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AT&T Data Engineer Interview Questions and Answers
AT&T Data Engineer Interview Experiences
1 interview found
Anonymous
I applied via LinkedIn and was interviewed in Jun 2024. There was 1 interview round.
(3 Questions)
- Q1. Sql question related to windows function
- Q2. Unix basics - find a word in a set of files
- Ans.
Using Unix command 'grep' to find a word in a set of files
Use 'grep' command followed by the word you want to search for and the file(s) you want to search in
Add the '-r' flag to search recursively in all files in a directory
Use '-i' flag for case-insensitive search
Example: grep 'hello' file.txt
Example: grep -r 'error' /path/to/directory
Example: grep -i 'apple' file1.txt file2.txt
- Q3. Python question related to file system, regex
Interview Preparation Tips
Skills evaluated in this interview
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Shubham Chandra
I was interviewed before Sep 2016.
Interview Questionnaire
16 Questions
- Q1. On what technology you have worked?
- Ans.
I have worked on various technologies including Java, Python, AWS, Docker, and Kubernetes.
Java
Python
AWS
Docker
Kubernetes
- Q2. Case studies of daily operational activities?
- Ans.
Daily operational activities case studies
Case study of optimizing production line for efficiency
Case study of implementing new safety protocols in a manufacturing plant
Case study of troubleshooting and resolving technical issues in a software development team
Case study of streamlining inventory management in a retail store
Case study of improving customer service processes in a call center
- Q3. What is project management?
- Ans.
Project management is the process of planning, organizing, and overseeing the execution of a project from start to finish.
It involves defining project goals and objectives
Creating a project plan and timeline
Assigning tasks and responsibilities to team members
Monitoring progress and making adjustments as needed
Ensuring that the project is completed on time, within budget, and meets the desired quality standards
Examples ...
- Q4. What is financial and cost control during project management?
- Ans.
Financial and cost control is the process of monitoring and managing project expenses to ensure they stay within budget.
Developing a detailed budget plan
Tracking expenses and comparing them to the budget plan
Identifying and addressing cost overruns
Negotiating with vendors to get the best prices
Implementing cost-saving measures
Regularly reporting on financial status to stakeholders
- Q5. What is resource management?
- Ans.
Resource management is the process of planning, allocating, and optimizing resources to achieve organizational goals.
It involves identifying the resources needed for a project or task
Allocating those resources in an efficient manner
Monitoring and controlling resource usage to ensure optimal performance
Examples include managing personnel, finances, equipment, and time
Effective resource management can lead to increased p
- Q6. What is 2G , 3G, 4G call flow?
- Ans.
2G, 3G, and 4G call flow are the processes involved in establishing and maintaining a mobile phone call.
2G call flow involves circuit-switched technology and uses Time Division Multiple Access (TDMA) for voice transmission.
3G call flow uses packet-switched technology and supports both voice and data transmission.
4G call flow uses Long-Term Evolution (LTE) technology and provides high-speed data transmission.
All call fl...
- Q7. What is single RAN?
- Ans.
Single RAN is a network architecture that allows multiple wireless technologies to be supported on a single physical network.
Single RAN stands for Single Radio Access Network.
It enables multiple wireless technologies such as 2G, 3G, 4G, and 5G to be supported on a single physical network.
This reduces the need for multiple hardware and software components, resulting in cost savings and simplified network management.
Sing...
- Q8. What is VOLTE?
- Ans.
VOLTE stands for Voice over LTE. It is a technology that allows voice calls to be made over a 4G LTE network.
VOLTE uses IP packets to transmit voice calls over the LTE network
It provides better call quality and faster call setup times compared to traditional 2G/3G networks
VOLTE also allows for simultaneous voice and data usage on the same network
Examples of VOLTE-enabled devices include iPhone 6 and above, Samsung Gala...
- Q9. Difference between LTE & VOLTE?
- Ans.
LTE is a standard for wireless broadband communication while VoLTE is a technology that enables voice calls over LTE network.
LTE stands for Long-Term Evolution and is a standard for wireless broadband communication.
VoLTE stands for Voice over LTE and is a technology that enables voice calls over LTE network.
LTE is used for data transfer while VoLTE is used for voice calls.
