Ing

Overview

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.

About Ing

We're a global bank with a strong European base, and our more than 60,000 colleagues serve around 38 million customers and corporate clients in over 40 countries.

Requirements & Eligibility

• 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)

Key Responsibilities

• 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.
• 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.