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30+ Innovaccer Interview Questions and Answers

Updated 19 Feb 2025

Q1. Implementation of HashMap with Constant Time Operations

Design a data structure that effectively stores a key-value mapping and performs specific operations in constant time.

Explanation:

Your data structure sh...read more

Ans.

Design a data structure implementing HashMap with constant time operations like INSERT, DELETE, SEARCH, GET, GET_SIZE, IS_EMPTY.

  • Use a combination of hash table and linked list to achieve constant time operations.

  • For INSERT and UPDATE, hash the key to get the index and store the (key, value) pair in the linked list at that index.

  • For DELETE, SEARCH, and GET, hash the key to find the index, then traverse the linked list at that index to perform the operation.

  • Maintain a counter f...read more

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Q2. Rate yourself in SQL and PowerBi

Ans.

I rate myself highly in SQL and PowerBi, with extensive experience in both tools.

  • Proficient in writing complex SQL queries for data extraction, manipulation, and analysis

  • Skilled in creating interactive and insightful visualizations in PowerBi

  • Experience in combining data from multiple sources and transforming it into actionable insights

  • Familiar with optimizing queries for performance and efficiency

  • Have successfully used PowerBi to present data-driven recommendations to stakeho...read more

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Innovaccer Interview Questions and Answers for Freshers
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Q3. Isomorphic Trees Problem Statement

You are provided with two arbitrary binary trees. Determine if both trees are isomorphic.

Explanation:

Two binary trees are considered isomorphic if one tree can be transforme...read more

Ans.

Determine if two binary trees are isomorphic by swapping left and right subtrees.

  • Check if both trees are empty, return 'yes' if they are

  • Perform the swap operation on any node at any level

  • Compare the structures of both trees after swapping to determine isomorphism

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Q4. Explanation of different data structures

Ans.

Data structures are ways to organize and store data in a computer system.

  • Data structures include arrays, linked lists, stacks, queues, trees, graphs, etc.

  • Arrays store elements of the same data type in contiguous memory locations.

  • Linked lists consist of nodes where each node contains data and a reference to the next node.

  • Stacks follow the Last In First Out (LIFO) principle.

  • Queues follow the First In First Out (FIFO) principle.

  • Trees have a hierarchical structure with a root nod...read more

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Q5. Explain types of joins.

Ans.

Types of joins are inner join, left join, right join, and full outer join.

  • Inner join: Returns only the rows that have matching values in both tables.

  • Left join: Returns all the rows from the left table and the matched rows from the right table.

  • Right join: Returns all the rows from the right table and the matched rows from the left table.

  • Full outer join: Returns all the rows when there is a match in either left or right table.

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Q6. Different Type of Joins

Ans.

Different types of joins in SQL are inner join, left join, right join, and full outer join.

  • Inner join: Returns rows when there is a match in both tables.

  • Left join: Returns all rows from the left table and the matched rows from the right table.

  • Right join: Returns all rows from the right table and the matched rows from the left table.

  • Full outer join: Returns rows when there is a match in either table.

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Q7. Different types of join

Ans.

Different types of join include inner join, outer join, left join, and right join.

  • Inner join: Returns only the rows that have matching values in both tables.

  • Outer join: Returns all rows when there is a match in one of the tables.

  • Left join: Returns all rows from the left table and the matched rows from the right table.

  • Right join: Returns all rows from the right table and the matched rows from the left table.

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Q8. What is closure? Application and concept understanding

Ans.

Closure is a function that captures the environment in which it was created, allowing it to access variables from that environment even after the function has finished executing.

  • Closure allows a function to access variables from its outer scope even after the function has finished executing.

  • It 'closes over' the variables from the outer scope, preserving their values.

  • Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(...read more

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Q9. What sort of data types can be used as keys in Python?

Ans.

Data types that can be used as keys in Python include strings, integers, floats, tuples, and custom objects.

  • Strings are commonly used as keys in Python dictionaries.

  • Integers and floats can also be used as keys.

  • Tuples can be used as keys if they only contain immutable elements.

  • Custom objects can be used as keys if they are hashable.

  • Examples: {'name': 'John'}, {1: 'apple'}, {(1, 2): 'tuple'}

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Q10. - What impact would introduction of self-driving cars will have?

Ans.

Self-driving cars will revolutionize transportation, reduce accidents, increase efficiency, and change the way we live.

  • Self-driving cars will reduce accidents caused by human error

  • They will increase efficiency by reducing traffic congestion and optimizing routes

  • They will change the way we live by providing more free time during commutes

  • Self-driving cars will also impact industries such as insurance, transportation, and logistics

  • They will also have implications for urban plann...read more

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Q11. What are ways to speed up SQL queries? List them in increasing order of complexity?

Ans.

