How to Crack Deliveroo Coding Interviews in 2026

Deliveroo’s coding interviews assess your ability to solve practical, scalable problems under pressure. The process typically involves one or two technical rounds focusing on algorithmic problem-solving, often conducted via platforms like HackerRank or in a collaborative IDE. Success hinges on a clear understanding of core data structures and the ability to write clean, efficient code.

By the Numbers — Difficulty Breakdown and What It Means

Based on historical data, Deliveroo’s question distribution is:

• Easy: 1 question (17%)
• Medium: 3 questions (50%)
• Hard: 2 questions (33%)

This breakdown reveals a clear emphasis on intermediate to advanced problem-solving. The single easy question is often a warm-up or a screening filter. The bulk of the interview’s weight lies in the three medium questions, which test your core competency in applying algorithms to real-world scenarios like order routing or data processing. The two hard questions are the differentiators, designed to assess candidates for senior roles or those with exceptional problem-solving skills, often involving optimization or complex system design elements. Your preparation must be weighted accordingly: master mediums to pass, tackle hards to excel.

Top Topics to Focus On

The most frequent topics form the essential toolkit for Deliveroo’s problems.

• Array & String: The foundation for most data manipulation tasks. Master two-pointer techniques and sliding windows.
• Hash Table: The go-to structure for O(1) lookups, essential for frequency counting and duplicate detection.
• Sorting: Often a prerequisite step for more complex algorithms. Understand efficient sorts and how to sort by custom keys.
• Breadth-First Search (BFS): Critical for shortest-path problems in grids or graphs, directly applicable to delivery route optimization.

The Sliding Window pattern is paramount for array/string problems involving contiguous subarrays or substrings, such as finding the longest delivery route without repeats or a maximum sum under constraints.

def max_subarray_sum_fixed(nums, k):
    """Returns max sum of any contiguous subarray of length k."""
    if len(nums) < k:
        return 0
    window_sum = sum(nums[:k])
    max_sum = window_sum

    for i in range(k, len(nums)):
        window_sum = window_sum - nums[i - k] + nums[i]
        max_sum = max(max_sum, window_sum)
    return max_sum

Preparation Strategy — A 4-6 Week Plan

A structured approach is non-negotiable.

Weeks 1-2: Foundation & Core Topics Dedicate each day to one of the top topics (Array, String, Hash Table, Sorting, BFS). For each, study the fundamental patterns (e.g., two-pointer for arrays, adjacency list for BFS) and solve 5-8 LeetCode-style problems, starting with easy and progressing to medium.

Weeks 3-4: Pattern Integration & Medium Mastery Stop studying topics in isolation. Focus exclusively on medium-difficulty problems that combine patterns (e.g., using a hash table within a sliding window). Aim for 2-3 problems daily, prioritizing timed practice. Begin reviewing Deliveroo-specific problems if available.

Weeks 5-6: Hard Problems & Mock Interviews Allocate 60-70% of your time to hard problems, especially those involving graphs (BFS/DFS) and dynamic programming. Use the remaining time for full mock interviews (90 minutes, 2-3 problems) to simulate real pressure. Systematically analyze your mistakes.

Key Tips

1. Communicate Relentlessly: Think out loud. Before coding, state your brute-force approach, then explain your optimization. Interviewers evaluate your thought process as much as your final code.
2. Optimize for Readability First: Write clear, modular code with sensible variable names. You can often mention potential micro-optimizations verbally without cluttering the implementation. Clean code is maintainable code.
3. Validate Input and Edge Cases: Explicitly check for null, empty arrays, single-element inputs, and large values. State these checks. It demonstrates production-level thinking.
4. Practice on a Whiteboard or Plain Text Editor: Do not become reliant on IDE auto-completion. You may be asked to code in a simple text field during the interview.

Master these patterns, follow the plan, and you'll be equipped to handle the algorithmic challenges Deliveroo presents.

Browse all Deliveroo questions on CodeJeet