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STMicroelectronics Developer Interview Questions and Answers

Updated 16 May 2017

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I was interviewed in Sep 2017.

Interview Questionnaire 

3 Questions

  • Q1. A C program was asked to write
  • Q2. How to implement sr flipflop using gates.
  • Ans. 

    An SR flip-flop can be implemented using NAND gates.

    • Use two NAND gates to create the SR flip-flop.

    • Connect the output of one NAND gate to the input of the other NAND gate.

    • Connect the Set (S) and Reset (R) inputs to the inputs of the NAND gates.

    • The output of the first NAND gate is the Q output, and the output of the second NAND gate is the Q̅ output.

  • Answered by AI
  • Q3. Steps to find temperature of N rooms and display the same
  • Ans. 

    The answer describes the steps to find and display the temperature of N rooms.

    • Create an array to store the temperature of each room

    • Iterate through each room and prompt the user to enter the temperature

    • Store the temperature in the corresponding array index

    • Display the temperature of each room

  • Answered by AI

Interview Preparation Tips

Round: Resume Shortlist
Experience: The first criteria for shortlisting is based on CGPA (8 above)

Round: Test
Experience: A technical test was conducted which had questions from C language and Microcontroller. It was MCQ type.The test was moderately hard
Duration: 30 minutes
Total Questions: 30

Round: Technical Interview
Experience: The above questions were asked and a paper was provided to answer it. The next shotlist was based on the paper evaluation
Tips: Technical knowledge mandatory

Skills: Technical
College Name: Government Model Engineering College, Thrikkakara

Skills evaluated in this interview

I was interviewed before May 2016.

Interview Preparation Tips

Round: written test
Experience: it was elitmus test conducted by the company itself on campus. As per my knowledge only those scoring 90 percentile got selected for round 2.
Tips: Attempt only those ques that are necessary for scoring 90+ in e litmus. Specially in verbal don't attempt more then required questions, though you might be tempted. The aim is not to score max bt to score 90+

Round: Technical Interview
Experience: This was a programming based round. I was asked to write algorithms for various array linked list based problems. There was cross questioning prompting to reduce complexity and to use different data structures for same problems.

Mostly it focused on subjects like c, data structures and ADA.
Tips: Be clear with basic of data structures and algorithms. Pointers, queue, stacks, array linked lists, sorting etc are the keywords.

Round: Technical Interview
Experience: This was a information security specific round since that was my major. In depth cross questioning on my thesis topics, honeypots, network intrusion etc. Security certificates, and on the go problems to provide security solution layer wise in different scenarios. Security concept of torrents was also asked in detail.
Tips: It was more of a security discussion and throwing of ideas about how things in a particular case could work or could not. Don't worry about right or wrong answer just be clear with your reasoning about the solution you are suggesting.

Round: Other Interview
Experience: I don't know what to name this round, but it focused mainly on developing test cases for an object. Say they gave me a stapler and said to develop a test plan listing down test cases for a given object to pass so that it can be confirmed that it is a stapler. Another scenario was with a lift.
Tips: This is one round where your presence of mind and inter personal skills matter. I think the way you present your thoughts was most important here.

Round: Behavioural Interview
Experience: This was was mostly about how would you react in a given professional situation
Like your assigned work could not be completed on time, or if you are doing something wrong with the work assigned.
Tips: This is all about inter personal skills and putting your best foot forward :)

College Name: Indira Gandhi Delhi Technical University For Women, Delhi

I was interviewed in Sep 2016.

Interview Preparation Tips

Round: Test
Experience: Questions aren't tough but they take more time to read itself.
Tips: First try to attempt the questions which are seemingly small. Reading bigger questions first and wasting more time on that isnt a good idea at all.
Duration: 30 minutes
Total Questions: 30

Skills: Technical Skill, Analytical Skills
College Name: IIT Kharagpur

I applied via Campus Placement

Interview Questionnaire 

4 Questions

  • Q1. What is a program, task and threads
  • Ans. 

    A program is a set of instructions that tells a computer what to do. A task is a unit of work performed by a program. A thread is a sequence of instructions within a task.

    • A program is a collection of instructions that are executed by a computer to perform a specific task.

