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AT&T Interview Questions, Process, and Tips

Updated 28 Feb 2025

Top AT&T Interview Questions and Answers

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AT&T Interview Experiences

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53 interviews found

Interview experience
3
Average
Difficulty level
Hard
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via Campus Placement and was interviewed in Mar 2023. There were 3 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all tips
Round 2 - Aptitude Test 

Basic verbal and quants easy to medium level

Round 3 - Technical 

(1 Question)

  • Q1. Projects explanation, coding and logical thinking questions

Java Full Stack Developer Interview Questions asked at other Companies

Q1. Coding question - 1. Create a immutable class of orders. What happens when two objects are created out of it. 2.Using the immutable orders create a set of orders and how will you sort these out. 3.Given a List of list of string of integers ... read more
View answer (1)
Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
-
Result
-
Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all tips
Round 2 - Aptitude Test 

Round 1
1.Quant
2.Verbal
3.Reasoning

Round 3 - Coding Test 

Round 2
1.Java code implementation
2.Sql query

Round 4 - Technical 

(1 Question)

  • Q1. Round 3 Detailed explanation of project
Round 5 - HR 

(1 Question)

  • Q1. 1.Long term goals 2.Situational questions

Interview Preparation Tips

Interview preparation tips for other job seekers - Having a good knowledge on Java and SQL is must. One must do some projects in their academics.

Technical Intern Interview Questions asked at other Companies

Q1. Coding question: Find the 2nd lowest and 2nd highest elements in an array
View answer (1)

Interview Questions & Answers

user image Anonymous

posted on 20 Apr 2022

I applied via Naukri.com and was interviewed in Mar 2022. There were 2 interview rounds.

Round 1 - Technical 

(14 Questions)

  • Q1. Informatica - Difference between router and filter transformation
  • Ans. 

    Router and filter transformations are used in Informatica for data filtering, but they have different functionalities.

    • Router transformation is used to route data based on specified conditions to multiple output groups.

    • Filter transformation is used to filter rows based on specified conditions and pass only the matching rows to the output.

    • Router transformation can have multiple output groups, each with its own condition.

    • ...

  • Answered by AI
  • Q2. Informatica - How can we handle duplicates in mappings
  • Ans. 

    Duplicates in mappings can be handled using various techniques in Informatica.

    • Use the Sorter transformation to sort the data and then use the Aggregator transformation to eliminate duplicates.

    • Use the Expression transformation with the DISTINCT keyword to remove duplicates.

    • Use the Rank transformation to rank the data and then filter out the duplicates based on the rank.

    • Use the Lookup transformation to check for duplicat...

  • Answered by AI
  • Q3. Informatica - How will you select last 10 lines from a file in mapping
  • Ans. 

    To select the last 10 lines from a file in Informatica mapping, use the Source Qualifier transformation with a SQL override.

    • Add a Source Qualifier transformation to the mapping.

    • In the Source Qualifier transformation, specify the file as the source and set the appropriate file properties.

    • Write a SQL override in the Source Qualifier transformation to select the last 10 lines from the file.

    • Use the ROWNUM pseudocolumn or t...

  • Answered by AI
  • Q4. Informatica - What are lookups and their types? Differences between those types in terms of input and output ports?
  • Ans. 

    Lookups in Informatica are used to retrieve data from a reference table based on a matching condition.

    • Lookups are used to perform data transformations and enrich the data in a mapping.

    • There are three types of lookups in Informatica: Connected, Unconnected, and Static.

    • Connected lookup returns multiple rows and can be used in any transformation.

    • Unconnected lookup returns a single value and is used in expressions or trans...

  • Answered by AI
  • Q5. Informatica - Tell me about your experience of performance optimization of workflows/mappings
  • Ans. 

    I have extensive experience in performance optimization of Informatica workflows and mappings.

    • Identifying and resolving performance bottlenecks

    • Tuning SQL queries and optimizing database connections

    • Optimizing transformations and reducing data processing time

    • Using partitioning and parallel processing for improved performance

    • Monitoring and analyzing session logs and performance statistics

    • Implementing caching and lookup op...

  • Answered by AI
  • Q6. Informatica - What is push down optimization?
  • Ans. 

    Push down optimization is a technique used in Informatica to improve performance by pushing data transformation operations to the source or target database.

    • Push down optimization reduces the amount of data transferred between the source and target systems.

