Hire the Best Enterprise JavaBeans (EJB) Specialists in Karachi, PK

Experienced in Spring Boot, Core Java, thymeleaf Engineer with devops task offered having 3+ years of experience. I have previously launched many sized Spring Projects that push innovation forward, helping people and businesses growth. I do also work on Back-End, Front-End and readiness of whole Database system. Java, Spring Boot, AWS Cloud, Spring Data, Hibernate, JPA, Spring Security, Spring MVC, Microservice, Java Server Page, iReport, JasperStudio, JasperReports, Apache POI, Log4js, Thymeleaf, Maven, REST API, Lambda AWS - Manage EC2, Amazon RDS, AWS Lambda, AWS Deployment Platform - Windows (8,10,11), Ubuntu, Mac OS Database - MySQL, PostgreSQL, Oracle Server - Nginx, Tomcat, Serverless Lambda Other - Git, Maven, JavaScript, jQuery, BootStrap, Jira, BitBucket Why choose me: • Affordable price • 100% client's satisfaction • The highest quality of work • Best communication with clients • Flexible time for client I will ensure my enthusiasm for your project to make it a great success and deliver work within deadline providing extra effort. ________________________________________ 🔧 Core Strengths • End-to-end software development: backend services, APIs, and system integration • Multi-language expertise: Java, C#, C++, C, PHP • Enterprise application development: ERP, POS, E-commerce, and internal business systems • API & backend architectures: RESTful services, microservices, and layered architectures • Database design & optimization: SQL-based and NoSQL systems • Performance tuning, debugging, and legacy system modernization • Clean Architecture, SOLID principles, design patterns, and best practices • Agile development, cross-team collaboration, and technical ownership ________________________________________ 🛠 Technical Expertise (Concise) • Languages & Frameworks: Java (Spring, Spring Boot), C#, .NET Core / ASP.NET, C++, C, PHP (Laravel), JavaScript • Backend & APIs: REST APIs, MVC, Microservices, Authentication & Authorization • Databases: SQL Server, MySQL, PostgreSQL, Oracle, SQLite, Hibernate, Entity Framework • Systems & Tools: Git, CI/CD pipelines, Docker (basic), Linux, Windows • Frontend (Working Knowledge): HTML, CSS, JavaScript, Bootstrap, basic SPA integration ________________________________________ 📈 Leadership & Delivery • Lead and contribute to feature delivery in Agile/Scrum teams • Perform code reviews and mentor junior developers • Refactor and modernize legacy systems for performance and maintainability • Collaborate with QA, product managers, and stakeholders to deliver high-quality releases • Troubleshoot complex production issues and ensure system stability ________________________________________ 🎯 What I Offer Employers / Clients • Rapid conversion of requirements into clean, scalable, and maintainable solutions • Strong problem-solving skills with a focus on performance and reliability • Ownership across design, development, deployment, and support • Clear communication and ability to explain technical concepts to non-technical stakeholders ________________________________________ 🔑 Keywords Java Developer, Spring Boot Developer, .NET Developer, ASP.NET Core Developer, C++ Developer, C Developer, PHP Developer, Backend Developer, Full Stack Developer, REST API Developer, Software Engineer

I’m a Senior Java Backend Engineer with 5+ years of experience building secure, scalable, and enterprise-grade applications across telecom, FinTech, banking, insurance, and eCommerce. My core expertise is Java, Spring Boot, microservices, REST APIs, event-driven architecture, payment integrations, and cloud-native deployment. I can help you design a new backend, modernize an existing system, integrate third-party services, resolve production issues, or improve application performance and reliability. Key areas I can support: • Java and Spring Boot backend development • Microservices architecture and API Gateway implementation • REST and SOAP API development and integration • Payment gateway, wallet, DCB, and callback integrations • Kafka-based event-driven systems and KRaft clusters • Spring Security, JWT, OAuth2, and Okta authentication • Redis caching and custom Spring Cache strategies • CQRS and high-concurrency transaction processing • PostgreSQL, MySQL, MSSQL, MongoDB, Hibernate, and JPA • Docker, OpenShift, Kubernetes, Jenkins, and CI/CD • Unit and integration testing with JUnit and Mockito • Debugging, refactoring, performance optimization, and production support At Jazz, I developed the core backend of the FikrFree insurance mobile application using Spring Boot and microservices. My work included insurance-partner and VAS integrations, WSO2 APIs, payment workflows, callback processing, authentication, Redis caching, Kafka, and containerized deployment. I integrated Jazz DCB, JazzCash, EasyPaisa, and debit/credit card payment services. I also designed JazzFlix, an adaptive video-streaming platform using Spring Boot, Kafka, MinIO, PostgreSQL, FFmpeg, MP4Box, and MPEG-DASH. Previously, I worked on Temenos T24 core-banking applications, HCL Commerce B2B/B2C platforms, distributed Spring Boot systems, real-time applications, automated testing, and CI/CD pipelines. I hold a BS in Computer Science from Sukkur IBA University, completed through a fully funded OGDCL scholarship. I value clear communication, maintainable code, realistic estimates, and dependable delivery. If you need a Java engineer who can understand both business requirements and complex backend architecture, let’s discuss your project.

