practice a little every day, paws crossed ♡
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
- Questions
- 546
- Companies
- 11
- Topics
- 8
- Languages
Showing 1951–1980 of 2336 results
- 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 - 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 - 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 - SalesforceMediumSoftware EngineerDesign a Concurrent Car Reservation Service
Design a concurrent car reservation service with availability search, temporary holds, confirmation, cancellation, and status lookup. Explain interval conflicts, atomic inventory claims, retry safety, hold expiry, stale search results, substitutions, partitioning, and double-booking prevention.
System DesignOnsite - SalesforceMediumSoftware EngineerDesign a Multi-Tenant Enterprise Messaging System
Design a multi-tenant enterprise messaging system with direct messages, multiple channel types, durable history, real-time delivery, offline catch-up, search, presence, and read positions. Explain ordering, permissions, fan-out, storage, and strict tenant isolation.
System DesignOnsite - SalesforceMediumSoftware EngineerDesign a Multi-Vendor Integration Platform
Design a multi-vendor integration platform for authorized actions and inbound events across providers with different APIs. Define an extensible connector contract, secure credential handling, durable retries, rate isolation, webhook and polling ingestion, deduplication, and schema evolution.
System DesignOnsite - SalesforceMediumSoftware EngineerDesign a Ride-Hailing Platform: Driver Matching, Surge Pricing and Ride Acceptance
Design the core of a ride-hailing platform, covering driver location ingestion, matching riders with nearby drivers, the offer and acceptance flow with timeouts and reassignment, and surge pricing per area. It tests geospatial indexing, state machines and consistency under concurrent updates.
System DesignOnsite - SalesforceMediumSoftware EngineerDesign a Scalable Notification Service
Design an enterprise-grade, multi-channel notification platform capable of handling billions of notifications with durable ingestion, dynamic user preference filtering, idempotency, rate limits, and pluggable delivery providers.
System DesignOnsiteDistributed SystemsMessage QueuesRate Limiting - SalesforceMediumSoftware EngineerDesign a Synchronized Watch Party System (LLD)
Design a low-level object-oriented system for real-time synchronized video playback among multiple participants. The challenge tests class design, state synchronization protocols, and handling of network latency and clock drift.
System DesignOnsiteLow-Level DesignObject-Oriented DesignReal-Time Systems - SalesforceMediumSoftware EngineerDesign a URL-Shortening Service
Design short-link creation and redirects with unique identifiers, durable mappings, caching, expiration, and explicit multi-region consistency choices.
System DesignOnsite - SalesforceMediumSoftware EngineerDesign a Venue Rental and Booking System (HLD)
Design a high-level architecture for a venue rental marketplace, focusing on inventory availability modeling, concurrency control to prevent double-booking, and resilient schema and API design under read-heavy traffic.
System DesignOnsiteDistributed SystemsDatabase DesignConcurrency - SalesforceMediumSoftware EngineerDesign a pipeline orchestration system on Kubernetes
This question tests the ability to design a container-orchestrated workflow system that manages dependencies, task execution, and system reliability.
System DesignOnsiteKubernetesDistributed SystemsWorkflow Orchestration - SalesforceMediumSoftware EngineerDesign a scalable coffee ordering notification system
This problem tests your ability to design a distributed, asynchronous notification system capable of handling high-throughput order status updates and ensuring reliable message delivery to end users.
System DesignOnsiteScalabilityAsynchronousMessaging - SalesforceMediumSoftware EngineerDesign an analytics dashboard for an AI chat app
This question tests the ability to architect a scalable observability pipeline for high-throughput AI chat interactions, focusing on metrics ingestion, data aggregation, and multi-dimensional query performance.
System DesignOnsiteAnalyticsScalabilityOLAP - SalesforceMediumSoftware EngineerDiameter of an Undirected Tree
Tests your ability to traverse an unrooted, undirected tree to compute its diameter (longest simple path) in linear time and space.
Coding & AlgorithmsOnsitetreegraphbfs - SalesforceMediumSoftware EngineerFind a Celebrity from a Knows Matrix
Find a celebrity in a knows matrix with linear candidate elimination followed by complete verification that the candidate knows nobody and is known by everyone else.
Coding & AlgorithmsOnsite - SalesforceMediumSoftware EngineerFind a Valid Task Execution Order with Dependencies
Tests the ability to model workflow dependencies as a directed graph, perform topological sorting, and detect cycles.
Coding & AlgorithmsOnsitegraphtopological-sortbfs - SalesforceMediumSoftware EngineerFind the Kth Smallest Value in a Binary Search Tree
Return the one-based kth smallest value from a potentially deep binary search tree represented by parallel value and child-index arrays. Handle empty trees and out-of-range values of k using the specified sentinel.
Coding & AlgorithmsOnsite - SalesforceMediumSoftware EngineerFind the Lowest Common Ancestor Using Parent Pointers
Find the lowest common ancestor of two nodes in an acyclic forest represented only by parent pointers. Return the node itself for equal inputs and minus one when the nodes belong to different trees.
Coding & AlgorithmsOnsite - SalesforceMediumSoftware EngineerFlatten Nested Objects and Lists into Full Leaf Paths
Implement an iterative traversal to flatten nested dictionaries and lists into fully-qualified paths leading only to string leaf values, returned in deterministic sorted order.
Coding & AlgorithmsOnsiteDepth-First SearchStackRecursion - SalesforceMediumSoftware EngineerGenerate Every Generalized Abbreviation of a Word
Generate every generalized abbreviation of a lowercase word by replacing selected character runs with positive counts. Merge consecutive skipped characters correctly and return the complete result in lexicographic order.
Coding & AlgorithmsOnsite
SIG (Susquehanna)
Salesforce