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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
- Questions
- 546
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- 11
- Topics
- 8
- Languages
Showing 2071–2100 of 2336 results
- SpeakHardSoftware EngineerDesign speaking scenarios and auth/profile API
This question evaluates a candidate's ability to design scalable, real-time speaking-practice features and a minimal authentication/profile API, encompassing system architecture, service decomposition, data modeling, ASR/LLM integration, personalization, security and privacy, and operational concerns like scaling and observability.
System DesignOnsite - SpeakMediumSoftware EngineerImplement auth and profile APIs
This question evaluates backend API design competencies such as authentication and bearer-token access control, user profile data modeling, input validation, error handling, and state management for an in-memory service within the System Design category.
Software Engineering FundamentalsOnsite - Sprinter HealthMediumSoftware EngineerDesign a scalable game app store
This question evaluates a candidate's ability to design a scalable backend system, covering competencies in system architecture, data modeling, distributed services, media asset delivery, secure transactional flows, and operational trade-offs around scalability, availability, and consistency.
System DesignOnsite - SquareMediumSoftware EngineerBuild a Trust-Aware BIN Database
Build an in-memory card-prefix database that resolves brand and card type independently across overlapping writes. Practice combining longest-prefix matching with trust and recency rules while preserving omitted fields and supporting heavy lookup traffic.
Coding & AlgorithmsOnsite - SquareMediumSoftware EngineerExplain an AI-Assisted Engineering Workflow You Can Defend
Use one real project to explain the path from ambiguous requirements through design, implementation, launch, and maintenance, with AI assistance treated as a bounded tool. Show stakeholder alignment, decision trade-offs, independent verification, rejected output, and post-launch learning.
Behavioral & LeadershipOnsite - SquareMediumSoftware EngineerLead a High-Leverage Project in a Regulated Legacy System
Prepare a senior project deep dive spanning business leverage, personal ownership, delegation, architecture, migration, performance, reliability, and cost. Extend the analysis to regulated legacy systems where reconciliation, auditability, controlled rollout, and silent correctness failures matter.
Behavioral & LeadershipOnsite - SquarepointEasySoftware EngineerApply Insert, Update, and Remove Operations to a Keyed Store
Implement an in-memory key-value store processor that executes insert, update, and remove commands with strict handling for missing or duplicate keys, returning the final state in deterministic order.
Coding & AlgorithmsOnsiteHash MapDesignString - SquarepointEasySoftware EngineerExplain Database Indexes and Why Every Column Should Not Be Indexed
Explain database indexes, selective lookups, write overhead, composite keys, and why indexing every column can hurt a mixed workload.
Software Engineering FundamentalsOnsite - SquarepointEasySoftware EngineerExplain Python Immutability, Tuples, Hash Tables, and Caller-Level Errors
Practice Python tuple rebinding, shallow immutability, hash-table insertion and complexity, and caller-level handling of record-operation errors.
Software Engineering FundamentalsOnsite - StripeMediumSoftware EngineerAssign Reviewers from Changed Files
This question evaluates proficiency with version control diffs, repository library APIs, file I/O and CSV parsing, and data aggregation to map changed files to their owners.
Coding & AlgorithmsOnsite - StripeMediumSoftware EngineerBuild an Account Transfer Ledger
Design and implement an in-memory account ledger that supports deposits, transfers, and platform-backed lending with automatic debt repayment.
Coding & AlgorithmsOnsitedesignhash-tablestate-machine - StripeMediumSoftware EngineerCompute account balances with rejection and overdraft
This question evaluates stateful transaction processing and aggregation skills, including per-(account,currency) balance maintenance, timestamp-based ordering, rejection rules, and overdraft coverage via a platform account.
Coding & AlgorithmsOnsite - StripeMediumSoftware EngineerCompute balances with transaction fees and rejections
This problem tests the ability to manage stateful financial records while enforcing conditional logic, fee structures, and balance validation.
Coding & AlgorithmsOnsiteHash MapData ProcessingFinancial Logic - StripeMediumSoftware EngineerCompute currency conversions with graph algorithms
Stripe software-engineer onsite coding question: design data structures and algorithms to compute currency conversions from pairwise exchange rates. It tests modeling currencies as a weighted directed graph, chaining rates with BFS/DFS to answer queries (or -1 when unknown), supporting online updates and many queries efficiently, detecting contradictions and arbitrage in cycles, and computing all rates against a base via topological sort on a DAG, with time and space complexity analysis.
Coding & AlgorithmsOnsite - StripeMediumSoftware EngineerConnect JSON Coordinates Through a Documented Drawing API
Plan coordinate parsing and drawing-API integration with explicit geometry semantics, request mapping, error handling, and idempotent recovery.
Software Engineering FundamentalsOnsite - StripeMediumSoftware EngineerConvert bitmap into ASCII characters
This question evaluates skills in binary-to-text data representation, bitmap rendering, and efficient string and array manipulation for output formatting.