    • It allows the database engine to perform transformations, aggregations, and filtering, leveraging its processing power.

    • By pushing down operations, Informatica minimiz...

  • Answered by AI
  • Q7. Unix - Display 10th line from a file
  • Ans. 

    Display the 10th line from a file in Unix.

    • Use the 'head' command to display the first 10 lines of the file.

    • Then use the 'tail' command to display the last line from the first 10 lines.

    • Combine both commands using a pipe ('|') to display the 10th line directly.

  • Answered by AI
  • Q8. Unix - Display duplicate lines from a file
  • Ans. 

    Display duplicate lines from a file in Unix.

    • Use the 'sort' command to sort the lines in the file.

    • Use the 'uniq' command with the '-d' option to display only the duplicate lines.

    • Redirect the output to a new file or display it on the console.

  • Answered by AI
  • Q9. Python - How to check if a string starts with letter 'a' and then has 4-8 'd' after that.
  • Ans. 

    The Python code to check if a string starts with 'a' and has 4-8 'd' after that.

    • Use the startswith() method to check if the string starts with 'a'.

    • Use the count() method to count the occurrences of 'd' in the string.

    • Check if the count of 'd' is between 4 and 8 (inclusive).

  • Answered by AI
  • Q10. Unix - how to find disk usage of a specific directory
  • Ans. 

    To find disk usage of a specific directory in Unix, use the 'du' command.

    • Open the terminal and navigate to the desired directory

    • Run the 'du' command followed by the directory path

    • The command will display the disk usage in bytes for each file and subdirectory within the specified directory

    • To get the disk usage in human-readable format, use the '-h' option with 'du'

    • To sort the output by disk usage, use the '-s' option wi

  • Answered by AI
  • Q11. SQL - what happens in a left join
  • Ans. 

    In a left join, all the rows from the left table are included in the result set, along with matching rows from the right table.

    • Left join returns all rows from the left table and the matching rows from the right table

    • If there is no match, NULL values are returned for the columns of the right table

    • Left join is used to retrieve data from multiple tables based on a related column

  • Answered by AI
  • Q12. Cloud Computing - Concepts of CapEx and OpEx
  • Q13. Cloud Computing - Concepts of IaaS, PaaS, SaaS
  • Q14. Cloud Computing - Concepts of Private, Public and Hybrid cloud
Round 2 - One-on-one 

(6 Questions)

  • Q1. Behavioral - How would you handle a scenario where client expectations haven't been met at the end of development period? Give an example if you have faced it.
  • Ans. 

    I would address the issue by identifying the root cause, communicating with the client, and implementing necessary changes.

    • Identify the reasons for not meeting client expectations

    • Communicate with the client to understand their concerns and expectations

    • Evaluate the development process and identify areas for improvement

    • Implement necessary changes to meet client expectations

    • Ensure effective communication and collaboration...

  • Answered by AI
  • Q2. Behavioral - How would you handle a scenario where a change in process has significantly impacted your team workings? Give an example if you have faced it.
  • Ans. 

    I would handle the scenario by following a structured approach and effectively communicating with the team.

    • Assess the impact of the change on team workings

    • Identify the key challenges and areas of concern

    • Develop a structured plan to address the issues

    • Communicate the plan to the team and seek their input

    • Implement the plan while providing necessary support and guidance

    • Monitor the progress and make adjustments as needed

    • Reg...

  • Answered by AI
  • Q3. Behavioral - How would you handle a scenario where a lot of interactions have to be done with different teams/stakeholders to complete the work? Give an example if you have faced it.
  • Ans. 

    I would handle the scenario by following a structured approach and effective communication.

    • Identify all the teams and stakeholders involved

    • Establish clear communication channels

    • Schedule regular meetings to discuss progress and address any issues

    • Document and track all interactions and decisions

    • Ensure everyone is aligned on goals and expectations

    • Provide regular updates and status reports

    • Resolve conflicts or disagreements...

  • Answered by AI
  • Q4. Cloud Computing - Why do you think Cloud is a better choice than on-premise datacenters
  • Ans. 

    Cloud computing offers scalability, cost-effectiveness, flexibility, and improved security compared to on-premise datacenters.

    • Scalability: Cloud allows easy scaling up or down of resources based on demand.

    • Cost-effectiveness: Cloud eliminates the need for upfront hardware and infrastructure investments.

