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leidos Interview Questions and Answers
Updated 21 Feb 2026Data Scientist Interview Experience
Candidate: Anna M.
Experience Level: Entry-level
Applied Via: Campus recruitment
Difficulty:
Final Result:
Interview Process
3 rounds
Questions Asked
- Explain the bias-variance tradeoff.
- How do you handle missing data in a dataset?
- Describe a machine learning project you worked on.
- Write a SQL query to find the top 5 customers by revenue.
- Behavioral: Describe a time you had to learn a new tool quickly.
Advice
Strengthen your coding skills and be ready to explain your projects in depth.
Full Experience
I was recruited through a campus event. The first round was a coding and statistics test. The second round was a technical interview with data science problems and SQL questions. I was not invited to the final round but received helpful feedback on improving my technical depth.
Project Manager Interview Experience
Candidate: David K.
Experience Level: Mid-level
Applied Via: LinkedIn application
Difficulty:
Final Result:
Interview Process
2 rounds
Questions Asked
- How do you manage project scope changes?
- Describe your experience with Agile methodologies.
- Tell me about a project that failed and what you learned.
- How do you handle stakeholder communication?
- Behavioral: Give an example of leading a cross-functional team.
Advice
Focus on clear examples of project successes and challenges, and demonstrate strong communication skills.
Full Experience
After applying on LinkedIn, I had a phone interview and then an in-person panel interview. The panel included senior managers who asked situational and behavioral questions. The interviewers valued my practical experience and communication style.
Cybersecurity Analyst Interview Experience
Candidate: Sophia L.
Experience Level: Senior
Applied Via: Recruiter outreach
Difficulty: Hard
Final Result:
Interview Process
3 rounds
Questions Asked
- How do you handle a zero-day vulnerability?
- Explain the difference between symmetric and asymmetric encryption.
- Describe your experience with SIEM tools.
- Walk me through a recent security incident you managed.
- Behavioral: How do you stay updated with cybersecurity trends?
Advice
Prepare detailed examples of past incident responses and stay current with security tools.
Full Experience
The recruiter contacted me directly. The first round was a phone interview focusing on technical knowledge. The second was a practical assessment involving incident response scenarios. The final round was with the hiring manager discussing team fit and leadership. The process was rigorous but fair.
Systems Engineer Interview Experience
Candidate: Michael T.
Experience Level: Entry-level
Applied Via: Referral
Difficulty:
Final Result:
Interview Process
4 rounds
Questions Asked
- Explain the OSI model layers.
- How do you troubleshoot network latency issues?
- Describe a time you automated a manual process.
- What experience do you have with cloud platforms?
- Behavioral: Describe a conflict you had with a team member and how you resolved it.
Advice
Gain more hands-on experience with network troubleshooting and cloud technologies.
Full Experience
I was referred by a friend and went through four rounds: phone screen, technical deep dive, hands-on problem-solving, and behavioral interview. The technical rounds were intense, focusing on networking concepts and practical scenarios. Although I didn't get the offer, the feedback was constructive.
Software Engineer Interview Experience
Candidate: Emily R.
Experience Level: Mid-level
Applied Via: Online application via company website
Difficulty:
Final Result:
Interview Process
3 rounds
Questions Asked
- Explain the difference between multithreading and multiprocessing.
- Describe a challenging bug you fixed in a previous project.
- Write a function to reverse a linked list.
- How do you ensure code quality in your projects?
- Behavioral: Tell me about a time you worked in a team under pressure.
Advice
Brush up on data structures and algorithms, and be ready to discuss past projects in detail.
Full Experience
The process started with an online coding test focusing on algorithms and data structures. The first technical interview was with an engineer who asked about my previous experience and coding questions. The second round was more system design focused. The final round was behavioral and cultural fit. Overall, the interviewers were friendly and the process was well-structured.
Frequently Asked Questions in leidos
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Common Interview Questions in leidos
Q: A rich merchant had collected many gold coins. He did not want anybody to know about them. One day his wife asked, "How many gold coins do we have?" After pausing a moment, he replied, "Well! If I divide the coins into two unequal numbers, then 32 times the difference between the two numbers equals the difference between the squares of the two numbers."The wife looked puzzled. Can you help the merchant's wife by finding out how many gold coins they have?
Q: Suppose a newly-born pair of rabbits, one male, one female, are put in a field. Rabbits are able to mate at the age of one month so that at the end of its second month a female can produce another pair of rabbits. Suppose that our rabbits never die and that the female always produces one new pair (one male, one female) every month from the second month on.
