30+ Innovaccer Interview Questions and Answers

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

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

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

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

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.

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.

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.

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

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'}

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

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

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

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.

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

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

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

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.

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

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.

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

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;

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

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

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

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

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

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.

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);

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

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

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

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

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

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

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")));