Over 14 years of solid and hands-on experience with Java, Java Enterprise Edition, and related APIs, technologies, and frameworks., Expert in conceptualizing, designing, and coding technical solutions using Java/J2EE technology stacks. • Professional Java development using Spring boot, Spring, Vert.x, Hibernate, Kafka, • Professional using JavaScript, Angular, ReactJS, HTML5, XML, CSS. • Good experience working with Perl, C++, .NET, and Python. • Professional SQL, MySQL, Oracle, DB2, and PostgreSQL, MSSQL. • Professional software development methodologies using Agile/Scrum, CI/CD pipeline • Extensive Object-Oriented Development OOP/OOD experience, Design pattern, Microservices patterns, Containers, Docker. • Extensive web services experience, Reactive, Message driven.

Aspiring Full Stack Java Developer | Builder of Scalable, Clean, and Modern Web Applications 🔹 Strong foundation in PHP, WordPress, Laravel 🔹 Built RESTful APIs using Java & Spring Boot in academic and personal projects, including a task management web app with JWT-based authentication 🔹 Practical experience with frontend technologies: HTML, CSS, JavaScript — developed responsive UIs and single-page apps 🔹 Skilled in MySQL for database design, normalization, and complex queries (e.g., built multi-table reporting modules for small business apps) 🔹 Knowledge of Microservices Architecture, Cloud Platforms (AWS EC2/S3 & Azure basics), and DevOps fundamentals (Docker, CI/CD concepts) 🔹 Enthusiastic about problem-solving, clean code, and software development best practices 🔹 Passionate about clean code, Agile practices, and collaborative development — contributed to an open-source issue on GitHub 🔹 Currently seeking an opportunity to apply my full-stack skills in a real-world team environment, grow under mentorship, and contribute to impactful projects

🚀 Technical Lead & Senior Engineer | 2,200+ Upwork Hours | 100% Job Success I don't just write code; I design clean architectures and take total technical ownership of your product. I am a Technical Lead and Senior Full-Stack Engineer with over 6 years of experience building high-performance web applications and complex API networks. With a flawless 100% Job Success Rate across 2,200+ hours on Upwork, I specialize in bridging heavy enterprise backend ecosystems with modern, intelligent automation. ⚡ Core Architecture & Integration Expertise: • 🤖 AI & LLM Integration: Embedding OpenAI, Anthropic, or Gemini APIs for secure context retrieval, automated data workflows, and intelligent feature layers. • 🔌 Custom API Architecture: Designing secure, high-throughput RESTful and GraphQL API gateways from scratch using Java (Spring Boot) and Node.js/Express. • 🔄 Resilient Third-Party Systems: Orchestrating fault-tolerant integrations with webhooks, external CRMs, and payment gateways (Stripe, PayPal) with clean failover handling. • 📊 Real-Time Streams & UI: Leveraging WebSockets for live, low-latency data dashboards built on high-performance Angular and React.js frontends. 🛠️ The Technical Toolkit: • Backend: Java, Spring Boot, Node.js, Express.js, Groovy Grails, Gradle, WebSockets • Frontend: Angular, React.js, JavaScript (ES6+), HTML5, CSS3, SASS/LESS, Bootstrap • Databases & Tools: MySQL, MongoDB, PostgreSQL, Git, Postman, Jira 💎 The Senior Standard I Bring: • Logic-UI Separation: I isolate core computations from the front-end components, ensuring your platform remains secure, stable, and effortless to scale. • AI-Native Velocity: I utilize an optimized, AI-native development workflow to build, test, and audit production-grade code at twice the speed of traditional timelines. • Product Ownership: I proactively review specifications to optimize API data costs, eliminate bottlenecks, and ensure rapid, clean delivery. If you need an autonomous Technical Lead who can take total ownership of your technical blueprint and execute flawlessly, let’s connect!

