Ranjan Kumar

Java Backend Developer

Bengaluru, Karnataka 0+ yrs exp 81 · Excellent

About

Software Engineer with a B.Tech in Information Technology (2025) and hands-on project experience in Java backend development using Spring Boot, Spring MVC, and Spring Data JPA. Currently pursuing Java Full Stack training at JSpyder, Bengaluru, strengthening skills in RESTful API design, relational database systems (MySQL, PostgreSQL), and full-stack development practices. Skilled in building normalized relational schemas and transactional business logic. Solved 400+ DSA problems on LeetCode and CodeChef, reflecting strong problem-solving and analytical ability. Eager to contribute to a collaborative engineering team as a backend developer.

Skills & Expertise (24)

Maven Intermediate

5.0/10

Years Exp

CSS Intermediate

5.0/10

Years Exp

HTML Intermediate

5.0/10

Years Exp

Postman Intermediate

5.0/10

Years Exp

IntelliJ IDEA Intermediate

5.0/10

Years Exp

GitHub Intermediate

5.0/10

Years Exp

Git Intermediate

5.0/10

Years Exp

Normalization Intermediate

5.0/10

Years Exp

Schema Design Intermediate

5.0/10

Years Exp

DBMS Concepts Intermediate

5.0/10

Years Exp

Postgresql Intermediate

5.0/10

Years Exp

MySql Intermediate

5.0/10

Years Exp

Core Java Intermediate

5.0/10

Years Exp

RESTful APIs Intermediate

5.0/10

Years Exp

Hibernate ORM Intermediate

5.0/10

Years Exp

Spring Data JPA Intermediate

5.0/10

Years Exp

Spring Boot Intermediate

5.0/10

Years Exp

Spring MVC Intermediate

5.0/10

Years Exp

Spring Core Intermediate

5.0/10

Years Exp

SDLC Intermediate

5.0/10

Years Exp

Data Structures & Algorithms Intermediate

5.0/10

Years Exp

Collections Framework Intermediate

5.0/10

Years Exp

Exception Handling Intermediate

5.0/10

Years Exp

OOP Intermediate

5.0/10

Years Exp

Work Experience

Developer

Courier & Logistics Tracking System

May 2026 - Jul 2026

Developed a Spring Boot REST API covering 7 core modules including shipments, customers, packages, payments, warehouses, delivery agents, and tracking history. Designed RESTful APIs using a 3-layer architecture with Controllers, Services, and Repositories, implementing Request/Response DTOs, validation, ModelMapper, and Spring Data JPA for clean data handling. Implemented transactional shipment creation connecting 4+ related entities such as packages, payments, warehouses, delivery agents, and tracking history while maintaining database consistency. Added 5+ shipment-management features including status updates, delivery-agent and warehouse assignment, tracking-number search, filtering, pagination, and sorting for efficient shipment operations.

Developer

Online Banking System

Nov 2025 - Feb 2026

Developed a Spring Boot banking REST API managing 3 core modules—banks, customer accounts, and addresses with structured REST endpoints. Implemented 4 core banking operations—account creation, deposits, withdrawals, and fund transfers with validations for balance, transaction amounts, unique account numbers, and account relationships. Designed a layered Controller-Service-Repository architecture using Spring Data JPA and Hibernate, implementing 2 JPA relationship types: One-to-Many and One-to-One. Added 3+ supporting features including CRUD operations, account search, pagination, and sorting to improve data management and retrieval.