Amazon interview questions

Showing 91–120 of 653 results

• Compute reachability and minimal-time same-type schedulingMedium

  This prompt evaluates integer reachability and invariant reasoning via repeated additive transformations (testing number-theoretic reachability and state-space analysis) alongside resource-aware scheduling and grouping logic for minimizing completion time under type and memory constraints, and it falls under the Coding & Algorithms domain.

  AmazonSoftware EngineerCoding & AlgorithmsOnline Assessment
• Compute shortest path with obstaclesMedium

  This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Compute shortest path with obstacles states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  AmazonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Compute the Median After Each Stream InsertionMedium

  This problem tests your ability to maintain dynamic statistics in a data stream using efficient data structures to achieve logarithmic insertion and constant-time retrieval.

  AmazonSoftware EngineerCoding & AlgorithmsOnsite
• Compute the Minimum Number of Meeting RoomsEasy

  This problem tests your ability to manage overlapping time intervals efficiently, requiring an understanding of sorting or priority queues to track resource utilization.

  AmazonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Compute total revenue from greedy VM rentalsMedium

  This problem tests your ability to use greedy strategies combined with efficient data structures to manage resource allocation and optimize revenue based on priority-based demand.

  AmazonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Compute tree diameterMedium

  This question evaluates understanding of binary tree algorithms, recursion versus iterative traversal strategies, and competence in algorithmic analysis including time and space complexity and handling deep-recursion stack overflow when computing a tree's diameter.

  AmazonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Compute unique visitors per department from clicksMedium

  This question evaluates a candidate's skill in data manipulation and deduplication using SQL/Python, specifically mapping hierarchical product metadata to departments and computing unique user counts without double-counting, and is categorized under Data Manipulation (SQL/Python).

  AmazonSoftware EngineerData Manipulation (SQL/Python)Technical Screen
• Consolidate and Rank Global Salaries in USDMedium

  This question evaluates data consolidation, currency normalization, and ranking competencies, measuring the ability to combine country-specific employee data and convert salaries into a common USD basis within the Data Manipulation (SQL/Python) domain.

  AmazonData ScientistData Manipulation (SQL/Python)Technical Screen
• Control Robot Charging with Repeated Polling and Exclusive Station AssignmentsMedium

  Design a repeatedly invoked robot-charging controller with strict battery thresholds, exclusive station assignments, waiting robots, and safe command retries.

  AmazonSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Count Connected Components in an Undirected GraphMedium

  This question tests the ability to traverse an undirected graph using graph search algorithms to identify and count disjoint subgraphs.

  AmazonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Count Customers Buying Both 'Kindle' and 'Alexa'Medium

  This question evaluates proficiency in relational data manipulation and set-based reasoning, assessing SQL competency such as joins, aggregation, and identifying distinct customers who purchased multiple specified products.

  AmazonBusiness Intelligence EngineerData Manipulation (SQL/Python)Onsite
• Count Customers Who Visited on Multiple DatesMedium

  Tests data manipulation, hash set/map aggregation, and date deduplication to identify users with repeat visits across distinct calendar days.

  AmazonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Count Four-Neighbor Islands in a Binary MatrixMedium

  Count four-neighbor islands in a binary matrix and consider the connectivity state needed when rows arrive as a stream.

  AmazonSoftware EngineerCoding & AlgorithmsOnline Assessment
• Count expressions reaching a target sumMedium

  This interview question evaluates algorithm design, data structures, correctness, complexity, edge cases, and implementation details in a realistic interview setting. A strong answer for Count expressions reaching a target sum states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.

  AmazonSoftware EngineerCoding & AlgorithmsOnsite
• Count partitions and equal-cost packagesMedium

  This question evaluates string-processing and combinatorial counting skills, including tracking distinct-character occurrences across contiguous partitions and using frequency-based pairing logic on arrays to form equal-cost packages.

  AmazonSoftware EngineerCoding & AlgorithmsOnline Assessment
• Count regions with DFSMedium

  This question evaluates proficiency in graph traversal and grid-based connected-component detection using depth-first search on a binary m x n grid, along with algorithmic complexity analysis and techniques to avoid revisiting cells.

  AmazonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Count the Distinct Binary Search Tree Shapes for Keys 1 to nMedium

  Count how many structurally different binary search trees can store the keys 1 through n exactly once, for n up to 19. It tests reasoning about how tree shapes decompose and counting combinatorial structures efficiently instead of building every tree.

  AmazonSoftware EngineerCoding & AlgorithmsOther
• Count unique Morse-code word transformationsHard

  This question evaluates a candidate's ability to implement string transformations based on a fixed character-to-code mapping and to identify distinct results, testing competencies in encoding, string manipulation, and deduplication.

  AmazonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Course Prerequisite FeasibilityMedium

  This question tests the ability to detect cycles in a directed graph to determine if a set of academic courses with prerequisite constraints can be completed.

  AmazonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Create Country-Level Spend Report Using PandasMedium

  This question evaluates proficiency in data manipulation using pandas, including relational joins and aggregation to produce country-level summary statistics like totals and averages.

  AmazonData ScientistData Manipulation (SQL/Python)Technical Screen
• Create SQL Queries for Sales and Customer AnalysisMedium

  This question evaluates proficiency in SQL-based data manipulation, covering aggregation and dispersion metrics, null handling, relational joins, and window functions for ranking customers.

  AmazonData ScientistData Manipulation (SQL/Python)Technical Screen
• Create a Binary Tree from Parent-Child DescriptionsMedium

  Construct one valid binary tree from unordered parent-child descriptions that identify left and right links. Reuse node identities across records, support children appearing before parents, and return the unique root.

  AmazonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Customer Focus: Going Above and Beyond and Shipping a Customer-Driven ChangeMedium

  An Amazon behavioral question on customer focus: describe a time you went above and beyond for a customer, and a change you made that was driven by customer needs. It tests how you discover customer problems, act on them beyond expectations, and measure the impact.

  AmazonSoftware EngineerBehavioral & LeadershipOnsite
• Debug Failing Tests in a Django Movie Search and Filter APIHard

  Debug an existing Django movie catalog API whose automated tests fail, covering URL routing, query parameter handling, queryset filters on genre, director, writer, rating and year, result ordering with tie-breakers, and HTTP 500 errors. It tests a systematic, layer-by-layer debugging process under a time limit.

  AmazonSoftware EngineerSoftware Engineering FundamentalsOnline Assessment
• Debug Watch List Movie OperationsMedium

  This question evaluates backend debugging, RESTful API semantics, data validation and integrity, persistence behavior, and correct HTTP status and error-response handling for watch-list movie operations.

  AmazonSoftware EngineerSoftware Engineering FundamentalsOnline Assessment
• Debug a Layered Book Search Service Against Five Search RulesHard

  Given a layered bookstore search backend with planted bugs, write failing tests for substring matching, scope selection, case-insensitivity, multi-key ordering and visibility, then locate and fix every defect without changing the API contract. Tests test-first debugging across layers and query design.

  AmazonSoftware EngineerSoftware Engineering FundamentalsOnline Assessment
• Debug a Node.js car-rental backend: leaked cars, missing new cars, lost editsMedium

  An unfamiliar Node.js car-rental backend with API documentation and failing preset tests has three independent bugs: the My Cars list shows other users' cars, newly added cars never appear, and edits vanish after a refresh. The question tests systematic debugging, ownership checks across endpoints, and confirming that writes really persist.

  AmazonSoftware EngineerSoftware Engineering FundamentalsOnline Assessment
• Debug a Test-Driven C++ ProjectMedium

  Tests your ability to design and implement a sliding-window rate limiter with deduplication and state cleanup, reflecting common logic and edge-case errors encountered when debugging test-driven C++ systems.

  AmazonSoftware EngineerSoftware Engineering FundamentalsOnline Assessment
• Debug an Issue-Creation API FailureHard

  This problem tests your systematic troubleshooting methodology for a distributed system, focusing on narrowing down the root cause of an API request failure.

  AmazonSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Decide standardization, sparse numerics, correlated featuresMedium

  This question evaluates a candidate's competency in feature engineering and preprocessing for mixed-type tabular data, including handling sparse counts and heavy-tailed monetary features, missingness and zero-inflation, correlated continuous measurements, model-specific scaling needs, and the design of leak-safe pipelines and validation strategies.

  AmazonData ScientistMachine LearningTechnical Screen