Sajan Kumar

About

Software developer with hands-on experience building backend and full-stack applications using Java, Spring Boot, and REST APIs. Experienced with Docker, Kubernetes, Jenkins, MongoDB, and AWS for scalable CI/CD-driven systems.

Experience

• Internship Trainee
  NEXT24 Technology and Services
  Jun 2024 – Aug 2024

  Assisted in building and documenting RESTful endpoints using Java and Spring Boot. Worked with MongoDB to implement data schemas and performed CRUD operations. Utilized Jenkins for automated build triggers and monitored deployment logs to identify and resolve integration errors.

Education

• Bachelor of Engineering
  Government College of Engineering and Technology, Jammu
  Computer Science · Sep 2021 – Sep 2025
• High School
  MHAC School Nagbani, Jammu
  Non-Medical with Computers · Apr 2019 – Apr 2021

Skills

• Backend development <3 months
• Python <3 months
• Java 3 to 6 months
• React <3 months
• API Integration Understanding 3 to 6 months
• Data Structures and Algorithms <3 months
• Oop <3 months
• Advanced DBMS <3 months

Tools / apps / platforms

• Amazon Web Services AWS 3 to 6 months
• Docker <3 months
• Git <3 months
• GitHub <3 months
• Jenkins CI 3 to 6 months
• Kubernetes <3 months
• MongoDB 3 to 6 months

Projects

• Trainee Task Management System
  React, Spring Boot, MongoDB, Jenkins

  Developed a web application for managing trainee tasks with role-based login, task assignment, and progress tracking. Built using React, Spring Boot, MongoDB, and integrated Jenkins for automated CI/CD pipelines. Designed RESTful APIs for smooth communication between frontend and backend ensuring scalable architecture.

• B2B Banking Ledger and Fraud Detection Engine
  Java, Spring Boot, MongoDB, Jenkins, Docker, Kubernetes (K8s)

  Built backend services in Java and Spring Boot for a double-entry ledger system, implementing a synchronous fraud-detection rule engine and MongoDB multi-document ACID transactions. Set up a Jenkins CI/CD pipeline to automate testing, building, and containerization of the backend on every commit. Created multi-stage Docker images for the Spring Boot backend and authored Kubernetes manifests to automate deployment with zero-downtime rolling updates.

• Healthcare App GitOps Pipeline
  Jenkins, Docker, Kubernetes (K8s), Git, Java Spring Boot

  Containerized a full-stack, multi-service doctor-booking application and designed its automated infrastructure deployment pipeline. Built a Jenkins CI pipeline triggered by GitHub webhooks to automatically compile code and package optimized, multi-stage Docker images. Authored Kubernetes manifests to automate service scaling and zero-downtime rolling updates via GitOps.