3i Infotech Senior .NET Developer Interview Questions, Process, and Tips

Q1. Given an array of non-negative integers.Find the length of the longest subsequence such that elements in the subsequence are contiguous integers. The consecutive numbers can be in any order. Example n=7 nu...read more
Ans. 
Find the length of the longest subsequence of contiguous integers in an array.
• Sort the array

• Iterate through the array and check for consecutive integers

• Keep track of the longest subsequence found
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Q2. Get list of pincodes from these objects Employee{ id Long, name String, Addresses : List
} Addresses{ houseNo long, pindcode long, state String, country String, } Ans. Use flatMap to flatten and then use m...read more
Ans. 
Use flatMap and map to extract list of pincodes from Employee objects
• Use flatMap to flatten the list of Addresses in each Employee object

• Use map to iterate over the flattened list and extract the pincodes

• Example: employeeList.stream().flatMap(emp -> emp.getAddresses().stream()).map(address -> address.getPincode()).collect(Collectors.toList())
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Q3. What is Database Pooling, Hikari and its configurations. Java 8 to current enchancements and current java version Factory and Builder design patterns to explain and code Project expalantion and details, Cr...read more
Ans. 
Database pooling is a technique used to manage a pool of database connections for efficient resource utilization. HikariCP is a popular database connection pooling library in Java.
• HikariCP is a high-performance database connection pooling library for Java applications.

• It is known for its low latency and high throughput.

• Configurations for HikariCP include settings such as maximum pool size, connection timeout, and idle ...read more
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2 leetcode medium level type problems were given. This was a cut-off test were majority will be cut-off.

Long coding round - Paired with another thoughtworker

Q1. Questions on project
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Q2. Frameworks related
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Q1. Explain Sonarqube, different type of code smells, and how its implemented in CI CD
Ans. 
Sonarqube is a static code analysis tool used to detect code smells and bugs in code. It is integrated into CI/CD pipelines for continuous code quality checks.
• Sonarqube is a static code analysis tool that identifies code smells, bugs, and security vulnerabilities in code.

• Code smells are common programming issues that may indicate a deeper problem in the code. Examples include duplicated code, long methods, and complex ...read more
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Q2. Write a program to find the numbers divisble by 3 in a string - and reverse its indexes eg : - input : String s = "123456789" output String s = "129456783"
Ans. 
Program to find numbers divisible by 3 in a string and reverse their indexes.
• Iterate through the string and check if each character is a number divisible by 3.

• Store the divisible numbers in an array and reverse their indexes.

• Join the array back into a string and return the result.
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Q1. Questions on spring boot and question around spring annotations and its benifits
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Q2. Questions on Java 8 - 21 versions such as virtual threads and stream API
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Q3. Question on Databases fundamentals.
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Q1. Java basics java advanced
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Q2. Springboot questions
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