Blockchain Developer

Websultanate Software Technologies Pvt. Ltd; Lucknow; On-site; INR 1,200,000 - 2,200,000; Full time

Job summary

Websultanate Software Technologies Pvt. Ltd in Lucknow, India is seeking an experienced Blockchain Developer to design and build secure, scalable blockchain infrastructure, wallets, and Web3 integrations.

With 3+ years in blockchain, you will work on multi-chain ecosystems, wallet architectures, and secure key management, deploying across mainnet and testnets. Join a collaborative engineering team focused on secure, production-grade solutions.

Qualifications

• 3+ years of professional blockchain development experience.
• Hands-on experience building production cryptocurrency wallet infrastructure.
• Strong understanding of wallet architecture and transaction lifecycles.
• Experience with multi-chain and cross-chain applications, DeFi, or Web3 platforms.
• Experience with networks including Ethereum, Polygon, BNB Smart Chain, Base, Arbitrum, Solana, Bitcoin, or Tron.

Responsibilities

• Design, develop, and maintain secure blockchain and Web3 applications.
• Build and integrate custodial, non-custodial, HD, MPC, multisig, and multi-chain wallets.
• Implement wallet creation, seed phrase recovery, transaction signing, broadcasting, gas estimation, and monitoring.
• Develop, test, deploy, verify, and maintain smart contracts using Solidity or Rust.
• Manage the complete blockchain deployment lifecycle from local to testnet to mainnet to production monitoring.
• Integrate RPC providers, blockchain nodes, WebSockets, explorers, indexers, WalletConnect, hardware wallets, custody providers, bridges, DEXs, and third-party Web3 APIs.
• Implement blockchain event listeners, balance tracking, transaction monitoring, confirmation handling, nonce management, and chain reorganization handling.
• Design and implement secure key management using KMS, HSM, MPC, multisig, hot/cold wallet architecture, and secrets management.

Skills

Blockchain development

Node.js

TypeScript

Smart contracts

Web3

Security

Wallet architecture

Job description

We are looking for an experienced Blockchain Developer to join our engineering team and build secure, scalable, production-grade blockchain infrastructure. If you have hands-on experience with cryptocurrency wallets, smart contracts, Web3 integrations, and multi-chain ecosystems, we'd love to hear from you.

What We're Looking For

• 3+ years of professional blockchain development experience. Proven experience deploying blockchain applications or smart contracts on mainnet.
• Hands-on experience building production cryptocurrency wallet infrastructure.
• Strong understanding of wallet architecture and blockchain transaction lifecycles.
• Experience with multi-chain and cross-chain applications. Knowledge of blockchain security, smart contract auditing, DeFi, crypto payments, exchanges, or Web3 gaming platforms.
• Experience with one or more blockchain networks including Ethereum, Polygon, BNB Smart Chain, Base, Arbitrum, Solana, Bitcoin, and Tron.
• Strong understanding of BIP-32, BIP-39, BIP-44, cryptography, digital signatures, and secure key management.
• Backend development experience using Node.js and TypeScript.

Key Responsibilities

• Design, develop, and maintain secure blockchain and Web3 applications.
• Build and integrate custodial, non-custodial, HD, MPC, multisig, and multi-chain wallets.
• Implement wallet creation, seed phrase recovery, transaction signing, broadcasting, gas estimation, and transaction monitoring.
• Develop, test, deploy, verify, and maintain smart contracts using Solidity, Rust, or equivalent technologies.
• Manage the complete blockchain deployment lifecycle from local development to testnet to security testing to mainnet to production monitoring.
• Integrate RPC providers, blockchain nodes, WebSockets, explorers, indexers, WalletConnect, hardware wallets, custody providers, bridges, DEXs, and third-party Web3 APIs.
• Implement blockchain event listeners, balance tracking, transaction monitoring, confirmation handling, nonce management, and chain reorganization handling.
• Design and implement secure key management using KMS, HSM, MPC, multisig, hot/cold wallet architecture, and secrets management.