Blockchain Backend Security Engineer - Custody & Wallet

ing; Turkey; Hybrid; TRY 1,200,000 - 1,800,000; Full time

Job summary

ING Hubs Türkiye is seeking a seasoned Blockchain Backend Security Engineer to design and implement secure custody and wallet management for the Digital Asset Services platform. The role emphasizes secure key lifecycle management, integration with blockchain SaaS vendors, and enterprise-grade security controls.

The team operates in a hybrid model at the Vadistanbul office, collaborating with global ING locations.

Qualifications

• 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).

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

Microservices

RESTful APIs

Cloud security

English (Fluent)

Security engineering

Education

Bachelor's degree in Computer Engineering/Software Engineering

Tools

Docker

Kubernetes

Job description

ING Hubs Türkiye is seeking a seasoned Blockchain Backend Security Engineer to design and implement secure custody and wallet management for the Digital Asset Services platform. The role emphasizes secure key lifecycle management, integration with blockchain SaaS vendors, and enterprise-grade security controls.

The team operates in a hybrid model at the Vadistanbul office, collaborating with global ING locations.