    • A task is a unit of work that is performed by a program. It can be a specific action or a set of actions.

    • A thread is a sequence of instructions within...

  • Answered by AI
  • Q2. Delete a node in a linked list
  • Ans. 

    To delete a node in a linked list, we need to adjust the pointers of the previous and next nodes.

    • Find the node to be deleted by traversing the linked list

    • Adjust the pointers of the previous and next nodes to skip the node to be deleted

    • Free the memory occupied by the node to be deleted

  • Answered by AI
  • Q3. What is a function pointer and volatile type in c
  • Ans. 

    A function pointer is a variable that stores the address of a function. Volatile type is used to declare variables that can be modified by external factors.

    • Function pointers are used to pass functions as arguments to other functions.

    • Volatile type is used when a variable's value can be changed unexpectedly by external factors.

    • Function pointers can be used to implement callbacks or event handling mechanisms.

    • Volatile type...

  • Answered by AI
  • Q4. Summarise your resume
  • Ans. 

    Experienced software developer with expertise in Java, Python, and SQL

    • Proficient in Java, Python, and SQL programming languages

    • Developed web applications using Java Spring framework

    • Experience with database management and optimization using SQL

    • Worked on various software projects in a team environment

  • Answered by AI

Interview Preparation Tips

Round: Test
Experience: Paper was challenging and It was well set.

Duration: 90 minutes
Total Questions: 60

Round: Technical Interview
Experience: It was a very good experience overall. Interviewer helped to ease the tension.
Tips: Waiting time can be reduced.

General Tips: Prepare for precedence of operators in C.
Try to be fast in solving the problems.
Skills: Knowledge Of Your Resume Points, Pointers In C, Operating System Basics
Duration: 2
College Name: IIT Madras
Motivation: Qualcomm is a

Skills evaluated in this interview

Interview Questionnaire 

5 Questions

  • Q1. In C programming they asked about storage classes, Volatile , Whole compilation process steps by steps, Dangling pointer , Memory leak, Memory corruption
  • Q2. In data structure they asked question on String , Linked List and array
  • Q3. Data structure question section is easy don't go for complex algorithms just study basic algorithms. like reverse the linked list in group on given size
  • Q4. They also asked question on bit manipulation. Like Check that given number binary representation is palindrome or not?
  • Q5. Swap even and odd bits in given number
  • Ans. 

    Swap even and odd bits in a given number

    • Create a mask for even bits and odd bits

    • Shift even bits to right and odd bits to left

    • Combine even and odd bits using bitwise OR operator

  • Answered by AI

Interview Preparation Tips

College Name: NA

Skills evaluated in this interview

Interview experience
3
Average
Difficulty level
Moderate
Process Duration
Less than 2 weeks
Result
No response

I applied via Campus Placement and was interviewed in Feb 2024. There were 2 interview rounds.

Round 1 - Aptitude Test 

Logical questions were asked in round one

Round 2 - Technical 

(1 Question)

  • Q1. All core sub based questions were asked

Interview Preparation Tips

Interview preparation tips for other job seekers - be confident
Interview experience
5
Excellent
Difficulty level
-
Process Duration
-
Result
-
Round 1 - Coding Test 

Linkedlist questions

Round 2 - One-on-one 

(2 Questions)

  • Q1. Depth Os and C
  • Q2. Multi threading and semaphores

I was interviewed before Oct 2020.

Round 1 - Coding Test 

(2 Questions)

Round duration - 60 minutes
Round difficulty - Medium

This round had 2 coding problems and we had to code it on hackerearth only.
The use of Outside IDE was forbidden.
The timing of test was 12:00 PM to 1:00 PM.

  • Q1. 

    Merge Overlapping Intervals Problem Statement

    Given a specified number of intervals, where each interval is represented by two integers denoting its boundaries, the task is to merge all overlapping interv...

  • Ans. 

    Merge overlapping intervals and return sorted list of merged intervals.

    • Iterate through intervals and merge overlapping ones

    • Sort merged intervals based on starting times

    • Handle edge cases like empty input or single interval

    • Use a data structure like list or array to store merged intervals

  • Answered by AI
  • Q2. 

