Senior Blockchain Security Engineer

ING Hubs Türkiye; Fatih; Hybrid; TRY 600,000 - 900,000; Full time

Job summary

ING Hubs Türkiye seeks a highly experienced Blockchain Security Engineer to design and scale secure custody and wallet management for the Digital Asset Services platform. You will work across integration with blockchain SaaS vendors, HSMs, and cloud environments to enforce enterprise-grade security.

You'll join a globally distributed team, collaborating with engineers and security specialists to build resilient, scalable backend services using Java, Spring Boot, and microservice architectures,

Qualifications

• Bachelor's degree in Computer Engineering, Software Engineering, or 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).

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.

Skills

Java

Spring Boot

REST APIs

Microservices

Event-driven architectures

Threat modeling

Education

Bachelor's degree in Computer Engineering or Software Engineering

Tools

Docker

Kubernetes

Azure

HSM integration

Job description

ING Hubs Türkiye seeks a highly experienced Blockchain Security Engineer to design and scale secure custody and wallet management for the Digital Asset Services platform. You will work across integration with blockchain SaaS vendors, HSMs, and cloud environments to enforce enterprise-grade security.

You'll join a globally distributed team, collaborating with engineers and security specialists to build resilient, scalable backend services using Java, Spring Boot, and microservice architectures,