Junior Java Software Engineer — API Management @ING Hubs Romania

Discover 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

As a Java Software Engineer in the API Management product team, you will help build and operate the API Management platform — the central solution that enables teams across ING to publish, discover, subscribe to, and secure APIs at scale. The platform serves both internal consumers through an API Marketplace and external consumers through a Developer Portal.

Your Day to Day

• Develop and maintain microservices that power the API Management platform, including resource manager controllers, policy engines, and the API registry;
• Build features that enable API producers to publish OpenAPI documents, register services, manage subscriptions, and generate security tokens and manifests;
• Implement and evolve resource definitions, policies (Open Policy Agent / Rego), and controllers that drive the next-generation API Management platform;
• Contribute to the automation of API lifecycle workflows — from publishing and subscription approval to deprecation and retirement;
• Support the authorisation flows for internal services (token-based authentication), web/mobile applications, and external third-party/partner applications (OAuth);
• Participate in Scrum ceremonies (daily stand-ups, sprint planning, retrospectives, refinements) as a contributing member of an Agile team.
• Write clean, testable code and contribute to code reviews, automated testing, and CI/CD pipeline improvements;
• Collaborate with other platform product teams (Authentication, Service Mesh, API Gateway, Automation) to ensure smooth end-to-end integration;
• Contribute to platform documentation and support community channels.

Technology Stack

• Languages & Frameworks: Java, Spring Boot;
• Containers & Orchestration: Kubernetes, Docker;
• CI/CD: Azure DevOps Pipelines;
• API Standards: OpenAPI / Swagger (2.0 & 3.0);
• Policy & Governance: Open Policy Agent (OPA), Rego;
• Event Streaming: Kafka;
• Other: REST APIs, JSON/YAML resource definitions, CLI tooling.

What You'll Bring to the Team

• Bachelor's degree in Computer Science, Software Engineering, or a related field (or equivalent practical experience);
• Familiarity with Java and object-oriented programming principles;
• Basic understanding of RESTful API design and web protocols (HTTP/HTTPS);
• Willingness to learn and grow in a collaborative engineering environment.

Preferred Experience & Skills

• Exposure to Spring Boot or similar Java frameworks;
• Interest in or experience with containerised environments (Docker, Kubernetes);
• Awareness of CI/CD practices and tools such as Azure DevOps Pipelines;
• Understanding of API specifications (OpenAPI / Swagger) is a plus;
• Familiarity with event-driven architectures or messaging systems (e.g., Kafka) is a plus;
• Familiarity with policy-as-code concepts (Open Policy Agent, Rego) is a plus;
• Good communication skills in English; comfortable working in an international, distributed team;
• A curious mindset with eagerness to learn about API governance, security (OAuth, JWT), and platform engineering.

If you want to deep dive into the processing of personal data conducted by ING Hubs Romania during the recruitment process and your rights related to it, read the privacy notices on our website (make sure to scroll until you reach the Data Protection section/ Candidates tab).