Backend Engineer with Security knowhow

Design the future architecture of one of Europe's most innovative banking networks while empowering engineers to do their best work.

Role Summary We are looking for a highly experienced Blockchain Backend Security Engineer with strong security expertise to help build and scale ING's Digital Asset Services (DAS) platform. The role will play a critical part in designing and implementing secure custody and wallet management capabilities for digital assets, integrating with blockchain SaaS platforms and ensuring enterprise-grade security controls across the platform.

This position is part of the initial DAS delivery milestone, focusing on blockchain SaaS integration, wallet management, custody workflows, and secure key lifecycle management.

Work Model At ING Hubs Türkiye, flexibility is more than a benefit—it's part of how we work. Our hybrid way of working is designed to balance collaboration, innovation, and personal flexibility. Team members typically come together at our Vadistanbul office for two days per week during three weeks of the month, while one week each month is fully remote. We also provide additional flexibility throughout August with remote working opportunities, allowing colleagues to remain productive while staying connected with their teams. As part of a globally distributed organization, you'll collaborate with colleagues across multiple ING locations and contribute to solutions used across the bank.

About the Team You will join an international technology organization where ownership, knowledge sharing, collaboration, and engineering excellence are at the heart of everything we do. Our teams design and deliver critical technology platforms that support ING's digital transformation journey. We believe scalable architectures, strong engineering practices, automation, and continuous learning are essential for delivering reliable solutions at scale.

About You

• Bachelor's degree in Computer Engineering, Software Engineering, or a related discipline

• Fluent English communication skills (C1 level or above)

• 5+ years of professional software engineering experience.

• Strong hands-on experience with Java (Java 17+ preferred).

• Experience with Spring Boot and microservice architectures.

• Strong knowledge of RESTful APIs and event-driven architectures.

• Good understanding of container technologies (Docker, Kubernetes).

Preferred Qualifications

• Experience with MPC (Multi-Party Computation) custody solutions.

• Experience integrating institutional custody providers.

• Knowledge of blockchain security and smart contract risks.

• Experience with cloud platforms (Azure preferred).

• Familiarity with ISO 27001, SOC2 and financial security standards.

• Experience working in Agile/Scrum environments.

Key Responsibilities Backend Engineering

• Design, develop and maintain Java-based backend services supporting digital asset operations.

• Build APIs and microservices for wallet administration, asset transfers, transaction signing and custody workflows.

• Develop integration components with blockchain SaaS vendors and custody providers.

• Ensure high availability, scalability and resilience of critical digital asset services.

Security & Cryptography

• Design secure key management processes across the entire key lifecycle.

• Implement integrations with HSMs (Hardware Security Modules), vault solutions and key custody platforms.

• Support cryptographic operations including transaction signing, encryption and secure key storage.

• Apply security-by-design principles throughout application development.

• Conduct security reviews and threat modeling for new capabilities.

Custody & Wallet Management

• Design and implement wallet provisioning and lifecycle management capabilities.

• Build and optimize custody workflows for institutional digital asset operations.

• Support multi-signature and approval workflows.

• Implement controls for segregation of duties and privileged access management.

Platform & DevOps Collaboration

• Work closely with DevOps and Security Engineers to automate secure deployments.

• Contribute to CI/CD pipelines and infrastructure-as-code initiatives.

• Support operational readiness, monitoring and security incident analysis.

Stakeholder Engagement

• Collaborate with architects, blockchain engineers, compliance specialists and product stakeholders.

• Participate in architecture reviews and security assessments.

• Provide technical guidance on secure digital asset platform design.

Preferred Qualifications

• Experience with MPC (Multi-Party Computation) custody solutions.

• Experience integrating institutional custody providers.

• Knowledge of blockchain security and smart contract risks.

• Experience with cloud platforms (Azure preferred).

• Familiarity with ISO 27001, SOC2 and financial security standards.

• Experience working in Agile/Scrum environments.

Equal Opportunity Don't meet every single requirement? Don't let that hold you back. Studies show many talented professionals hesitate to apply unless they meet every qualification. If you're excited about this role and believe you can make an impact, we'd love to hear from you.

What We Offer at ING Hubs Türkiye At ING Hubs Türkiye, we believe that your work should be fulfilling in every way. We pay attention to even the smallest details to ensure that your experience is rewarding. Be Yourself, Be an ING'er

• Welcome Leave: Enjoy 14 days of welcome leave, even in your first year

• Self-driven career opportunities

• Challenging projects and continuous learning opportunities

• Flexible hybrid working model

• Remote working opportunities throughout August

• Training budget and Udemy partnership

• Global mobility and international career opportunities

• Comprehensive health insurance for you and your family

• Private Pension Plan

• Meal Card

• Transportation Allowance

• MultiSport Membership

• English Language Development Support

• Innovation culture powered by PACE methodology

• Regular communication activities and celebrations

About ING With 65,000 employees and operations in approximately 40 countries, there is no shortage of opportunities for people with initiative who want to help people take a step ahead in life and in business. Do you want to work at the cutting edge of what's possible and at the same time ensure you work with integrity and hold the customer's interests at heart? Do you want to be surrounded by progressive, inspiring, diverse and supportive colleagues? Then there is no better place to invest your talents than at ING. Join us. Apply today.