Dataford
Top 50
Company roadmap
Updated weekly · Last refresh Aug 30

CodeSignal Interview Questions

The questions to prepare for CodeSignal interviews, across all roles. Questions from real interview reports rank first. Updated weekly.

50questions
~7htotal time
Track your progressSign up free to work through all 50 questions and resume where you left off.
Start practicing free →
1
CodingStart here. 6 questions · ~53 min
Palindrome Function ImplementationEasy
Practice

Determine whether a string reads the same forward and backward using a two-pointer scan.

RecursionStringsTwo PointersCodeSignal
More Coding questions with a free account
2
Execution6 questions · ~53 min
Handle Conflict Within Your TeamEasy

Explain how you handle team conflict while keeping delivery on track and maintaining trust across stakeholders.

Trade-offsRisk AssessmentScope ManagementCodeSignal
More Execution questions with a free account

Sign up to see every question

Create a free account to unlock this list and practice real interview questions.

Get my prep plan
3
Metrics5 questions · ~44 min
Measure Marketing Campaign SuccessEasy

Define campaign success using business KPIs, funnel conversion, acquisition cost, and leading indicators tied to outcomes.

Funnel AnalysisKPIsLeading IndicatorsCodeSignal
More Metrics questions with a free account
4
Product Sense5 questions · ~44 min
Build an Engagement FeatureMedium

Approach for identifying, prioritizing, and launching a new feature that increases user engagement.

Feature PrioritizationUser NeedsUse CasesCodeSignal
More Product Sense questions with a free account
5
Machine Learning5 questions · ~44 min
Feature Engineering for New ModelsMedium

Explain a practical framework for feature engineering, from raw data review to validation of feature impact on held-out data.

Feature EngineeringModel EvaluationSupervised LearningCodeSignal
More Machine Learning questions with a free account
6
Sales & Customer5 questions · ~44 min
More Sales & Customer questions with a free account
7
More topics18 questions · ~158 min
Optimizing Slow Queries at ScaleHard
Recently asked

Explain how to diagnose and optimize a slow PostgreSQL query on large Apidel Technologies datasets.

SubqueriesJoinsData WranglingCodeSignal
Primary vs Guardrail MetricsEasy

Explain how a primary metric differs from a guardrail metric and how both are used in A/B test decisions.

ExperimentationGuardrail MetricsA/B TestingCodeSignal
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityCodeSignal
More questions with a free account
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Daily Session Funnel Conversion RatesHard
Practice
Practice drill

Calculate daily session-level funnel conversion rates using CTEs, CASE WHEN, and date functions.

User NeedsData WranglingAggregations
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
Unify CRM and Google Analytics ViewHard
Practice
Practice drill

Merge CRM orders with GA events via an identity map to build a customer-level view using joins, window functions, and monthly rollups.

SubqueriesJoinsData WranglingArtefact
The finish line: interview-readyComplete all 50 questions plus 3 hands-on drills to finish this plan.