TechFerry Full Stack Software Developer Interview Questions and Answers

The test contains aptitude ques and one coding ques

Q1. They asked about oops concepts in depth
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Q2. They also asked about dbms concepts
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Q3. And one coding ques the ques the interviewer asked is palindrome number
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Problem solving aptitude test

Small application based on react

Data structure Hash Map problem and java 8 code

Coding singlton code and immutable code hashcode equals java 8 code data structure spring boot microservicis

Q1. How was your project info details
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Q2. What about your qualifications
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Q1. C#, OOPS, JAVASCRIPT
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Q1. Dot net core, design pattern
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Q1. If a application is running slow what process would you follow to find root cause of this? Specify for database , backend api and frontend side.
Ans. 
Process to find root cause of slow application for database, backend api and frontend side.
• Check server logs for errors and warnings

• Use profiling tools to identify bottlenecks

• Optimize database queries and indexes

• Minimize network requests and optimize API responses

• Reduce image and file sizes for faster loading

• Use caching to reduce server load

• Check for memory leaks and optimize memory usage
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Q2. Basic API questions- DI, Ef querying databs Angular basics
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Q3. Basic sql queries, joins
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Q1. Diff. Between promise and observable
Ans. 
Promise is a one-time event while Observable can emit multiple values over time.
• Promise is used for asynchronous operations that will return a single value or an error.

• Observable is used for asynchronous operations that can return multiple values over time.

• Promise can be in one of three states: pending, fulfilled, or rejected.

• Observable can emit values, errors, and completion events.

• Promise can be converted to an Obser...read more
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Q2. Lifecycle hooks in angular
Ans. 
Angular lifecycle hooks are methods that get called at specific stages of a component's lifecycle.
• ngOnInit() - called after the component is initialized

• ngOnChanges() - called when the component's input properties change

• ngOnDestroy() - called just before the component is destroyed

• ngAfterViewInit() - called after the component's view has been initialized

• ngAfterContentInit() - called after the component's content has been
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Q3. Jwt security implementation in angular
Ans. 
Jwt security implementation in Angular
• Install angular-jwt package

• Create an auth service to handle token storage and retrieval

• Add an HttpInterceptor to attach the token to outgoing requests

• Use guards to protect routes based on authentication status
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Q1. Can you tell me about yourself?
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Q2. What are your strengths and weaknesses?
Ans. 
Strengths include problem-solving skills and adaptability. Weaknesses include perfectionism and time management.
• Strengths: problem-solving skills, adaptability

• Weaknesses: perfectionism, time management

• Example: I excel at quickly identifying and resolving complex technical issues, but I sometimes struggle with prioritizing tasks effectively.
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Q1. What are the types of relationships in Database Management Systems (DBMS)?
Ans. 
Types of relationships in DBMS include one-to-one, one-to-many, and many-to-many relationships.
• One-to-one relationship: Each record in one table is related to only one record in another table.

• One-to-many relationship: Each record in one table can be related to multiple records in another table.

• Many-to-many relationship: Multiple records in one table can be related to multiple records in another table.

• Examples: One-to-o...read more
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Q2. What is the concept of a pointer in programming?
Ans. 
A pointer in programming is a variable that stores the memory address of another variable.
• Pointers allow for direct manipulation of memory locations

• They are commonly used in languages like C and C++

• Example: int *ptr; ptr = # // ptr now points to the memory address of num
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For a fresher there will be aptitude interview

Q1. There will be technical questions in the round 2
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Q2. 1.What is jvm jre and jdk 2.what is null and its value 3.what is pass by reference 4.what is regular expression
Ans. 
1. JVM is a virtual machine that executes Java bytecode. JRE is a runtime environment that includes JVM and libraries. JDK is a development kit that includes JRE and tools for developing Java applications. 2. Null is a special value that represents the absence of a value. Its value is typically used to indicate that a variable does not refer to any object. 3. Pass by reference is a method of parameter passing where the...read more
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