TELUS Digital Technical Lead Interview Questions and Answers

Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to be used for different data types or classes.

• Examples include method overloading and method overriding in object-oriented programming.

Method overriding is a feature in object-oriented programming where a subclass provides a specific implementation of a method that is already provided by its parent class.

• Occurs in inheritance when a subclass provides a specific implementation of a method that is already provided by its parent class

• The method in the subclass must have the same name, return type, and parameters as the method in the parent class

• Allows fo...read more

An interceptor is a design pattern commonly used in software development to capture and manipulate incoming and outgoing requests.

• Interceptors can be used for logging, authentication, authorization, error handling, and more

• In Angular, interceptors can be used to modify HTTP requests before they are sent to the server

• In Spring framework, interceptors can be used to intercept client requests and server responses

A filter in Spring is a component that intercepts incoming requests and outgoing responses, allowing for pre-processing and post-processing.

• Filters are used for tasks such as logging, authentication, authorization, and more

• Filters can be configured in the Spring application context

• Examples of filters in Spring include CharacterEncodingFilter, HiddenHttpMethodFilter, and CorsFilter

My contribution as a Technical Lead includes leading a team, providing technical guidance, resolving technical issues, and ensuring project success.

• Leading a team to achieve project goals

• Providing technical guidance and mentorship to team members

• Resolving technical issues and challenges

• Ensuring project success through effective planning and execution

I have led a team in developing a new feature for our product, involving designing, coding, testing, and deployment.

• Led a team in developing a new feature

• Designed the architecture for the feature

• Coded the functionality using Java and Spring Boot

• Tested the feature using JUnit and Mockito

• Deployed the feature to production environment

I can join within 2 weeks.

• I can start within 2 weeks of receiving an offer.

• I need to give notice to my current employer.

• I may need time to relocate if necessary.

My last interview went well, I was able to showcase my technical skills and experience effectively.

• Prepared thoroughly by reviewing common technical interview questions

• Highlighted my experience leading technical teams and projects

• Demonstrated problem-solving skills with real-life examples

• Received positive feedback on my communication and teamwork abilities

Yes, I am ready to travel for work as needed.

• I am willing to travel for client meetings, conferences, and team collaborations.

• I have previous experience traveling for work in my current or past roles.

• I understand the importance of face-to-face interactions in a technical lead role.

Yes, I regularly communicate with my reporting manager to provide updates and discuss any issues or concerns.

• Regularly scheduled check-ins with reporting manager

• Provide updates on project progress

• Discuss any issues or concerns

• Seek guidance and feedback from reporting manager

I excel as an individual contributor and transition smoothly into a team lead role by leveraging my technical expertise and leadership skills.

• Demonstrate strong technical skills and consistently deliver high-quality work as an individual contributor.

• Proactively seek opportunities to mentor and guide team members, showcasing leadership potential.

• Communicate effectively with team members, fostering collaboration and driv...read more

I am a seasoned Technical Lead with experience in leading projects from conception to completion.

• Led a team of developers in the development of a new e-commerce platform

• Implemented agile methodologies to improve project efficiency

• Collaborated with stakeholders to gather requirements and ensure project alignment

Springboot is a framework that simplifies the development of Java applications by providing a set of tools and conventions.

• Springboot uses embedded servers like Tomcat or Jetty to run applications.

• It auto-configures many components based on dependencies added to the project.

• It uses annotations like @SpringBootApplication to define the main class of the application.

• Springboot uses Spring Framework's Inversion of Control...read more

SAGA design pattern is used for managing long-lived transactions in distributed systems.

• SAGA pattern breaks down a long transaction into a series of smaller, more manageable steps.

• Each step in the SAGA pattern is a separate transaction that can be rolled back if needed.

• SAGA pattern ensures that the overall transaction is eventually consistent.

• Examples of SAGA pattern implementation include using compensating transactio

I have over 10 years of experience in software development, with a focus on leading teams and delivering high-quality products.

• Led multiple cross-functional teams in developing and launching successful products

• Extensive experience in full stack development, including front-end and back-end technologies

• Strong background in Agile methodologies and project management

• Collaborated with stakeholders to define project require

I have worked on various projects including a mobile app for tracking fitness goals and a web application for managing inventory.

• Developed a mobile app using React Native to track fitness goals and provide workout plans

• Built a web application using Angular for managing inventory and tracking sales

• Implemented RESTful APIs for communication between front-end and back-end systems

SQL is a relational database management system, while NoSQL is a non-relational database management system.

• SQL databases are table-based and have a predefined schema, while NoSQL databases are document-based, key-value pairs, graph databases, or wide-column stores.

• SQL databases are good for complex queries and transactions, while NoSQL databases are better for hierarchical data storage and real-time web applications.

• Ex...read more

Dependency Injection is a design pattern where components are given their dependencies rather than creating them internally.

• Allows for easier testing by mocking dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Example: Constructor injection, Setter injection, Interface injection

There are three types of LifeTime Scopes in Dependency Injection: Transient, Scoped, and Singleton.

• Transient: Objects are created each time they are requested.

• Scoped: Objects are created once per request.

• Singleton: Objects are created only once and shared across the application.

Implementing DIP in .NET Core

• Create an interface for the dependency

• Implement the interface in a separate class

• Inject the dependency into the consuming class

• Use dependency injection container to resolve dependencies

CTE stands for Common Table Expressions, a temporary result set that can be referenced within a SELECT, INSERT, UPDATE, or DELETE statement.

• CTEs are defined using the WITH keyword in SQL.

• They can improve readability and maintainability of complex queries.

• CTEs can be recursive, allowing for hierarchical data querying.

• Example: WITH cte AS (SELECT * FROM table_name) SELECT * FROM cte;

• Example: WITH RECURSIVE cte AS (SELECT...read more

Abstract classes can have both abstract and non-abstract methods, while interfaces can only have abstract methods.

• Abstract classes can have constructors, fields, and methods, while interfaces cannot.

• A class can only extend one abstract class, but it can implement multiple interfaces.

• Abstract classes are used to define a common behavior for subclasses, while interfaces are used to define a contract for classes to implem...read more