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Muhammad M.

Warsaw, Poland

$20/hr
5.0
2 jobs

๐Ÿ’ผ 8+ Years Building Production-Grade Java Backends for Enterprise & Startups ๐Ÿค Worked with Macy's ยท Backcountry ยท Agrobank ยท Dubai Islamic Bank ๐Ÿ› ๏ธ Spring Boot ยท Microservices ยท AWS ยท PostgreSQL ยท Docker ยท React ยท Full-Stack When It Counts I'm a Senior Java Backend Engineer specializing in building secure, scalable, production-grade systems using Java, Spring Boot, and microservices architecture for enterprise eCommerce, digital banking, and government platforms across the US and UAE. I've built systems serving millions of users at Macy's, delivered nationally regulated banking infrastructure at Agrobank. Every system designed with security, scalability, and long-term maintainability at the core. When the project demands it, I extend into the full stack with React, Next.js, and TypeScript delivering end-to-end without losing the backend focus. ๐“๐ž๐œ๐ก๐ง๐ข๐œ๐š๐ฅ ๐„๐ฑ๐ฉ๐ž๐ซ๐ญ๐ข๐ฌ๐ž Backend (Core): Java ยท Spring Boot ยท Spring Security ยท Spring Cloud ยท Spring Data JPA ยท Hibernate ยท Microservices ยท REST API ยท GraphQL ยท OAuth2 ยท JWT ยท Apache Kafka ยท RabbitMQ ยท Maven ยท Gradle ยท Lombok ยท Liquibase ยท Flyway Frontend: React.js ยท Next.js ยท TypeScript ยท JavaScript ยท Redux ยท Zustand ยท React Query ยท Axios ยท Tailwind CSS ยท Material UI ยท Node.js ยท Vite Databases: PostgreSQL ยท MySQL ยท MongoDB ยท Redis ยท Firebase Cloud & DevOps: AWS (EC2, S3, SNS) ยท Azure ยท Docker ยท Kubernetes ยท CI/CD ยท GitHub Actions Testing & Docs: JUnit ยท Jest ยท Postman ยท Swagger ๐–๐ก๐š๐ญ ๐ˆ'๐ฏ๐ž ๐ƒ๐ž๐ฅ๐ข๐ฏ๐ž๐ซ๐ž๐ ๐— ๐—ฎ๐—ฐ๐˜†'๐˜€ | eCommerce Platform Built Java Spring Boot microservices for catalog, promotions, and cart operations serving tens of millions of shoppers annually. Optimized performance through Redis caching and CDN integration, reducing response times across high-traffic retail events including Black Friday. ๐—•๐—ฎ๐—ฐ๐—ธ๐—ฐ๐—ผ๐˜‚๐—ป๐˜๐—ฟ๐˜† | Online Retail Platform Developed Java backend services for product catalog, inventory management, and order processing at scale. Implemented Redis caching and CDN integration that cut API response times during peak retail traffic. ๐—”๐—ด๐—ฟ๐—ผ๐—ฏ๐—ฎ๐—ป๐—ธ| Digital Banking Platform Architected the backend microservices layer for a nationally regulated digital banking platform using Java, Spring Boot, and PostgreSQL covering account management, transactions, and financial reporting under strict compliance requirements. ๐——๐˜‚๐—ฏ๐—ฎ๐—ถ ๐—œ๐˜€๐—น๐—ฎ๐—บ๐—ถ๐—ฐ ๐—•๐—ฎ๐—ป๐—ธ | Investor Relations Portal Built secure Java Spring Boot backend APIs for one of the world's largest Islamic banks. Delivered financial reporting endpoints with compliance-grade data security for institutional stakeholders. ๐‡๐จ๐ฐ ๐ˆ ๐–๐จ๐ซ๐ค ๐Ÿ”น Architecture designed before a single line of code is written ๐Ÿ”น Clean, maintainable Java with documentation built in ๐Ÿ”น Security and scalability from day one, not retrofitted later ๐Ÿ”น Full ownership from architecture through deployment ๐Ÿ”น Proactive updates and clear communication throughout I work with modern development tooling and productivity practices to maintain high output and code quality, with rigorous human review and production standards applied to every deliverable, no exceptions. ๐Ÿš€ ๐‹๐ž๐ญ'๐ฌ ๐“๐š๐ฅ๐ค ๐€๐›๐จ๐ฎ๐ญ ๐˜๐จ๐ฎ๐ซ ๐๐ซ๐จ๐ฃ๐ž๐œ๐ญ: Whether you're building a Java backend from scratch, scaling a system that's hitting its limits, or need a full-stack engineer who leads with architecture, I'm here to make it production-ready. Send me a message and let's get started.

