Fullstack Developer

Thompson ‘Tom’ Rajan Full Stack Java Developer

845-***-**** ********@*****.***

SUMMARY

● A result-driven Full Stack Java Developer with 5+ years of experience working in enterprise end to end, and web applications using various technologies including Spring, Angular, React, RESTful Web Service, and AWS in all stages of SDLC from Requirement Gathering through Maintenance.

● Expertise in Java concepts such as OOP, Collections Framework, Generics, Multithreading, Stream, Concurrency APIs, and design patterns such as Factory, Adapter, Facade, Decorator, and IoC.

● Experienced in building Enterprise End to End applications from the Ground Up with Spring Boot, Angular, and React from planning, design analysis through deployment over AWS ECR registries.

● Experienced in creating RESTful services using AOP with Spring REST and Data JPA with OAuth2 and JWT authentication including endpoint testing, Spring Actuators, and documentation with Swagger and Hal Browser as well as building microservices architectures with Spring Cloud and AWS

● Expertise in performance profiling, ability to identify performance improvements and memory optimizations

● Experienced working with RDBMS / NoSQL databases including Postgres, MySQL, Oracle, MongoDB, DynamoDB.

● Created front end optimization using client-side templating using Angular and React frameworks for dynamic Single Page Applications with Material UI as well as BootStrap to build customized themes and interactive elements.

● Experienced in creating IAM roles for using a specific set of AWS services and monitoring resources with CloudWatch as well as configuring VPCs and Security Groups.

● Experienced with AWS SDK and CLI to manage AWS services and performance optimizations with ElastiCache in addition to building web services with serverless architecture using AWS Lambda function to invoke services such as SES and SNS as well as using API Gateways and S3 to trigger Lambdas.

● Experience in developing middleware applications using a variety of modern technologies: Mongo, Redis, SQL Server, Pivotal Cloud Foundry, Rabbit MQ, Angular, Spring

● Experienced in CI/CD to build docker images and creating customized deployment pipelines with Jenkins and GitLab CI/CD as well as collaborating and integrating workflows with various teams on GitLab, Bitbucket, & managed in Jira.

● Experienced working with Epic integration to incorporate applications with patient records and Deep Packet Analysis using HL7 packets over wired and wireless network adapters.

● Experienced in building Distributable Desktop Applications with Electron and ReactJS along with installers for Windows, macOS, Debian, and RHEL Linux systems as well as building Mobile Apps with React Native for iOS and Android.

● Built storage servers and AdBlock servers over embedded systems w/ Raspberry Pi Model B and Zero W.

● Experienced in building tests with JUnit, Mockito, and logging with Log4J. TECHNICAL SKILLS

Programming Languages / Scripting /

Security Tools

Java, Golang, Python, Kotlin, Scala, R, C, C++, Zsh, Bash, Batch, Nmap, Tshark, Wireshark

Backend / Microservices / Web Services Spring, Spring Boot, Gorilla, Flask, Django, Scikit-Learn, Play Framework, Spring Cloud, REST / SOAP service, Node.js, JNI

Databases / ORMs / Unit Testing Postgres, MySQL, Oracle, SQLite, MongoDB, DynamoDB, Spring Data JPA, Hibernate, GORM, SQLAlchemy, Mockito, JUnit, PL/SQL, PL/pgSQL, Redis Frontend Technologies / Desktop /

Mobile

Angular, ReactJS, Thymeleaf, Electron, React Native, Material UI, BootStrap, JSP, JSX, TypeScript, jQuery, JavaScript, HTML5, CSS Deployment Tools / AWS / Embedded

Systems

Jenkins, Gitlab CI/CD, Docker, Docker Compose, Kubernetes, ECR, ECS, EC2, EBS, RDS, Lambda, S3, API Gateway, SNS, SES, VPC, Java AWS SDK, Cloudwatch, NSIS, Electron Forge Server, Raspberry Pi 4 Model B, Zero W IDEs / Web Servers / Data Process IntelliJ, Eclipse, Xcode, IBM WebSphere, GlassFish, Tomcat, Apache HTTP Server, Nginx, Bitnami, JMS, Kafka, RabbitMQ, Pivotal Cloud Foundry Project Management / Version Control /

Dependency Management

Jira, Trello, Zoho Projects, ClickUp, Bitbucket, Gitlab, GitHub, Git, Maven, Gradle, Anaconda, pip, NPM

EXPERIENCE

MediTechSafe, Cincinnati OH May 2018 - Current

Role: Full Stack Java Developer/Angular/Python Django Description: MediTechSafe, located in Cincinnati Ohio, is a medical device and IoT cybersecurity company. It has the unique experience of combining healthcare, clinical engineering, cybersecurity, and software development while offering the right mix of Information Technology (IT) and Operations Technology (OT) required for enabling transformation in healthcare via digital innovations. Being a start-up firm during my time of joining, I have been given diverse responsibilities to handle risk assessment of medical devices located in hospitals and clinics since medical patients' personal identity info can be compromised over the internet. As a result, I built the Enterprise Risk Management Platform App from the ground up in Angular based on a Full Stack Java Application backed by a Spring Boot Backend. I also built a desktop application using ReactJS and Electron with a Python Django based backend Service. Using a Microservices Architecture, I built services to monitor for device vulnerabilities to be used on the web application as well as the desktop application. Responsibilities:

● Involved in all phases of SDLC from requirements gathering to maintenance and participated in sprint meetings to discuss daily tasks.

