ECOSYS Interview Questions and Answers

20 - MCQ test related C&C++ basic to advance
2 - coding questions -
1) create class which allows only one instance creation at a time if you try to create another before deleting existing object then class should throw exception..

2) find the distance between leftmost string and rightmost string(string's chars order doesn't matter) In a given long shuffled string.
Ex :-
Shuffled string = "xaxxcxbxxxcxxaxxbx"
target string= "abc"
Ans: 3
(Leftmost string is last index 6
Right most is 9 so 9-6=3)
Note:- other chars not necessarily 'x' it can be any

Q1. Explain oops concepts
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Q2. Runtime polymorphism with example
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Q3. Vtable and Vptr working
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Q4. Abstraction and pure virtual function
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Q5. Smart pointers
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Q6. Implementation of STL libraries any container class ex:- Vector
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Q7. Singleton class creation (code) what is use of it ?
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Q8. SQL simple questions
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Q9. What is the use of Mutex
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Q10. Be strong in theoretically (why, what when to use the concept)
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Q1. What special attributes do you possess that make you a perfect fit for this role, considering that many individuals can perform car service?
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Q2. What skills do you possess that are relevant to the execution of this role?
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Q3. What attracted you to choose this company as your new employer?
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Q4. What's your salary expectations
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Q1. Do you have experience
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Q2. Are you dedicated to this role
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Integrity and honesty

Q1. What improvements to interfaces were introduced in Java 8 that were missing in Java 7, specifically regarding static and default methods?
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Q2. Explain internal working of HashMap ? How to synchronize it ?
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Q3. Given a list of employees with their ratings, how can you sort the employees based on their ratings using the Java 8 Streaming API?
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Q4. Will the program compile if the parent class throws a runtime exception while the child class throws an arithmetic exception?
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Q5. In a Spring Boot application with two databases, how can you configure JDBC to specify which database to use?
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Q6. How to use a jetty server in your spring boot application ?
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Q7. Difference between @RequestParam and @PathVariable ?
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Q8. How would you handle a scenario where one microservice is awaiting a response from another microservice that is taking an extended time to respond?
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Q1. How should one conduct an interview session?
Ans. 
Conducting an interview session involves preparation, active listening, asking relevant questions, and providing a positive experience for the candidate.
• Prepare by reviewing the candidate's resume and job description

• Create a comfortable environment for the candidate to feel at ease

• Ask open-ended questions to encourage detailed responses

• Listen actively and take notes to remember key points

• Provide clear information about...read more
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Q2. What strategies can I employ to secure a job quickly?
Ans. 
Utilize networking, tailor your resume, apply to multiple positions, and follow up with potential employers.
• Network with professionals in your desired field to learn about job opportunities.

• Customize your resume and cover letter for each job application to highlight relevant skills and experiences.

• Apply to a variety of positions to increase your chances of securing a job quickly.

• Follow up with potential employers after...read more
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How should I complete my assignments?

How can I effectively complete my tasks?

What training is available to help me perform my job?

Q1. How can I effectively complete my job profile?
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Q2. How should I approach interacting with my interviewer?
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Q1. How can I prepare for my job role?
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Q2. Please any employeer can help to control my training
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Process planning refers to the methodical approach of determining the best possible way to manufacture a product or deliver a service by considering various aspects such as resources, timelines, and methodologies involved in production or execution.

Q1. Explain about previous process
Ans. 
Implemented a new chemical process to increase efficiency and reduce waste.
• Researched and analyzed current process to identify areas for improvement

• Designed and tested new process using simulation software

• Collaborated with production team to implement changes and monitor results

• Achieved 20% increase in production output and 15% reduction in waste

• Continuously monitored and optimized process for further improvements
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Q2. Explain about my work experience
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Q3. Explain about my work standard
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Q4. Explain about my managing method
Ans. 
I utilize a combination of project management tools and communication strategies to effectively manage my team and projects.
• I prioritize tasks based on deadlines and importance

• I regularly communicate with team members to ensure everyone is on the same page

• I use project management software such as Trello or Asana to track progress and assign tasks

• I adapt my management style to fit the needs and preferences of individual
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Q5. Explain about my working style
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The Aptitude Test session accesses mathematical and logical reasoning abilities

Q1. What is Vlookup
Ans. 
Vlookup is a function in Excel used to search for a value in a table and return a corresponding value from another column.
• Vlookup stands for 'Vertical Lookup'

• It is commonly used in Excel to search for a value in the leftmost column of a table and return a value in the same row from a specified column

• Syntax: =VLOOKUP(lookup_value, table_array, col_index_num, [range_lookup])

• Example: =VLOOKUP(A2, B2:D10, 3, FALSE) - searc...read more
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Q2. Some IF else Question in Excel
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Q3. What does your day in your previous organization look like?
Ans. 
My day in my previous organization involved analyzing large datasets, creating reports, and presenting findings to stakeholders.
• Reviewing and cleaning large datasets to ensure accuracy

• Creating visualizations and reports to communicate insights

• Collaborating with team members to identify trends and patterns

• Presenting findings to stakeholders in meetings or presentations
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Q4. Could you share the technical skills you possess?
Ans. 
I possess strong technical skills in data analysis, including proficiency in programming languages, statistical analysis, and data visualization tools.
• Proficient in programming languages such as Python, R, SQL

• Skilled in statistical analysis and data modeling techniques

• Experience with data visualization tools like Tableau, Power BI

• Knowledge of machine learning algorithms and techniques
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Q5. Can you explain what a Pivot Table is?
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A Pivot Table is a data summarization tool used in spreadsheet programs to analyze, summarize, and present data in a tabular format.
• Pivot tables allow users to reorganize and summarize selected columns and rows of data to obtain desired insights.