  • Java
  • Spring Boot
  • React
  • Spring Framework
  • JavaScript
  • API Integration
  • Core Java
  • Full-Stack Development
  • Microservice
  • Hibernate
  • Jackson
  • Next.js
  • CI/CD
  • API
  • PostgreSQL
  • MySQL
  • RESTful API
  • TypeScript
  • Spring MVC
  • Docker
Shagufta N.

Wroclaw, Poland

$10/hr
4.7
115 jobs

Web, mobile and API automation expert. Fully integrated CD and CI pipeline using Jenkins, Gitlab, Codeship and other tools. I have strong experience in creating automation tests using cucumber, jbehave, serenity BDD automation framework and using all its features, like integration with Jira, running tests in parallel on Jenkins and excellent HTML reports after finishing the tests. Expert in CD and CI setup using open source application and tools help your team to achieve high quality product with in timeline. Experience using Jenkins Codeship, aws EC2, Heroku and firebase to providing the cutting edge automation testing solution. As a load test engineer, I create the custom scripts in Jmeter and then we can run those scripts on the required infrastructure. I will help you benchmarking your application. I have working experience in creating web scrapper using phantomjs/selenium and casperjs as framework. I can save the results of web crawler in txt, xls or in DB also the out put can be in JSON format so that you have integrate it with your backend code. Following are the tools and languages I am comfortable working with: 1. Java, selenium webdriver, selenium page object model 2. Javascript, phantomjs, casperjs 3. Nodejs, ES6 4. Cucumber, Serenity BDD, Jbehave 5. Jenkins, Codeship, Cloudbees 6. Firebase, Heroku, AWS EC2, S3, codedeploy 7. Jmeter, Blazemeter. We have leading protractor testing framework ready to use. It has following features. 1. Customised gulp commands to run all tests, run single scenario, run tests based on tags, provide the application url from command line. 2. Configurable with CD/CI, Browser stack, Sauce lab, Bitbar 3. Single test result page for run on different browser and devices. 4. Notification for failed step and number of test failed

  • Jenkins
  • Software Testing
  • Annotated Screenshot
  • Java
  • JavaScript
  • Selenium WebDriver
  • Cucumber
  • Apache JMeter
  • Test Strategy
  • Automated Testing
  • Selenium
  • Behavior-Driven Development
  • Unix
  • Cross Browser & Device Compatibility
  • RESTEasy
Yurii S.

Katowice, Poland

$113/hr
5.0
99 jobs

Hello there! My name is Yurii and I am a certified Google Cloud Architect and Engineer passionate in Cloud development and Java. I have more than 10 years of commercial enterprise development experience in Java working as a Senior Java Developer and leading a small but efficient team. During my career, I had developed multiple services and applications from desktop apps to huge standalone web applications and micro-service-based platforms for image processing, studying, etc. A brief summary of my expertise could be found below. Programming Languages: Java, JavaScript, TypeScript, Python Main Technologies: Java SE, Java EE, Spring, Hibernate, JSP, Servlets, AspectJ, AngularJS, Django, Flask Testing frameworks: JUnit, Mockito, Spock, Geb, Selenium, PowerMock IDE: Eclipse, NetBeans, IDEA Application servers: Tomcat, WebLogic, Glassfish, Jetty OS: Windows, UNIX DBMS: Oracle, Apache Derby, MySQL, SQLite Build Tools: Maven, Ant, ivy, gradle Version Control System: Subversion, git Management Tools: JIRA, Confluence, Gerrit, ZenHub, GitHub Additional skills: technical documentation writing, knowledge transferring CI/CD: Jenkins

  • Java
  • JavaScript
  • Python
  • DevOps
  • AWS Lambda
  • Google Cloud Platform
  • ETL Pipeline
  • Software Architecture & Design
  • API
  • Cloud Architecture
  • Cloud Computing
  • CI/CD
  • Solution Architecture Consultation
  • Cloud Engineering
Piotr K.

Poznaล„, Poland

$30/hr
4.0
24 jobs

Over the last 15 years, I have developed a wide range of applications using Java technologies. Spring / Spring Boot, Hibernate JSP, JSF, Apache Wicket, Apache Struts HTML.CSS, JavaScript, jquery, mySql, postgreSQL, Oracle. My skills are confirmed by certifications: VMWare Spring Certified Profesional OCP (Oracle Certified Professional Java SE 17) SCJP (Sun Certified Java Programmer) SCWCD (Sun Certified Web Component Developer).

  • JavaScript
  • Java
  • SQL Programming
  • Spring Framework
  • SQL
  • Apache Wicket
  • Java Servlet API
  • Jakarta Server Pages
  • Hibernate
  • PostgreSQL Programming
  • Spring Boot
  • Spring Security

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