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CodeSignal-style assessment prep

CodeSignal practice problems, ready to solve.

Start with 20 high-frequency problems from the public FastPrep catalog, then open the complete CodeSignal-filtered problem list.

20-problem previewCodeSignal filteredPublic catalog only
CodeSignal problem preview
346 problems with explicit CodeSignal evidence

20 problems for CodeSignal practice

Ranked by repeated public catalog sightings. Start with any problem below.
Show all problems

20 CodeSignal practice problems loaded.

CompanyProblemDifficultyPublic evidenceAction
GOGoogle
Split and Sort ArrayArraySortingMedium9 public reportsLatest Sep 2026Practice
ANAnthropic
Cloud Storage SystemDesignHash TableMedium9 public reportsLatest Aug 2026Practice
GOGoogle
Minimum Absolute SumArrayGreedyEasy6 public reportsLatest Sep 2026Practice
COCapital One
Rectangle Fit QueriesArrayGeometryMedium4 public reportsLatest Sep 2026Practice
TITiktok
Leftmost Memory Block Allocator (for mle also :)ArraySimulationMedium4 public reportsLatest Sep 2026Practice
TITiktok
Count Even-Digit NumbersArrayMathEasy4 public reportsLatest Aug 2026Practice
TITiktok
Reverse Letters in PairsStringTwo PointersEasy4 public reportsLatest Sep 2026Practice
TITiktok
Find Sum Pairs (for mle also :)ArrayHash TableMedium4 public reportsLatest Aug 2026Practice
TITiktok
Count House Segments After DestructionArrayHash TableMedium4 public reportsLatest Aug 2026Practice
ANAnthropic
Worker Management, Part 1: Office RegistrationHash TableDesignEasy4 public reportsLatest May 2026Practice
ANAnthropic
Worker Management, Part 2: Top WorkersHash TableSortingMedium4 public reportsLatest May 2026Practice
ANAnthropic
Worker Management, Part 3: Promotions and SalaryHash TableIntervalsHard4 public reportsLatest May 2026Practice
ANAnthropic
Worker Management, Part 4: Double-Paid IntervalsHash TableIntervalsHard4 public reportsLatest May 2026Practice
TITiktok
TikTok Shopping SpreeGreedySortingEasy4 public reportsLatest Mar 2025Practice
HRHudson River Trading
Rightmost Longest Character RunStringTwo PointersEasy3 public reportsLatest Sep 2026Practice
COCapital One
Round-Robin WDL OrderStringSimulationEasy3 public reportsLatest Sep 2026Practice
COCapital One
Inventory Discount TrackerHash TableSimulationMedium3 public reportsLatest Sep 2026Practice
COCapital One
Rank Flights by Airline and Destination FrequencyDatabaseSortingEasy3 public reportsLatest Aug 2026Practice
AIAirbnb
Worker Management, Part 3: Overtime RulesHash TableSortingHard3 public reportsLatest Aug 2026Practice
AIAirbnb
Worker Management, Part 4: Worker MergeHash TableSortingHard3 public reportsLatest Aug 2026Practice
Showing 20 of 346 public CodeSignal matchesShow all problems

  • CodeSignal filter

    Start with problems backed by explicit platform evidence.

  • Readable prompts

    Review examples and constraints before you implement.

  • Run your code

    Execute a solution in the FastPrep workspace.

  • Custom cases

    Probe edge conditions beyond the visible examples.

Useful recommendations need a reason.

The preview stays useful without pretending FastPrep has official access to CodeSignal questions or private tests.

  1. 01

    Public evidence first

    Every previewed problem has explicit CodeSignal-tagged assessment evidence in FastPrep's public catalog.

  2. 02

    Platform claims stay explicit

    A platform appears only when the catalog includes supporting assessment evidence.

  3. 03

    Practice stays transferable

    Work on implementation, constraints, examples, and edge cases—not copied private tests.

Keep the assessment attached to the opportunity.

Check public company hiring signals before you prioritize a set, then keep the assessment deadline and recruiter follow-up beside the rest of your search.

Explore hiring insightsOpen the application tracker

Other assessment practice hubs

HackerRank practiceCodility practiceKarat practice

What candidates should know.

Straight answers about the data, CodeSignal evidence, and what this practice is—and is not.

01Is FastPrep affiliated with CodeSignal?

No. FastPrep is an independent interview preparation and application tracking product. This page previews public catalog entries with explicit supporting CodeSignal evidence.

02Does FastPrep provide official or private CodeSignal questions?

No. FastPrep does not provide official, private, leaked, or proprietary CodeSignal questions. Practice sets are built from FastPrep's public problem catalog and are intended to develop transferable coding assessment skills.

03How are the preview problems selected?

FastPrep shows 20 public assessment problems with explicit CodeSignal evidence, ordered by repeated public catalog sightings. Use the full problem list for additional filters and problems.

04What should I practice before a CodeSignal-style assessment?

Practice timed implementation with arrays and strings, hash maps, sorting, binary search, graph basics, and careful translation of constraints into working code. Use custom cases to check edge conditions before submitting.

05How can I see every CodeSignal practice problem?

Select Show all problems above or below the preview table. The full problem list opens with the CodeSignal filter already applied.

Your next useful action

Open one problem. Keep moving.

A focused practice session beats another generic preparation checklist.

View practice problems