    • Flexibility: Cloud enables easy access to data and applications from anywhere, anytime.

    • Improved security: Cloud provide...

  • Answered by AI
  • Q5. SQL - Tell me your experience with performance optimization in SQL
  • Ans. 

    I have extensive experience in performance optimization in SQL.

    • Identifying and optimizing slow queries

    • Creating and maintaining appropriate indexes

    • Using query execution plans to identify bottlenecks

    • Optimizing database schema and table design

    • Using appropriate data types and constraints

    • Caching and data caching techniques

    • Partitioning large tables

    • Optimizing query parameters and joins

    • Using stored procedures and views for per

  • Answered by AI
  • Q6. Questions from my past projects regarding the architecture of datawarehouses we had.

Interview Preparation Tips

Interview preparation tips for other job seekers - You need to have some fair knowledge on the technologies that you have specified. First round is going to be purely technical based on your skillset. Second round is going to be more behavioral/culture fit with technical questions more on the architecture and design side of things. Questions for this round will mostly depend on the role they hiring for (like developer/team leader/architect)

Skills evaluated in this interview

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Not Selected

I applied via LinkedIn and was interviewed before Oct 2023. There was 1 interview round.

Round 1 - HR 

(2 Questions)

  • Q1. Tell me about your self
  • Q2. Strength and weakness

Interview Preparation Tips

Interview preparation tips for other job seekers - Be well prepared

Technical Intern Interview Questions asked at other Companies

Q1. Coding question: Find the 2nd lowest and 2nd highest elements in an array
View answer (1)

AT&T interview questions for popular designations

 Network Engineer

 (4)

 Senior Manager

 (3)

 Technical Specialist

 (2)

 Intern

 (2)

 Technical Intern

 (2)

 Data Scientist

 (1)

 Senior Associate

 (1)

 Software Engineer

 (1)

Interview experience
4
Good
Difficulty level
Hard
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via LinkedIn and was interviewed before Aug 2022. There were 2 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all tips
Round 2 - Technical 

(2 Questions)

  • Q1. DataEngineering, ML, AI
  • Q2. Cloud Project implementation challenges.
  • Ans. 

    Cloud project implementation challenges include security concerns, integration issues, and lack of expertise.

    • Security concerns related to data privacy and compliance regulations

    • Integration issues with existing systems and applications

    • Lack of expertise in cloud technologies and best practices

    • Cost management and budget constraints

    • Data migration and transfer challenges

    • Vendor lock-in and interoperability issues

  • Answered by AI

Interview Preparation Tips

Topics to prepare for AT&T Senior Manager interview:
  • Highly complex Scenarios
Interview preparation tips for other job seekers - Have confidence and give a try.

Skills evaluated in this interview

Senior Manager Interview Questions asked at other Companies

Q1. 1. What you understand the requirement of shuttering material at project site?
View answer (19)

Get interview-ready with Top AT&T Interview Questions

Interview experience
5
Excellent
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Referral and was interviewed before May 2023. There was 1 interview round.

Round 1 - One-on-one 

(2 Questions)

  • Q1. Where do you see yourself in 5 years
  • Q2. Why did you leave your last company

Interview Preparation Tips

Interview preparation tips for other job seekers - Know your resume well

Senior Technical Specialist Interview Questions asked at other Companies

Q1. How to resolve the production issue whenever no clue is found.
View answer (3)

Jobs at AT&T

View all

Interview Questions & Answers

user image Anonymous

posted on 8 Mar 2023

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via LinkedIn and was interviewed before Mar 2022. There were 3 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all tips
Round 2 - Case Study 

Security related questions. Questions related to cryptography, SSL.

Round 3 - Technical 

(2 Questions)

  • Q1. Design an e-commerce app. Design a data structure to search for products and using type ahead field. The interviewer asked me to come-up with end to end diagram representing systems connected ans asked me ...
  • Ans. 

    Design an e-commerce app with type ahead search. Provide end to end diagram and scaling.

    • Design a user-friendly interface with search bar and type ahead feature

    • Create a database schema to store product information

    • Implement a search algorithm to retrieve relevant products based on user input

    • Use caching and indexing to improve search performance

    • Scale the system by adding load balancers, increasing server capacity, and opt

  • Answered by AI
  • Q2. Questions on content delivery and large scale distributed platforms.