Having 10+ Years of experience as a Full-Stack Java/J2EE Web Developer with diversified exposure in analysis, design, development and implementation of web-based applications. Extensive knowledge of Java SE including Collection, Threading and Core Java. Good experience on Java EE technologies such as Servlet, JDBC, JSP, JSTL and JNDI. Strong programming skills in designing and implementing multi-tier applications using web-based technologies like Spring MVC and Spring Boot. Strong knowledge of Microservice Architecture using Spring Boot and Spring Cloud. Excellent knowledge of Spring Core such as Dependency Injection, Annotations and XML based Configurations. Hands-on experience with Spring AOP using Advice, Aspects and AOP Processor. Extensively worked on Spring JDBC, Spring Hibernate ORM and JPA. Proficient at designing dynamic web applications using HTML5, CSS3, JavaScript, jQuery, AJAX, JSON with responsive web applications using Bootstrap. Strong knowledge of Angular practices in commonly used modules and creating reusable Components, Pipes and Services. Strong experience using MAVEN Build System. Experienced working with technologies such as Log4j, and I18N. Good experience in developing applications with SOAP and RESTFul Web Services. Proficient at design, developing of web-based applications using Apache Tomcat 7.0/8.0/8.5, GlassFish 4.0. Good Knowledge of Amazon Web Service (AWS) EC2, SQS, SNS, Lambda Expert at handling Unit Testing using JUnit, Jasmine, and Karma. Expertise in database technologies such as MySQL 5.6/5.7, Oracle 10g/11g/12c, MS-SQL 12. Experienced in version control tools like GIT and ticket tracking platforms like JIRA. Expertise in project documentation such as E-R Diagram, UML modeling. Experience working on Software Development Life Cycle (SDLC) with a blend of proficiency and leadership in AGILE-SCRUM. Good technical abilities and skills developed by determining work ethic and self-learning.

🥇 Among on Top #5 Java freelancers UpWork. 🏆 Jobs 100% succeed. ✅ Upwork Skills Certification - Java Developer. UpWork Availability 24/7 Message me anytime. 👋 I guarantee you 100% satisfaction with your work, task, project, or any assistance required. I only take on tasks or projects that align with my skills, ensuring the best outcomes for you. Feel free to interview me first before assigning any project—I don’t charge any consultancy fees; it’s completely free. If you’re a company or need someone for long-term work, don’t hesitate to contact me. I guarantee there will be no issues from my side, whether it’s Java or Spring Boot-related. I have 10 years of experience and have worked with multinational companies, gaining extensive knowledge and expertise. ⚡My past experience with multinational corporations - 1. Madinapps (USA) 100% Succeed. 2. Pairdesk (CANADA) 100% Succeed. 3. Hashtag (UKRAINE) 100% Succeed. ⏱️ My working Hours. ET - 9:30AM TO 4:00PM. PT - 9:30AM TO 2:00PM CT - 11:00AM TO 3:00PM 🎯 My Expertise: 10+ Years of experience in Full-Stack Java Developer✔ Java backend development - Spring Framework - Rest API's Javascript, Angular 2, React based Web front-ends Android Native Mobile Apps Development using Java and Kotlin Test Automation Work in Agile methodologies 🎯 Backend Technologies • Java (jdk8 jdk11 jdk 17) ✔ • Microservices ✔ • RestAPI ✔ • Reactive Spring ✔ • SpringFrameWork (SpringBoot, Spring Security, Spring AOP) ✔ • Spring JPA (Hibernate) ✔ • Junit Mockito ✔ • Kafka ✔ • MySQL, Oracle ✔ • Java Fx ✔ • Java2EE ✔ Frontend & JS • React.js • Angular 2/4 • Vue.js • Angular Js • JavaScript • JQuery • HTML • CSS3

