Snapchat interview questions

Showing 61–90 of 94 results

• Explain median vs mean for L1/L2Medium

  This question evaluates understanding of central tendency and loss functions—specifically the roles of median and mean under L1 (absolute) and L2 (squared) norms—and the geometric extension of these concepts to two-dimensional data.

  SnapchatSoftware EngineerStatistics & MathTechnical Screen
• Find Duplicate Files with a Hand-Written Directory TraversalMedium

  This problem tests iterative directory traversal techniques, efficient file hashing strategies to handle large data, and the ability to manage edge cases like file system inconsistencies or symbolic links.

  SnapchatSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Find K Nearest PointsMedium

  This question tests the ability to efficiently find the k-closest points to an origin in a 2D plane, focusing on heap-based or selection-based data structures.

  SnapchatMachine Learning EngineerCoding & AlgorithmsOnsite
• Find Maximum Island PerimeterMedium

  This problem tests grid traversal techniques (DFS/BFS) and the ability to calculate boundary contributions within a connected component in a 2D matrix.

  SnapchatSoftware EngineerCoding & AlgorithmsTechnical Screen
• Find Shortest Clear Grid PathMedium

  Solve the shortest clear path in an n by n binary grid using BFS in 8 directions. Covers blocked endpoints, visited marking, path length, correctness, complexity, and weighted-move follow-ups.

  SnapchatMachine Learning EngineerCoding & AlgorithmsOnsite
• Find all quadruplets summing to targetMedium

  This problem tests your ability to optimize nested loops using a two-pointer approach to achieve a time complexity better than brute force when searching for subsets of a fixed size that sum to a target value.

  SnapchatMachine Learning EngineerCoding & AlgorithmsOnsite
• Find index of first unique characterMedium

  Find index of first unique character evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  SnapchatSoftware EngineerCoding & AlgorithmsTechnical Screen
• Find max node-value range across componentsMedium

  This problem tests your ability to traverse an undirected graph to identify connected components and perform aggregations over the nodes within each component.

  SnapchatSoftware EngineerCoding & AlgorithmsTechnical Screen
• Find the Smallest Range Covering K Sorted ListsHard

  Tests multi-pointer tracking and priority queue fundamentals to find the narrowest bounding interval containing at least one element from each of k sorted lists.

  SnapchatMachine Learning EngineerCoding & AlgorithmsTechnical Screen
• Find top co-purchased productsMedium

  This question evaluates algorithmic problem-solving and data engineering skills, focusing on computing and ranking co-occurrence frequencies, choosing efficient data structures for pairwise counts, and contrasting offline batch implementation with streaming updates.

  SnapchatSoftware EngineerCoding & AlgorithmsOnsite
• Handle cards, islands, Trie, medianMedium

  These problems evaluate proficiency in core data structures and algorithmic problem-solving, covering grouping/counting techniques, grid-based island detection, trie (prefix tree) design, and streaming median computation within the domain of data structures and algorithms.

  SnapchatSoftware EngineerCoding & AlgorithmsTechnical Screen
• How do you deliver when time is tight?Medium

  This question evaluates a candidate's project management, prioritization, risk identification, trade-off negotiation, and stakeholder-communication skills when working under aggressive deadlines.

  SnapchatSoftware EngineerBehavioral & LeadershipTechnical Screen
• How to Update Bayesian Model for Concept Drift?Medium

  How to Update Bayesian Model for Concept Drift? evaluates statistical assumptions, formulas, estimation strategy, uncertainty, edge cases, and interpretation in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  SnapchatData ScientistStatistics & MathOnsite
• Implement LRU cache and prime products arrayHard

  This question evaluates proficiency in implementing efficient mutable data structures and in enumerating combinatorial results, specifically testing understanding of LRU cache eviction behavior and generation of all non-empty subset products from a set of primes.

  SnapchatSoftware EngineerCoding & AlgorithmsOnsite
• Implement a Leaky Bucket LimiterHard

  This problem tests your ability to implement a thread-safe rate limiter using the Leaky Bucket algorithm, requiring careful management of timestamps and shared state.

  SnapchatSoftware EngineerCoding & AlgorithmsOnsite
• Implement a Timestamped CounterMedium

  This problem tests your ability to design a data structure that handles time-series data and performs efficient range-based queries using binary search.

