01Information Technology
NVIDIA Corporation
United States
NVIDIA supplies accelerated-computing hardware and software used in AI, graphics and other computing workloads.
Open company practiceTHE LEARNING HUB / INTERVIEW PREP
Prepare for your
next technical interview.
Practice the reasoning behind a strong answer. Explore company context, work through technical questions, and test your code against visible expectations.
Original practice written for this site. Company-context prompts are not verified questions from company interviews.
01 / UNDERSTAND THE BUSINESS
Start with a company.
Each profile connects real business context with two original practice questions and suggested technical exercises.
How this company list was chosen
Company profiles follow PwC Global Top 100 companies by market capitalisation, 2026, as of .
The 100 public companies ranked by US-dollar market capitalisation at 31 March 2026 in PwC’s report, using S&P Global Market Intelligence data and PwC analysis. Country or region follows the report’s headquarters location; sector follows its primary sector classification. This dated financial-size list is a practice browsing aid, not a ranking of employers, hiring activity or interview difficulty. All questions are original company-context practice scenarios; none is claimed to have been asked by a company.
Company names provide business context for independent practice. Question selection and suggested tracks are editorial choices for this learning resource.
Showing 12 of 100 companies
02Information Technology
Apple Inc.
United States
Apple develops consumer devices, operating systems and services that connect hardware and software experiences.
Open company practice03Communication Services
Alphabet Inc
United States
Alphabet is the parent of Google and other businesses spanning online services, cloud computing and technology research.
Open company practice04Information Technology
Microsoft Corporation
United States
Microsoft develops software, cloud services and productivity tools for consumers and organizations.
Open company practice05Consumer Discretionary
Amazon.com, Inc.
United States
Amazon operates retail, logistics, digital services and the AWS cloud-computing business.
Open company practice06Energy
Saudi Arabian Oil Company
Saudi Arabia
Aramco operates energy and chemicals businesses across oil production, processing and related supply chains.
Open company practice07Information Technology
Broadcom Inc
United States
Broadcom supplies semiconductor and infrastructure-software products for networking, computing and enterprise systems.
Open company practice08Communication Services
Meta Platforms, Inc.
United States
Meta develops social and messaging applications alongside AI and immersive-computing technologies.
Open company practice09Information Technology
Taiwan Semiconductor Manufacturing Company Limited
Taiwan
TSMC manufactures semiconductor products for customers through its dedicated foundry business.
Open company practice10Consumer Discretionary
Tesla, Inc.
United States
Tesla develops electric vehicles, charging infrastructure and energy generation and storage products.
Open company practice11Financials
Berkshire Hathaway Inc
United States
Berkshire Hathaway owns businesses across insurance, transportation, energy, manufacturing and other sectors.
Open company practice12Consumer Staples
Walmart Inc.
United States
Walmart operates retail stores and digital commerce serving customers across multiple markets.
Open company practiceNo matches yet.
Try a shorter search or clear your filters to browse all companies.
Browse all company profiles
- NVIDIA Corporation
- Apple Inc.
- Alphabet Inc
- Microsoft Corporation
- Amazon.com, Inc.
- Saudi Arabian Oil Company
- Broadcom Inc
- Meta Platforms, Inc.
- Taiwan Semiconductor Manufacturing Company Limited
- Tesla, Inc.
- Berkshire Hathaway Inc
- Walmart Inc.
- Eli Lilly and Company
- JPMorgan Chase & Co
- Exxon Mobil Corporation
- Samsung Electronics Co., Ltd.
- Johnson & Johnson
- Visa Inc.
- Tencent Holdings Limited
- ASML Holding N.V.
- Mastercard Incorporated
- Costco Wholesale Corporation
- Oracle Corporation
- Chevron Corporation
- Netflix, Inc.
- AbbVie Inc.
- Micron Technology, Inc.
- Industrial and Commercial Bank of China Limited
- SK hynix Inc.
- Palantir Technologies Inc.
- Bank of America Corporation
- The Procter & Gamble Company
- Agricultural Bank of China Limited
- Advanced Micro Devices, Inc.
- Caterpillar Inc.
- The Home Depot, Inc.
