DoorDash vs Cisco: Interview Question Comparison

When preparing for technical interviews, understanding company-specific patterns is crucial for efficient study. DoorDash and Cisco both appear frequently in coding interview preparation, with nearly identical total question volumes (87 vs 86). However, the distribution of difficulty and the focus of their problem sets reveal distinct interview philosophies, reflecting their different core businesses—a fast-paced consumer tech platform versus an established enterprise networking giant.

Question Volume and Difficulty

The total number of documented questions is similar, but the difficulty breakdown is the key differentiator.

DoorDash (87 questions: E6/M51/H30) has a significantly more challenging problem set. Over one-third of its questions (30) are tagged as Hard, and the majority (51) are Medium. This skew toward complex problems suggests DoorDash interviews deeply assess algorithmic optimization, edge case handling, and the ability to navigate multi-step logic under pressure. The low number of Easy questions (6) indicates they rarely serve as the primary screening tool.

Cisco (86 questions: E22/M49/H15) presents a more balanced difficulty curve. While Medium questions are still the core (49), there is a substantial pool of Easy questions (22) and a much smaller proportion of Hard problems (15). This distribution is typical of many large, established tech companies, where interviews often start with foundational problems to verify basic competency before progressing to more complex scenarios. The presence of more Easy questions might also indicate their use in initial phone screens or for less specialized engineering roles.

Topic Overlap

Both companies heavily test fundamental data structures, but with a subtle shift in emphasis.

The top four topics for both include Array, String, and Hash Table, underscoring their universal importance. Proficiency in manipulating these structures is non-negotiable for either interview.

• DoorDash's fourth most frequent topic is Depth-First Search (DFS), highlighting a strong emphasis on graph and tree traversal problems. This aligns with real-world platform challenges involving hierarchies, navigation, or state-space exploration (e.g., modeling delivery routes or menu structures).

# Example DFS pattern (Tree)
def dfs(node, target):
    if not node:
        return False
    if node.val == target:
        return True
    return dfs(node.left, target) or dfs(node.right, target)

• Cisco's fourth key topic is Two Pointers. This points toward a notable focus on efficient array and string manipulation—problems involving searching, sorting, palindromes, or subarrays. This technique is foundational for optimizing solutions with linear time and constant space.

# Example Two Pointers pattern
def two_pointers(arr, target):
    left, right = 0, len(arr) - 1
    while left < right:
        current_sum = arr[left] + arr[right]
        if current_sum == target:
            return [left, right]
        elif current_sum < target:
            left += 1
        else:
            right -= 1
    return [-1, -1]

Which to Prepare for First

Your preparation priority should be dictated by your interview timeline and the role's seniority.

Prepare for Cisco first if you are early in your interview practice or targeting a broad range of companies. Its problem set, with a greater emphasis on Easy and Medium fundamentals like Two Pointers, provides a stronger and more general foundation. Mastering these patterns will build confidence and directly apply to a wider variety of technical screens. It serves as excellent preparation for DoorDash's more difficult problems.

Prepare for DoorDash first only if your interview is imminent and you already have a solid grasp of core algorithms. The high density of Hard problems and graph-based questions (DFS) requires dedicated, advanced practice. You need to be comfortable not just with implementing DFS/BFS, but with applying them in novel scenarios, often combined with other techniques like memoization or topological sorting.

In essence, Cisco's pattern is a subset and foundation of DoorDash's. A robust preparation for DoorDash will inherently cover Cisco's focus areas, but the reverse is not reliably true due to the gap in difficulty and graph problem depth. Start with the fundamentals emphasized by Cisco, then layer on the advanced graph and optimization skills required for DoorDash.

For detailed question lists, visit the DoorDash interview guide and Cisco interview guide.