M A N I S H K U M A R

Java Backend Developer

Java Backend Developer with hands-on experience designing and building RESTful APIs using Spring Boot and MySQL. Skilled in implementing secure authentication using JWT and optimizing backend performance. Strong foundation in Data Structures, OOP, and scalable system design. Built backend systems handling 50+ requests/min with improved response efficiency.

Gurugram
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Certifications
Work Experience
Software Developer
Kosuri Labs Pvt. Ltd
Aug 2026 — Present
  • Developed RESTful APIs for applications, enhancing functionality
  • Implemented security measures to protect user data
  • Integrated user-facing elements with frontend developers
Software Developer (Intern)
Kosuri Labs Pvt. Ltd
May 2026 — Aug 2026
  • Built and tested backend systems using Spring Boot
  • Collaborated with the team to design scalable REST APIs
  • Participated in code reviews, contributing to performance optimization
HR Executive
Different OrganizatoinsGurugram
Apr 2017 — Feb 2026
Projects
Finance Record System

Engineered RESTful APIs handling 50+ requests/min under test load. Optimized MySQL queries, reducing response time by 30+%. Implemented global exception handling, reducing API failure cases by 25+%. Secured endpoints using JWT authentication, protecting 100% of user data access. Structured application using layered architecture (Controller-Service-Repository) improving maintainability.

Spring BootMySQLJavaSpring SecurityJWTHibernate
Flyease - Flight Booking System

Developed booking APIs supporting multi-entity operations (User, Flight, Booking). Implemented JWT-based authentication reducing unauthorized access risk by ~90%. Designed modular layered architecture improving maintainability and reducing future change effort by ~40%. Built CRUD operations using Spring Data JPA for core modules.

Spring BootSpring Data JPASpring SecurityMavenJavaJWTSwagger
Skills
REST API DesignJWT AuthenticationRole-Based Access ControlOOOPData StructuresException HandlingAPI OptimizationMySQLSpring BootSpring SecurityJavaHTML5CSS3JavaScriptJUnitGITSwaggerEclipseMavenGithubPostmanNew skill
Education
Bachelor of Arts
School of Open Learning (Delhi University)
Certifications
Certificate of Completion Java Basic
HackerRank
Mar 2026
View credential
Java Spring Boot & Microservices - In progress
Mar 2026