● Created an Enterprise Risk Management Platform App from the ground up selectively registering medical devices from the hospital inventory provided, on the basis of risk factors that might compromise patient data and to confirm the working status of devices and ensure personal data from patients is secure. The ERMP App is built in an Angular based Full Stack App backed by a Spring Boot Backend for users to manage risk profiles of medical devices in hospitals or clinics.

● Design and build the Spring Boot application including REST controllers with entity DAOs and services using Data JPA with added performance optimization along with Spring Actuators and Swagger UI for API documentation. Use Spring MVC to add user registration and login views. The user data are stored in Postgres RDS instances

● Secured application performance using Spring Security to enable API authentication with OAuth2

● A Microservice Architecture with Spring Cloud on the backend application is built using Eureka Server and Fein clients to develop a service to monitor device vulnerabilities along with test cases using Mockito. This service is used across the web app as well as the desktop app.

● Medical device risk assessment information with their 3D sprite image sets is stored in S3 buckets as BLOB objects so that it can be used on the frontend application as well as in mobile applications.

● Build the frontend with Angular with the discussed modules and components with styles in combination with Angular Material UI and Bootstrap.

● Implement Angular custom directives to add custom behaviors to UI elements and custom pipes to simplify frontend data processing.

● Designed using Angular routing with route guards, to handle authorized pages and services to authenticate JWT tokens with HTTP interceptors to add authorization headers to API requests.

● Design and developed a desktop application that scans and profiles targeted medical devices for vulnerabilities and reports to the ERMP app using Electron and ReactJS as the frontend view and Django backend service.

● Perform Deep Packet Analysis using HL7v2 standard packets to profile medical devices based on DICOM headers and integrate patient records using Epic APIs on the Django backend service. Both the Electron React frontend and Django backend service is built and bundled with NPM.

● A distributable install package for Windows is built using NSIS with MUI2. Electron Forge is used to package for macOS, Debian, and RPM Linux to build DMGs, RPM, and DEB application installers respectively.

● Use Java AWS SDK to create AWS Lambda functions on the Spring Boot backend application to invoke SES and SNS services through an S3 trigger whenever a new device is added and also with API Gateway triggers when a new vulnerability is identified for a registered medical device.

● Packaged the Spring Boot backend app to a docker image and deployed it to the ECR container registry through a Jenkins pipeline. Version source code with GitLab and coordinate with the development team on Jira.

● Initiated beta testing campaign to distribute the beta application and gather feedback to make changes on the application through Jira

Environment: Java 8, Python, C, Angular, Spring Boot, Electron, ReactJS, Django, Git, GitLab, AWS S3, ECR, EC2, RDS, SES, SNS, EBS, AWS Batch, Jenkins, Docker, Postgres, ReactNative, Nginx, Tomcat, BootStrap, Material UI, TypeScript, jQuery, JSP, IntelliJ, PyCharm, Xcode, Jira, Mockito, Maven. Healthreveal, New York NY April 2017 - April 2018

Role: Full Stack Developer

Description: Healthreveal is a privately held healthcare based firm that works closely with teaching hospitals, clinical research organizations, and physician-scientists to provide IT solutions and AI services in medical imaging and radiology to clinicians and patients. A Patient Management Portal is built using Angular frontend and Spring Boot backend. The PMP allows clinics to manage patients and run imaging services on patient X-rays and CT scans to help identify and diagnose diseases. The AI modules were written in python. In order to bind python objects and methods with the Spring Boot backend, the Java Native Interfaces are created so that it can call python objects and methods in Java. The PMP makes use of AWS services to store PACS images on S3 and invoke them using Lambda functions as well as trigger SNS topics. The PMP also interacts with patient records using Epic APIs to update and manage patient data on the portal. Both the frontend and the backend were installed on separate docker images and are deployed to the ECR through a single Gitlab CI/CD pipeline. Responsibilities:

● Developed the Patient Management Portal working in all phases of the Software LIfeCycle Development Process: gathering information, design, analysis, development, deployment, and maintenance.

● Collaborated with the team and participated in daily SCRUM sprint meetings to meet deadlines using the AGILE methodology.

● Designed and built the Spring Boot application with the required entities, services and controllers, making use of Data JPA in addition to second level caching with EHCache along with Spring Actuators and document REST endpoints with Swagger UI.

