ThoughtWorks L2 Engineer Interview Questions and Answers

Q1. Questions around Java 8 features, collections, oop concepts, spring, spring mvc, spring boot and design patterns
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Q2. Internal implementation of hash map and use comparator
Ans. 
Hash map is an internal data structure that maps keys to values. Comparator is used to compare objects for sorting.
• Hash map uses a hash function to map keys to indices in an array

• Comparator is used to compare objects for sorting in collections like TreeSet or TreeMap

• Example of hash map implementation in Java: HashMap

• Example of using a comparator in Java: Collections.sort(list, comparator)
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Q3. Write sample classes spring boot … entity service and controller layers with proper annotations
Ans. 
Sample classes for Spring Boot entity, service, and controller layers with annotations
• Create entity classes with @Entity and @Id annotations

• Create service classes with @Service annotation and inject repository classes with @Autowired annotation

• Create controller classes with @RestController and @RequestMapping annotations

• Use @GetMapping, @PostMapping, @PutMapping, and @DeleteMapping annotations for HTTP methods

• Use @Requ...read more
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Q4. What are the design patterns that you know about
Ans. 
Design patterns are reusable solutions to common software problems.
• Creational patterns: Singleton, Factory, Abstract Factory, Builder

• Structural patterns: Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy

• Behavioral patterns: Chain of Responsibility, Command, Interpreter, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, Visitor
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Q5. What is IOC, dispatcher servlet, actuator and more around spring framework
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Q1. Based upon work
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Q2. Be prepared with aws, Tosca, etc
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Q1. The round comprised of basic multiple choice questions from DBMS, networking, data structure, algorithms and Java/C++ coding.
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This round consisted of flow diagram based aptitude questions. No multiple choices were present.

A simple group discussion on topics related to current affairs.

Q1. An interesting interaction with HR about the company's expectations on hiring you.
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Q1. This was the final round where simple technical questions were asked from topics specified in applicant's resume. Also some basic questions from Networking and data structures.
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Q1. Self introduction and technical what is data factory and explain about the project
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Q2. What is your goals and family background
Ans. 
My goal is to become a highly skilled software engineer and contribute to innovative projects. My family background is supportive and has encouraged my pursuit of a career in technology.
• Goal: Become a highly skilled software engineer

• Contribute to innovative projects

• Family background: Supportive and encouraging

• Pursuit of a career in technology
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Technical MCQ on concepts of Computer Science (Programming, Database, etc)

Flow Chart - Aptitude Round

Q1. Technical Interview. Technical questions based on resume. Some basic programming questions.
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Q1. What are your strengths and weaknesses?
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Q2. Tell me about yourself.
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