- The Coca-Cola Company
- PetroChina Company Limited
- Roche Holding AG
- Cisco Systems, Inc.
- AstraZeneca PLC
- Merck & Co., Inc.
- General Electric Company
- Novartis AG
- China Construction Bank Corporation
- Alibaba Group Holding Limited
- HSBC Holdings plc
- Applied Materials, Inc.
- Contemporary Amperex Technology Co., Limited
- Lam Research Corporation
- Shell plc
- LVMH Moët Hennessy - Louis Vuitton, Société Européenne
- Kweichow Moutai Co., Ltd.
- Morgan Stanley
- RTX Corporation
- The Goldman Sachs Group, Inc.
- Toyota Motor Corporation
- Philip Morris International Inc.
- Bank of China Limited
- Nestlé S.A.
- Wells Fargo & Company
- UnitedHealth Group Incorporated
- GE Vernova Inc.
- International Holding Company PJSC
- T-Mobile US, Inc.
- Linde plc
- International Business Machines Corporation
- Royal Bank of Canada
- China Mobile Limited
- Intel Corporation
- McDonald's Corporation
- L'Oréal S.A.
- PepsiCo, Inc.
- Verizon Communications Inc.
- American Express Company
- AT&T Inc.
- TotalEnergies SE
- Citigroup Inc.
- SAP SE
- Hermès International Société en commandite par actions
- Reliance Industries Limited
- NextEra Energy, Inc.
- KLA Corporation
- Commonwealth Bank of Australia
- Amgen Inc.
- Mitsubishi UFJ Financial Group, Inc.
- Siemens Aktiengesellschaft
- Thermo Fisher Scientific Inc.
- Abbott Laboratories
- Deutsche Telekom AG
- Industria de Diseño Textil, S.A.
- The TJX Companies, Inc.
- Texas Instruments Incorporated
- CNOOC Limited
- BHP Group Limited
- Gilead Sciences, Inc.
- Salesforce, Inc.
- The Walt Disney Company
- The Charles Schwab Corporation
- Intuitive Surgical, Inc.
02 / BUILD YOUR REASONING
Understand the answer.
260 explained questions and 24 coding exercises. Open a question for its worked answer, tradeoffs and pitfalls to discuss.
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Showing 12 of 284 practice items
Software engineering
Choose the right hash-map invariant
Concept
Given a list of integers and a target, explain how to find two distinct positions whose values add to the target. What changes if you must return every pair?
Read full answerSoftware engineering
Explain when a sliding window is valid
Concept
How would you find the longest substring containing no repeated characters, and what invariant makes the linear-time approach work?
Read full answerSoftware engineering
Find a boundary with binary search
Concept
Explain a search that returns the first position whose sorted value is at least a target, including an empty array and a target greater than every value.
Read full answerSoftware engineering
Merge ordered event streams
Concept
Two event lists are sorted by timestamp. How would you merge them while preserving order when timestamps tie?
Read full answerSoftware engineering
Detect a directed dependency cycle
Concept
How would you determine whether a build dependency graph contains a directed cycle and return a useful explanation?
Read full answerSoftware engineering
Keep the largest k items in a stream
Concept
Explain how to retain the largest k values when the stream cannot be sorted or stored in full.
Read full answerSoftware engineering
Design a bounded LRU cache
Concept
Describe an LRU cache supporting get and put in expected O(1) time. What must remain consistent after every operation?
Read full answerSoftware engineering
Bound asynchronous concurrency
Concept
You need to process100 URLs with at most five requests active. Explain why Promise.all over100 fetch calls does not impose that limit.
Read full answerSoftware engineering
Make input mutation an explicit contract
Concept
A helper sorts an array before calculating a result. What would you discuss before using it in a shared codebase?
Read full answerSoftware engineering
Define what a character means
Concept
An interviewer asks you to reverse a string. What assumptions about Unicode should you clarify before writing a loop?
Read full answerSoftware engineering
Avoid a read-modify-write race
Concept
Two requests both read an inventory count of1 and both decrement it. How would you enforce the rule that inventory never becomes negative?
