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Software Engineer 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
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- 546
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- 11
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- 8
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Showing 4771–4800 of 5874 results
- RubrikHardSoftware EngineerValidate BFS order queries on a tree
This question evaluates understanding of BFS traversal, tree graph representation, and the ability to reason about allowable dequeue/enqueue orderings in a FIFO queue.
Coding & AlgorithmsOnline Assessment - RunloopMediumSoftware EngineerDesign a Minesweeper Bot That Decides Which Cell to Flag or Reveal Next
Design a bot that plays Minesweeper and maximizes its chance of winning. The question tests how the bot turns revealed numbers into constraints, finds cells that are certainly mines or certainly safe, estimates the risk of every hidden cell when it must guess, and keeps each move fast and measurable over many games.
Software Engineering FundamentalsTechnical Screen - RunloopMediumSoftware EngineerReturn a Topological Order or Detect a Cycle
This problem tests your ability to implement Kahn's algorithm for topological sorting while incorporating a priority-based tie-breaking mechanism to ensure deterministic output.
Coding & AlgorithmsTechnical ScreenGraphTopological SortHeap - SIG (Susquehanna)MediumSoftware EngineerCount Equal-Difference Triples After Each Add or Remove-All Operation
Process a stream of add-one and remove-all operations on a multiset and report, after each operation, how many element triples form an arithmetic progression with a fixed positive difference. It tests efficient incremental updates, correct treatment of duplicate occurrences, and counts that exceed the 32-bit range.
Coding & AlgorithmsOnline Assessment - SIG (Susquehanna)MediumSoftware EngineerCount subarrays with odd zero count
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 subarrays with odd zero count states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Coding & AlgorithmsOnline Assessment - 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 EngineerRotate a Square Matrix Clockwise While Both Diagonals Stay Fixed
Rotate every element of a square matrix that lies off both diagonals by 90 degrees clockwise a given number of times, leaving the main-diagonal and anti-diagonal values in place. It tests precise index mapping, handling of odd and even matrix sizes, and bug-free simulation under timed assessment conditions.
Coding & AlgorithmsOnline Assessment - 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 - SalesforceHardSoftware EngineerAnswer ownership, conflict, and failure recovery questions
This question evaluates ownership, conflict resolution, incident response, stakeholder management, and accountability competencies relevant to software engineering.
Behavioral & LeadershipTechnical Screen - SalesforceHardSoftware EngineerArchitect serving and storage for recommender
Architect serving and storage for recommender 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 - SalesforceMediumSoftware EngineerBehavioral deep dive: scaling decisions, zero-to-one platforms, traffic spikes, conflict
Hiring manager behavioral round for a senior backend engineer: a deep dive into a system you own with probing on scaling decisions and failure modes, plus stories about building a platform from zero, handling an unexpected traffic spike, resolving cross-team conflict, and motivation for the move.
Behavioral & LeadershipOther - SalesforceMediumSoftware EngineerBehavioral: Coaching a Teammate and Upholding Team Coding Standards
Two-part behavioral question for senior engineers: how you helped a teammate get better at a specific task, and how you maintain coding standards across your team. It tests mentoring approach, measurable growth, automating standards, code review norms and building team buy-in.
Behavioral & LeadershipOther - SalesforceMediumSoftware EngineerBehavioral: Pivoting Mid-Project and Handing Off Work You Owned
Two-part behavioral question for senior engineers: a time you had to pivot in the middle of a project, and a time you were pulled off a project where you were the main point of contact. It tests adaptability, re-planning, stakeholder communication and responsible handoffs.
Behavioral & LeadershipOther - 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 - SalesforceMediumSoftware EngineerChoose DynamoDB vs MySQL for a backend
This question tests your ability to evaluate database technologies based on specific application requirements, trade-offs in consistency models, and operational scalability.
Software Engineering FundamentalsTechnical ScreenSystem DesignDatabaseNoSQL - SalesforceMediumSoftware EngineerConvert integer to NAF form
This question evaluates understanding of number representations (Non-Adjacent Form), bit-level optimization, and formal proof techniques for demonstrating minimal Hamming weight, together with algorithmic complexity analysis.
Coding & AlgorithmsOnline Assessment - SalesforceMediumSoftware EngineerCount the Steps at Which Set Bits Form an Exact Prefix of Ones
Array problem: the bits of an all-zero binary string are set one at a time in the order given by a permutation; count the steps after which exactly the first i bits are set. It tests careful reasoning about prefix conditions and handling large inputs efficiently.
Coding & AlgorithmsOther - 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 EngineerDelete Every Value That Repeats in an Unsorted Singly Linked List
Linked list problem: delete every node whose value occurs more than once in an unsorted singly linked list, removing all copies and keeping the remaining nodes in their original order. It tests frequency counting, list traversal and careful handling of removals, including at the head of the list.
Coding & AlgorithmsOther - SalesforceMediumSoftware EngineerDelete One Character Type to Minimize Unique Segments
Determine which single character type to delete from a string so that greedily partitioning the remaining characters into substrings with all-unique characters yields the minimum number of segments.
Coding & AlgorithmsOnline Assessmentgreedystringhash-table - SalesforceMediumSoftware EngineerDescribe a memorable bug and persuasion story
This question evaluates a software engineer's practical debugging, incident management, and root-cause analysis skills together with persuasion, stakeholder alignment, and leadership competencies when describing a memorable bug and influencing outcomes.
Behavioral & LeadershipTechnical Screen - 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 O(nm) grouping of rearranged strings
This question evaluates a candidate's understanding of string manipulation, hashing and frequency-count techniques, algorithmic optimization, and time/space complexity analysis when grouping anagrams.
Coding & AlgorithmsTechnical Screen - 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 - SalesforceMediumSoftware EngineerDesign a Coffee-Shop Order-Management System
Design a distributed order-management system for a multi-location coffee shop chain, focusing on transactional order states, menu snapshotting, idempotent payment processing, and resilient preparation workflows.
System DesignOnsitesystem-designdistributed-systemspayments
Rubrik
SIG (Susquehanna)
Salesforce