  SnapchatSoftware EngineerCoding & AlgorithmsTechnical Screen
• Implement a custom list with iterator and mapMedium

  This problem tests your understanding of linked list internals, the Iterator design pattern, and the application of higher-order functions in a custom data structure.

  SnapchatSoftware EngineerCoding & AlgorithmsTechnical Screen
• Implement a size-bounded LRU cacheHard

  This problem tests your ability to extend the standard LRU cache pattern to support items with heterogeneous 'weights', requiring a data structure that maintains access order while managing a cumulative capacity constraint.

  SnapchatSoftware EngineerCoding & AlgorithmsOnsite
• Implement an iOS scrollable grid with navigationHard

  This question tests the ability to build a responsive, performance-optimized grid interface in iOS using modern frameworks like SwiftUI, focusing on layout constraints, state management, and navigation flow.

  SnapchatSoftware EngineerSoftware Engineering FundamentalsOnsite
• Implement binary search for boundary indexMedium

  This question evaluates a candidate's ability to implement binary search for boundary indices, including correct handling of duplicates, providing iterative and recursive variants, and reasoning about time and space complexity.

  SnapchatSoftware EngineerCoding & AlgorithmsOnsite
• Implement calculator and graph connectivityHard

  This question evaluates proficiency in parsing and arithmetic expression evaluation (including operator precedence and nested parentheses) alongside implementation of disjoint-set (Union-Find) data structures for computing graph connected components.

  SnapchatMachine Learning EngineerCoding & AlgorithmsTechnical Screen
• Implement sin(x) with precision constraintsMedium

  This question evaluates understanding of numerical methods, floating-point arithmetic, and algorithmic implementation in the Coding & Algorithms domain by requiring an approximation of the sine function under explicit error bounds.

  SnapchatSoftware EngineerCoding & AlgorithmsTechnical Screen
• Influence Cross-Functional Teams Without Formal AuthorityMedium

  Evaluates behavioral and leadership storytelling for influencing cross-functional teams without formal authority. Strong answers use specific data science examples, quantify impact, show coachability from feedback, and explain prioritization when leadership, data, and UX point in different directions.

  SnapchatData ScientistBehavioral & LeadershipOnsite
• Maximize correct guesses in a hat line puzzleMedium

  This problem tests your ability to devise a deterministic strategy for a group of people to maximize correct guesses about their own attributes based on observed information from others.

  SnapchatSoftware EngineerCoding & AlgorithmsOnsite
• Parallelize the lock BFS safelyHard

  Parallelize the lock BFS safely evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  SnapchatSoftware EngineerSystem DesignTechnical Screen
• Radar Overlaps and Undetected Crossing of a Rectangular RoomMedium

  Two-part geometry coding problem about circular radars placed inside a rectangular room. For each radar, list every other radar whose coverage overlaps it, then decide whether a point object can travel from the left wall to the right wall without entering any radar's coverage.

  SnapchatSoftware EngineerCoding & AlgorithmsOnsite
• Remove the Maximum Number of Connected StonesMedium

  Determine the maximum number of stones that can be removed from a 2D grid where a stone may only be removed if another stone shares its row or column. This tests graph modeling, connected components, and Union-Find or BFS/DFS traversals.

  SnapchatSoftware EngineerCoding & AlgorithmsTechnical Screen
• Render an Organization Chart and Find Skip-Level PairsHard

  Build and render an organization tree with ordered indentation, infer its root, and return exactly two-level manager-descendant pairs.

  SnapchatMachine Learning EngineerCoding & AlgorithmsOnsite
• Solve Open the Lock BFSMedium

  This question evaluates the ability to model the lock as a state-space and apply graph traversal and shortest-path techniques (breadth-first search) to determine minimal move sequences under constraints.

  SnapchatSoftware EngineerCoding & AlgorithmsTechnical Screen
• Solve Three Algorithmic TasksHard

  This set of three problems evaluates competencies in algorithm design and data structures, specifically efficient range counting on timestamped events, constrained selection/matching from double-sided cards, and merging multiple sorted lists.

  SnapchatSoftware EngineerCoding & AlgorithmsOnsite