Interview Preparation Tips

Interview preparation tips for other job seekers - For tech role, please prepare on system design. Scaling the system. And data structure.

Skills evaluated in this interview

Interview Questions & Answers

user image Anonymous

posted on 27 Oct 2023

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
4-6 weeks
Result
Not Selected

I applied via AT&T website and was interviewed before Oct 2022. There were 2 interview rounds.

Round 1 - Resume Shortlist 
Pro Tip by AmbitionBox:
Keep your resume crisp and to the point. A recruiter looks at your resume for an average of 6 seconds, make sure to leave the best impression.
View all tips
Round 2 - HR 

(2 Questions)

  • Q1. Tell me about a time where you had to learn something new
  • Q2. Tell me about a time where you challenged the status quo

Interview Questions & Answers

user image Rishabh Bhagchandani

posted on 6 Aug 2023

Interview experience
4
Good
Difficulty level
Moderate
Process Duration
2-4 weeks
Result
Selected Selected

I applied via Company Website and was interviewed before Aug 2022. There were 3 interview rounds.

Round 1 - Technical 

(1 Question)

  • Q1. Details on current job profile
Round 2 - One-on-one 

(1 Question)

  • Q1. Managerial round asking for shift
Round 3 - HR 

(1 Question)

  • Q1. Salary negotiations
Interview experience
4
Good
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
Selected Selected

I applied via Naukri.com and was interviewed in Mar 2022. There was 1 interview round.

Interview Questionnaire 

16 Questions

  • Q1. Introduce yourself
  • Q2. How many years of experience?
  • Q3. Are you technical or non technical?
  • Q4. Tell me your job Roles and responsibilities?
  • Q5. What is your current CTC?
  • Q6. What is your expected CTC?
  • Ans. 

    My expected CTC is negotiable based on the job responsibilities, company size, and location.

    • My expected CTC is based on my experience, skills, and industry standards.

    • I am open to discussing the compensation package during the interview process.

    • I am looking for a competitive salary that aligns with my qualifications and the market rate.

  • Answered by AI
  • Q7. What's your graduation?
  • Q8. What's your preferred job location?
  • Q9. You're from which state?
  • Q10. Do ready for technical round?
  • Q11. Once compete your technical round will let you know
  • Q12. What it is your notice period?
  • Q13. What's is your current company?
  • Q14. What's your job rol
  • Q15. Are you able to do rotational shifts?
  • Ans. 

    Yes, I am able to do rotational shifts as required for the job.

    • I am flexible with my work schedule and can adapt to different shifts

    • I have previous experience working in rotational shifts

    • I understand the importance of maintaining network operations 24/7, which may require working different shifts

  • Answered by AI
  • Q16. Are you able to night shift?

Network Engineer Interview Questions asked at other Companies

Q1. TCP/IP layers, why is transport needed for communication? What is Subnet mask and how does it help in data communication. Why is Vlan needed? Based on what information does a switch and router send a packet or frame? Types of arp, What is p... read more
View answer (2)

AT&T Interview FAQs

How many rounds are there in AT&T interview?
AT&T interview process usually has 2-3 rounds. The most common rounds in the AT&T interview process are Technical, HR and Resume Shortlist.
How to prepare for AT&T interview?
Go through your CV in detail and study all the technologies mentioned in your CV. Prepare at least two technologies or languages in depth if you are appearing for a technical interview at AT&T. The most common topics and skills that interviewers at AT&T expect are Information Technology, Python, WiFi, Product Management and SQL.
What are the top questions asked in AT&T interview?

Some of the top questions asked at the AT&T interview -

  1. Informatica - Difference between router and filter transformat...read more
  2. Informatica - How can we handle duplicates in mappi...read more
  3. Informatica - What are lookups and their types? Differences between those types...read more
How long is the AT&T interview process?

The duration of AT&T interview process can vary, but typically it takes about less than 2 weeks to complete.

Tell us how to improve this page.

AT&T Interview Process

based on 46 interviews

Interview experience

4
  
Good
View more

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AT&T Reviews and Ratings

based on 435 reviews

4.1/5

Rating in categories

3.7

Skill development

4.1

Work-life balance

4.2

Salary

3.7

Job security

4.0

Company culture

3.5

Promotions

3.8

Work satisfaction

Explore 435 Reviews and Ratings
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