Coding & AlgorithmsOnsite - StripeHardSoftware EngineerDebug Validation Error Aggregation
Tests the ability to traverse nested validation error trees and normalize them into a flattened dictionary mapping dotted-path keys to aggregated lists of error messages.
Software Engineering FundamentalsOnsiteTree TraversalRecursionData Structures - StripeMediumSoftware EngineerDesign a Count-Metrics Monitoring Platform
Design a scalable count-metrics monitoring and alerting platform capable of tracking real-time event counts and rates, grouping by dimensional labels, handling duplicate/late events, and enforcing cardinality limits.
System DesignOnsiteDistributed SystemsObservabilityStream Processing - StripeHardSoftware EngineerDesign a Distributed Metrics Counter
This question tests the ability to architect a highly available, scalable system for ingesting and aggregating high-throughput telemetry data while managing trade-offs between consistency and performance.
System DesignOnsiteDistributed SystemsMetricsScalability - StripeMediumSoftware EngineerDesign a Merchant Ledger Service
This question tests your ability to design a distributed ledger system that ensures high transactional integrity, strict consistency for financial balances, and reliable idempotency in a high-concurrency environment.
System DesignOnsiteDistributed SystemsDatabase DesignConsistency - StripeMediumSoftware EngineerDesign a String-Rule Validator for Transaction Records
Specify transaction validation rules, parse them safely, evaluate name restrictions, and distinguish malformed input from ordinary rule rejection.
Software Engineering FundamentalsOnsite - StripeMediumSoftware EngineerDesign a Superhero Dispatch System
This question evaluates a candidate's ability to design reliable, distributed backend systems with emphasis on transactional correctness, concurrency control for single-winner acceptance races, geo-spatial querying for proximity matching, eventing/notification pipelines, and operational observability for mission-critical dispatch.
System DesignOnsite - StripeHardSoftware EngineerDesign ledger and bikemap integration
This question evaluates competency in designing strongly consistent financial ledgers and integrating an external routing service, testing data modeling, distributed transactions, linearizability and idempotency, scalability, security, API design, and observability in the System Design domain.
System DesignOnsite - StripeMediumSoftware EngineerDiscuss challenging project examples
Discuss challenging project examples 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 & LeadershipOnsite - StripeMediumSoftware EngineerDraw a Hiking Trail from GeoJSON with Markers and Color Bands
Parse a hiking trail out of a GeoJSON LineString, build the request payload for a map-snapshot API, save the returned PNG, and add start/finish markers plus alternating-color bands along the route.
Software Engineering FundamentalsOnsiteapi-integrationhttpjson - StripeMediumSoftware EngineerEvaluate Ordered Accept/Block Transaction Rules with AND, OR and Parentheses
A three-part Python exercise, solved with an in-editor AI assistant, that evaluates an ordered list of accept or block rules against a transaction. Conditions grow from string equality to Boolean fields, AND and OR, and parentheses, testing tokenizing quoted values, operator precedence, first-match semantics and careful review of AI-written code.
Software Engineering FundamentalsOnsite - StripeMediumSoftware EngineerFind deployable slots in a recurring week from allowed and freeze windows
A coding exercise on a recurring 10,080-minute week: combine allowed and freeze deployment windows into deployable slots, then add per-window time-zone offsets, the current time, a lead time, a minimum slot length and a cap of k results. It tests interval merging and subtraction, wrap-around at the week boundary and careful edge-case handling.
Coding & AlgorithmsOnsite - StripeMediumSoftware EngineerFirst-Match Login Policy Engine with a Boolean Expression DSL
Implement an ordered allow/deny policy evaluator for sign-in attempts whose conditions grow from symmetric string equality to boolean flags, and/or precedence, parentheses, not and !=. Tests tokenizing quoted literals, recursive-descent parsing, first-match semantics, and missing-field handling.
Software Engineering FundamentalsOnsiteparsingrecursive-descenttokenizer - StripeMediumSoftware EngineerFix Seekable POST Body Replay After a 307 Redirect in Python requests
A debugging exercise in the Python requests library: POST requests whose body is a seekable stream time out after an HTTP 307 redirect, while a plain string body works. It tests tracing how request state changes between the first send and the redirect, and fixing the library so that streams the caller has already partly read are resent correctly.
Software Engineering FundamentalsOnsite - StripeMediumSoftware EngineerFix an HTTP Client That Loses a Stream Body on Redirect Replay
Debug a small HTTP client library where POST requests with a plain string body replay correctly after a redirect, but requests with a file-like stream body hang, and fix the library so a redirect resends the exact original bytes, including bytes from a stream the caller had already partly consumed.
Software Engineering FundamentalsOnsitedebugginghttpstreams
Square
Squarepoint
Stripe