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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: In a sports contest there were m medals awarded on n successive days (n > 1). 1. On the first day 1 medal and 1/7 of the remaining m - 1 medals were awarded. 2. On the second day 2 medals and 1/7 of the now remaining medals was awarded; and so on.On the nth and last day, the remaining n medals were awarded.How many days did the contest last, and how many medals were awarded altogether?
Q: 9 cards are there. You have to arrange them in a 3*3 matrix. Cards are of 4 colors. They are red, yellow, blue and green. Conditions for arrangement: one red card must be in first row or second row. 2 green cards should be in 3rd column. Yellow cards must be in the 3 corners only. Two blue cards must be in the 2nd row. At least one green card in each row.
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: Consider a pile of Diamonds on a table. A thief enters and steals 1/2 of the total quantity and then again 2 extra from the remaining. After some time a second thief enters and steals 1/2 of the remaining+2. Then 3rd thief enters and steals 1/2 of the remaining+2. Then 4th thief enters and steals 1/2 of the remaining+2. When the 5th one enters he finds 1 diamond on the table. Find out the total no. of diamonds originally on the table before the 1st thief entered.
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: 36 people {a1, a2, ..., a36} meet and shake hands in a circular fashion. In other words, there are totally 36 handshakes involving the pairs, {a1, a2}, {a2, a3}, ..., {a35, a36}, {a36, a1}. Then size of the smallest set of people such that the res...
Q: T, U, V are 3 friends digging groups in fields. If T & U can complete i groove in 4 days &, U & V can complete 1 groove in 3 days & V & T can complete in 2 days. Find how many days each takes to complete 1 groove individually.
Q: There are 3 sticks placed at right angles to each other and a sphere is placed between the sticks . Now another sphere is placed in the gap between the sticks and Larger sphere . Find the radius of smaller sphere in terms of radius of larger sphere.
Q: The egg vendor calls on his first customer and sells half his eggs and half an egg. To the second customer, he sells half of what he had left and half an egg and to the third customer he sells half of what he had then left and half an egg. By the way he did not break any eggs. In the end three eggs were remaining . How many total eggs he was having ?
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: A vessel is full of liquid. From the vessel, 1/3rd of the liquid evaporates on the first day. On the second day 3/4th of the remaining liquid evaporates. What fraction of the volume is present at the end of the second day
Q: There are 7 letters A,B,C,D,E,F,GAll are assigned some numbers from 1,2 to 7.B is in the middle if arranged as per the numbers.A is greater than G same as F is less than C.G comes earlier than E.Which is the fourth letter
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: Give two dice - one is a standard dice, the other is blank (nothing painted on any of the faces). The problem is to paint the blank dice in such a manner so that when you roll both of them together, the sum of both the faces should lie between 1 and 12. Numbers from 1-12 (both inclusive) equally likely.
Q: Given a collection of points P in the plane , a 1-set is a point in P that can be separated from the rest by a line, .i.e the point lies on one side of the line while the others lie on the other side. The number of 1-sets of P is denoted by n1(P)....
Q: Consider a series in which 8 teams are participating. each team plays twice with all other teams. 4 of them will go to the semi final. How many matches should a team win, so that it will ensure that it will go to semi finals.?
Q: Jack and his wife went to a party where four other married couples were present. Every person shook hands with everyone he or she was not acquainted with. When the handshaking was over, Jack asked everyone, including his own wife, how many hands they shook?
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: An escalator is descending at constant speed. A walks down and takes 50 steps to reach the bottom. B runs down and takes 90 steps in the same time as A takes 10 steps. How many steps are visible when the escalator is not operating.Â
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?