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Performance Engineer Interview Questions


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Cognizant Technology Solutions
Performance Test Engineer was asked...11 April 2015

what are the different stages in performance testing

6 Answers

Requirements, planning, design, development, testing,implementation, maintenance, Less


Performance Testing Stages: 1) Identifying the testing environment. 2) Identifying the performance metrics: Performance metrics is very important which determines the parameters on which test has to be performed. 3) Planning and designing the test. 4) Test environment setup. 5) Capturing the data. 6) Analysis and report generation. 7) Retesting: The test is again performed on the same parameters to test if the rectification work is sufficient or needs some tuning. Less

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Why might you use SMTP to get large (multi-gig) line-oriented text-based logs from one machine to another?

4 Answers

SMTP does auto-retry. Also, I believe the fact that logs are text means that SMTP servers are particularly tailored to them. Less

How about that SMTP will convert the line breaks for the target OS?

Found excellent read:

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Tell me about yourself

3 Answers

disclose background




sql query to find count of students having same last name

3 Answers

select count(LastName) from employees group by LastName having count(*)>1

Select lastname, count(*) as lastnamecount from students group by lastname having count(*)>1 Less

select * from Students where lastName in (select s1.lastName from Students s1 group by s1.lastName having count(*)>1); Less

Expedia Group

List the functional test cases for this theoretical application.

2 Answers

Listed a few, but not in my area of expertise.

Interviewed 6 FAANG employees and got this:


What is Hits per Second, Throughput, Pacing, Think Time.

2 Answers

Hits per seconds:- refer to the number of HTTP requests sent by the users to the web servers in a seconds. Throughput:- define the number of transaction per seconds. Think Time:- it's a waiting time between transaction, or users waiting time. Less

Number of Http request sent to the server in a sec


Phases in PTLC

2 Answers

1.Identify the non functional requiements 2. Performance Test planning 3. Test Design 4. Test Execution 5. Reporting and Analysis 6. Recommendation to solution Less

7 Phases involved in PT 1. Identify Test Envn 2. Determine Performance Criteria 3. Plan & Design Test 4. Configure Test Envn 5. Implement Test Design 6. Run Test 7. Analyse Test Results Less


Relatively simple scripting exercise using codesignal where knowledge of binary search is necessary to solve the question efficiently. It didn't seem particularly relevant to the job. I guess it's more about how you approach the given problem? So they want to know if you avoid slower solutions and at least know and are confident implementing binary search?!

2 Answers

I also had basically the same experience with you, I think the company is good, but the recruiter is performing unprofessional. Less

Through questions like this, interviewers are mostly trying to test your skillset (and its relevance to the role) as robustly as possible, so be prepared for multiple offshoots and followups. It could be a useful exercise to do mocks with friends or colleagues in Cohesity to get a real sense of what the interview is actually like. Alternatively Prepfully has a ton of Cohesity Performance Engineer experts who provide mock interviews for a pretty reasonable amount. Less


Find the Kth largest element in a list

2 Answers

Min heap or a modified quick sort

Priority queue

Accion Labs

Q: PHP, MYSQL, OOPs, Server Infrastructure, AWS services, Performance improvements, Security, Server and Application Logs questions asked.

2 Answers

A: With my inhand experience with all these scenarios I was able to answer it asexpected from Interview panel. Less

After how many days they give interview feedback

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