practice a little every day, paws crossed ♡
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
- Companies
- 11
- Topics
- 8
- Languages
Showing 3001–3030 of 3640 results
- RobloxMediumData ScientistGenerate Friendship List with Acceptance Dates Using Pandas
This question evaluates proficiency in data manipulation and relational reasoning using Python/pandas, focusing on transforming event logs into canonical pairwise relationships and extracting activation timestamps.
Data Manipulation (SQL/Python)Onsite - RobloxMediumSoftware EngineerImplement a Log Rate Limiter
This problem tests your ability to design a thread-safe, time-windowed rate limiter using efficient data structures to track event timestamps.
Coding & AlgorithmsOnsiteHash TableDesignConcurrency - RobloxMediumSoftware EngineerImplement a sliding-window rate limiter
Evaluates the candidate's ability to design and implement an in-memory sliding-window rate limiter enforcing per-user and per-game constraints, focusing on correct request-acceptance semantics and efficient timestamp eviction; Category/domain: Coding & Algorithms; Level of abstraction: component-level algorithm and data-structure implementation.
Coding & AlgorithmsOnsite - RobloxMediumSoftware EngineerImplement queue-based rate limiter with multi-key limits
This question evaluates implementation and design skills around rate limiting, including rolling-window counters, multi-key constraints, and atomic updates, and falls under the Coding & Algorithms domain focused on practical application of algorithms and data structures.
Coding & AlgorithmsOnsite - RobloxMediumData ScientistMatch requests and accepts into friendships in SQL
This question evaluates a candidate's competency in SQL data manipulation, focusing on temporal joins, deduplication of bidirectional relationships, selecting the earliest valid event, and reasoning about event-order constraints.
Data Manipulation (SQL/Python)Onsite - RobloxMediumData ScientistOptimize bread-factory pipeline for max profit
This question evaluates skills in combinatorial optimization, budgeted resource allocation, bottleneck throughput modeling, and algorithm design with cost amortization for maximizing profit under constraints.
Coding & AlgorithmsOnsite - RobloxHardSoftware EngineerOutline the ML inference and labeling pipeline
Outline the ML inference and labeling pipeline evaluates ML product requirements, data/labeling, modeling, serving architecture, evaluation, monitoring, and trade-offs in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
ML System DesignOnsite - RobloxMediumSoftware EngineerSimulate robot path and detect boundedness
This question evaluates the ability to simulate iterative movement and reason about repeated state transformations, testing competencies in algorithm design, cycle detection, and geometric reasoning; it falls under the Coding & Algorithms category.
Coding & AlgorithmsOnsite - RogoMediumMachine Learning EngineerInfer the Smallest Valid Character Order from Sorted Password Hints
This problem tests your ability to model dependency constraints using a Directed Acyclic Graph (DAG) and apply Kahn's algorithm or DFS-based topological sorting to resolve ordering dependencies.
Coding & AlgorithmsOnsiteGraphTopological SortPriority Queue - RogoMediumMachine Learning EngineerManage Context Windows in an Applied AI System
This question tests the ability to design a robust context-management layer for an LLM-based application that balances limited token capacity against competing sources of information.
ML System DesignOnsiteLLMRAGSystem Design - RoktEasySoftware EngineerImplement basic calculator with four operations
This question evaluates a candidate's ability to parse and evaluate arithmetic expressions, correctly apply operator precedence and left-to-right associativity, and handle integer arithmetic details such as truncating division, whitespace, and multi-digit numbers, and is commonly asked to assess implementation-level parsing and algorithmic reasoning. The category is Coding & Algorithms and the level of abstraction is practical application, focusing on coding an efficient evaluator that balances time and space constraints rather than purely conceptual theory.
Coding & AlgorithmsOnsite - RokuMediumSoftware EngineerCompute longest common subsequence length
This question tests the ability to solve the Longest Common Subsequence (LCS) problem using dynamic programming to optimize overlapping subproblems.
Coding & AlgorithmsOnsiteDynamic ProgrammingStringsAlgorithms - RokuMediumBackend EngineerDesign a high-throughput ad exchange
This problem tests your ability to design a low-latency, high-throughput distributed system capable of managing real-time bidding (RTB) auctions for streaming video advertisements.
System DesignOnsiteDistributed SystemsLow LatencyHigh Throughput - RokuMediumSoftware EngineerDesign a video-on-demand streaming service
This problem tests your ability to design a distributed video-on-demand platform, focusing on content ingestion, delivery at scale, and media processing pipelines.
System DesignOnsiteScalabilityCDNDistributed Systems - RokuMediumBackend EngineerExplain concurrency and distributed fundamentals
This question tests fundamental knowledge of thread-safe collections in Java and core distributed systems architectural patterns, specifically partitioning strategies.
