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Software Engineer

Platform Commons

1 rounds | 1 Coding problems

avyay kumar singh

Experienced | Mar 2025

Rejected

Interview preparation journey

Journey

My interview preparation journey was insightful. I revised all key topics to strengthen my fundamentals, but some advanced concepts were not fully covered in the course. To handle challenging interview questions, I invested extra time researching and practicing beyond the course material to bridge these gaps.

Preparation

Topics: Java, Springboot, MySQL

Application process

Where: Coding Ninjas Placement Cell

Eligibility: NA, (Salary range: 7-12 LPA)

Interview rounds

Round

Medium

Assignment

Duration

Interview date8 Mar 2025

Coding problem1

1. Student Management System – Feature & Functionality Overview

Design a Student Management System with distinct roles:

Owner/Admin:

Admit students with personal details and multiple addresses (one-to-many).
Upload course details and assign courses to students (many-to-many).
Search students by name and get students enrolled in a course.

Student:

Update profile and addresses.
View assigned courses/topics.
Leave a course.

Authentication:

Admin: Login with credentials.
Student: Validate with student code and date of birth.

Problem approach

1. Created Required Entities Admin Course Role Student StudentAddress (One-to-Many relationship with Student)

2. Defined Enums AddressType (Permanent, Correspondence, Current) CourseType EnrollmentStatus Gender

3. Created DTOs (Data Transfer Objects) To ensure proper data encapsulation and validation, I created DTOs for entities like Student, Course, and StudentAddress.

4. Implemented Repositories, Services, and Controllers Developed Repository Layer using JPA for database interactions. Created Service Layer to handle business logic. Developed Controller Layer to expose REST APIs as per the assignment requirements.

5. Implemented Authentication & Authorization Used JWT-based authentication for Admin, where they log in using username and password via Postman. Used Request Parameters to authenticate students using student_code and date of birth.

6. Established Proper Entity Mappings One-to-Many: Student → StudentAddress Many-to-Many: Student ↔ Course (Mapped using a join table for course enrollment)

7. Used MySQL as the Database Configured MySQL for data storage and ensured proper schema design.

8. Performed Testing with Postman Tested API endpoints for Admin and Student operations. Verified authentication, course assignment, and student details retrieval.