Senior Blockchain Engineer

Job description

At Midas, we are working on real-life engineering challenges to transform the world of finance. We’ve transformed investing in Turkey by delivering a seamless experience for everyday investors. Today, 4.5 million users invest with Midas. Backed by an $80M Series B, the largest fintech investment ever in Turkey, we are scaling faster than ever. ### What You'll Do - Design and operate secure blockchain systems that handle customer assets - Own on-premises custody architecture, including HSM-backed key management, transaction signing, access controls, redundancy, backups, and disaster recovery - Lead custody integrations and migrations while maintaining security and transaction continuity - Develop, deploy, and maintain production-grade smart contracts and DEX integrations - Build multi-chain transaction infrastructure across EVM-compatible networks, Solana, and other non-EVM ecosystems - Build and operate RPC integrations, blockchain nodes, indexers, reorg-aware chain listeners, and on-chain data pipelines - Own the transaction lifecycle from policy checks and signing through confirmation, reconciliation, and recovery - Establish strong practices for observability, incident response, operational security, and failure recovery - Work closely with product, security, and engineering teams to deliver reliable financial infrastructure ### What You'll Bring - Strong software engineering experience building and operating critical production systems, ideally in financial services, digital assets, brokerage, or exchange environments - Hands-on experience with RPC integrations, node operations, indexers, chain listeners, wallets, custody systems, and transaction signing - Experience designing, operating, or migrating on-premises custody infrastructure using HSMs - Strong knowledge of key lifecycle management, cryptographic signing, access controls, backup strategies, and disaster recovery - Production experience across both EVM-compatible and non-EVM networks, ideally including Solana - Experience developing and operating smart contracts; strong Solidity knowledge is expected, while Rust or Solana development experience is valuable - Experience integrating DEXs, DeFi protocols, or other on-chain financial workflows - Understanding of node synchronization, RPC reliability, transaction models, finality, reorg handling, backfills, fees, and network-specific failure scenarios - Knowledge of distributed systems, asynchronous processing, idempotency, data consistency, and observability - Ability to independently own complex, security-sensitive projects from design through production