I help businesses build, scale, and modernize enterprise portal and backend solutions using Liferay DXP, Spring Boot, and Java and integrate AI capabilities that make those platforms smarter and more automated. 100% Job Success Score. Top Rated. 15 completed projects. 7,800+ hours delivered. I don't just write code. I architect solutions that last. ★★ Why Clients Choose Me ★★ ✔ End-to-end ownership from requirement analysis to deployment and maintenance ✔ Clean, modular, well-documented code built for long-term maintainability ✔ Experienced as Developer, Architect, and Team Lead in agile environments ✔ Strong communicator who keeps projects on track and clients informed ✔ Equally effective working independently or leading a team 🤖 AI & Modern Integration Clients increasingly need AI built into their existing systems not as a separate tool, but woven into their portals, workflows, and APIs. I deliver that: ✦ LLM Integration: OpenAI (GPT-4o), Claude (Anthropic), Google Gemini via REST APIs ✦ RAG Pipelines: context-aware AI assistants using LangChain, LlamaIndex, and vector databases (Pinecone, Weaviate, pgvector) ✦ AI-Powered Search: semantic search and intelligent recommendations via Elasticsearch + embeddings ✦ Workflow Automation: integrating AI into Spring Boot microservices for document processing, classification, and business automation ✦ Chatbot Development: intelligent support and internal bots for enterprise portals ✦ Prompt Engineering: production-safe, reliable prompt design for real business use cases ☕ Java / Spring Boot ✦ Spring Boot 3.x, Spring Framework 5.x, Spring Security, Spring Data JPA ✦ Microservices architecture, REST & SOAP APIs ✦ RabbitMQ, Kafka for async messaging ✦ Hibernate/JPA, Maven, Gradle ✦ Databases: MySQL, PostgreSQL, Oracle, MongoDB, Cassandra 🌐 Liferay DXP Expertise With deep hands-on experience across Liferay 5.x through 7.x/DXP, I cover the full lifecycle: ✦ Portlet, Hook, Theme, and Extension development ✦ Liferay DXP environment setup, performance tuning, and clustering ✦ SSO integration, LDAP, CAS, Keycloak ✦ Elasticsearch integration and workflow management ✦ Version migrations and upgrades (5.x → 6.x → 7.x/DXP) ✦ Payment gateway integration (Stripe, Authorize.net, BillDesk) ✦ Content management and enterprise portal solutions ☁️ DevOps & Cloud ✦ AWS (EC2, S3, Lambda, RDS) ✦ Kubernetes, Docker, Jenkins CI/CD ✦ Cloud Foundry ✦ Git, SVN. version control and branching strategies ✦ Splunk monitoring with DB Connect and Active Directory LDAP 📱 Android Development (Java & Kotlin) ✦ REST/SOAP web services, JSON/XML parsing ✦ Messaging: Twilio, XMPP, QuickBlox, OpenFire ✦ Social integrations: Spotify, Facebook, Instagram, SoundCloud ✦ Maps: Google Maps, Mapbox, GPS ✦ Payments: Stripe, Authorize.net, BillDesk 🛠 Full Tech Stack Languages: Java, Kotlin, JavaScript, TypeScript Frameworks: Spring Boot, Hibernate, React.js, Angular AI/ML: LangChain, OpenAI API, Claude API, vector databases, RAG pipelines Cloud: AWS, Kubernetes, Jenkins, Cloud Foundry Databases: MySQL, PostgreSQL, Oracle, MongoDB, Cassandra Tools: Git, Maven, Gradle, Eclipse, JIRA 📌 Notable Projects ✦ Built a music social network with stories, followers, and deep API integrations Spotify, Apple Music, YouTube, Facebook, Instagram ✦ Led a cross-functional agile team across native and backend development, reporting directly to product executives ✦ Architected and delivered enterprise portal solutions for large organizations on Liferay DXP ✦ Implemented Splunk enterprise monitoring with DB Connect and Active Directory LDAP ✦ Delivered full-stack AI integration projects connecting LLMs to existing Java/Spring Boot backends Let's talk about your project. Whether you need a robust backend API, a Liferay portal built or migrated, or an AI feature integrated into your existing system, I deliver on time, with clear communication throughout. Message me and let's get started.