Q: A rich man died. In his will, he has divided his gold coins among his 5 sons, 5 daughters and a manager. According to his will: First give one coin to manager. 1/5th of the remaining to the elder son.Now give one coin to the manager and 1/5th of the remaining to second son and so on..... After giving coins to 5th son, divided the remaining coins among five daughters equally.All should get full coins. Find the minimum number of coins he has?
Q: There are two balls touching each other circumferencically. The radius of the big ball is 4 times the diameter of the small all. The outer small ball rotates in anticlockwise direction circumferencically over the bigger one at the rate of 16 rev/sec. The bigger wheel also rotates anticlockwise at N rev/sec. What is 'N' for the horizontal line from the centre of small wheel always is horizontal.
Q: There are 3 clans in an island - The Arcs who never lie, the Dons who always lie and the Slons who lie alternately with the truth. Once a tourist meets 2 guides who stress that the other is a Slon. They proceed on a tour and see a sports meet. The first guide says that the prizes have been won in the order Don, Arc, Slon. The other says that, the order is Slon, Don, Arc. (the order need not be exact). To which clan did each of the guides and the players belong? ...
Q: The citizens of planet nigiet are 8 fingered and have thus developed their decimal system in base 8. A certain street in nigiet contains 1000 (in base 8) buildings numbered 1 to 1000. How many 3s are used in numbering these buildings?
Q: ABCDE are sisters. Each of them gives 4 gifts and each receives 4 gifts No two sisters give the same combination ( e.g. if A gives 4 gifts to B then no other sisters can give four to other one.)Â (i) B gives four to A.(ii) C gives 3 to E. How much did A,B,C,E give to D?
Q: There is a room with a door (closed) and three light bulbs. Outside the room there are three switches, connected to the bulbs. You may manipulate the switches as you wish, but once you open the door you can't change them. Identify each switch with its bulb.
Q: Every day a cyclist meets a train at a particular crossing .The road is straight before the crossing and both are travelling in the same direction.Cyclist travels with a speed of 10 kmph.One day the cyclist come late by 25 minutes and meets the train 5 km before the crossing.What is the speed of the train?
Q: Jarius and Kylar are playing the game. If Jarius wins, then he wins twice as many games as Kylar. If Jarius loses, then Kylar wins as the same number of games that Jarius wins. How many do Jarius and Kylar play before this match?
Q: In a Park, N persons stand on the circumference of a circle at distinct points. Each possible pair of persons, not standing next to each other, sings a two-minute song ? one pair immediately after the other. If the total time taken for singing is 28 minutes, what is N?
Q: There are four dogs/ants/people at four corners of a square of unit distance. At the same instant all of them start running with unit speed towards the person on their clockwise direction and will always run towards that target. How long does it take for them to meet and where?
Q: In a country where everyone wants a boy, each family continues having babies till they have a boy. After some time, what is the proportion of boys to girls in the country? (Assuming probability of having a boy or a girl is the same)
Q: A family X went for a vacation. Unfortunately it rained for 13 days when they were there. But whenever it rained in the mornings, they had clear afternoons and vice versa. In all they enjoyed 11 mornings and 12 afternoons. How many days did they stay there totally?
Q: A person meets a train at a railway station coming daily at a particular time. One day he is late by 25 minutes, and he meets the train 5 k.m. before the station. If his speed is 12 kmph, what is the speed of the train.
Q: There are some chickens in a poultry. They are fed with corn. One sack of corn will come for 9 days. The farmer decides to sell some chickens and wanted to hold 12 chicken with him. He cuts the feed by 10% and sack of corn comes for 30...
Q: Motorboat A leaves shore P as B leaves Q; they move across the lake at a constant speed. They meet first time 600 yards from P. Each returns from the opposite shore without halting, and they meet 200 yards from. How long is the lake?
Q: In mathematics country 1,2,3,4....,8,9 are nine cities. Cities which form a no. that is divisible by 3 are connected by air planes. (e.g. cities 1 & 2 form no. 12 which divisible by 3 then 1 is connected to city 2). Find the total no. of ways you can go to 8 if you are allowed to break the journeys.
Q: Four persons have to cross the bridge they are having one torch light. Four persons take 1,2,5,10 minutes respectively, when two persons are going they will take the time of the slowest person. What is the time taken to cross by all of them.
Q: The profit made by a company in one year is enough to give 6% return on all shares. But as the preferred shares get on return of 7.5%, so the ordinary shares got on return of 5%. If the value of preferred shares is Rs 4,000000, then what is the va...
