10+ Stacil Engineering Interview Questions and Answers

Cloud offers more flexibility, scalability, and cost-effectiveness compared to other virtualization platforms.

• Cloud allows for on-demand resource allocation and de-allocation, making it more flexible than traditional virtualization platforms.

• Cloud can scale up or down quickly to meet changing demands, whereas traditional virtualization platforms require manual intervention.

• Cloud offers a pay-as-you-go model, allowing for cost savings compared to traditional virtualization pla...read more

L3 activities refer to advanced technical support and troubleshooting.

• L3 activities involve resolving complex technical issues that cannot be handled by L1 or L2 support.

• L3 support may involve analyzing logs, debugging code, and providing solutions to critical problems.

• L3 support may also involve working closely with developers to identify and fix bugs in software.

• Examples of L3 activities include resolving network outages, diagnosing server issues, and troubleshooting softwa...read more

var, let, and const are different ways to declare variables in JavaScript. Single page application is a web app that loads a single HTML page and dynamically updates the content.

• var is function-scoped, let is block-scoped, and const is block-scoped and cannot be reassigned.

• Single page application (SPA) is a web application that interacts with the user by dynamically rewriting the current page rather than loading entire new pages from the server.

• Example of SPA: Gmail, where cl...read more

I used the Page Object Model (POM) in my automation framework.

• Implemented separate classes for each web page or component

• Encapsulated the page elements and related functionalities within each class

• Promoted reusability and maintainability of the automation code

• Improved readability and scalability of the test scripts

Data can be passed between components using props, event emitters, services, or state management libraries.

• Use props to pass data from parent to child components

• Use event emitters to emit events and pass data from child to parent components

• Use services to create a centralized place to store and share data between components

• Use state management libraries like Redux or Vuex for managing global state across components

I have worked with various processes including project management, team coordination, and workflow optimization.

• Project management processes such as creating timelines, setting milestones, and tracking progress

• Team coordination processes like assigning tasks, conducting meetings, and resolving conflicts

• Workflow optimization processes such as identifying bottlenecks, implementing efficiency improvements, and measuring results

Time travel in delta tables refers to the ability to query data as it existed at a specific point in time.

• Delta tables allow you to query data as it existed at a specific version or timestamp.

• This feature is useful for auditing, debugging, and analyzing historical data changes.

• You can use time travel queries with Delta Lake's versioning and timestamp capabilities.

READ reads data from a file into a variable, while READ INTO WS-VARIABLE reads data into a specified work area.

• READ is used to read data from a file into a variable in COBOL.

• READ INTO WS-VARIABLE is used to read data into a specified work area in COBOL.

• READ example: READ FILE-NAME INTO DATA-VARIABLE.

• READ INTO WS-VARIABLE example: READ FILE-NAME INTO WS-WORK-AREA.

SQL queries of group by and SQL joins

• GROUP BY is used to group rows that have the same values in a specified column

• JOIN is used to combine rows from two or more tables based on a related column between them

• INNER JOIN returns only the matching rows from both tables

• LEFT JOIN returns all the rows from the left table and matching rows from the right table

• RIGHT JOIN returns all the rows from the right table and matching rows from the left table

Static call is determined at compile time while dynamic call is determined at runtime.

• Static call is resolved by the compiler based on the type of the object at compile time.

• Dynamic call is resolved by the runtime environment based on the actual type of the object at runtime.

• Static call is faster but less flexible, while dynamic call is slower but more flexible.

• Example: In Java, static method calls are resolved at compile time, while dynamic method calls using interfaces are ...read more

Lazy evaluation is a programming technique where expressions are not evaluated until their results are actually needed.

• Expressions are only evaluated when their results are needed

• Helps improve performance by avoiding unnecessary computations

• Commonly used in functional programming languages like Haskell

CCW stands for Counterclockwise while DIS CCW stands for Disconnected Counterclockwise.

• CCW refers to a direction of rotation that is opposite to the clockwise direction.

• DIS CCW refers to a situation where something is disconnected from its counterclockwise rotation.

• Example: Turning a screw counterclockwise is CCW, while a disconnected counterclockwise rotation could refer to a malfunctioning gear.

• Example: In a motor, CCW rotation is normal operation, but a disconnected counte...read more

Observables are streams of data that can be observed over time, while promises represent a single value that may be resolved in the future.

• Observables can emit multiple values over time, while promises can only resolve once with a single value.

• Observables can be cancelled, while promises cannot be cancelled once they are resolved.

• Observables are lazy, meaning they do not emit values until they have a subscriber, while promises are eager and immediately start executing when cr...read more

Rxjs operators are functions that enable complex asynchronous code to be easily composed in a declarative manner.

• Creation operators: of, from, interval, timer

• Transformation operators: map, pluck, mergeMap, switchMap

• Filtering operators: filter, take, takeUntil, distinctUntilChanged

• Combination operators: merge, concat, combineLatest, zip

• Utility operators: tap, delay, finalize, catchError

PECI stands for Problem, Etiology, Context, and Intervention, while PICOF stands for Population, Intervention, Comparison, Outcome, and Timeframe.

• PECI is used in problem-solving to identify and address issues, while PICOF is used in research to formulate a research question.

• PECI focuses on the problem, its causes, the context in which it occurs, and potential interventions to address it.

• PICOF focuses on defining the population of interest, the intervention being studied, the ...read more

SQL CODE -803 vs -811

• SQL CODE -803 indicates a duplicate key error, meaning a unique constraint violation.

• SQL CODE -811 indicates a result set that is not unique, meaning a select query returned multiple rows when only one was expected.

Framework explanation

• A framework is a set of guidelines, libraries, and tools used to develop software applications

• It provides a structure for developers to build upon and ensures consistency in coding practices

• Frameworks can be front-end (like React or Angular) or back-end (like Spring or Django)

• They help streamline development process and improve code quality