Type · System Design
Design an API rate limiter for a banking application's public API. Consider different strategies (e.g., token bucket, leaky bucket) and how to handle distributed systems.
How to Pass the ING Software Engineer Interview in 2026
The ING Software Engineer interview runs 5 rounds: Recruiter Screen, Coding Screen, System Design, Onsite Coding, and Behavioral / Leadership. JobMentis holds 12 Software Engineer questions for ING, last updated November 10, 2026.
Enterprise · Software Engineer Interview Guide
Sign up to see ATSHeadquartered in NetherlandsInterview language: English
The ING DNA (TL;DR)
ING values a strong sense of ownership and a pragmatic, results-oriented approach to problem-solving. They look for candidates who can demonstrate a clear understanding of business impact and can articulate how their technical contributions drive value for the company and its customers.
The ING Interview Loop
Your onsite loop will typically consist of 5 rounds.
- 1
Round 1
Recruiter ScreenMotivation, role fit, logistics. - 2
Round 2
Coding ScreenLeetCode-medium algorithmic problems under time pressure. - 3
Round 3
System DesignDistributed systems, trade-offs at scale, architecture under constraints. - 4
Round 4
Onsite CodingLeetCode-hard problems, reasoning about defects, code clarity, edge cases. - 5
Round 5
Behavioral / LeadershipPast evidence of ownership, influence, resolving conflict.
The Danger Zone: Top Reasons Candidates Fail
Based on our database of ING interview outcomes, avoid these common traps:
- Not considering cache invalidation strategies, leading to stale data.
- Incorrectly calculating profit by selling before buying.
- Not considering the need for low latency in fraud detection.
- Not detailing the troubleshooting process or the specific technical details.
Test Yourself: ING Interview Questions
Three questions from the ING bank.
Type · Data Structures
Design a data structure that supports adding a number, removing a number, and retrieving the median of all numbers currently in the structure in average O(1) time. Assume numbers can be floating point.
Type · Algorithmic
Given a binary tree where each node represents a financial account balance, write a function to find the maximum sum of balances along any path from the root to a leaf. Handle cases with negative balances.
+ many more questions, signals, and worked examples
Sign up to unlock the full ING grading rubric
ING Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
8 of 12 questions shown
1
Recruiter Screen
1- 1
Type · Motivation
Why are you interested in joining ING as a Software Engineer, and what aspects of our work in financial technology particularly appeal to you?
2
Coding Screen
3- 2
Type · Algorithmic
Given a list of financial transactions, each with a timestamp, amount, and currency, write a function to calculate the total balance for a given currency over a specified time range. Assume timestamps are Unix epoch seconds. - 3
Type · Algorithmic
Implement a function that takes a list of stock prices for a single stock over several days and returns the maximum profit that could have been made by buying and selling the stock once. If no profit can be made, return 0. - + 1 more questions in this round (sign up to unlock)
3
System Design
4- 4
Type · System Design
Design a system to process and store real-time stock market data feeds from multiple exchanges. The system should be able to handle high throughput, provide low-latency access to recent data, and support historical data analysis. - 5
Type · System Design
Design an API rate limiter for a banking application's public API. Consider different strategies (e.g., token bucket, leaky bucket) and how to handle distributed systems. - + 2 more questions in this round (sign up to unlock)
4
Onsite Coding
1- 6
Type · Algorithmic
Given a binary tree where each node represents a financial account balance, write a function to find the maximum sum of balances along any path from the root to a leaf. Handle cases with negative balances.
5
Behavioral / Leadership
3- 7
Type · Behavioral
STARTell me about a time you had to work with a stakeholder (e.g., product manager, business analyst) who had requirements that seemed technically infeasible or detrimental to the system's long-term health. How did you approach the situation, and what was the outcome? - 8
Type · Behavioral
STARDescribe a challenging technical problem you encountered on a past project. What steps did you take to diagnose and resolve it? What did you learn from the experience? - + 1 more questions in this round (sign up to unlock)
Unlock all 12 ING questions, free
No credit card. Every question with its framework, the grading signals interviewers score against, and a worked answer for each.
Interview tracks at ING
How ING's DNA translates across functions. Pick your role.
ING resume and cover letter
Applications to ING go through an applicant tracking system, which parses your resume before a recruiter reads it. Keep the layout plain and describe your skills in the words of the posting. The interviews usually run in English, so send your resume and cover letter in English unless the posting asks for another language. Give each point in the ING DNA above a bullet that proves it.
Check your resume against the ING job posting
Upload your resume with the ING job description to see your ATS score, the keywords you are missing and what to fix before you apply.
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Write your ING cover letter
Drafted from your resume and the ING posting, so it names what you actually did. You edit it before you send it.
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Same DNA, different bar. Browse the closest companies in our database and see how their loops differ.
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Practice ING interviews end-to-end
ING Mock Interview
Run a live mock interview with our AI interviewer using ING-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for ING Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals ING interviewers grade on. Reuse them across every behavioral round.
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ING Interview Prep Hub
The frameworks behind every ING round: CIRCLES for product sense, hypothesis-driven debugging for analytical, STAR for behavioral. Learn each one in 10 minutes.
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Interview Frameworks
CIRCLES, STAR, AARRR, RICE, MECE. The exact frameworks that make ING interviewers nod instead of frown. Step-by-step playbooks with the moves and the pitfalls.
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Sample answers
What a strong answer to these ING interview questions shows.
Design an API rate limiter for a banking application's public API. Consider different strategies (e.g., token bucket, leaky bucket) and how to handle distributed systems.
A strong answer shows: Understanding of distributed consensus/coordination for rate limiting.; Choice of appropriate algorithms and data stores.; Consideration of edge cases like burst traffic and different client types..
Design a data structure that supports adding a number, removing a number, and retrieving the median of all numbers currently in the structure in average O(1) time. Assume numbers can be floating point.
A strong answer shows: Correct implementation and balancing of two heaps.; Average O(1) time complexity for all operations.; Accurate median calculation for both even and odd counts..
Frequently asked questions
How many interview rounds does ING run for Software Engineer candidates?
5 rounds, in this order: Recruiter Screen, Coding Screen, System Design, Onsite Coding, and Behavioral / Leadership.
What does ING look for in Software Engineer candidates?
ING values a strong sense of ownership and a pragmatic, results-oriented approach to problem-solving. They look for candidates who can demonstrate a clear understanding of business impact and can articulate how their technical contributions drive value for the company and its customers.
In which language does ING run its interviews?
ING usually interviews in English.
How many ING Software Engineer interview questions does JobMentis hold?
12 questions across the rounds of the ING loop, last updated November 10, 2026.
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