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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.
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Showing 4801–4830 of 5874 results
- 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 coffee ordering system
This question evaluates system design competency, focusing on order lifecycle modeling and state-machine enforcement, idempotency and data consistency, event-driven integration, real-time status propagation, and scaling across stores.
System DesignTechnical Screen - 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 recommendation system
This problem tests the ability to design an end-to-end recommendation engine, focusing on the pipeline from data ingestion to real-time inference and model evaluation.
ML System DesignTechnical ScreenRecommendation SystemsScalabilityLatency - 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 a tenant-isolated system to replicate large recordings to per-customer data centers
System design question: build a tenant-isolated pipeline that copies large files such as call recordings from a source data center to each customer's chosen data centers. It tests staged design from a simple copy to asynchronous fan-out, resumable transfers, retries, verification, reconciliation and per-tenant isolation.
System DesignOther - 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 - SalesforceHardSoftware EngineerDesign an async job system and cache layer
This question tests the ability to architect a distributed job processing system and integrate a high-performance caching layer to handle scheduling, execution, and state management at scale.
System DesignTechnical ScreenDistributed SystemsCachingAsync Processing - SalesforceHardSoftware EngineerDesign an end-to-end recommendation system
Design an end-to-end recommendation system 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 DesignTechnical Screen - SalesforceHardSoftware EngineerDesign cloud & k8s architecture
This interview question evaluates requirements, scale assumptions, API/data design, architecture, trade-offs, failure modes, and rollout in a realistic interview setting. A strong answer for Design cloud & k8s architecture states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
System DesignTechnical Screen - SalesforceHardSoftware EngineerDesign secure Kubernetes with CI/CD
This question evaluates expertise in Kubernetes architecture, cluster operations and troubleshooting, security hardening, and CI/CD pipeline design for managed Kubernetes clusters, covering control plane and node responsibilities, incident diagnosis, access and network policies, secret management, image integrity, and progressive delivery mechanisms. It is commonly asked to assess operational and security judgment and design thinking, testing both conceptual understanding of distributed control and security models and practical application in real-world CI/CD and incident-response scenarios within the System Design domain.
System DesignTechnical Screen - SalesforceMediumSoftware EngineerDetermine minimal substitutions and removals
This question evaluates string manipulation and adjacency-constraint handling in the first task and sequence analysis with minimal-removal and subsequence reasoning in the second, targeting competencies such as local transformation logic, subsequence recognition, and optimization under input constraints.
Coding & AlgorithmsOnline Assessment - 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 - SalesforceHardSoftware EngineerDiscuss Transferable Experience for a New Mobile Product Team
This question tests your ability to translate non-mobile technical expertise into a mobile context, showing maturity in identifying skill gaps and a structured approach to learning and team contribution.
Behavioral & LeadershipTechnical ScreenBehavioralEngineering-StrategyAdaptability - SalesforceMediumSoftware EngineerExplain background and Salesforce motivation
Explain background and Salesforce motivation evaluates behavioral evidence, ownership, communication, trade-offs, and measurable outcomes in a realistic interview setting. A strong answer states assumptions, handles edge cases, explains trade-offs, and shows how to validate the result clearly.
Behavioral & LeadershipTechnical Screen - SalesforceMediumSoftware EngineerFewest Add-or-Subtract Power-of-Two Steps to Reduce n to Zero
An integer problem: reduce a positive n to zero with the fewest operations, where each operation adds or subtracts a power of two. It tests reasoning about binary representations, proving a strategy optimal, and working safely with integers larger than 32 bits.
Coding & AlgorithmsOnline Assessment - SalesforceMediumSoftware EngineerFewest Repeat-Free Pieces After Deleting Every Copy of One Letter
A string problem: delete every occurrence of one chosen lowercase letter, then split what remains into the fewest contiguous pieces with no repeated letters. It tests reasoning about optimal partitions, evaluating every deletion choice efficiently, and edge cases on strings up to 200,000 characters.
Coding & AlgorithmsOnline Assessment - 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 All Balanced Parenthesis Strings with n Pairs in Sorted Order
Return every balanced string made of n opening and n closing parentheses, for n up to 8, sorted in ascending lexicographic order. It tests systematic generation of combinatorial strings under a validity constraint, with an exact canonical ordering of the output.
Coding & AlgorithmsTechnical Screen
Salesforce