• Users can easily group and filter data, perform calculations, and create visualizations using pivot tables.

• Pivot tables are commonly used in Excel and other spreadsheet program...read more
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Q6. Find the Highest-paid employee in each department along with their salary and department name.
Ans. 
To find the highest-paid employee in each department, we need to group employees by department and then select the employee with the highest salary in each group.
• Group employees by department

• Find the employee with the highest salary in each group

• Retrieve the employee's name, salary, and department name
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It's walkin, so they conducted 1 technical mcqs round.

Q1. Multi threading
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Q2. Internal working of hashmap
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HashMap in Java is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values based on keys.
• HashMap uses an array of buckets to store key-value pairs.

• Keys are hashed to determine the index in the array where the key-value pair will be stored.

• In case of hash collisions, a linked list or a balanced tree is used to store multiple key-value pairs in the same bucket.

• HashMap allows null keys...read more
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Q3. Spring batch related
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Q4. Non repeating characters in a array
Ans. 
Function to find and return all non-repeating characters in an array of strings.
• Iterate through the array and count the occurrences of each character using a HashMap.

• Then iterate through the array again and check if the count of each character is 1, if so add it to the result list.

• Return the list of non-repeating characters.
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Q5. 3rd highest salary
Ans. 
To find the 3rd highest salary in a database, we can use a SQL query with the 'LIMIT' and 'OFFSET' keywords.
• Use a SQL query with 'ORDER BY salary DESC' to sort the salaries in descending order.

• Use 'LIMIT 1 OFFSET 2' to skip the first two highest salaries and retrieve the third highest salary.

• Example: SELECT salary FROM employees ORDER BY salary DESC LIMIT 1 OFFSET 2;
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Q6. Qualifier vs primary
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A qualifier in Java is used to specify additional information about a primary, which is the main data type or variable.
• A primary in Java is the main data type or variable, while a qualifier provides additional information about the primary.

• Qualifiers can be used to modify the behavior or characteristics of a primary.

• For example, in Java, 'final' is a qualifier that can be used to make a variable constant.
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Q7. Controller vs restcontroller
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The main difference is that @RestController is a specialized version of @Controller that is used for RESTful web services.
• Both @Controller and @RestController are used in Spring MVC to handle HTTP requests, but @RestController is specifically used for RESTful web services.

• @Controller is used to create web pages, while @RestController is used to return data in JSON or XML format.

• @RestController is a convenience annotati...read more
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Q8. Spring boot annotataions
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Q9. Oops concepts with examples
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OOP concepts include inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class. Example: class Dog extends Animal.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: private variables with public getter and setter methods.

• Polymorphism: Ability for objects to be treated as instances of their paren...read more
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Q10. Spring batch configuration
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Q11. They covered all java, spring and Microservices
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Q1. Microservices architecture
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Q2. How do Microservices communicate
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Microservices communicate with each other through various communication protocols like HTTP, messaging queues, and gRPC.
• Microservices can communicate over HTTP using RESTful APIs.

• Messaging queues like RabbitMQ or Kafka can be used for asynchronous communication between microservices.

• gRPC is a high-performance, open-source RPC framework that can be used for communication between microservices.

• Service discovery mechanism...read more
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Q3. How to access the Microservice end point
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Microservice endpoints can be accessed using HTTP requests with the appropriate URL
• Use HTTP methods like GET, POST, PUT, DELETE to interact with the microservice

• Construct the URL with the base URL of the microservice and the specific endpoint path

• Include any necessary headers or parameters in the request for authentication or data filtering
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Q4. Why we use microservices
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Microservices allow for modular, scalable, and flexible software development by breaking down applications into smaller, independent services.
• Microservices enable easier maintenance and updates as each service can be developed, deployed, and scaled independently.

• They improve fault isolation, as failures in one service do not necessarily affect the entire application.

• Microservices promote agility and faster time-to-mark...read more
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Q1. What is the impact of purchase of inventory on financial statements
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Q2. Accounting concepts
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Q3. What do u know about USGAAP
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Q4. Since I mentioned in my resume that i have mutual funds and derivatives knowledge he asked me about these topics a bit
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Q1. What do you know about optum
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Q2. How well do you know the excel
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Q3. You may have to learn various softwares, are you fine with it
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Topics - mcq of algorithms, networking, dbms

Q1. Based on resume
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Q2. Questions on linked list, tree,
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Q1. About how you approach a problem
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Q2. Managerial questions on situations
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Q1. Basic hr questions
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