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Interview Questions
Practice 9403 coding, system design and machine learning questions from 546 companies, sorted by role, topic and interview round. Every question has step-by-step hints, a code runner that supports 8 languages and an AI mentor; members also get the full solution walkthrough.
- 9403
- Questions
- 546
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- 11
- Topics
- 8
- Languages
Showing 691–720 of 4616 results
- AtlassianEasySoftware EngineerDesign a Rate Limiter Service: Components, Scaling and Precision Trade-offs
A three-part system design question about a rate limiter service: the components a simple limiter needs, how to scale it as users grow and what breaks, and how to make limits more precise. It tests shared counters, atomic updates, hot callers, failure policy and the accuracy trade-offs between rate limiting algorithms.
System DesignTechnical Screen - AtlassianMediumSoftware EngineerDesign a distributed rate limiter service
This question tests the ability to design a scalable, low-latency distributed rate-limiting service that handles high-concurrency requests across multiple microservices.
System DesignTechnical ScreenDistributed SystemsCachingScalability - AtlassianHardSoftware EngineerDesign a scalable tagging system
This question tests a candidate's ability to design scalable data models and distributed indexing strategies for a multi-tenant tagging system. It evaluates system design competency across storage, caching, sharding, and consistency trade-offs — core skills assessed in senior software engineering interviews.
System DesignTechnical Screen - AtlassianMediumSoftware EngineerDesign a simple greeting-card web app
This question assesses the ability to design a scalable, functional MVP for a greeting-card service, focusing on user-generated content storage and retrieval.
System DesignTechnical ScreenAPI DesignDatabase ModelingScalability - AtlassianMediumSoftware EngineerDesign a trie-based URL router with wildcards
Design a trie-based URL router with wildcards 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.
Coding & AlgorithmsTechnical Screen - AtlassianMediumSoftware EngineerDetermine whether a word exists in a letter grid
Implement a backtracking search to determine if a target word can be formed by sequentially adjacent cells in a 2D character grid without reusing any cell.
Coding & AlgorithmsTechnical Screenbacktrackingdfsmatrix - AtlassianMediumSoftware EngineerDiagnose why a scaled system became slow
Tests systematic incident triage, observability strategies, and root-cause analysis across distributed tiers (caching, connection pools, databases, compute) when a scaled service suffers severe latency degradation.
System DesignTechnical Screensystem-designobservabilityperformance-debugging - AtlassianHardSoftware EngineerEnsure thread-safe updates to org hierarchy
Ensure thread-safe updates to org hierarchy 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.
System DesignTechnical Screen - AtlassianEasySoftware EngineerFilter Invalid Data Events
Tests your ability to implement a multi-condition event filtering and deduplication pipeline while preserving input order, along with complexity analysis for batch and stream processing.
Coding & AlgorithmsTechnical Screenhash-tabledata-processingarrays - AtlassianMediumData ScientistFind 2023 NCAA championship winner
This question evaluates proficiency in SQL data manipulation and relational reasoning, testing the ability to identify a championship winner from game result records across related tables in the Data Manipulation (SQL/Python) domain for data scientist roles.
Data Manipulation (SQL/Python)Technical Screen - AtlassianMediumSoftware EngineerFind nearest common manager for multiple employees
This question evaluates proficiency in tree and graph algorithms (lowest common ancestor), input validation for hierarchical data (cycle and disconnected component detection), API design for constructing and querying trees, and algorithmic time/space complexity analysis.
Coding & AlgorithmsTechnical Screen - AtlassianMediumSoftware EngineerFind smallest common organization for employees
This problem tests your ability to navigate hierarchical structures and find the Lowest Common Ancestor (LCA) in a tree or a directed acyclic graph representing organizational reporting lines.
Coding & AlgorithmsTechnical ScreenTreeLCADFS - AtlassianMediumFrontend EngineerFront-End Design of an Emoji Picker with a Search Field
A candidate-driven front-end system design discussion about an emoji picker with a search field. It tests how a candidate scopes the component, models and loads the emoji catalog, ranks search results, keeps a grid of thousands of emoji fast, and supports keyboard and screen-reader users.
System DesignTechnical Screen - AtlassianMediumSoftware EngineerHighlight the Shortest Unique Substring in Each Label
Find and highlight the shortest case-insensitive unique substring in each label using bracket notation, breaking ties by earliest index and preserving original casing.
Coding & AlgorithmsTechnical Screenstringshash-tabletrie - AtlassianMediumData ScientistImplement Real-Time Rate Limiting for Web Service Requests
This question evaluates understanding of real-time rate limiting, time-windowed traffic control, and efficient per-client state management under algorithmic constraints.
Coding & AlgorithmsTechnical Screen - AtlassianMediumSoftware EngineerImplement sequential and parallel URL requests
Implement an asynchronous batch URL fetcher that executes requests with bounded concurrency, deduplicates network calls, preserves input order, and handles per-request errors gracefully.
