Type · System Design
Design a real-time notification system for Wallapop. Users should receive notifications for new messages, price drops on followed items, and new items matching their saved searches. Consider delivery guarantees and scalability.
How to Pass the Wallapop Software Engineer Interview in 2026
Growth · Software Engineer Interview Guide
Sign up to see ATSHeadquartered in SpainInterview language: Spanish
The Wallapop DNA (TL;DR)
Wallapop's core loop for 'Inizia a vendere' evaluates how candidates optimize for user conversion and engagement, specifically looking for pragmatic solutions that scale across diverse product categories like 'Telefonia e Accessori'.
The Wallapop 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 Wallapop interview outcomes, avoid these common traps:
- Using a naive approach of querying all items in the region and sorting.
- Not defining a clear similarity threshold or metric.
- Hardcoding decay factors or weights instead of making them configurable.
- Not addressing message queuing, fan-out, or persistence for notifications.
Test Yourself: Real Wallapop Questions
Three real prompts pulled from our database.
Type · Algorithmic
Design a data structure that supports efficiently finding the median price of items listed within a specific geographical region. Assume items have latitude and longitude.
Type · Behavioral
Tell me about a time you had to make a significant technical decision with incomplete information. What was the situation, what decision did you make, and what was the outcome?
+ many more questions, signals, and worked examples
Sign up to unlock the full Wallapop grading rubric
Wallapop Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
9 of 14 questions shown
1
Recruiter Screen
1- 1
Type · Motivation
Why are you interested in working at Wallapop, and what specifically about our mission in the circular economy and second-hand market appeals to you as a software engineer?
2
Coding Screen
3- 2
Type · Algorithmic
Given a list of user-uploaded items with their prices and upload timestamps, write a function to find the top K most frequently viewed item categories within a given time range. Assume you have access to a stream of item view events. - 3
Type · Algorithmic
Implement a function to detect duplicate items in a user's listings based on a combination of title, description, and price, considering minor variations. For example, 'iPhone 13 Pro 128GB' and 'iPhone 13 Pro - 128 GB' should be considered duplicates. - + 1 more questions in this round (sign up to unlock)
3
System Design
4- 4
Type · System Design
Design a system to recommend similar items to users based on their browsing history and purchase patterns on Wallapop. Consider scalability for millions of users and items. - 5
Type · System Design
Design a real-time notification system for Wallapop. Users should receive notifications for new messages, price drops on followed items, and new items matching their saved searches. Consider delivery guarantees and scalability. - + 2 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 6
Type · Coding
Write a function to efficiently calculate the 'local popularity' score for items in a given category and region. The score should consider the item's age, number of views, and number of favorites, with a decay factor for older items. - 7
Type · Coding
Implement a rate limiter for API requests to protect Wallapop's backend services. The rate limiter should allow a configurable number of requests per user per time window (e.g., per minute). - + 1 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
3- 8
Type · Behavioral
Tell me about a time you had to make a significant technical decision with incomplete information. What was the situation, what decision did you make, and what was the outcome? - 9
Type · Behavioral
Describe a complex bug you encountered in a large codebase, like Wallapop's. How did you approach debugging it, what tools did you use, and what did you learn from the experience? - + 1 more questions in this round (sign up to unlock)
Unlock all 14 Wallapop 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 Wallapop
How Wallapop's DNA translates across functions. Pick your role.
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Practice Wallapop interviews end-to-end
Wallapop Mock Interview
Run a live mock interview with our AI interviewer using Wallapop-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Wallapop Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Wallapop interviewers grade on. Reuse them across every behavioral round.
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Wallapop Interview Prep Hub
The frameworks behind every Wallapop 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 Wallapop 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 Wallapop interview questions shows.
Design a real-time notification system for Wallapop. Users should receive notifications for new messages, price drops on followed items, and new items matching their saved searches. Consider delivery guarantees and scalability.
A strong answer shows: Understanding of message queuing systems.; Design for high availability and fault tolerance.; Scalability considerations for concurrent users and messages.; Choice of appropriate communication protocols..
Design a data structure that supports efficiently finding the median price of items listed within a specific geographical region. Assume items have latitude and longitude.
A strong answer shows: Knowledge of spatial data structures.; Efficient median finding (e.g., two heaps).; Integration of spatial queries with median maintenance..
Frequently asked questions
How long does the Wallapop interview process take?
Most candidates spend between 4 and 8 weeks from recruiter screen to offer. The onsite loop itself runs in a single day or is split across two half-days, with debrief and offer typically within 5 business days after.
How should I prepare specifically for Wallapop?
Focus on three things: (1) the company DNA shown above - what they actually grade for, (2) the rounds in your loop, especially the round most candidates underestimate, and (3) drilling on the question types in this guide using a structured framework like CIRCLES or STAR.
Does this apply to engineering or design roles at Wallapop?
The DNA stays the same - what changes is the round mix. SWE candidates face coding screens instead of Product Sense; designers face portfolio reviews and design exercises. The "what they value" and behavioral signals carry across all functions.
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