Blockchain Backend Engineer

As a Senior Backend Engineer at ING Wholesale Banking, you will design and develop scalable backend services, APIs, integration layers, event-driven applications, and cloud-native platforms that support emerging digital asset and distributed ledger initiatives. You will join an international technology organization where ownership, knowledge sharing, collaboration, and engineering excellence drive everything we do. While prior blockchain experience is welcome, we are primarily looking for strong software engineers passionate about building resilient, secure, and high-performing distributed systems and interested in expanding into the blockchain and digital assets domain.

What you'll do

• Design, build, and operate scalable backend services and APIs
• Develop microservice-based applications running on cloud-native platforms
• Create robust integration solutions between internal banking systems and emerging digital asset platforms
• Build highly available, secure, and resilient services handling financial transactions and business-critical processes
• Participate in architecture discussions covering scalability, performance, security, reliability, and maintainability
• Support the design and implementation of distributed financial platforms
• Contribute to digital asset, tokenization, and blockchain-related initiatives
• Work on transaction workflows, settlement processes, custody integrations, and digital asset servicing capabilities
• Learn and apply distributed ledger technologies where appropriate
• Collaborate with blockchain engineers and architects on selected use cases
• Build automated testing frameworks and CI/CD pipelines
• Apply clean code principles and software craftsmanship practices
• Improve observability, monitoring, logging, and operational resilience
• Support production environments and participate in incident resolution activities
• Contribute to reusable engineering patterns and platform capabilities
• Implement security-by-design principles
• Apply secure coding standards and software development best practices
• Work closely with security, risk, and compliance teams
• Ensure regulatory and internal control requirements are considered throughout solution delivery
• Work in Agile squads with Product Owners, Architects, Business Analysts, SREs, and Security Specialists
• Collaborate with global ING engineering teams
• Share knowledge and contribute to engineering communities, demos, and innovation initiatives

What you bring

• 5+ years of experience in software engineering, solution design, or architecture roles
• Strong stakeholder management experience across business and technology domains
• Excellent communication and presentation skills
• 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 (C1 level or above)
• Strong experience with Java (preferred) or Kotlin
• Strong experience with Spring Boot
• Strong experience with REST APIs
• Strong experience with Microservices Architecture
• Experience with event-driven architectures
• Experience with Kafka
• Experience with RabbitMQ or similar messaging technologies
• Experience with SQL and NoSQL databases
• Experience with containerization (Docker)
• Experience with Kubernetes
• Experience with CI/CD pipelines
• Experience with Git-based development workflows
• Good understanding of distributed systems
• Good understanding of system integration
• Good understanding of API design
• Good understanding of scalability patterns

What we offer

• 14 days of welcome leave, even in your first year
• Self-driven career opportunities and challenging projects
• Continuous learning opportunities and training budget with Udemy partnership
• Flexible hybrid working model: typically two days per week at the Vadistanbul office, with one week per month fully remote, plus additional remote flexibility throughout August
• 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 Wholesale Banking

ING is building digital asset, tokenization, and distributed financial infrastructure capabilities. As part of a globally distributed organization, you will collaborate with colleagues across multiple ING locations and contribute to solutions used across the bank.