NTT DATA Data Engineer interview questions & guide 2026

The questions you will encounter during the hiring process are designed to assess your practical coding skills, your understanding of data architecture, and your ability to collaborate in a consulting environment. These questions are drawn from real interview experiences across multiple global offices to help you identify patterns and key areas of focus.

SQL & Database Querying

As a Data Engineer, your ability to manipulate and retrieve data efficiently is critical. Expect live coding exercises and theoretical questions focused on database fundamentals.

• Write a SQL query to find the second-highest salary from an employee table without using the LIMIT clause.
• Explain the difference between a LEFT JOIN, INNER JOIN, and FULL OUTER JOIN, and describe a scenario where a FULL OUTER JOIN is necessary.

Preparing for an interview at NTT DATA requires a balanced approach. You must demonstrate strong technical foundations while showcasing the collaborative, client-ready communication style necessary for a global consulting environment.

Here are the key evaluation criteria our hiring teams use to assess candidates:

Technical Proficiency – You must show a deep understanding of core data engineering concepts, including database design, ETL/ELT pipeline construction, and distributed computing. Your ability to write clean, efficient code in Python and SQL is paramount.

Problem-Solving & System Design – Interviewers will evaluate how you approach ambiguous data challenges. You need to demonstrate a structured methodology for designing scalable, maintainable, and cost-effective data systems.

Collaboration & Group Dynamics – Because NTT DATA operates as a consultancy, your ability to work cohesively within a team is critical. You will be evaluated on your active listening, consensus-building, and communication skills during group assessments.

Client & Value Alignment – You should demonstrate an understanding of how technology drives business value. Showing adaptability, professional curiosity, and alignment with NTT DATA values will set you apart.

The interview process for a Data Engineer at NTT DATA is designed to evaluate both your technical capabilities and your interpersonal strengths. While the exact steps can vary slightly depending on the region and seniority level, the overall flow remains consistent, structured, and highly interactive.

The process typically begins with an initial HR screening, followed by a unique group assessment that evaluates your teamwork and communication. Successful candidates then move on to a rigorous technical evaluation, which may include live coding and system design discussions, before reaching the final offer stage.

The timeline above outlines the typical path a candidate takes from application to offer. It is structured to ensure that you are evaluated fairly on both your technical execution and your alignment with our collaborative culture. Candidates should use this timeline to pace their preparation, ensuring they dedicate equal focus to coding practice and behavioral readiness.

To excel in the Data Engineer interview process at NTT DATA, you must understand the specific competencies our interviewers look for. Below is a detailed breakdown of the primary evaluation areas.

SQL and Data Manipulation

Your ability to write optimized queries is tested thoroughly, often through live coding exercises where you must share your screen and write code in real-time.

Be ready to go over:

• Complex Joins and Aggregations – Combining multiple tables using conditional joins and grouping data to generate business insights.

As a Data Engineer at NTT DATA, your daily work will revolve around building the data pipelines and platforms that enable digital transformation. Your responsibilities will vary based on your specific client assignment, but core duties include:

• Pipeline Development – Designing, building, and maintaining automated ETL/ELT pipelines to ingest, transform, and load data from diverse sources into cloud data lakes and warehouses.
• System Optimization – Monitoring and tuning data workflows to ensure high performance, reliability, and cost efficiency.
• Cross-Functional Collaboration – Working closely with data scientists, business analysts, project managers, and client stakeholders to understand data requirements and deliver actionable data models.
• Cloud Migration Support – Assisting clients in transitioning their legacy on-premise data infrastructures to modern, secure, and scalable cloud environments.
• Data Governance & Security – Implementing data quality checks, access controls, and compliance standards to protect sensitive client information.

We look for candidates who possess a strong technical foundation coupled with the soft skills necessary to thrive in a consulting environment.

• Must-have skills

  • Strong proficiency in SQL for complex data manipulation and querying.
  • Solid programming skills in Python or Scala for data scripting and pipeline creation.
  • Hands-on experience with big data tools, specifically Apache Spark or Databricks.
  • Familiarity with at least one major cloud platform (Azure, AWS, or GCP).
  • Excellent communication skills, with the ability to articulate technical concepts clearly.

• Nice-to-have skills

  • Prior experience in a technical consulting or client-facing role.
  • Knowledge of containerization tools like Docker and Kubernetes.
  • Experience setting up CI/CD pipelines for data workflows.
  • Cloud or data engineering certifications (e.g., Databricks Certified Data Engineer, Azure Data Engineer Associate).

Q: How difficult is the technical interview at NTT DATA? A: The technical interview is generally rated as average in difficulty. It focuses heavily on foundational engineering principles, practical SQL queries, and basic Python scripting (often LeetCode Easy level), rather than highly abstract algorithmic puzzles.

Q: What is the purpose of the group interview round? A: The group interview is a key part of our evaluation. It is designed to assess your communication, teamwork, and problem-solving skills in a collaborative setting. We want to see how you interact with others, build consensus, and align with our core values.

Q: How long does the entire hiring process take? A: The process typically takes about three to four weeks from the initial HR screen to the final offer, depending on the location and specific team requirements.

Q: Will I be assigned to a single client or project? A: As a consultant at NTT DATA, you may work on a single large-scale project for an extended period or transition across different clients and technologies over time, providing excellent opportunities for varied experience.

• Prepare for Simple Coding Environments: Be ready to write code without an IDE. Practice writing clean SQL and Python code on a blank Google Doc or Word document to build confidence for shared-screen exercises.
• Emphasize Collaboration Over Dominance: In the group exercise, do not try to dominate the conversation. Instead, focus on facilitating discussion, summarizing points, and helping the group reach a structured decision.
• Connect Tech to Business Value: When explaining your past projects, don't just list the technologies used. Explain why you chose those tools and how your pipeline solved a specific business or client problem.
• Brush Up on Cloud Fundamentals: Be ready to discuss how your data pipelines deploy to the cloud. Knowing how to integrate Spark or Databricks with cloud storage (like AWS S3 or Azure ADLS) is highly valued.

A Data Engineer career at NTT DATA offers an exciting path to work on impactful, large-scale data challenges across a variety of industries. By mastering core database querying, refining your distributed systems knowledge, and demonstrating strong collaborative skills during the group assessments, you will position yourself as an exceptional candidate.

Ensure you spend time practicing live coding, reviewing Spark and Databricks fundamentals, and preparing structured behavioral examples that highlight your teamwork and adaptability. Focused preparation will give you the confidence to excel at every stage of the process.

To gain deeper insights, explore detailed salary ranges, and read more firsthand interview accounts from successful candidates, be sure to utilize the resources available on Dataford.

The compensation data above represents typical ranges for data engineering professionals. When reviewing these figures, consider that total compensation at NTT DATA may include base salary, performance bonuses, and local benefits, varying based on your geographic location, seniority, and specific client-facing responsibilities. Use this information to guide your compensation expectations during the final HR interview.