VoLTE provides better call quality and faster c...
- Q10. What is transport network?
- Ans.
Transport network refers to the infrastructure that enables the movement of people, goods, and information.
Transport network includes roads, railways, airports, seaports, and communication networks.
It plays a crucial role in the economy by facilitating trade and commerce.
Examples of transport networks include the interstate highway system in the US and the European railway network.
Transport network planning involves op...
- Q11. Difference between ABIS over IP and ABIS over TDM?
- Ans.
ABIS over IP and ABIS over TDM are two different methods of transmitting biometric data.
ABIS over IP uses internet protocol to transmit biometric data while ABIS over TDM uses time-division multiplexing.
ABIS over IP is more flexible and scalable than ABIS over TDM.
ABIS over TDM is more reliable and secure than ABIS over IP.
ABIS over IP is suitable for remote locations while ABIS over TDM is suitable for local networks.
...
- Q12. Basic architecture of 2G , 3G & 4G?
- Ans.
2G, 3G, and 4G are mobile network technologies with different architectures.
2G uses circuit-switched technology and is primarily used for voice calls and text messaging.
3G uses packet-switched technology and offers faster data transfer rates than 2G.
4G uses all-IP packet-switched technology and provides even faster data transfer rates than 3G.
4G also supports advanced features like VoLTE and carrier aggregation.
Each ge...
- Q13. Introduce yourself?
- Ans.
I am a Senior engineer with 10+ years of experience in software development, specializing in backend systems and cloud technologies.
10+ years of experience in software development
Specialize in backend systems and cloud technologies
Strong problem-solving skills
Experience with large-scale distributed systems
Proficient in programming languages such as Java, Python, and Go
- Q14. What are the experiences of your previous companies?
- Ans.
I have worked in various companies ranging from startups to large corporations, gaining experience in diverse technologies and industries.
Worked in a startup where I was responsible for developing a scalable backend system using Node.js and MongoDB.
At a mid-sized company, I led a team in implementing CI/CD pipelines for faster and more reliable software delivery.
In a large corporation, I worked on optimizing performanc...
- Q15. Why do you want to join this company?
- Ans.
I am impressed by the company's innovative projects and strong reputation in the industry.
Company's reputation for cutting-edge technology
Opportunity to work on challenging projects
Positive reviews from current employees
- Q16. What is your notice period? Is it negotiable or not?
- Ans.
My notice period is currently 3 months, but it may be negotiable depending on the circumstances.
My current notice period is 3 months
I am open to negotiation depending on the circumstances
I can provide examples of when I have negotiated notice periods in the past
Interview Preparation Tips
Experience: Submitted resume online through portal and received the call. Technical Telephonic interview was scheduled.
Tips: Resume should be as per the desired profile.
Round: Technical Interview
Experience: In this round interviewer asks basic technical questions based on the previous experiences that was mentioned in my resume.
Tips: Study all the points mentioned in the resume very deeply.
Round: Technical Interview
Tips: Given your answers to the point. It should be in brief .
Round: HR Interview
Tips: Conversation should be in proper communication. Try to convince the HR for joining. Negotiate the salary as per the profile offered to you.
Skills: Technical Skill, Communication And Confidence, Team Working Ability
Skills evaluated in this interview
Interview Questionnaire
4 Questions
- Q1. Write a C code for printing Febonacci Series upto n elements
- Ans.
C code for printing Fibonacci Series upto n elements
Declare three variables to store the current, previous and next numbers in the series
Initialize the previous and current variables to 0 and 1 respectively
Use a loop to print the next number in the series by adding the previous two numbers
Loop should run n times to print n elements in the series
- Q2. Question related to family background
- Q3. What are your hobbies?
- Q4. What are your strengths and weaknesses?
Interview Preparation Tips
Experience: Questions were from easy to moderate level. No negative marking, so attempt all.
Tips: Keep your mind open and practice aptitude problems on a daily basis.
Round: Group Discussion
Experience: There were 21 students selected out of which two teams of 10 and 11 students were formed. Both the groups were given a topic and each one of us had to express our views.
Tips: Don't get nervous, just speak whatever you think. Don't yell or speak at loudly, just keep calm and put your points forward.
