Senior Blockchain Engineer – Smart Contracts & Custody Infrastructure

We are seeking a highly experienced Senior Blockchain Engineer with proven expertise in smart contract development, cryptocurrency token creation, Ethereum infrastructure, and custody-to-wallet transaction execution.

The successful candidate will be responsible for developing and deploying blockchain solutions, auditing and optimizing smart contracts, and troubleshooting complex cryptocurrency transfer operations.

The candidate must have strong hands-on experience with existing proprietary custody systems, smart contract integrations, and Ethereum Mainnet transaction execution.

Location: Dubai, UAE

Experience: 5+ Years

Employment Type: Full-Time / Contract

Industry: Blockchain, Web3 & Digital Assets

• Design, develop, deploy, and maintain smart contracts using Solidity.
• Develop secure and optimized smart contracts on Ethereum and other EVM-compatible networks.
• Debug, test, upgrade, and optimize existing smart contracts.
• Implement access controls, multi signature authorization, and secure contract execution.
• Investigate smart contract execution failures and transaction reverts.
• Integrate smart contracts with custody platforms, wallets, and backend systems.

• Design, develop, and deploy ERC-20 tokens and other applicable token standards.
• Implement token minting, burning, transfers, vesting, and distribution mechanisms.
• Develop token management and administration systems.
• Configure token permissions, ownership, and supply controls.
• Integrate tokens with Meta Mask, Phantom, and other compatible wallets.
• Deploy and verify token contracts on Ethereum Mainnet and supported EVM networks.
• Perform token security testing and smart contract verification.

• Analyze and troubleshoot existing proprietary cryptocurrency custody infrastructure.
• Execute authorized cryptocurrency transfers from custody systems to external wallets.
• Diagnose transaction signing, broadcasting, confirmation, and execution issues.
• Investigate transaction hashes, RPC errors, nonce conflicts, gas issues, and failed transfers.
• Troubleshoot VPS servers, blockchain nodes, APIs, and smart contract integrations.
• Ensure successful and verifiable on-chain transaction execution.

• Configure and manage Ethereum RPC connections and blockchain node integrations.
• Maintain Linux/VPS environments supporting blockchain operations.
• Develop backend integrations using Node.js, Type Script, Python, ethers.js, and web
  3.py.
• Implement secure transaction monitoring and blockchain event tracking.
• Optimize transaction processing, reliability, and system performance.

• Apply secure smart contract development practices.
• Conduct vulnerability assessments and coordinate smart contract audits.
• Implement secure transaction signing and wallet authorization procedures.
• Understand MPC, multigeniture wallets, hardware security modules (HSM), and private-key management.
• Protect digital assets through appropriate access controls and transaction approval procedures.

• 5 +years of relevant blockchain experience.
• Advanced proficiency in Solidity and Ethereum Virtual Machine (EVM).
• Proven experience creating and deploying ERC-20 tokens.
• Strong knowledge of smart contract architecture, testing, and security.
• Demonstrated experience with custody infrastructure and wallet transaction execution.
• Advanced knowledge of Ethereum Mainnet, RPC, transaction lifecycle, and blockchain explorers.
• Proficiency in JavaScript/Type Script, Node.js, Python, ethers.js, and web
  3.py.
• Experience with Hardhat, Foundry, and Open Zeppelin.
• Strong Linux/VPS and API troubleshooting skills.
• Ability to independently diagnose and resolve complex blockchain infrastructure issues.

• 1. Examples of deployed smart contracts
• 2. Verified contract addresses on public blockchain explorers.
• 3. Details of previous custody-to-wallet transfer projects.
• 4. Examples of complex Ethereum transaction issues successfully resolved.
• 5. Relevant Git Hub repositories, technical portfolios, or professional references.

Very competitive salary with attractive bonuses