Blockchain Ops Engineer

As a Blockchain Ops Engineer at ING, you will help design, implement, and secure ING's digital asset technology capabilities. You will work on security-critical components such as wallet infrastructure, key management, cryptographic controls, custody models, smart contract security, transaction authorization, secure signing, tokenization platforms, and blockchain integrations. Your mission is to make sure ING's digital asset platforms are secure by design, resilient by default, auditable, compliant, and ready for production in a regulated banking environment.

What you'll do

• Design and implement secure digital asset technology capabilities across wallet infrastructure, key management, and cryptographic controls
• Collaborate with digital asset engineers, blockchain engineers, architects, cyber security teams, risk, compliance, legal, product owners, and global technology squads
• Develop and maintain custody models and smart contract security controls
• Build secure transaction authorization and signing infrastructure
• Create and manage tokenization platforms and blockchain integrations

What you bring

• 5+ years of experience in software engineering, solution design, or architecture roles
• A strong background in cyber security, secure software engineering, platform security, or cryptographic systems
• Understanding of blockchain and digital asset fundamentals, including wallets and addresses, public/private key cryptography, digital signatures, transaction signing, smart contracts, tokens, blockchain nodes, and custody models
• Experience with secure coding, threat modelling, vulnerability management, penetration testing, or security architecture
• Strong stakeholder management experience across business and technology domains
• Strong analytical and problem-solving capabilities
• Experience working in Agile organizations
• Bachelor's degree in Computer Engineering, Software Engineering, or a related discipline
• Fluent English communication skills at C1 level or above
• Familiarity with APIs, microservices, event-driven architecture, cloud platforms, containers, Kubernetes, CI/CD, and infrastructure-as-code
• Understanding of IAM, privileged access management, secrets management, encryption, logging, monitoring, and audit trails

Nice to have

• Experience in banking, financial services, payments, capital markets, securities, custody, or wholesale banking
• Experience with digital assets, tokenization, stablecoins, CBDCs, tokenized deposits, or blockchain-based settlement
• Hands-on experience with HSMs, MPC platforms, wallet infrastructure, or custody technology providers
• Experience with smart contract security tools such as Slither, Mythril, Foundry, Echidna, or similar tools
• Knowledge of Ethereum, EVM chains, Hyperledger Besu, Hyperledger Fabric, Corda, Quorum, or permissioned blockchain networks
• Experience with cryptographic protocols, secure enclaves, threshold signatures, distributed key generation, or zero-knowledge proofs
• Experience with security certifications, standards, and frameworks such as ISO 27001, SOC 2, NIST, CIS, OWASP, or cloud security benchmarks
• Security certifications such as CISSP, CCSP, OSCP, GIAC, CEH, cloud security certifications, or blockchain security certifications

What we offer

• 14 days of welcome leave, even in your first year
• Flexible hybrid working model: typically two days per week at our Vadistanbul office for three weeks of the month, with one week fully remote, plus additional remote flexibility throughout August
• Training budget and Udemy partnership
• Comprehensive health insurance for you and your family
• Private Pension Plan
• Meal Card
• Transportation Allowance
• MultiSport Membership
• English Language Development Support
• Self-driven career opportunities and challenging projects with continuous learning
• Global mobility and international career opportunities

About ING

ING is a global financial institution with 65,000 employees operating in approximately 40 countries. The organization invests in cutting-edge technology while maintaining integrity and putting customers' interests at the heart of everything it does.