Duration: 20 minutes
Round: Technical Interview
Experience: Apart from the above questions some puzzles and DBMS questions and a few basic C questions were also asked. We were given enough time to think and answer.
Tips: Do not be in a hurry. Think properly what you are going to say, whether it is right or not and then only answer.
Round: HR Interview
Experience: The HR round was a good one. He tried to test my thinking capabilities and reasoning capabilities
Tips: Answer every question honestly.
General Tips: All the four rounds were elimination rounds and the final result was announced based on cumulative performance. So, be patient and give your best.
Skill Tips: Try to answer every properly
Skills: IQ, Basic Coding Skills, Problem Solving Skills
College Name: NIT ALLAHABAD
Motivation: The company visited our college campus. Also, one of my relatives in in Ericsson at a very high post and is quite happy working here.
Skills evaluated in this interview
I was interviewed in Mar 2017.
Interview Questionnaire
8 Questions
- Q1. Basics of networking
- Q2. Data structures
- Q3. Sql
- Q4. Introduction
- Q5. Final year project
- Q6. Why should I hire you?
- Ans.
I have the technical skills, experience, and passion to deliver high-quality software solutions.
I have a strong background in programming languages such as Java, Python, and C++.
I have experience working on complex software projects and collaborating with cross-functional teams.
I am passionate about staying up-to-date with the latest technologies and trends in software development.
I am a quick learner and have a strong...
- Q7. Why Ericsson?
- Ans.
Ericsson is a global leader in telecommunications technology with a strong focus on innovation and career development.
Global leader in telecommunications technology
Strong focus on innovation
Opportunities for career development
- Q8. About relocation
Interview Preparation Tips
Experience: The test which I wrote was based on cocubes. quants was easy, one can easily score 50 percent if they refer rs agarwal and logical was easy but it takes more time and verbal was neither easy nor tough. One thing I want to advice try doing verbal first so that u can save time and then go to quant and logical. After the test we got the results out of 160 students 51 cleared the test. I was one among them.
Duration: 45 minutes
Total Questions: 45
Round: Technical Interview
Experience: Keep ur cool in the technical. people are friendly. Think before you answer twice they may ask u puzzles as well. So be prepared for it. Final year project is a must, they are gonna ask u the details how you implement stuffs in your project. After my technical out of 51 students around 30 cleared this round. I was one among them.
Round: HR Interview
Experience: Don't be scared guys. Hr is just a casual one. finally around 15 were selected from my college including me. I am very happy with the result. best of luck guys. Do well!!!
Tips: Keep your cool. stay confident that's all I can tell. Once you clear technical one can easily clear Hr round.
Skills: Communication, Technical Skill
College Name: JSS Academy of Technical Education - JSSATE
I applied via Naukri.com and was interviewed before Jun 2020. There were 4 interview rounds.
Interview Questionnaire
1 Question
- Q1. Linux servers questions, past experience tools amd technologies
Interview Preparation Tips
Ayush Kalani
Interview Questionnaire
1 Question
- Q1. Solve a magic cube
Interview Preparation Tips
Experience: Aptitude test was taken on aspiring minds and name of the test series was AMCAT.600 students gave the exam and 90 were selected for the GD.
There were four sections and each section had a minimum number of questions to be attempted and there was no negative marking.Navigation among questions and sections were not allowed so use you time and mind carefully.
Section 1 - Quants
Section 2 - Verbal Ability and Critical Reasoning
Section 3 - Logical Reasoning
Section 4 - Programming and Computer Science
Tips: Speed is the key.key. Quants are easier they test only the speed of the candidate.I think the programming section has the max weight age so try to focus on that section and try to score maximum marks in that section. Programming questions were tough and there were questions from a wide range of subjects Networking , Algorithms ,Data Structures , Java, C/C++, Operating Systems,Advanced Databases etc.
Round: Group Discussion
Experience: Group discussion was very ordinary and easy to crack if you have the right content and suitable examples and clear and crisp communication skills.I took the against side of the issue which only 2 out of 10 members did and I was very bold and effective with my statements and defended my stance effectively.
Tips: Give examples,Be bold and clear and crisp .
