Blockchain Security Ops Engineer

As a Blockchain Security Ops Engineer at ING, you will design, implement, and secure ING's digital asset technology capabilities. You 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 ensure 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 security-critical components for digital asset platforms including wallet infrastructure, key management systems, and custody models
• Collaborate with digital asset engineers, blockchain engineers, architects, cyber security teams, risk, compliance, legal, product owners, and global technology squads
• Apply threat modelling, vulnerability management, and security architecture practices to blockchain and digital asset systems
• Support smart contract security review and implement secure signing and transaction authorization mechanisms
• Ensure platforms meet regulatory requirements and banking compliance standards for production environments

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
• 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
• 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

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
• Hybrid working model with two days per week at the Vadistanbul office during three weeks of the month, with one fully remote week per month
• Additional remote working opportunities 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
• Global mobility and international career opportunities
• Challenging projects and continuous learning opportunities

About ING

ING operates with 65,000 employees across approximately 40 countries, offering opportunities in banking, financial services, and technology. The organization prioritizes integrity, customer interests, and progressive, diverse workplace culture.