Senior Blockchain Engineer: Custody & Multi-Chain Systems

Midas; Turkey; On-site; TRY 900,000 - 1,400,000; Full time

Job summary

Midas is building real-life engineering challenges to transform finance. We are simplifying investing in Turkey and have scaled to millions of users with a strong Series B backing.

We seek a senior engineer to design and operate secure custody and on-chain infrastructure, including multi-chain setups, DEX integrations, and production-grade smart contracts. You will collaborate with product, security, and engineering teams to deliver highly reliable financial infrastructure.

Qualifications

• Strong software engineering experience in financial services, digital assets, brokerage, or exchange environments.
• Hands-on RPC integrations, node operations, indexers, wallets, custody systems, and transaction signing.
• Experience with on-prem custody infrastructure using HSMs and key management.
• Knowledge of key lifecycle management, cryptographic signing, access controls, and disaster recovery.
• Production experience across EVM-compatible and non-EVM networks (Solana is a plus).
• Experience developing and operating smart contracts; strong Solidity knowledge; Rust/Solana is valuable.
• Experience integrating DEXs, DeFi protocols, or other on-chain workflows.
• Understanding of node synchronization, RPC reliability, finality, and failure scenarios.
• Knowledge of distributed systems, asynchronous processing, idempotency, and observability.

Responsibilities

• Design and operate secure blockchain systems that handle customer assets.
• Own on-premises custody architecture with HSM-backed key management, signing, access controls, backups, and DR.
• 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, chain listeners, and on-chain data pipelines.
• Own the transaction lifecycle from policy checks and signing through confirmation, reconciliation, and recovery.
• Establish observability, incident response, operational security, and failure recovery practices.
• Work with product, security, and engineering teams to deliver reliable financial infrastructure.

Skills

Blockchain engineering

RPC integration

Node operations

Solidity

On-prem custody

HSMs

Smart contracts

DeFi / DEX integration

Cryptography

Distributed systems

Job description

Midas is building real-life engineering challenges to transform finance. We are simplifying investing in Turkey and have scaled to millions of users with a strong Series B backing.

We seek a senior engineer to design and operate secure custody and on-chain infrastructure, including multi-chain setups, DEX integrations, and production-grade smart contracts. You will collaborate with product, security, and engineering teams to deliver highly reliable financial infrastructure.