Duration: 25 minutes
Round: HR Interview
Experience: My HR interview started at around 11pm in the night so it was very chilled out.He asked me about what excites me , why verizon , what projects I have done and what role I've played it them.He asked about my college life ? What do we study ? Why do you want to work for a MNC rather then a startup? and many more general questions which I don't remember because my interview was very chilled out. I was having fun.I asked him a lot of questions about job profile and company and many of their products so he was impressed with me.
Tips: Please do a detailed survey of the work that the company does and have knowledge about the sector and SDLC.
Round: Puzzle Interview
Experience: I was given a 3*3 and 5*5 magic cube to solve.I tried a lot of times and it took nearly 15-20 minutes to solve both the questions correctly.He asked my approach I said politely Hit and Trial and then he said to me there's a shortcut and he told me a very nice and quick trick to solve the magic cube.
Round: Technical Interview
Experience: Basic programming questions were asked about patterns, strings and some algorithms like quick sort and merge sort.
Major tough and difficult questions were asked on databases and advanced databases in oracle.He asked many questions about the projects that I've done.In depth questions regarding projects were asked.He asked questions about various things used in web application and may question regarding MySql and Tables and JOINS.
Tips: Keep your calm even if you don't know any answer. I couldn't answer to one question of databases which carried our discussion on that questions for around 10 mins but still I couldn't answer the question and in the end I asked just out of curiosity that I want to know the answer to the question and he explained me the concept perfectly.
Skills: Programming, Databases, Communication Skills, Software Development Life Cycle
College Name: SRM University
Interview Questionnaire
6 Questions
- Q1. Suppose you are recruited as an ECE engineer in IRCTC. Your job is to stop the train accidents that happen every now and then. Use your Applied Electronics to construct a scheme/plan. Tell me how will you ...
- Ans.
Using Applied Electronics to prevent train accidents in IRCTC
Implement sensors to detect obstacles on tracks
Use GPS and communication systems to alert train drivers of potential dangers
Install automatic braking systems in case of emergency
Regular maintenance and inspection of tracks and trains
Train and educate staff on safety protocols and emergency procedures
- Q2. Explain the working of IC 555 timer
- Ans.
IC 555 timer is a versatile timer IC used in various applications like oscillators, timers, and flip-flops.
IC 555 timer has three modes of operation: monostable, astable, and bistable.
In monostable mode, the output is high for a fixed duration when triggered.
In astable mode, the output oscillates between high and low states.
In bistable mode, the output remains in either high or low state until triggered.
IC 555 timer ca...
- Q3. How internet works, Network model etc
- Ans.
The internet is a global network of interconnected devices that communicate using standardized protocols.
The internet is based on the TCP/IP protocol suite.
Data is transmitted in packets across the network.
The network model consists of layers, including the physical, data link, network, transport, and application layers.
Routing protocols are used to direct packets to their destination.
Examples of internet applications ...
- Q4. General question from my CV
- Q5. Tell me about yourself
- Ans.
I am a software engineer with experience in developing web and mobile applications using various programming languages and frameworks.
Proficient in Java, Python, and JavaScript
Experience with React, Angular, and Node.js
Strong understanding of database management systems
Passionate about learning new technologies and solving complex problems
- Q6. Family, Schooling, Interests
Interview Preparation Tips
Experience: It was 2.5 hour long AMCAT test comprising of Quant, Verbal ability, analytic ability, technical section comprising questions from C, DSA and other computer fundamentals.
The test is not that difficult so the cutoff generally goes high
Duration: 150 minutes
Round: Technical Interview
Experience: Started with a formal "Tell me about yourself". While I continued for 2 minutes, he read my CV word to word. Since I had always been interested in programming and so it was my strong point. But he didn't even ask my area of interest and directly asked me question from core electronics that too application based. The questions were like this:
1. "Suppose you are recruited as an ECE engineer in IRCTC. Your job is to stop the train accidents that happen every now and then. Use your Applied Electronics to construct a scheme/plan. Tell me how will you proceed?"
I was literally stunned at such a question. However I took some seconds to think and gave him 2-3 answers all applying the idea in one way or the other. Like use of modern sensors, RADAR technology, Use of automated baricates at crossings and explained it to him. He wasn't fully convinced but somehow I was able to do OK.
