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Updated weekly · Last refresh Oct 7

National Oilwell Varco Software Engineer Interview Questions

The questions to prepare for a National Oilwell Varco Software Engineer interview. Questions from real interview reports rank first. Updated daily.

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CodingStart here. 5 questions · ~43 min

Method Overloading vs OverridingEasy

Compare method overloading and method overriding in object-oriented programming, including binding, inheritance, and polymorphism.

javaabstractionoop

National Oilwell Varco

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Execution8 questions · ~69 min

Explain Your Job ChangeEasy

Answer why you are leaving your current job in a concise, professional way.

Trade-offsExecutionRisk Assessment

National Oilwell Varco

Handle One Million EmailsHard

Evaluates your system design and operational strategy for extreme email ingestion volume.

Problem Solvingscalability

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Security & Infrastructure3 questions · ~26 min

Welding Cable Layout in a DerrickMedium

Assesses your practical engineering judgment for cable routing and reliability in industrial equipment.

Infrastructure

National Oilwell Varco

Continuity Testing With a MultimeterMedium

Assesses practical electrical measurement skills and correct test procedure.

electrical testing

National Oilwell Varco

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SQL & Data Manipulation4 questions + 2 drills · ~55 min

SQL UNION Across TablesEasy

Practice

Combine distinct records from three tables using a PostgreSQL UNION query and return consistently ordered results.

data relationshipsJoinsData Manipulation

National Oilwell Varco

SCD Type 2 in WarehouseHard

Practice

Practice drill

Create versioned Roku customer and device records with effective timestamps and current-row indicators.

data managementtransactionsdata integrity

Roku

Data Lake vs Delta Lake and ACIDHard

Practice

Practice drill

Compare data lake assets with Delta tables and summarize committed operations demonstrating ACID behavior.

acid propertiessqldata integrity

v4c.ai

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Technical Fundamentals3 questions · ~26 min

Basic Electrical Circuit ConceptsEasy

Tests foundational understanding of electrical concepts relevant to engineering systems.

hardware integrationCommunication

National Oilwell Varco

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Behavioral & Leadership25 questions · ~217 min

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