Experienced software engineer with over 15 years in backend development and software architecture. Proficient in Java and Java Spring Boot for building microservices, with strong experience in team leadership, project management, and system architecture. Focused on clean, readable, reusable, and maintainable code following SOLID principles. Continuously learning and exploring new technologies to improve solutions and processes. Worked with Fintech, E-commerce, High performance betting platforms. Exploring Spring-AI. Key Skills • Technical Analysis and Requirement Analysis. • Team management and fostering a healthy team culture. • Backend Development (Java, Spring Boot, Microservices) • Code Reviews and Software Development Best Practices. • Problem Solving and System Design. Technologies Languages: Languages: Java, JavaScript, C++, SQL Frameworks: Spring Boot, React Databases: PostgreSQL, MySQL, MongoDB Caching: Redis, In memory cache Message Queues: RabbitMQ Version Control: Git, SVN Project Management: Jira, Trello Current Role: Lead Engineer, Incognito Solutions Ltd, Dhaka, Bangladesh (June, 2024 – Present) Leading a specialized development team of 5 Java developers and 2 frontend developers, overseeing the full software development lifecycle from business requirement analysis to solution design and implementation. Responsible for architectural decisions and technical direction for custom software solutions, specializing in gaming and betting platform development. **Key Responsibilities:** • Drive technical strategy and architecture decisions for complex software projects • Lead backend development using Java Spring Boot and microservices architecture • Oversee frontend integration with React and Next.js frameworks • Conduct code reviews and enforce best practices to maintain high-quality codebase • Collaborate with clients to understand business requirements and translate them into technical specifications • Mentor junior developers and foster a culture of continuous learning and innovation **Key Achievements:** • Successfully led the development of ds.lavender-777.com, delivering a comprehensive betting platform with gaming integration • Implemented RabbitMQ as a pub-sub messaging system across three key services (Accounting, Reward, Settlement), enhancing system reliability and performance • Pioneered the adoption of Java 21 with virtual threads, significantly improving system concurrency and performance • Optimized resource utilization through parallel processing techniques, reduced API response times. • Established coding standards and review processes that improved code quality and reduced production issues.

Hello! I'm Jalal, a passionate and seasoned Android App Developer with over 5 years of hands-on experience in creating innovative, user-centric mobile applications. My expertise lies in leveraging Kotlin and Java to build robust, scalable, and efficient apps that not only meet but exceed client expectations. Comprehensive Experience - Developed and deployed 10+ Android apps across various domains including e-commerce, finance, healthcare, entertainment and phone diagnostics. Technical Proficiency - Expert in Kotlin and Java, with extensive knowledge of Android SDK, Jetpack components, and modern architectural patterns like MVP, MVC, MVVM and MVI. UI/UX Focused - Strong eye for design and usability, ensuring that each app delivers an intuitive and engaging user experience. API Integration - Proficient in RESTful API and third-party library integration (Retrofit, Glide, Firebase, Google Map, Mapbox, FFMPEG and other libraries). Performance Optimization - Skilled in optimizing app performance and memory usage, ensuring smooth and fast user interactions. Quality Assurance - Committed to maintaining high code quality through rigorous testing and adherence to best practices. What I Can Offer Custom Android App Development: Tailored solutions to bring your unique app ideas to life, from concept to deployment. Maintenance & Upgrades: Ongoing support to keep your app updated with the latest features and improvements. Code Review & Optimization: Detailed analysis and enhancement of existing codebases to boost performance and maintainability. Bug Fixing & Troubleshooting: Quick and effective resolution of any issues to ensure your app runs flawlessly. Notable Projects: E-commerce Platform: Developed a feature-rich shopping app with real-time inventory updates, secure payment gateway integration, and personalized recommendations. Project names are Vital Sales Pro, Sufi Sales Pro. Healthcare App: Created a comprehensive health tracking application that includes appointment scheduling, medication reminders, and telehealth services. Project names are AlphaCare, Inteli-Health, Family Doc. Diagnostics App: Created a robust, smart and user friendly phone diagnostic app. Which helps the client to diagnose the mobile phone in minutes and ensure that all the components like Speakers, Microphones, Sensors, Storage and other functionalities are working perfectly. Project names are PhoneCheck, DeviceWork & MoboCheck. Core Skills - My core skill set includes Kotlin, Java, Android SDK, Jetpack Compose, MVP, MVC, MVVM, MVI, RESTful APIs, Firebase, Retrofit, Glide, Dagger2, Hilt, UI/UX Design, Performance Optimization, Quality Assurance. Availability: I am available for Full-Time, Part-Time and Project Based. Let's Connect: I am dedicated to helping you achieve your app development goals. Let's discuss how I can bring your project to life with precision and excellence. Feel free to reach out, and let's get started on your next successful Android app!