After that i told him that I was more comfortable in programming and computer science subjects. he neglected this altogether and kept asking me ECE questions. Next questions were like "Explain the working of IC 555 timer." I told him straight away that I didn't know it very well.
After this he moved on to ask me the difference between GSM and CDMA technology, how mobile phones work and the whole concept of cellular telephony. I had prepared well for it and told him even more than he was expecting so he was quite pleased to hear it.
Next were some questions from computer networks like how internet works, Network model etc. I told him I was studying CN currently so i gave him the basics of OSI model explaining briefly each of the 7 layers. Also told him about sub-nets, sub-net masks etc.
After this he asked me some general question from my CV about my achievements like KVPY scholarship, NTSE scholarship and about my research paper. I explained it to him to the best I could. Then I asked a couple questions from my side and this interview was over. The whole process took around 35-40 minutes.
Tips: For technical, have a solid command over all the fundamentals of important subjects. You need to start early. 3rd year is a good time to plan and start your preparation. In your summer holidays before 7th semester, don't focus your full attention on your training. It is also important but you need to take out some extra time for aptitude building, revising concepts and enhancing your communication skills. Be confident and be honest. Try to make the conversation as interesting as possible. Try to be more interested in the company. If possible, do a little homework about the company visiting your college. It will prove to be useful and certainly will give you an edge above others.
Round: HR Interview
Experience: It had hardly been 15 minutes after the completion of my technical interview and I was called for the HR round. Again it started with “tell me about yourself” but this time the lady asked me everything about my family, my schooling, my interests and all. It was a really good 30 minutes spent as the conversation was really interesting. Then she asked me whether I had any problems in relocation. Then it led to a good discussion about how is life different in Hyderabad and Chennai. I asked her a little bit about her education and how she started a formal career in management. She was very happy to respond. Lastly, there were some concluding remarks, a formal thank you and the interview was over.
Tips: Make the interview as interactive as possible. Ask a lot of questions. The person should know that you are really interested in the company. Prepare good answers for HR round well in advance.Any extracurricular activities that you have been a part of may come up in the HR/Managerial round. I was asked what have you done in your college life so far other than studies. I had a lot to say in that matter as i was involved in dramatics, debating, quizzing and other activities right from the school level. They may be interested to know how efficiently have you handled any complex or challenging situations in your life. I was the Event Executive of Fashion Show "PANACHE" in BLITZSCHLAG'13. I explained to HR what all I did to make that event a success and she was really impressed with it.
General Tips: CGPA matters. Not always but definitely it's a point worth considering when the interviewers are confused even after the completion of all the rounds about which students to select.Although not specific to this company, but other companies give a lot of credit to CGPA. It is an important factor along with the 1st written round for the shortlisting of candidates.So, maintain as good a CGPA as you can.In your technical interview you are going to be asked about at least one project that you have been involved in your college life. If some project is mentioned in your CV, it is certain that the interviewer will ask you about it. I have seen discussions as long as 1 hour or more on one's project itself.
College Name: NIT JAIPUR
Skills evaluated in this interview
I applied via Company Website and was interviewed before Feb 2021. There were 2 interview rounds.
Aptitude text
Interview Preparation Tips
- Networking
I was interviewed in Jan 2017.
Interview Questionnaire
1 Question
- Q1. No. of output pins of microprocessor 8085
- Ans.
The microprocessor 8085 has a total of 40 output pins.
The microprocessor 8085 is an 8-bit microprocessor.
It has a total of 40 pins, which are used for various purposes.
These pins include address bus pins, data bus pins, control pins, and power supply pins.
Some of the output pins are used for sending signals to external devices or peripherals.
Examples of output pins in the microprocessor 8085 include the RD (Read) pin a
Interview Preparation Tips
Experience: Resume was shortlisted.
Tips: Involve in cocurricular activities.
Round: Technical Interview
Experience: Resume was shortlisted.
Tips: Involve in cocurricular activities.
Skills: Technical Skills
Skills evaluated in this interview
I applied via Referral and was interviewed before May 2020. There were 5 interview rounds.
Interview Questionnaire
1 Question
- Q1. More on oops and design patterns
Interview Preparation Tips
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