Software Developer @ING Hubs Romania

ING Hubs Romania offers 130 services in software development, data management, non-financial risk & compliance, audit, and retail operations to 24 ING units worldwide, with the help of over 2000 high-performing engineers, risk, and operations professionals.

We started out in 2015 as ING’s software development hub, then steadily expanded our range to include more services and competencies. Now we provide borderless services with bank-wide capabilities and operate from two locations: Bucharest and Cluj-Napoca.

Our tech capabilities remain the core of our business, with more than 1800 colleagues active in Data and Analytics Tech, Tech Foundation and Channels, Retail Core Banking and Architecture, and Global Products and Technology Services.

We enjoy a flexible way of working and a highly collaborative environment, where fair and constructive feedback is encouraged.

For us, impact isn't a perk. It's the driver of our work. We are guided and rewarded by a shared desire to make the world a better place, one innovative solution at a time. Our colleagues make it their job to do impactful things and they love doing it in good company. Do you?

The Mission

The API SDK is ING's core framework for developing secure, resilient, and high-performance APIs. This role offers the opportunity to work on foundational platforms that power ING's digital banking capabilities across our global technology ecosystem.

API SDK Is a Spring Boot-based Framework That Serves As The Foundation For Developing APIs. It's a Lightweight Layer On Top Of Spring Boot That Configures Beans And Filters Specific To The ING Landscape, Including

• Service registry integration for automatic service registration and discovery
• Pre-configured resilient HTTP client for inter-service communication
• Security components (token validation, access control, and authorization)
• Centralized logging and metrics integration with monitoring platforms
• Service mesh connectivity and proxy support for polyglot architectures

Responsibilities

Even if you start your day from the comfort of your home or drink your morning coffee in our office garden, your day will be quite similar when comes to tasks. Here are your daily responsibilities:

Framework Development & Maintenance

• Develop and maintain core API SDK components.
• Deliver features focused on security, resilience, and observability.
• Ensure backward compatibility while evolving the framework.
• Maintain the toolkit components supporting the platform.

• Integrate with ING infrastructure platforms and services.
• Build and maintain connectivity modules.
• Enable seamless service mesh and discovery integration.
• Support both direct and proxy-based deployments.

• Design user-friendly APIs and configuration interfaces.
• Create clear documentation and implementation guides.
• Develop testing tools for local development and validation.
• Provide reference implementations and best practices.

• Support teams adopting and using the API SDK.
• Review and merge community contributions.

• Languages & Frameworks: Java 17+, Spring Boot, Scala, Maven, Gradle
• Platforms: Kubernetes, OpenShift, Docker, Azure DevOps/GitHub
• Integration: Kafka, REST APIs, Service Discovery
• Observability: Prometheus, Grafana, OpenTelemetry, Logging Platforms
• Security: PKI, Token-Based Authentication, mTLS, API Gateways

What you'll bring to the team

• 5+ years in Java development.
• Experience with microservices and distributed systems.
• Strong communication and documentation skills.

• Framework/SDK development.
• Spring Boot, Kafka, API Gateways.
• OpenAPI, PostgreSQL/Cassandra.
• Financial services or regulated environments.

• Java, Spring Boot, Maven.
• Microservices, service mesh, resilience patterns.
• OAuth2, JWT, PKI, mTLS.
• Docker, Kubernetes, CI/CD.
• Prometheus, Grafana, centralized logging.