The two-second version: I'm an Atlassian Solutions Expert and Full Stack Developer with 11+ years turning complex Jira and Confluence chaos into clean, scalable operations, for everyone from scrappy startups to Fortune 50 giants. 👋 The longer, sit-down version: Great to meet you! I'm Saurabh Gupta. Most of my long-term clients come back to me for one simple reason: I make the complicated feel manageable. Whether that's a sprawling Jira architecture serving 50,000+ users, a Confluence migration pushing past 1TB, or a custom Forge app built from scratch. I've done it, and I've done it without keeping anyone up at night. Over the past decade, I've had the privilege of working deep inside some genuinely challenging environments. Among them: - Enterprise financial institutions (BNY Mellon, Bank of America, Bloomberg) - Fortune 50 and Fortune 500 companies navigating compliance and scale - Fast-growing startups that needed a solid Atlassian foundation from day one - Regulated industries where accessibility and 508 compliance weren't optional One project I'm particularly proud of: I architected a centralized vulnerability data warehouse for BNY Mellon that slashed security reporting cycles from over a week down to under two hours, powered by RabbitMQ for async messaging and custom Java fork-join pools for large-scale data processing. That kind of result, real, measurable and business-changing, is what I'm here for. What makes my work a little different from most Atlassian consultants: I don't just configure your tools, I build inside them. I develop custom Atlassian Forge apps, Java-based plugins, and Marketplace-ready add-ons, which means when your off-the-shelf options run out, I'm just getting started. That rare combination of deep Atlassian administration and full-stack engineering (Forge, Java, RabbitMQ, React, Node.js) is what lets me solve problems others simply hand back. When you work with me, here's what you get: - A partner who listens first and builds second - Solutions that are clean, documented, and built to last (not duct-taped together) - Honest timelines, no surprises, and clear communication throughout Deep expertise across Jira, Confluence, Jira Service Management, Forge app development, Java plugin engineering, automation, migrations, and compliance I also founded Vamhi, where I've published several Atlassian Marketplace plugins. So I understand your ecosystem not just as an admin, but as a builder who has shipped production-grade tools into it and knows exactly what it takes to get them there. My aim is always long-term partnerships. The kind where you stop worrying about your Atlassian environment because you know it's in good hands. If that sounds like what you're looking for, I'd genuinely love to connect. Drop me a message, even if your situation doesn't fit neatly into a category above. Complex and unusual is honestly where I do my best work. Cheers, Saurabh P.S. If you're dealing with a gnarly migration, a compliance deadline, a Forge app you need built right, or an automation problem that has stumped everyone else, those are my favorite kinds of conversations. Don't hesitate to reach out.

