DXC Technology Senior Application Developer Interview Questions and Answers

Q1. Bascis of Angular - Routing, version upgrade, DI ,AOT JIT , FORMS , Services , Observable, Promise , lifecyclle
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Q1. What is COND parameter
Ans. 
COND parameter is used in JCL to specify a condition for executing a job step.
• COND parameter is used in IF/THEN/ELSE statements to determine the execution of a job step.

• It can be used to check the return code of a previous step or a specific condition.

• COND parameter can have values like ONLY, EVEN, ONLY EVEN, etc.

• It can also be used with the NOT operator to negate the condition.

• COND parameter can be used with job steps
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Q2. Used in JCL to skip few steps
Ans. 
COND parameter is used in JCL to skip few steps
• COND parameter is used in JCL to specify a condition that must be met before executing a step

• If the condition is not met, the step is skipped

• The syntax for using COND parameter is: COND=(code,operator,stepname)

• For example, COND=(0,NE,STEP1) will skip the step if the return code of the previous step is not 0
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Q1. What is DISTINCT in DB2
Ans. 
DISTINCT is a keyword in DB2 used to retrieve unique values from a column or set of columns.
• DISTINCT is used in SELECT statements to eliminate duplicate rows.

• It can be used with one or more columns.

• It is often used in conjunction with aggregate functions like COUNT, SUM, AVG, etc.

• Example: SELECT DISTINCT column1, column2 FROM table_name;

• Example: SELECT COUNT(DISTINCT column_name) FROM table_name;
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Q2. Used to remove duplicates
Ans. 
The function used to remove duplicates is called 'distinct'.
• Distinct is used in SQL to remove duplicate rows from a result set.

• In Python, the set() function can be used to remove duplicates from a list.

• The unique() function in R can be used to remove duplicates from a vector.
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Advanced java, springboot, Hibernate questions

Q1. System design, springboot- microservices, advanced java questions, pseudo code programming question(basic)
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Hacker rank test was given, we need to clear that first.

Q1. Java8 features, collections, Security management in application
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Q2. Microservices, Spring boot concepts
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Q1. Current project discussion and joining date confirmation
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Q1. Swap the value of two variables without using the third variable
Ans. 
To swap the value of two variables without using a third variable, use arithmetic operations.
• Use addition and subtraction to swap values

• Example: a = 5, b = 10. a = a + b (a = 15), b = a - b (b = 5), a = a - b (a = 10)
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Q2. Basic javascript - Promises, Callbacks, difference in event handling in javascript & react.js
Ans. Synthetic events are present in React, syntax differences
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Q3. What is Context API
Ans. 
Context API is a feature in React that allows sharing data between components without having to pass props through every level of the component tree.
• Context API provides a way to pass data through the component tree without having to pass props down manually at every level.

• It is particularly useful for passing down global data like themes, user authentication, or language preferences.

• Context API consists of three main ...read more
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Q4. How do you orient some components in react with 40 or more pages? whats your approach?
Ans. 
Use a routing library like React Router to manage navigation and organize components into separate pages.
• Utilize React Router to set up routes for each page and handle navigation

• Organize components into separate folders based on their functionality or page they belong to

• Consider lazy loading components to improve performance, especially with a large number of pages
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Q5. How would you optimize an application?
Ans. 
Optimizing an application involves identifying and resolving performance bottlenecks to improve efficiency and user experience.
• Identify and address slow database queries or inefficient code

• Implement caching mechanisms to reduce load times

• Optimize images and assets to reduce file sizes

• Utilize asynchronous processing to improve responsiveness

• Profile and analyze code to identify areas for improvement
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Simple Hackerround test involving 50 MCQ's.

Q1. Focused on JAVA and spring boot framework questions. was asked one 1 DS problem on stack.
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Q2. Check balance paranthesis
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Q1. This round was focused on project discussion , where initially I was asked lot of questions on my tech stack and how do you work and deliver a software release to production. Then the manager took over an...read more
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I was asked about ReactJS and Node JS questions and 3 coding questions

Q1. Basic dax and questions on visualisations in power BI
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Q2. Basic SQL questions on joins and window functions.
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