Blockchain Wallet Developer

2+ years

We are building a next-generation crypto wallet (web / browser-extension / mobile) plus a wallet SDK and multi-chain support infrastructure. We are seeking a Wallet Developer who can take ownership of the wallet architecture, implement secure key management and signing flows, integrate with multiple blockchains, and deliver a seamless, secure wallet + SDK for users and partner dApps.

• Wallet Development & Maintenance

• Build and maintain the wallet across platforms (web, browser-extension, mobile).
• Implement secure key management (e.g., HD wallets, encrypted storage).
• Implement signing flows: EIP-155 (transactions), EIP-712 (typed data signing), personal_sign, etc.
• Manage multi-account and multi-asset support: tokens, NFTs, balances, transaction history, indexing.

• Blockchain & RPC Integration

• Integrate RPC endpoints.
• Manage nonce, gas, and chain switching logic.
• Support multiple chains and networks (multi-chain, multi-network support).

• Wallet SDK / Provider API for dApps

• Develop a wallet SDK / provider API to expose wallet functionality to external dApps (e.g.: eth_requestAccounts, eth_sendTransaction, eth_signTypedData, event subscriptions, etc.).
• Support modern wallet-connect standards (e.g., WalletConnect v2 or equivalent).

• Security & Best Practices

• Ensure strong security: encrypted key storage, secure signing, sandboxing (especially for browser-based wallet), thorough threat modeling, regular audits.
• Design the architecture keeping security and privacy as first-class concerns.

• Interoperability / External Wallet Integration

• Support integration with external wallets such as MetaMask, Trust Wallet, Coinbase Wallet, OKX Wallet, hardware wallets — enabling smooth multi-chain wallet flows.

• Collaboration & Infrastructure Maintenance

• Collaborate closely with frontend, backend, product, and security teams.
• Write clean, tested, and well-documented code.
• Maintain wallet infrastructure, SDKs, and related components.

• Minimum of 2 years in software development, with demonstrable work on blockchain, wallet, or crypto-related projects being strongly preferred.
• Strong familiarity with blockchain fundamentals (especially EVM-based chains).
• Deep understanding of cryptography relevant to wallets: HD wallets, key derivation, secure storage.
• Comfortable building both UI and infrastructure components for wallets and SDKs.
• Proficiency in relevant programming languages/technologies — e.g., JavaScript/TypeScript, Node.js (or other relevant stack).
• Strong problem-solving skills, security mindset, and ability to work in a team.

• Prior experience working on or contributing to wallets (for example: MetaMask, Trust Wallet, Coinbase Wallet, OKX Wallet, or similar).
• Knowledge of hardware wallet integration, multi-signature wallets, or MPC wallet designs.
• Experience building SDKs or developer libraries, along with writing documentation for them.
• Familiarity with blockchain indexing, on-chain/off-chain synchronization, token and NFT standards, and support for multiple assets.
• Awareness of compliance, security, and regulatory aspects relevant to crypto wallets.