Read full answerSoftware engineering
Test behavior rather than implementation
Concept
How would you test a function that groups and sorts customer events without making the tests depend on its internal data structure?
Read full answerNo matches yet.
Try a shorter search or clear your filters to browse all practice items.
Browse all practice questions and exercises
- Choose the right hash-map invariant
- Explain when a sliding window is valid
- Find a boundary with binary search
- Merge ordered event streams
- Detect a directed dependency cycle
- Keep the largest k items in a stream
- Design a bounded LRU cache
- Bound asynchronous concurrency
- Make input mutation an explicit contract
- Define what a character means
- Avoid a read-modify-write race
- Test behavior rather than implementation
- Separate retrieval failure from generation failure
- Choose document chunk boundaries
- Build a generative-answer evaluation set
- Choose and evaluate an embedding similarity
- Detect leakage in a model pipeline
- Treat retrieved instructions as untrusted data
- Validate model-generated structured data
- Reduce AI latency with a measurable budget
- Choose prompting, retrieval or fine-tuning
- Design a reliable agent tool contract
- Monitor a model after deployment
- Make abstention useful and testable
- Choose precision and recall for the task
- Choose a realistic validation split
- Design an A/B test before looking at results
- Explain why an observed lift may not be causal
- Handle missing values without leaking information
- Distinguish ranking from calibration
- Bootstrap the right observational unit
- Backtest a forecast without looking ahead
- Define a retention cohort before writing a query
- Explain feature importance carefully
- Investigate training-serving population mismatch
- Diagnose an aggregate metric change
- Prevent a join from inflating totals
- Handle NULL in an anti-join
- Choose the correct top-N semantics
- Make a running total's frame explicit
- Select a complete latest record
- Build a defensible retention query
- Deduplicate events without erasing corrections
- Represent money and rates deliberately
- Choose the right time for a reporting bucket
- Explain why an index may not help
- Protect a multi-row invariant
- Distinguish snapshot reads from serializable behavior
- Start a design with workload and SLOs
- Prevent a cache stampede
- Make an operation safe to retry
- Design retries that do not amplify an outage
- Handle an expanding work queue
- Choose a rate-limit contract
- Choose a partition key with skew in mind
- Choose consistency from an invariant
- Observe the user journey across services
- Make a recovery plan testable
- Keep authorization at the resource boundary
- Evolve an event schema without breaking consumers
- Admit inference jobs without exhausting accelerator memory
- Compare accelerator kernels fairly
- Reconcile edits from offline devices
- Evaluate an on-device classifier under resource limits
- Keep a search index fresh through source deletions
- Separate ranking quality from position bias
- Maintain a shared document through retries
- Revoke access across cached enterprise services
- Reserve scarce stock without overselling
- Count shipped orders without multiplying package rows
- Distinguish missing sensor data from quiet equipment
- Prioritize maintenance alerts with limited inspection capacity
- Schedule packet queues without starving a small flow
- Reconcile virtual-machine inventory with software entitlements
- Propagate a user deletion through derived stores
- Learn from a hide action without overgeneralizing
- Trace wafer-lot lineage through splits and merges
- Estimate yield when inspection coverage differs
- Reconcile a charging session after connectivity loss
- Compute vehicle telemetry windows without future leakage
- Consolidate subsidiary reports without losing local meaning
- Evaluate predictions with immature insurance outcomes
- Coordinate grocery substitutions with customer decisions
- Measure a promotion when stores start with different demand
- Build an auditable clinical-study observation table
- Validate condition-monitoring records for a medicine shipment
- Post a transfer exactly once under retry
- Evaluate a fraud-review ranking with delayed labels
- Reconcile fuel movements reported in different units
- Compare fuel-demand forecasts at a real ordering horizon
- Roll out firmware across heterogeneous device models
- Choose a representative device test matrix
- Group duplicate device issue reports without losing evidence
- Measure product adoption when accounts and sites differ
- Handle authorization reversals that arrive out of order
- Calculate dispute rates with matching denominators
- Replay game events without duplicating player rewards
- Route multilingual content to a limited review queue
