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
The Wallapop Software Engineer interview runs 5 rounds: Recruiter Screen, Coding Screen, System Design, Onsite Coding, and Behavioral / Leadership. JobMentis holds 14 Software Engineer questions for Wallapop, last updated October 23, 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: Wallapop Interview Questions
Three questions from the Wallapop bank.
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
STARTell 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
STARTell 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
STARDescribe 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.
Wallapop resume and cover letter
Applications to Wallapop 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 Spanish, so send your resume and cover letter in Spanish unless the posting asks for another language. Give each point in the Wallapop DNA above a bullet that proves it.
Check your resume against the Wallapop job posting
Upload your resume with the Wallapop 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 Wallapop cover letter
Drafted from your resume and the Wallapop posting, so it names what you actually did. You edit it before you send it.
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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 many interview rounds does Wallapop run for Software Engineer candidates?
5 rounds, in this order: Recruiter Screen, Coding Screen, System Design, Onsite Coding, and Behavioral / Leadership.
What does Wallapop look for in Software Engineer candidates?
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'.
In which language does Wallapop run its interviews?
Wallapop usually interviews in Spanish.
How many Wallapop Software Engineer interview questions does JobMentis hold?
14 questions across the rounds of the Wallapop loop, last updated October 23, 2026.
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