Ways to speed up SQL queries in increasing order of complexity

  • Use indexes on columns frequently used in WHERE clauses

  • Optimize queries by avoiding unnecessary joins and subqueries

  • Use stored procedures to reduce network traffic and improve performance

  • Consider denormalizing tables for frequently accessed data

  • Use query optimization techniques like query caching and query hints

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Q12. What is the SQL query used to remove duplicates from a dataset?

Ans.

Use the DISTINCT keyword in a SELECT query to remove duplicates from a dataset.

  • Use the SELECT DISTINCT statement to retrieve unique rows from a table

  • Example: SELECT DISTINCT column1, column2 FROM table_name;

  • Another way is to use the GROUP BY clause with aggregate functions like COUNT() or SUM() to remove duplicates

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Q13. What is the SQL query to find the third highest salary in a table?

Ans.

Use a subquery to find the third highest salary in a table using SQL.

  • Use the ORDER BY clause to sort the salaries in descending order.

  • Use the LIMIT clause to limit the results to the third row.

  • Use a subquery to select the third highest salary from the sorted list.

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Q14. How many automated tools have been worked till date

Ans.

I have worked with 5 automated tools till date.

  • I have experience working with Selenium for web automation

  • I have used Appium for mobile automation

  • I have worked with JMeter for performance testing

  • I have experience with Jenkins for continuous integration

  • I have used Postman for API testing

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Q15. How many email campaigns you run on a daily basis

Ans.

I do not run email campaigns on a daily basis as my role does not involve marketing activities.

  • My role as a Senior Technical Associate does not involve running email campaigns

  • My focus is on technical tasks such as software development and troubleshooting

  • If there are any email campaigns that need technical support, I may assist in that aspect

  • However, I do not have any direct involvement in the planning or execution of email campaigns

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Q16. Outcomes achieved, marketing mix for events, how events are managed from india?

Ans.

Events in India are managed by focusing on specific outcomes, utilizing a strategic marketing mix, and ensuring effective execution.

  • Outcomes achieved through events are measured against predefined goals and objectives.

  • Marketing mix for events includes a combination of online and offline channels, social media promotion, partnerships with influencers, and targeted advertising.

  • Events in India are managed by a dedicated team that coordinates logistics, vendor relationships, atte...read more

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Q17. Is Redis single-threaded or multi-threaded?

Ans.

Redis is single-threaded.

  • Redis is single-threaded, meaning it can only execute one command at a time.

  • This design choice allows Redis to be extremely fast and efficient for certain use cases.

  • However, it also means that Redis may not be the best choice for highly concurrent workloads.

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Q18. What types of indexing exist in SQL?

Ans.

Types of indexing in SQL include clustered, non-clustered, unique, and composite indexes.

  • Clustered index physically reorders the table based on the index key

  • Non-clustered index creates a separate structure for the index

  • Unique index ensures that all values in the index column are unique

  • Composite index uses multiple columns for indexing

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Q19. What is event loop?

Ans.

Event loop is a mechanism that allows for asynchronous programming by handling and executing events in a loop.

  • Event loop is a part of the runtime environment that listens for events and executes callback functions.

  • It allows for non-blocking I/O operations by delegating tasks to the operating system.

  • Event loop is commonly used in JavaScript for handling asynchronous operations like setTimeout, setInterval, and AJAX requests.

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Q20. Find avg salary of employees for each department & order employee within a department by age.

Ans.

Calculate average salary of employees for each department and order employees within a department by age.

  • Group employees by department and calculate average salary for each group

  • Sort employees within each department by age

  • Display the results

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Q21. SQL qeus to find 5th max salary of an employee from employee_table.

Ans.

Use SQL query to find 5th max salary from employee_table.

  • Use ORDER BY clause to sort salaries in descending order.

  • Use LIMIT 1 OFFSET 4 to get the 5th highest salary.

  • Example: SELECT salary FROM employee_table ORDER BY salary DESC LIMIT 1 OFFSET 4;

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Q22. Why healthcare sector and why Innovaccer ?

Ans.

I am passionate about using data to improve healthcare outcomes, and Innovaccer's innovative solutions align with my goals.

  • Passionate about using data to improve healthcare outcomes

  • Believe in the potential of technology to transform the healthcare sector

  • Innovaccer's innovative solutions and cutting-edge technology attracted me

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Q23. overfit and how to fix that

Ans.

Overfitting occurs when a model learns the noise in the training data rather than the underlying pattern.

  • Regularization techniques like L1 and L2 regularization can help prevent overfitting by penalizing large coefficients.

  • Cross-validation can be used to evaluate the model's performance on unseen data and prevent overfitting.

  • Feature selection or dimensionality reduction techniques can help reduce overfitting by focusing on the most important features.

  • Collecting more data or u...read more

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Q24. Solids conceps of oops , recurssion problem

Ans.

Solid understanding of OOP concepts and recursion problem-solving skills are essential for a Senior SDET Software Engineer role.

