Bank of America Software Development Engineer 1 Interview Questions and Answers

Round duration - 150 minutes
Round difficulty - Medium

For MCQ Round, we have 2 rounds:- 
1. Logical Reasoning (Window of 4 hours)
2. Mathematical Reasoning(Window of 4 hours)
The environment was fine. They gave an option of attempting a mock test in order to familiarize us with the environment

Logical Reasoning, in which there were 12 questions, and for each question we had a time limit of 75 seconds. There was a cut-off of 40 for the next round, and people who qualified were sent an e-mail with a link to continue with the process.

Numerical Reasoning, in my opinion, was the most challenging round. The questions were in a pair of 3 in which a table/bank statement was given and 3 questions were based on that. The questions were purely based on calculations and semi-subjective. The time given for the 1st question was 90 seconds and for the rest 2 questions, 75 seconds each

For Coding Round, 
120 minutes window(Test was of 90 minutes)
We have two questions
For the first question(30 Minutes)
For the second question(60 Minutes)
The tricky thing was we only had one attempt, i.e we were allowed to submit the solution only once.

Q1. 
Maximum Frequency Number Problem Statement
Given an array of integers with numbers in random order, write a program to find and return the number which appears the most frequently in the array.
If multip...read more
Ans. 
Find the number with the highest frequency in an array, returning the first one in case of ties.
• Count Frequencies: Use a hash map to count occurrences of each number in the array.

• Track First Occurrence: Store the index of the first occurrence of each number to resolve ties.

• Iterate Efficiently: Loop through the array once to build the frequency map and another pass to determine the maximum frequency.

• Example: For input [...read more
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Q2. 
Mike and Mobile Problem Statement
Mike, a little boy who loves solving math problems, was playing with his mom's mobile phone. The mobile keypad includes 12 buttons: 10 digit buttons (0-9) and 2 non-digit...read more
Ans. 
Mike can generate unique numbers by pressing mobile keypad buttons, following specific rules for adjacent presses.
• Button Press Rules: Mike can press the same button or an adjacent one after the initial press.

• Initial Choices: For N=1, he can choose any of the 10 digits (0-9), resulting in 10 unique numbers.

• Adjacent Button Logic: For N=2, starting from any digit, he can press the same or adjacent digits, leading to 36 co...read more
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Round duration - 40 minutes
Round difficulty - Medium

The timing was around 1 pm and the whole interview went for about 40 minutes.
The interviewer first went through my resume and asked me to introduce myself. After my introduction, he asked me about my projects mentioned in the resume. In the introduction itself, I told him that I am interested in competitive programming and preparing for ICPC. He then asked me about my preparation for ICPC. He then asked me some questions from OOPS. I was then asked 1 simple CP problem. The interviewer also asked about situation-based problems. As I previously mentioned about Competitive Programming, he asked how this will help in adding value to the company.

Q1. 
Remove Duplicates Problem Statement
You are given an array of integers. The task is to remove all duplicate elements and return the array while maintaining the order in which the elements were provided.
...read more
Ans. 
The task is to remove duplicates from an array while preserving the original order of elements.
• Use a set to track seen elements and a list to store the result, ensuring duplicates are skipped.

• Example: For input [1, 2, 2, 3, 1], the output should be [1, 2, 3].

• Iterate through the array, adding elements to the result list only if they haven't been seen before.

• This approach maintains the order of first occurrences of each ...read more
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Round duration - 10 minutes
Round difficulty - Easy

In this round interviewer basically asked about my project in detail and also asked about various technologies used in that project.

Round duration - 10 minutes
Round difficulty - Easy

We were asked about family background, location of the intern, any interest in startups (as they don’t want students who they hire also work with startups side by side), etc.

Q1. What is HTML?
Ans. 
HTML stands for Hyper Text Markup Language. HTML is the standard markup language for creating Web pages. HTML describes the structure of a Web page. HTML consists of a series of elements. HTML elements tell the browser how to display the content.
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Q2. What is CSS?
Ans. 
Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in HTML or XML (including XML dialects such as SVG, MathML or XHTML). CSS describes how elements should be rendered on screen, on paper, in speech, or on other media.
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Q3. What is MySQL?
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Q4. What is Java?
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Q5. What is the full form of PHP?
Ans. 
The full form of PHP is Hypertext Preprocessor. It was abbreviated previously as Personal Home Page. It is a programming language widely used to build web applications or websites.
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Round duration - 90 minutes
Round difficulty - Medium

The coding round consisted of 3 coding questions. 1st question was of 20 marks, 2nd and 3rd of 50 marks.

Q1. 
Minimum Number of Operations Problem Statement
Given an array 'ARR' consisting of 'N' positive integers, determine the minimum number of operations needed to make all elements of the array equal. You may ...read more
Ans. 
Determine minimum operations to make all array elements equal using addition, subtraction, multiplication, or division.
• Iterate through array to find the minimum and maximum values

• Calculate the difference between the maximum and minimum values

• Return the difference as the minimum number of operations needed
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Q2. 
Avoiding Traps Problem Statement
Given an array of obstacles' coordinates, determine the minimal jump length to reach beyond all obstacles starting from coordinate 0 while avoiding landing on any obstacle...read more
Ans. 
Find the minimal jump length to bypass all obstacles while avoiding landing on any obstacle.
• Iterate through the obstacle coordinates to find the maximum coordinate.

• Calculate the minimum jump length needed to bypass all obstacles.

• Ensure the jump length consistently avoids all obstacle points.

• The final jump can overshoot the line's end point.
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Q3. 
Longest Consecutive Sequence Problem Statement
You are given an unsorted array/list ‘ARR’ of ‘N’ integers. Your task is to return the length of the longest consecutive sequence.
The consecutive sequence ...read more
Ans. 
Find the length of the longest consecutive sequence in an unsorted array of integers.
• Sort the array to make it easier to identify consecutive sequences.

• Use a set to store unique elements and check for consecutive numbers.

• Track the length of consecutive sequences and update the maximum length found.

• Handle duplicates by counting only one occurrence in the consecutive sequence.
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Round duration - 45 minutes
Round difficulty - Easy

Timing: 10:15 - 11:00 am.
The interview was online from home.

Round duration - 45 minutes
Round difficulty - Medium

Timing: 2:15 - 3:00 PM
The interview was online from home.
There were a few audio cuts in the video call but we were able to manage regardless.

Q1. 
Reverse a String Problem Statement
Given a string STR containing characters from [a-z], [A-Z], [0-9], and special characters, determine the reverse of the string.
Input:
The input starts with a single i...read more
Ans. 
Reverse a given string containing characters from [a-z], [A-Z], [0-9], and special characters.
• Iterate through the characters of the string in reverse order and append them to a new string.

• Use built-in functions like reverse() or StringBuilder in languages like Python or Java for efficient reversal.

• Handle special characters and numbers along with alphabets while reversing the string.

• Ensure to print each reversed string ...read more
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Q1. DSA questions and questions based on your skills
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Q2. What questions were asked regarding your resume during the interview?
Ans. 
The interviewer asked about my projects, skills, and experiences listed on my resume to gauge my fit for the role.
• Discussed my previous role at XYZ Corp, focusing on a project where I improved system performance by 30%.

• Inquired about my proficiency in Java and how I applied it in developing a web application.

• Asked about my experience with Agile methodologies and how I contributed to sprint planning.

• Explored my involvem...read more
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Q1. Tell me about yourself
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Basic code to be written

Q1. System design , HLD, LLD , coding question
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1)Buy and sell stock
2)2 sum
3) system design
4) Elastic search
5) deployment