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Enterprise · Software Engineer Interview Guide

Interview language: English

How to Pass the Lookfantastic Software Engineer Interview in 2026

The Lookfantastic DNA (TL;DR)

Lookfantastic's 'Worth Over' value proposition drives their hiring, seeking candidates who demonstrate a clear understanding of delivering tangible customer benefits and optimizing e-commerce experiences. They assess for a track record of enhancing user journeys, particularly around subscription models like the Month Subscription Gift Voucher.

The Lookfantastic Interview Loop

Your onsite loop will typically consist of 5 rounds.

  1. 1

    Round 1

    Recruiter Screen
    Motivation, role fit, logistics.
  2. 2

    Round 2

    Coding Screen
    LeetCode-medium algorithmic problems under time pressure.
  3. 3

    Round 3

    System Design
    Distributed systems, trade-offs at scale, architecture under constraints.
  4. 4

    Round 4

    Onsite Coding
    LeetCode-hard, debugging, code clarity, edge cases.
  5. 5

    Round 5

    Behavioral / Leadership
    Past evidence of ownership, influence, resolving conflict.

The Danger Zone: Top Reasons Candidates Fail

Based on our database of Lookfantastic interview outcomes, avoid these common traps:

  • Failing to connect their engineering skills to the retail or beauty industry context.
  • Failing to consider edge cases like out-of-stock items or invalid product IDs.
  • Incorrectly handling date/time comparisons or time zone issues.
  • Focusing only on one type of recommendation (e.g., collaborative filtering) without considering others or hybrid approaches.

Test Yourself: Real Lookfantastic Questions

Three real prompts pulled from our database.

Type · conflict resolution

Tell me about a time you had a significant disagreement with a colleague or manager. How did you approach the situation, and what was the resolution?

Type · system-design

Design a system to handle flash sales for popular products on Lookfantastic. How would you ensure the website remains available and performs well under a sudden surge of traffic, and how would you manage inventory accurately during the sale?

Type · debugging

A customer is reporting that their order history is showing incorrect items, or missing recent orders. Debug this issue, assuming you have access to the order database, user service, and order processing logs.

+ many more questions, signals, and worked examples

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Lookfantastic Interview Question Bank

A sample from our database, grouped by round. Sign up to see the full set.

9 of 15 questions shown

1

Recruiter Screen

1
  1. 1

    Type · motivation

    What interests you about working at Lookfantastic specifically, and how do you see your skills as a software engineer contributing to our mission in the beauty and wellness retail space?
2

Coding Screen

3
  1. 2

    Type · algorithm

    Given a list of product IDs and their corresponding stock levels, and a list of customer orders with product IDs and quantities, write a function to determine which orders can be fulfilled. Assume stock is updated in real-time.
  2. 3

    Type · algorithm

    Implement a function that takes a list of product reviews (each with a rating and timestamp) and returns the average rating for products within a given time window (e.g., last 30 days).
  3. + 1 more questions in this round (sign up to unlock)
3

System Design

3
  1. 4

    Type · system-design

    Design a recommendation engine for Lookfantastic that suggests products to users based on their browsing history, purchase history, and currently viewed items. Consider scalability and personalization.
  2. 5

    Type · system-design

    Design a system to handle flash sales for popular products on Lookfantastic. How would you ensure the website remains available and performs well under a sudden surge of traffic, and how would you manage inventory accurately during the sale?
  3. + 1 more questions in this round (sign up to unlock)
4

Onsite Coding

3
  1. 6

    Type · coding

    Implement a function to calculate the optimal discount percentage for a given product based on its sales history, current stock levels, and competitor pricing. The function should return a discount that maximizes profit while clearing excess stock within a target timeframe.
  2. 7

    Type · debugging

    A customer is reporting that their order history is showing incorrect items, or missing recent orders. Debug this issue, assuming you have access to the order database, user service, and order processing logs.
  3. + 1 more questions in this round (sign up to unlock)
5

Behavioral / Leadership

5
  1. 8

    Type · past_experience

    Tell me about a time you had to make a significant technical decision with incomplete information or under tight deadlines. How did you approach it, what was the outcome, and what did you learn?
  2. 9

    Type · past_experience

    Describe a complex technical challenge you faced on a project. How did you break it down, collaborate with others (if applicable), and what was your specific contribution to overcoming it?
  3. + 3 more questions in this round (sign up to unlock)

Unlock all 15 Lookfantastic questions, free

No credit card. Every question with its framework, the grading signals interviewers score against, and a worked answer for each.

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Interview tracks at Lookfantastic

How Lookfantastic's DNA translates across functions. Pick your role.

Compare Lookfantastic with similar employers

Same DNA, different bar. Browse the closest companies in our database and see how their loops differ.

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