  • OOP concepts include encapsulation, inheritance, polymorphism, and abstraction.

  • Recursion is a technique where a function calls itself to solve a problem.

  • Understanding how to break down a problem into smaller subproblems and solve them recursively is key.

  • Examples of recursion problems include factorial calculation, Fibonacci sequence, and tree travers...read more

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Q25. Any interesting problem solved ?

Ans.

Developed a predictive model to forecast customer churn for a telecom company.

  • Identified key factors contributing to customer churn such as call drop rates and customer service response times.

  • Collected and cleaned data from various sources including customer call logs and service records.

  • Used machine learning algorithms such as logistic regression and random forest to build the predictive model.

  • Achieved a prediction accuracy of 85% and provided actionable insights to reduce c...read more

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Q26. Why Innovaccer?

Ans.

Innovaccer is a leading healthcare technology company that is transforming the way care is delivered and managed.

  • Innovaccer's platform enables healthcare organizations to improve patient outcomes and reduce costs through data-driven insights and automation.

  • The company has a strong track record of success, with a growing customer base and partnerships with major healthcare providers.

  • Innovaccer is committed to innovation and staying ahead of the curve in the rapidly evolving he...read more

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Q27. LOCATE X PATH , GET WINDOW HANDLE

Ans.

Locate element using Xpath and retrieve window handle in automation testing.

  • Use findElement method with By.xpath to locate the element using Xpath.

  • Use getWindowHandle method to retrieve the window handle.

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Q28. TYPES OF WAITS WITH THEIR SYNTAX

Ans.

Types of waits in automation testing with their syntax

  • Implicit Wait: driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);

  • Explicit Wait: WebDriverWait wait = new WebDriverWait(driver, 10); wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("elementID")));

  • Fluent Wait: Wait wait = new FluentWait(driver).withTimeout(Duration.ofSeconds(10)).pollingEvery(Duration.ofSeconds(2)).ignoring(NoSuchElementException.class);

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Q29. How's Budgeting is done

Ans.

Budgeting is done by creating a financial plan to allocate resources for specific purposes.

  • Identify financial goals and priorities

  • Estimate income and expenses

  • Allocate funds accordingly

  • Monitor and adjust budget as needed

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Q30. Perform task on joins?

Ans.

Joins are used to combine rows from two or more tables based on a related column between them.

  • Use JOIN keyword to combine tables based on a common column

  • Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

  • Example: SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.id

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Q31. Different between SLA & OLA

Ans.

SLA is an agreement between a service provider and a customer, while OLA is an agreement between different teams within the same organization.

  • SLA (Service Level Agreement) is an agreement between a service provider and a customer, outlining the level of service that is expected.

  • OLA (Operational Level Agreement) is an agreement between different teams within the same organization, defining the responsibilities and expectations for inter-team support.

  • SLA focuses on the service ...read more

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Q32. Views AND Triggers in SQL

Ans.

Views and triggers are SQL database objects used for data manipulation and automation.

  • Views are virtual tables that display data from one or more tables based on a query.

  • Triggers are special stored procedures that are automatically executed in response to certain events on a table.

  • Views can simplify complex queries by predefining joins and filters.

  • Triggers can enforce data integrity rules or automate tasks like auditing changes.

  • Example: Creating a view to display a list of cu...read more

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Q33. Design a data pipeline

Ans.

Design a data pipeline for processing and analyzing large volumes of data efficiently.

  • Identify data sources and types of data to be processed

  • Choose appropriate tools and technologies for data ingestion, processing, and storage

  • Design data processing workflows and pipelines to transform and analyze data

  • Implement data quality checks and monitoring mechanisms

  • Optimize data pipeline for performance and scalability

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Q34. Design Splitwise equivalent

Ans.

Design a Splitwise equivalent for splitting expenses among friends

  • Allow users to create groups and add friends to the group

  • Users can add expenses and specify who paid and who owes how much

  • Keep track of balances and settle debts among friends

  • Implement features like recurring expenses, notifications, and expense categorization

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Q35. Waits in selenium

Ans.

Waits in Selenium are used to make tests more reliable by waiting for certain conditions to be met before proceeding.

  • Waits help handle synchronization issues in test automation

  • Types of waits in Selenium include Implicit Wait, Explicit Wait, and Fluent Wait

  • Example: WebDriverWait wait = new WebDriverWait(driver, 10); wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("elementId")));

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Q36. Explain projects

Ans.

Projects are specific tasks or assignments that require a set of skills and resources to complete.

  • Projects are temporary endeavors with a defined beginning and end.

  • They are unique, with specific goals, deliverables, and constraints.

  • Projects require a team of individuals with different roles and responsibilities.

  • Examples: Developing a data pipeline for real-time analytics, building a recommendation system for an e-commerce platform.

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