I'm a Principal Software Engineer with over 10 years of experience building backend applications using Java and Spring Boot. Most of my work has been on enterprise products where reliability, scalability, and clean architecture matter more than simply getting features delivered. I've designed and developed microservices, REST APIs, authentication systems, and event-driven applications for industries including retail, logistics, construction, identity management, and enterprise SaaS. I enjoy working on complex backend problems, whether it's designing a new service, improving an existing system, or troubleshooting production issues. My core expertise includes: • Java (8, 11, 17, 21) • Spring Boot, Spring Security, Spring Data JPA • Microservices Architecture • REST APIs and third-party integrations • PostgreSQL, MongoDB, MySQL, Redis • Kafka and asynchronous messaging • Docker, Kubernetes • AWS (EC2, S3, RDS, IAM) • Keycloak and OAuth2/JWT authentication • GitHub Actions, GitLab CI/CD • Performance optimization and production support Over the years I've worked on systems serving thousands of users where stability, security, and maintainability were critical. My approach is to understand the business problem first and then build solutions that are easy to maintain and scale. I also have extensive experience reviewing code, mentoring developers, improving application performance, and resolving production issues. Whether it's optimizing database queries, reducing API response times, refactoring legacy code, or designing a new microservice, I focus on delivering solutions that work well in production. If you're looking for someone who can contribute beyond writing code, communicate clearly, and take ownership of backend development from design through deployment, I'd be happy to discuss your project.

Experienced Java Fullstack Developer proficient in, Angular, Spring, BootStrap,Angular.js , Aws, Agile JAVA, J2EE, SQL, Web service SOAP/REST, Elastic Search, JUnit Test cases, HTML, CSS, JavaScript, and JQuery, Java, Hibernate, Java Fx, Java2EE, Java SpringFrameWork, Java SpringBoot JavaScript,JQuery,HTML,CSS3,Angular Js,Angular 2/4,React js Greetings! With over 11 years of experience in the dynamic world of software development, I am your dedicated partner for innovative, Agile-driven solutions. My comprehensive skill set spans multiple domains, from Java technologies to frontend development, ensuring your project's success with a holistic approach. Key Skills: Advanced Technical Skills: My extensive experience ensures I'm well-equipped to tackle even the most complex technical challenges. Innovative Solutions: I have a knack for suggesting innovative solutions, guaranteeing fresh perspectives in problem-solving. Agile Methodologies: I'm well-versed in Agile methodologies, ensuring efficient project management and rapid iterations. Test-Driven Development: I prioritize quality through Test-Driven Development, delivering robust and reliable software. Design Patterns: Proficient in applying design patterns, I create scalable and maintainable code structures. Java Stack: My expertise extends to Java, J2EE, and Spring technologies, including Spring Boot, Hibernate, and JavaFX. RESTful & SOAP Web Services: I'm adept at building RESTful and SOAP web services, facilitating seamless communication in your applications. Frontend Mastery: With HTML, CSS, JavaScript, and JQuery, I craft engaging and responsive user interfaces. Frameworks: Java Frameworks: My experience covers a range of Java frameworks, including Spring, Hibernate, and JavaFX. Frontend Development: I have a strong background in Angular, HTML, CSS, and JavaScript, allowing me to design user-friendly, interactive web applications. Technologies: Databases: Proficient in MySQL and Postgres, I handle data storage and retrieval effectively. Elasticsearch, Cassandra, and Solr: My knowledge of these data storage and search technologies ensures optimal data management and retrieval. API Automation: I can automate API testing, enhancing the reliability and stability of your applications. DevOps: Skilled in Docker, GitHub Actions, CI/CD pipelines, GitHub, Bitbucket, and GitLab, I ensure a smooth development and deployment process.