Coding & AlgorithmsTechnical Screenconcurrencyasync-awaitnetworking - AtlassianMediumSoftware EngineerImplement sliding-window rate limiter function
This problem tests your ability to design a thread-safe rate limiter using a sliding window approach, focusing on time complexity optimization and memory management.
Coding & AlgorithmsTechnical ScreenConcurrencyData StructuresSliding Window - AtlassianMediumSoftware EngineerMerge intervals and design rating APIs
Tests interval merging logic alongside stateful data structure design for tracking agent performance, calculating streaming averages, and ranking agents with deterministic tie-breaking.
Coding & AlgorithmsTechnical Screenintervalsheaphash-table - AtlassianMediumSoftware EngineerMerge overlapping intervals
This problem tests your ability to manipulate array-based data structures, specifically focusing on sorting and linear-time interval merging logic.
Coding & AlgorithmsTechnical ScreenArraysSortingGreedy - AtlassianEasySoftware EngineerPer-Caller Request Limiter Over Non-Decreasing Time Buckets
A coding question about a rate limiter that receives requests as time bucket and caller pairs, in non-decreasing bucket order, and decides which to allow when each caller may make only a fixed number of requests per bucket. It tests stateful counting, per-key bookkeeping and correct handling of bucket changes.
Coding & AlgorithmsTechnical Screen - AtlassianMediumData ScientistTrain and evaluate logistic model with regularization
This question evaluates proficiency in supervised binary classification with logistic regression, implementation of L1 and L2 regularization, data preprocessing (missingness checks and standardization), hyperparameter selection via cross-validation, and model evaluation using ROC AUC and threshold-dependent metrics.
Machine LearningTechnical Screen - AtlysMediumSoftware EngineerDesign a Splitwise-Style Expense Splitter with Minimum-Transaction Debt Settlement
Design a Splitwise-style shared-expense app, covering functional and non-functional requirements, API design and core entities, then implement settle() to produce payments that clear every balance and settle_optimally() to use the fewest transactions. Tests object-oriented design, exact money handling, and reasoning about optimality and complexity.
Software Engineering FundamentalsTechnical Screen - AtlysMediumSoftware EngineerDesign a Tour-Expense Splitter That Minimizes Payments
Design a shared-expense tracker for a touring band: members log who paid for what and how it was split, the app maintains running balances, and two settlement modes produce the payments needed to zero every balance -- a simple pairwise payoff and an optimal one using the fewest transactions. Tests API/entity design plus a min-cash-flow-style algorithm.
Software Engineering FundamentalsTechnical Screensystem-designgraphsgreedy - AttentiveMediumSoftware EngineerDesign Broadcast Scheduling APIs
This question evaluates a candidate’s ability to design scalable, reliable broadcast and scheduling systems, covering API design, data modeling, distributed scheduling, delivery semantics, idempotency, retries, and operational fault-tolerance.
System DesignTechnical Screen - AttentiveMediumSoftware EngineerDesign Robust Large-Input Processing
This question evaluates debugging and root-cause analysis, memory management, streaming/chunked data processing (including correctness across chunk boundaries), and system reliability aspects such as observability, testing, and recovery for large-input backends.
System DesignTechnical Screen - AttentiveMediumSoftware EngineerDesign Storage for a Flexible Metrics Monitoring System
This problem tests the ability to design a time-series storage system by balancing read/write throughput, data retention policies, and query performance at scale.
System DesignTechnical ScreenTime-SeriesDatabaseData Modeling - AttentiveMediumSoftware EngineerDesign a Data Puller for a Third-Party API Capped at 3 Requests per Second
Design a service that pulls and syncs data from a third-party API that enforces a hard limit of 3 requests per second. It tests global rate limiting across distributed workers, retry and backoff behavior, incremental sync with checkpoints, and prioritizing work when demand exceeds the request budget.
System DesignTechnical Screen - AttentiveHardData ScientistExplain switch to product analytics and company fit
This question evaluates a data scientist's product analytics and leadership competencies, including end-to-end decision ownership, prioritization of product metrics, communicating trade-offs between statistical rigor and speed, and influencing stakeholders within a B2B mobile messaging context that has compliance and deliverability constraints.
Behavioral & LeadershipTechnical Screen - AttentiveMediumSoftware EngineerFind Inclusive Index Ranges for Time-Window Queries on Timestamp-Sorted Logs
Given log timestamps sorted in non-decreasing order with possible duplicates, answer many inclusive time-window queries by returning the first and last index of the entries inside each window, where a window may extend past the data's time range. It tests O(log n) per-query boundary searches on sorted data with duplicate keys.
Coding & AlgorithmsTechnical Screen - AttentiveMediumSoftware EngineerRemove Adjacent Duplicate Runs of Length K
Implement a linear-time string reduction algorithm that repeatedly eliminates adjacent runs of k identical characters using a stack.
Coding & AlgorithmsTechnical Screenstackstringalgorithms
Atlassian
Attentive