- Recover a machine-service command after a lost acknowledgment
- Detect calibration drift without confusing a product-mix change
- Accept a clearing batch without silently losing records
- Evaluate a transaction-network model without sharing future edges
- Verify membership during a temporary store-network outage
- Compare sales when package sizes change
- Migrate a multi-tenant schema without breaking older clients
- Diagnose a query slowdown after the data distribution changes
- Keep an equipment-work approval valid after the plan changes
- Measure inspection completion without rewarding omitted assets
- Recover video playback when a content edge fails
- Design a recommendation experiment with shared viewing
- Separate compound effects from laboratory plate effects
- Retrieve the correct version of a research protocol
- Represent a sparse memory-test defect map
- Compare memory-test escape rates with unequal coverage
- Prevent duplicate branch appointments after a reschedule
- Join transactions to the status valid when they occurred
- Validate a memory-module configuration against dependencies
- Calculate yield without averaging incompatible percentages
- Unify entity records while keeping uncertain links reversible
- Assemble a decision snapshot without using future knowledge
- Paginate account activity while new postings arrive
- Evaluate transaction categorization with changing merchant text
- Release packaging artwork against the correct product version
- Reconcile demand forecasts across products and regions
- Import branch records without corrupting account identifiers
- Forecast rural-service demand around a changing calendar
- Schedule a processor-toolchain build from its dependencies
- Decode a versioned hardware-capability record
- Reconcile service work recorded while equipment is offline
- Calculate equipment utilization from hour-meter readings
- Plan board cuts with a clear optimality claim
- Offer delivery slots for orders with bulky products
- Reconcile returnable containers separately from beverage sales
- Distinguish distributor ordering from consumer demand
- Detect conflicting pipeline transfer windows
- Aggregate gas-quality readings using compatible weights
- Match diagnostic result messages to the correct specimen
- Evaluate a diagnostic-model score under population change
- Roll out network configuration with recoverable checkpoints
- Detect unusual network activity without treating every burst as hostile
- Measure a research-site onboarding funnel with incomplete follow-up
- Avoid counting several reports of one study as independent evidence
- Evolve a controlled research vocabulary without rewriting history
- Report usable inventory by expiry and disposition state
- Track a serialized engine component through installations
- Forecast service workload from an evolving installed base
- Enforce study-data access when permitted use changes
- Resolve research compound mentions without guessing an identity
- Explain missing documents without making an approval decision
- Aggregate facility and collateral records without duplicating exposure
- Compose marketplace promotions with explicit scope
- Evaluate catalog search across languages and measurement systems
- Schedule an international instruction across local cutoffs
- Join financial records to an explicit conversion-rate version
- Evolve equipment event fields without changing their meaning silently
- Evaluate a chamber-scheduling policy with a transparent simulation
- Compare battery-test curves with unequal observation windows
- Separate charge and discharge in a storage-energy report
- Compare manufacturing recipes with meaningful numeric tolerances
- Design a process experiment when lots share a chamber
- Distinguish sensor drift from a process change
- Reconstruct a hypothetical energy dispatch decision
- Resolve product variants across luxury catalogs
- Forecast demand when scarce items sell out
- Track bottle batches through corrections
- Compare distributor shipments without double counting
- Produce a consistent hypothetical portfolio view
- Retrieve authorized passages from a synthetic research library
- Answer from versioned synthetic maintenance manuals
- Allocate scarce spare parts deterministically
- Reconcile a simulated order lifecycle
- Distribute a reproducible risk calculation
- Reconstruct a synthetic vehicle event timeline
- Evaluate visual inspection across production lines
- Preserve authorization across a restricted storefront
- Analyze feedback from a self-selected survey
- Track a simulated cross-border transfer
- Reconcile multi-currency ledger entries
- Version a synthetic ingredient and label graph
- Separate promotion uplift from seasonal demand
- Reconcile deposits that cross reporting boundaries
- Evaluate a synthetic transaction-alert model with delayed labels
- Count synthetic claims after adjustments
