmos).
- Contributions to open-source blockchain projects or Ethereum Improvement Proposals (EIPs).
- Experience with zk-rollups, zero-knowledge proofs, or verifiable computation.
- Familiarity with compliance protocols (Travel Rule, KYC/AML on-chain solutions).
- Previous work with hardware wallets and MPC-based signing (Fireblocks, Safe, etc.).
What is ERC20 example?
ERC20 is a standard for fungible tokens on the Ethereum blockchain
Here is an example of an ERC20 token
Let's say we create a new ERC20 token called ABC Token with a total supply of 1,000,000 tokens
Each token will be divisible up to 18 decimal places
To implement the ERC20 standard, we will need to define several functions, including:
- balanceOf(address): Returns the token balance of a specific address.
- transfer(address to, uint256 value): Transfers tokens from the caller's address to the specified address.
- approve(address spender, uint256 value): Approves a specific address to spend a certain amount of tokens on behalf of the caller.
- allowance(address owner, address spender): Returns the amount of tokens approved by the owner that the spender can transfer.
- User1 owns 500,000 ABC Tokens.
- User2 wants to buy 100 ABC Tokens from User1.
- User1 approves User2 to spend up to 100 ABC Tokens on her behalf.
- User2 calls the transferFrom() function with User1's address, his own address, and the value of 100 tokens.
- The transferFrom() function deducts 100 tokens from User1's balance and adds them to User2's balance.