Highly Skilled Web Developer | 5 Years of Experience | Competitive Rates Greetings! With 5 years of experience in web development, I have an extensive track record of working on diverse projects as both an individual contributor and a valuable team member. I specialize in developing complex enterprise applications using Java, utilizing a comprehensive technology stack to deliver exceptional results. 🎓 Specialization Highlights: 🎓 ✅ Spring Framework: Proficient in Spring Core, Spring MVC, Spring Security, and Spring Boot. ✅ Data Management: Skilled in Spring Data-Cloud, Hibernate, JPA 1.2, and working with SQL databases like PostgreSQL and MySQL. ✅ Restful API Development: Experienced in building robust and scalable APIs. ✅ Build Tools: Proficient in Maven for efficient project management. ✅ Web Technologies: Expertise in Web-Sockets, HTML, CSS, JavaScript, Bootstrap, and a bit of React and Thymeleaf. ✅ Java Web Development: Skilled in Servlets, JSP, JSF 2.2 with Primefaces 8, Primefaces 8 Themes and Templates, and JavaFX. ✅ Software Engineering Principles: Proficient in OOP concepts and Design Patterns. ✅ Messaging Systems: Familiar with JMS, ActiveMQ, RabbitMQ, and Apache Kafka. ✅ Thorough Testing: Skilled in unit and integration testing methodologies. ✅ Database Expertise: Proficient in MySQL, PostgreSQL, and MongoDB. ✅ DevOps (AWS Practitioners), CICD Piplines, AWS CodCommit, AWS Deploy ✅ GitHub, Jenkins ✅Kubernetes (Kubectl, AWS eksctl) I thrive in a team-oriented environment and have a strong affinity for Agile and Scrum methodologies. Collaboration is key to delivering exceptional results, and I ensure seamless teamwork throughout the development process. My dedication to staying up-to-date with emerging technologies enables me to consistently deliver cutting-edge solutions. Let's join forces to bring your projects to life and achieve outstanding outcomes. The Client Review below which you will find in my reviews section ,describe the quality of work and value can expect from working with me: "Sajjad is a very nice guy willing to work and also learn in the process if it is needed. He delivered the job properly and he is also willing to help me afterwards if there are any problems in the future with the project. He has good communication and I enjoyed to work with him"

Greetings! I'm a senior web developer and certified java programmer with 20+ years of experience incorporating user and business requirements into cost-effective, secure and user-friendly solutions. I have a strong background in IT, Manufacturing & Business Process Automation, Neural Networks. I'm currently focused on full-stack software development, building projects from ground up. Technology Summary Java, J2EE, JavaScript, HTML5, Node.js, MongoDB, SQL, Linux, AWS, C++, Rust, AngularJS, React

I'm a Full-Stack Java Developer with over 8+ years of industry experience. I excel in all aspects of Java application development, from design and development to deployment. I have a proven track record of building robust and Scalable applications across diverse domains. My Expertise Full-Stack Development: Java: Core Java, multithreading, OOP, Spring, Hibernate, Struts, J2EE. Frameworks & Libraries: Spring, Hibernate, JavaFX, Apache Struts. Microservices Architecture: Spring Cloud, Netflix OSS, service discovery, load balancing, tolerance mechanisms. Web Development: JSP, Servlets, RESTful APIs, Angular, React, HTML, CSS, JavaScript. Databases: MySQL, PostgreSQL, MongoDB, Redis. Testing & Debugging: JUnit, Mockito. I also use GitHub Copilot and Claude Code to deliver the best solutions. ✔ LLM integrations (OpenAI, Claude, etc.) ✔ AI-assisted workflow automation ✔ Prompt engineering & optimization ✔ RAG based enterprise search solutions ✔ AI code acceleration using tools like Cursor ✔ Designing AI-ready Microservices architecture Java Solution Architect: Designing scalable solutions with Java, Spring, Hibernate, and microservices. DevOps: Cloud setup, infrastructure management, CI/CD. Proficient in AWS (Lambda, EC2, S3, Redshift, SageMaker, Cognito) and GCP (VMs, Google cloud storage). Domain Experience: Insurance, finance, healthcare, e-learning, e-commerce, travel, real estate, logistics, supply chain, social networking, and education. CRM and ERP systems.