Software Engineering FundamentalsOnsiteJavaConcurrencyDistributed Systems - RubrikMediumSoftware EngineerEngineering manager behavioral: driving a cross-team outcome from an ambiguous goal
An engineering manager behavioral prompt about owning an ill-defined goal that depended on other teams. It tests how a candidate removes ambiguity, secures cross-team commitments, runs execution through setbacks, and explains the specific decisions and trade-offs they personally made.
Behavioral & LeadershipOnsite - RubrikMediumSoftware EngineerEngineering manager interview: a leadership call you owned and an engineer you grew
A two-part engineering manager interview on leadership and mentorship. It asks for a situation where the candidate's own decision shaped the team's success and for a concrete account of growing an engineer, probing personal judgment, trade-offs and evidence of impact under targeted follow-ups.
Behavioral & LeadershipOnsite - RubrikMediumSoftware EngineerEngineering manager peer round: technical quality, ownership and long-term team health
A peer interview for an engineering manager role on engineering judgment and team culture. It probes the candidate's engineering principles, a real quality-versus-speed decision, and how they build ownership, collaboration and joint innovation with peer teams, and long-term team health.
Behavioral & LeadershipOnsite - SIG (Susquehanna)EasySoftware EngineerDesign a Cash Register with Inventory and Profit Tracking
Design an object-oriented cash register that manages multi-lot product inventory using FIFO accounting, executes atomic multi-item sales, and accurately tracks realized gross profit.
Software Engineering FundamentalsOnsiteObject-Oriented DesignData StructuresQueue - SIG (Susquehanna)EasySoftware EngineerFind Company Tickers Mentioned in a News Headline
Implement a headline scanner that identifies mentioned company names using whole-word matching and returns their unique stock tickers in the order specified by the input mapping.
Coding & AlgorithmsOnsiteStringsHash TableTrie - SIG (Susquehanna)MediumSoftware EngineerFind and Fix C++ Ownership Bugs: Double Free, Shallow Copy, and Object Slicing
Tests a candidate's ability to identify and fix critical C++ resource management bugs, specifically shallow copies leading to double-free errors and object slicing caused by improper pass-by-value semantics with polymorphic types.
Software Engineering FundamentalsOnsiteC++Memory ManagementRAII - SIG (Susquehanna)MediumSoftware EngineerImplement a Simplified std::vector with Manual Memory Management
Tests practical systems programming in C++, specifically decoupling raw memory allocation from object construction, managing dynamic capacity growth, and adhering to the Rule of Five.
Software Engineering FundamentalsOnsitecppmemory-managementdata-structures - SIG (Susquehanna)EasySoftware EngineerIndex a CSV Movie Catalog for Fast Year-Range Queries
Design an immutable movie catalog that parses CSV data and supports fast, inclusive year-range queries using binary search or indexing.
Software Engineering FundamentalsOnsitebinary-searchdata-structurescsv-parsing - SIG (Susquehanna)MediumSoftware EngineerSolve theatre seating and ticker extraction
This question evaluates algorithmic problem-solving skills across two areas: efficient seat-allocation and interval occupancy reasoning for grouping in a constrained seating layout, and robust string processing with phrase-based, case-insensitive matching and mapping to ticker identifiers.
Coding & AlgorithmsOnsite - SIG (Susquehanna)MediumSoftware EngineerTrees and Binary Search Trees: Taxonomy, Invariant, and Traversal/Search
Tests understanding of binary tree taxonomy, global BST invariants versus local parent-child checks, and efficient tree search under range constraints.
Software Engineering FundamentalsOnsitebinary-search-treetree-traversalrecursion - SalesforceMediumSoftware EngineerBinary Tree Path Sum
Determine if a binary tree contains a root-to-leaf path whose node values add up to a given target sum.
Coding & AlgorithmsOnsiteBinary TreeDFSBFS - SalesforceMediumMember of Technical StaffConvert a Sorted Doubly Linked List to a Balanced BST In Place
Tests in-place pointer manipulation and bottom-up tree construction by converting a sorted doubly linked list into a height-balanced binary search tree in linear time.
Software Engineering FundamentalsOnsitelinked-listbinary-search-treerecursion - SalesforceMediumSoftware EngineerCount the Ways to Split a Digit String into Primes
Tests 1D dynamic programming combined with primality testing to count valid partitions of a digit string into prime segments modulo 10^9 + 7.
Coding & AlgorithmsOnsiteDynamic ProgrammingMathNumber Theory - SalesforceMediumSoftware EngineerDescribe the Team Environment in Which You Do Your Best Work
Explain the concrete team behaviors, decision practices, feedback norms, and responsibilities that help you do your best work. Also show how you contribute to that environment and adapt when the team operates differently.
Behavioral & LeadershipOnsite - SalesforceMediumSoftware EngineerDesign a 911 emergency calling service
This question evaluates a candidate's ability to design a highly available, scalable emergency-calling platform covering real-time call flow, accurate caller location validation, PSAP routing, interoperability with telephony/SIP providers, and regulatory/security considerations.
System DesignOnsite
Roblox
Rubrik
SIG (Susquehanna)
Salesforce