● Utilized Spring Security to build UserDetails based on clinic and patient accounts with corresponding roles from the RDS to generate JWT tokens using OAuth2 and develop clinic and patient registration modules with Spring MVC and JSP. The patient registration module validates patient data using the Epic API

● Created a Lambda function to invoke the S3 bucket and trigger an SNS whenever a new image is uploaded or removed and also a Lambda function that is invoked by an API Gateway to trigger an SNS to send out patient validation status using the AWS SDK.

● Defined JNI interface methods for binding python objects and methods into the Spring Boot application and created a microservice architecture with Spring Cloud that takes PACS images to provide diagnostic results through a REST controller to the Angular application.

● Built dynamically designed modules and components required for managing files and images on the PMP

● Optimized performance using Angular by distributing the load from the back to the front creating client-side rendering.

● Created an Angular frontend using Angular’s dynamic Single Page Application with Angular Material to create custom themes that work on the web, mobile and tablet devices

● Created LifeCycle Hooks and Injected dependencies into Angular components using _HTTP services invoked from the back end.

● Designed for users to create events that are bound two ways so that Angular components can communicate with each other from front to back or from back to front.

● Deployed the application by building the Angular and Spring Boot application into separate Docker images and pushed them to ECR with a single GitLab CI/CD pipeline.

● Managed frontend and backend projects on GitLab for version control.

● Used Jira to collaborate with the development team.

● Implemented End to End testing code reviews and Generating the test reports at the unit level and integration level

Environment: Java 8, Python, Angular, Spring Boot, JNI, Git, GitLab, AWS S3, ECR, EC2, RDS, SNS, API Gateway, Docker, GitLab CI/CD, Postgres, Nginx, Tomcat, BootStrap, Material UI, TypeScript, jQuery, IntelliJ, PyCharm, Jira, Mockito, Maven, NPM.

Liberty General Insurance, Mumbai India Feb 2015 - March 2017 Role: Java / Frontend Developer

Description: Liberty General Insurance is a private general insurance company headquartered in Mumbai, India. It has partnered with over 30 district cooperative banks to help issue vehicle and personal accident insurance, particularly to farmers. The online insurance management system helps clients to get a quote, buy insurance, manage their accounts online, make a claim, and get assistance based on the type of insurance. During my tenure at LGI, I worked on health insurance and individual personal accident insurance. The health insurance module handles the deductibles and allows customers to view the packages they’re signed up for, make a claim for medical expenses, and also make payments if the insurance type is independent. The personal accident module allows customers to view packages, make a claim, and payments. These also send out a personalized email notification on the status of the account based on the appropriate circumstances. The web application is developed with Angular and Spring and is deployed on the AWS ECR container registry through a Jenkins pipeline. Responsibilities:

● Created the Health Insurance Module which handles the deductibles and allows customers to view packages as well as the Individual Personal Accident Insurance Module which allows customers to view packages and make payments

● Participated in requirement gathering, development, deployment, and maintenance phases of SDLC and was involved in daily sprint meetings to discuss tasks.

● Design and develop health insurance and personal accident modules using SpringMVC framework and Dependency Injection to handle business logic and presentation and use Microservice architecture to build on top of an existing application.

● Use Hibernate ORM to create the mapping for entity beans and the database schema and maintain second- level caching to optimize CRUD operations at scale.

● Used Spring REST to build DAOs and services and controllers along with Spring Actuators and Swagger UI for API documentation and maintain user data in Oracle RDS instances.

● Use Spring Security to implement authentication and authorization with OAuth JWT tokens and build Single Sign-On functionality across all modules

● Use Spring Session to trace user sessions on the application platform as well as Spring Batch to be able to process large amounts of data without causing performance overhead on the application.

● Build Angular frontend module views with Bootstrap and jQuery to the existing application with Routes and Route Guards.

● Create Pipes to process data on the component template and Angular Directives to add custom effects on the template as well as Angular Services to perform backend API requests

● Intercept frontend HTTP headers with user web authorization token to authorize API requests with the Spring backend

● Use Java AWS SDK to create Lambda functions to invoke an SES notification whenever a new claim is detected and also when a payment is made.

● Automate deployment with a Jenkins pipeline by packaging the Spring backend application to a Docker image and pushing it to the ECR registry.

● Version source code with Bitbucket and coordinate with the development team on Jira Environment: Java 8, Angular, Spring, Git, Bitbucket, AWS ECR, RDS, EBS, S3, SES, Jenkins, Docker, Oracle, Nginx, Tomcat, BootStrap, TypeScript, jQuery, JSP, Eclipse, Jira, Mockito, Maven, NPM. EDUCATION

● MS Computer Science - Marist College, Poughkeepsie NY

● BS Information Technology - PSG College of Technology Coimbatore IN

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