- Test a synthetic document-redaction pipeline
- Handle gaps in synthetic grid telemetry
- Backtest wind-generation forecasts across sites
- Model a changing synthetic ownership hierarchy
- Compare business-unit metrics without misleading totals
- Keep a simulated mobile session stable through handovers
- Estimate synthetic coverage from biased device reports
- Reconcile a synthetic reusable-cylinder fleet
- Validate a constrained synthetic delivery route
- Isolate tenant-specific retrieval caches
- Evolve an enterprise event contract gradually
- Generate reproducible synthetic account statements
- Evaluate a bilingual synthetic support assistant
- Roll up synthetic telecom counters correctly
- Recover a synthetic telecom activation workflow
- Evaluate synthetic processor benchmark regressions
- Prevent leakage in synthetic wafer-defect modeling
- Price a synthetic restaurant order deterministically
- Test a synthetic kitchen scheduling change
- Evaluate a synthetic cosmetic-shade recommender
- Retrieve approved synthetic product claims by market
- Allocate synthetic stock with expiry constraints
- Measure synthetic on-shelf availability without visit bias
- Correlate a synthetic telecom incident storm
- Forecast synthetic network demand with changing coverage
- Make a synthetic rewards ledger reversible
- Evaluate a synthetic merchant offer without redemption bias
- Make usage replay billable once
- Count outage impact at the subscriber grain
- Evaluate an operational renewable forecast
- Compare terminal delays fairly
- Handle a timed-out payment request
- Fail over a balance display responsibly
- Join an order to its historical customer segment
- Evolve an enterprise extension contract
- Reserve a scarce retail item
- Estimate demand when products sell out
- Match products across business catalogs
- Compare promotion baskets without join inflation
- Choose forecast origins for electricity demand
- Apply corrected meter readings deterministically
- Evaluate a rare-defect inspection model
- Preserve inspection results under backpressure
- Evaluate a simpler onboarding flow
- Reconstruct a statement as of its cutoff
- Make a batch review record immutable
- Detect leakage in assay prediction
- Aggregate a ledger without mixing currencies
- Coordinate business-day cutoffs across regions
- Evolve a device telemetry protocol
- Separate sensor drift from process change
- Trace a laboratory result to its inputs
- Find samples missing a required processing stage
- Evaluate a model with missing device inputs
- Define a diagnostic retest metric
- Invalidate a customer-plan cache
- Search a sorted service-range table
- Attribute returns to a purchase cohort
- Interpret an experiment that changes availability
- Forecast demand with changing assortment
- Apply price schedules at exact boundaries
- Collect high-rate test equipment events
- Distinguish first-pass from final yield
- Summarize irregular sensor readings
- Recover an offline field-data buffer
- Plan routes with changing operational constraints
- Validate predictions across geological areas
- Count research outcomes without duplicating participants
- Evaluate a research evidence assistant
- Schedule tenant jobs fairly
- Propagate revoked record access
- Choose an experiment unit for shared accounts
- Resolve streaming entitlement updates
- Reconstruct positions at an as-of boundary
- Display quotes with explicit freshness
- Keep diagnostic telemetry off a critical path
- Evaluate a support model across equipment versions
- Find the first two-sum pair
- Validate nested delimiters
- Merge inclusive intervals
- Find a longest unique window
- Locate the first matching index
- Find an unweighted grid route
- Order dependency tasks deterministically
- Report each sliding-window maximum
- Normalize a numeric feature
- Score a thresholded classifier
- Evaluate retrieval with duplicate slots
- Compute a vector similarity safely
- Aggregate a feature by group
- Keep the latest entity record
- Build an ordered confusion matrix
- Split rows without splitting groups
- Include customers with no orders
- Select each user's latest event
- Summarize signed paid revenue
- Find tickets with no replies
- Compute account running balances
- Keep the top two salary bands
- Measure next-calendar-month retention
- Avoid multiplying one-to-many joins
03 / MOVE FROM ANSWER TO EVIDENCE
Write it.
Run it. Review it.
One focused editor, visible test inputs, and actual versus expected output. Work in JavaScript, Python or SQL, then inspect a public solution when you are ready.
Enter the coding labCoding execution requires JavaScript. Exercise prompts, test cases and solutions remain readable without it.
Find the first two-sum pair / STARTER CODE
function solve(input) {
// Return a JSON-compatible value.
return null;
}
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