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Updated weekly · Last refresh Aug 30

Coding it Forward Software Engineer Interview Questions

The questions to prepare for a Coding it Forward Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

30questions
~4htotal time
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1
CodingStart here. 7 questions · ~60 min
Longest Substring Without RepeatsMedium
Practice

Find the longest substring with all unique characters using a sliding window.

Hash TablesStringsTwo PointersCoding it Forward
Programming Languages and RationaleEasy

Tests your technical fit and your ability to justify language choices based on constraints.

MathArraysStringsCoding it Forward
REST vs GraphQL APIsEasy

Tests your understanding of API design tradeoffs and how to choose the right approach.

Hash TablesStringsSearchingCoding it Forward
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2
Execution20 questions · ~173 min
Solve a Challenging Technical ProblemEasy

Describe a difficult technical problem you solved, focusing on execution, stakeholder alignment, risks, and trade-offs.

Trade-offsRisk AssessmentCoding it Forward
Explain Technical Work to Business StakeholdersMedium

Show how you translate technical concepts into clear business language for non-technical stakeholders during project execution.

Stakeholder ManagementTechnical FluencyCommunicationCoding it Forward
Prioritize Across Competing Data ProjectsEasy

Explain how you prioritize across multiple concurrent data engineering projects with competing stakeholder needs and limited capacity.

Trade-offsRoadmappingScope ManagementCoding it Forward
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3
More topics3 questions · ~26 min
E-Commerce Database Schema DesignHard

Tests your data modeling skills, normalization tradeoffs, and support for common e-commerce queries.

JoinsGroup ByData ModelingCoding it Forward
Interactive Public Data MapHard

Evaluates system design choices for building a high-performance, interactive public data map.

Coding it Forward
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Resolve Conflicting Customer AttributesMedium
Practice
Practice drill

Use joins, CTEs, and row ranking to resolve conflicting customer profile values across ACME House systems.

JoinsData WranglingQualityRamsey SolutionsACME House
Reconcile Conflicting Invoice TotalsMedium
Practice
Practice drill

Reconcile billing and ERP invoice totals using joins, a CTE for latest snapshots, and CASE-based discrepancy classification.

JoinsData WranglingQualityLiterati
The finish line: interview-readyComplete all 30 questions plus 3 hands-on drills to finish this plan.