Senior Blockchain Engineer

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 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 develop scalable, secure, and reliable blockchain infrastructure that handles real users and real money

Own the architecture and full lifecycle of blockchain transactions, from initiation and signing to execution, confirmation, reconciliation, and recovery

Build and evolve wallet, custody, key management, and transaction infrastructure across on-chain and off-chain systems

Design integrations across different blockchain networks, architectures, consensus models, and transaction models

Develop and integrate smart contracts where applicable, including EVM-compatible ecosystems

Build production-grade solutions for DeFi use cases such as staking, liquidity pools, DEX integrations, and other on-chain financial workflows

Take end-to-end ownership of complex blockchain systems, including security, resiliency, observability, incident response, and operational excellence

Drive architectural decisions and technical direction by balancing security, scalability, reliability, maintainability, and development velocity

Identify technical risks early and design systems that remain safe and recoverable under failure scenarios

Collaborate closely with product, business, security, and engineering teams to turn ambiguous requirements into robust technical solutions

Lead technical discussions, design reviews, and architectural decisions within the team

Mentor engineers through technical guidance, code reviews, feedback, and knowledge sharing

Leverage modern engineering tools, including AI-assisted development, while maintaining high standards for code quality, security, and engineering rigor

What You'll Bring

Strong software engineering experience with a proven track record of designing and operating complex production systems

Deep hands-on experience building and operating production-grade blockchain infrastructure

Strong understanding of blockchain architecture across different ecosystems, including consensus mechanisms, transaction models, finality, reorgs, fees, and network-specific behavior

Experience working with multiple blockchain networks and protocol models rather than a single ecosystem or virtual machine

Strong understanding of wallet architecture, custody models, key management, transaction signing, and blockchain transaction lifecycles

Hands-on experience with HSMs and secure key management infrastructure

Experience with MPC-based custody systems or custody platforms such as Fireblocks is a strong plus

Strong understanding of cryptographic signing workflows, key security, access controls, and security boundaries in production systems

Experience developing, deploying, and operating smart contracts; Solidity experience is a strong plus

Experience with DeFi protocols or use cases such as staking, liquidity pools, DEXs, or similar on-chain financial systems

Strong understanding of both on-chain and off-chain architectures and the trade-offs between them

Strong knowledge of distributed systems, asynchronous processing, idempotency, failure recovery, and data consistency

Experience operating critical production systems with monitoring, alerting, observability, incident response, and post-incident improvement practices

Ability to make sound architectural decisions and reason clearly about trade-offs across security, scalability, reliability, operational complexity, and delivery speed

Ability to independently navigate high-ambiguity problems and drive them from initial concept through production

Strong sense of ownership, accountability, and responsibility for production outcomes

Strong communication skills and the ability to influence technical decisions across teams

Willingness to mentor other engineers and raise the technical bar of the team

Ability to use AI-assisted development tools effectively while maintaining sound engineering judgment and security standards