ING Hubs Spain Software Engineer interview questions & guide 2026

The questions below represent the core competencies and technical themes consistently observed across ING Hubs Spain interview processes. Use these to identify patterns in your technical preparation rather than relying on rote memorization.

Java & Spring Ecosystem

These questions test your mastery of core language features and your ability to leverage the Spring Boot framework for enterprise-grade applications.

• How do you manage bean lifecycles and dependency injection in Spring Boot?
• Can you explain the difference between various Java collections and when to use them?

Preparation should be structured around both deep-dive technical knowledge and your ability to articulate your engineering philosophy. Focus on moving beyond just "knowing" a technology to explaining "why" it is the right tool for a specific problem.

Role-related Knowledge

• You must demonstrate a solid foundation in Java, Spring Boot, and relational databases (SQL).
• Be prepared to discuss the internal mechanics of these technologies, not just their surface-level usage.

Problem-solving Ability

• Interviewers look for how you break down abstract problems.
• Always explain your thought process out loud during coding or design tasks, as this is often more important than the final code snippet.

Culture Fit & Collaboration

• ING prioritizes team players who communicate effectively.
• Prepare examples of how you have collaborated with stakeholders, handled constructive feedback, or mentored others.

The interview process at ING Hubs Spain is generally systematic, focusing on a balance of technical capability and interpersonal fit. You should expect an initial screening followed by a combination of technical deep-dives and behavioral assessments. The process is designed to evaluate not only your current coding skills but also your potential to grow within the bank's specific technical ecosystem.

This visual timeline illustrates the typical progression from an initial HR screening to technical panels and, potentially, a final management discussion. Candidates should interpret these stages as an opportunity to demonstrate both depth and breadth; use the earlier stages to build rapport and the later stages to showcase architectural thinking.

Technical Proficiency

This evaluates your command of the primary tech stack. Strong performance means you can write clean, efficient code and explain the trade-offs of your implementation choices.

Be ready to go over:

• OOP principles and design patterns.
• Java Collections, Strings, and Streams.
• RESTful API best practices and security.

Example scenarios:

• Refactoring a piece of legacy code to improve readability and performance.
• Pair programming on a live, real-world coding problem.

System Design

This area gauges your ability to build services that are maintainable and scalable.

Be ready to go over:

• Database indexing and query optimization.
• Handling asynchronous communication and message queuing.
• Strategies for fault tolerance and circuit breaking.

Example scenarios:

• Designing a loan processing system or a payment service from scratch.
• Explaining how to monitor and debug a distributed system failure.

As a Software Engineer, you will be responsible for the full software development lifecycle. You will translate business requirements into technical specifications, write clean and testable code, and participate in code reviews to ensure quality across the team.

You will often find yourself collaborating with Architects to define system boundaries and with Product Owners to clarify requirements. The work is highly collaborative, and you will be expected to contribute to team rituals, such as daily stand-ups and retrospectives, ensuring that the development process remains efficient and transparent.

A competitive candidate for this position should possess a strong blend of academic knowledge and practical experience in a professional environment.

• Must-have skills: Proficient in Java 8+, Spring Boot, and SQL/Relational Databases. Strong understanding of OOP and clean code practices.
• Nice-to-have skills: Experience with Kafka, Azure/Cloud platforms, CI/CD pipelines, and experience working in a Banking/FinTech domain.
• Experience: Proficiency in English is essential, as the work environment is international and collaborative.

Q: How long does the hiring process usually take? A: While timelines can vary based on the specific team and seniority, the process generally spans a few weeks. It is common to receive feedback after technical rounds within 7 to 10 days.

Q: Is the technical interview very difficult? A: The difficulty is categorized as average to difficult. It is not designed to be a "trick" test but rather an assessment of your professional capabilities and how you approach real-world engineering problems.

Q: Should I expect live coding? A: Yes, most Software Engineer roles at ING Hubs Spain include a live coding or refactoring session. Practice writing code without the crutch of an IDE's auto-complete features.

• Structure your answers: Use the STAR method (Situation, Task, Action, Result) for behavioral questions to keep your responses focused and impactful.
• Be curious: Always have 2–3 thoughtful questions prepared for your interviewers about the team’s current tech challenges or the bank’s vision.
• Own your gaps: If you don't know an answer, be honest. Explain how you would go about finding the answer or what your logical assumption is based on related knowledge.
• Communication is key: In panel interviews, ensure you engage with all interviewers, not just the one who asked the question.

The Software Engineer role at ING Hubs Spain is a challenging, rewarding opportunity to build world-class financial software. By focusing on your core Java and Spring competencies, sharpening your architectural thinking, and preparing clear examples of your past contributions, you can approach these interviews with confidence.

Remember that ING Hubs Spain values engineers who are collaborative, clear in their communication, and dedicated to high-quality output. Use the insights provided here to guide your study, and remember that every interview is a chance to showcase your potential. For further resources and tracking your progress, continue utilizing Dataford. You have the capability to succeed—prepare thoroughly and stay focused on your strengths.