    Search In Rotated Sorted Array Problem Statement

    Given a rotated sorted array ARR of size 'N' and an integer 'K', determine the index at which 'K' is present in the array.

    Note:
    1. If 'K' is not present...
  • Ans. 

    Given a rotated sorted array, find the index of a given integer 'K'.

    • Use binary search to find the pivot point where the array is rotated.

    • Based on the pivot point, perform binary search on the appropriate half of the array to find 'K'.

    • Handle cases where 'K' is not present in the array by returning -1.

  • Answered by AI
Round 2 - Face to Face 

(2 Questions)

Round duration - 60 minutes
Round difficulty - Medium

This was an Online F2F Technical Round conducted on CodePair : Hackerearth. So, Basically You have to Run and Submit ( Pass All Test cases) in the Interview Round also (Like normal Coding Test) in Hackerearth & along with that You should have to explain your Code and Approach to the Interviewers.
The Interviewers were helpful and didn't hesitate in giving hints.
Timing - 11:00 A.M to 12:00 P.M

  • Q1. 

    Minimum Fountains Activation Problem

    In this problem, you have a one-dimensional garden of length 'N'. Each position from 0 to 'N' has a fountain that can provide water to the garden up to a certain range...

  • Ans. 

    Find the minimum number of fountains to activate to water the entire garden.

    • Iterate through the array to find the coverage of each fountain.

    • Keep track of the farthest coverage reached by activating fountains.

    • Activate the fountain that covers the farthest point not yet covered.

    • Repeat until the entire garden is watered.

  • Answered by AI
  • Q2. 

    Bellman Ford Shortest Path Problem

    Given a directed weighted graph comprised of vertices labeled 1 to N and M edges, where each edge connects two nodes u and v with a weight w representing the distance be...

  • Ans. 

    Bellman Ford algorithm is used to find the shortest path in a graph with negative weights.

    • Initialize distances from source to all vertices as infinity, and distance to source as 0.

    • Relax all edges V-1 times to find shortest path.

    • If any distance is updated in Vth iteration, then there is a negative weight cycle.

    • Return the distance to destination vertex after V-1 iterations.

    • Example: For the given graph, shortest path from

  • Answered by AI
Round 3 - HR 

Round duration - 30 minutes
Round difficulty - Easy

This was a Google Meet Video Call. The HR was friendly and asked basic questions.
The timing was 2:00 PM to 2:30 PM.

Interview Preparation Tips

Professional and academic backgroundI applied for the job as SDE - 1 in DelhiEligibility criteriaNo backlogs in MastersQualcomm interview preparation:Topics to prepare for the interview - Dynamic Programming, OOPS, Computer Networks, Computer System Architecture, Operating System, Data Structures, PointersTime required to prepare for the interview - 4 monthsInterview preparation tips for other job seekers

Tip 1 : Make sure that you are thorough with CS concepts beforehand.
Tip 2 : Even when you are explaining the approach to a question, try to parallelly think about how you would code it.
Tip 3 : Read the previous interview experiences. It would give a fair idea of the kind of questions one should expect.
Tip 4 : Practice atleast 200 questions from coding platforms like CodeZen, LeetCode, Interviewbit as they contain common interview questions.

Application resume tips for other job seekers

Tip 1 : Mention atleast 1 project and past work experience as it sets good impression.
Tip 2 : Keep your resume up to date for the role you are applying.
Tip 3 : Try to keep your resume of 1 Page.

Final outcome of the interviewSelected

Skills evaluated in this interview

I applied via Referral and was interviewed in Jun 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 

(3 Questions)

  • Q1. Binary tree(convert BT to min heap), dbms, networking questions, what happens when you type google.com in browser.
  • Q2. Swap 2 nos without using 3rd variable
  • Ans. 

    Swapping 2 numbers without using a third variable

    • Use arithmetic operations to swap the values

    • Addition and subtraction can be used to swap the values

    • XOR operation can also be used to swap the values

  • Answered by AI
  • Q3. Prison break question, can be found in leetcode discussion section

Interview Preparation Tips

Interview preparation tips for other job seekers - prepare well, i am just typing to cross fifty character limit

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