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0-YuvrajSingh/README.md
Yuvraj Singh

Backend Developer | Java, Spring Boot, and secure REST APIs

LinkedIn GitHub LeetCode

About

Computer Science undergraduate at AKGEC, focused on building secure backend systems with Java and Spring Boot. I work with REST APIs, JWT authentication, role-based access control, relational data modelling, and Docker-based delivery.

Projects

AgileTrack | Project and task management platform

Spring Boot Spring Security JWT PostgreSQL React Docker Flyway

  • Built a JWT-secured REST API with OWNER, MEMBER, and VIEWER roles enforced at the service layer.
  • Designed a five-table PostgreSQL schema with versioned Flyway migrations and a workspace-to-project-to-task hierarchy.
  • Created a React frontend with protected routes, in-memory auth state, and an Axios Bearer-token interceptor.
  • Containerised the full stack with Docker Compose and multi-stage Dockerfiles.
  • Added Bean Validation, global exception handling, and JUnit 5/Mockito tests for service logic and RBAC flows.

MedVault | Medical records platform

Spring Boot Spring Security JWT PostgreSQL React Docker Flyway

  • Implemented PATIENT, DOCTOR, and ADMIN authentication with role-based account activation and doctor-patient assignment.
  • Enforced domain-scoped access control: patients can access their own records, while doctors can access only assigned patients.
  • Added an append-only audit log for medical-record changes and transactional boundaries for atomic record writes.
  • Built a Flyway-managed PostgreSQL schema and Docker Compose deployment with role-specific frontend routes.

Experience

Backend Developer Trainee | Infosys Springboard | Oct 2025 - Dec 2025

  • Implemented JWT-secured Spring Boot REST APIs with role-based authorization.
  • Used @ControllerAdvice and Bean Validation for consistent, structured API error responses.
  • Delivered backend features through agile sprints, code reviews, and collaborative module design.

Virtual Web Development Intern | IBM SkillsBuild (WBCEP Program) | Jul 2025 - Aug 2025

  • Built a MERN food-ordering platform with JWT authentication and REST APIs for authentication, carts, and orders.
  • Applied MongoDB schema validation, tested API contracts with Postman, and followed a Git feature-branch workflow.

Technical skills

Technology icons: Java, Spring, Hibernate, PostgreSQL, MySQL, MongoDB, React, JavaScript, Docker, Git, Maven, and Postman
  • Backend: Spring Boot, Spring Security, Spring Data JPA/Hibernate, REST APIs, JWT, Node.js
  • Frontend: React, Axios, protected routes
  • Data: PostgreSQL, MySQL, MongoDB, Flyway
  • Testing: JUnit 5, Mockito
  • Fundamentals: Data Structures and Algorithms, OOP, DBMS, Operating Systems, Computer Networks

Highlights

  • Solved 655+ programming problems across platforms.
  • LeetCode: 1666 rating, 356+ problems, and 16 contests.
  • CodeChef: 1399 rating, 297+ problems, 40 contests, with a 1478 maximum rating.
  • Qualified GATE 2026 (CS/IT).

Popular repositories Loading

  1. dsa-java-solutions dsa-java-solutions Public

    Structured Java implementations of core Data Structures and Algorithms for interview preparation.

    Java 1

  2. AgileTrack AgileTrack Public

    Multi-tenant engineering project and delivery management platform for software teams with releases, dependencies, change governance, RBAC, audit history, and release readiness.

    Java 1 1

  3. MedVault MedVault Public

    Secure role-based medical record management platform with JWT authentication, Spring Security, PostgreSQL, React, and audit logging.

    Java 1

  4. 0-YuvrajSingh 0-YuvrajSingh Public

    Backend-focused Java developer building secure, scalable systems with Spring Boot and PostgreSQL.

  5. openmrs-core openmrs-core Public

    Forked from openmrs/openmrs-core

    OpenMRS API and web application code

    Java

  6. Industrial_Knowledge_Intelligence Industrial_Knowledge_Intelligence Public

    Forked from jayeshkumarsingh11/Industrial_Knowledge_Intelligence

    JavaScript