I specialize in building secure, scalable, production-ready backend systems using Java, Spring Boot & microservices architecture for startups and enterprises. Back-end technologies: - Spring-framework, spring-security - JPA/Hibernate + Spring-Data - REST, GraphQL, and WebServices (Spring-Boot) - Apache Kafka, Camel - SQL, MySQL, PostgreSQL, MariaDB, MongoDB - Maven/Gradle/Ant Front-end technologies: - Spring-MVC, Struts - template engines: Thymeleaf, JSP/JSTL, GSP, Freemarker, Jtwig, Velocity - JQuery and Bootstrap - HTML5, CSS3, JavaScript - Angular, React SDLC - Agile and Scrum programming methodology - TDD using JUnit, Mockito, Karma (for UI) - Eclipse, STS and Intellij IDEA - Git, SVN, and CVS code repositories - Maven, Ant, and Gradle build tools - Jenkins and Bamboo CI servers - Docker, Kubernetes - Bash scripting, Server Administration Cloud - Amazon cloud deployment using EC2 - Amazon file sharing S3 - Amazon cloud database using RDS - Amazon based messaging (SNS and SQS) - Google cloud platform - Heroku based could deployment - VPS setup and administration

I am a Java Web Developer, working as freelancer, mainly in Upwork. I am very passionate with Java and JVM technologies. My experience mostly in developing Software As A Service (SaaS) platform, business computing and information system area, using Bootstrap, Angular JS or JSF as UI Components or web framework, Spring Core, Spring MVC or JBoss Seam as Restful API endpoint and or Integration framework, and Hibernate as favorite Java Persistence API (JPA) implementation wrapped by Spring Data component. If my clients requires no casual application or web server, I like to use Spring Boot for simpler development and deployment of the application. I am also interested in database design and software design. I believe that great software not only mediocre work of typing, but also comes from thoughtful process. I believe in TDD, and also believe that tests code must be written, organized as good as the source code it self and is integral part of the source code. I am a quick learner, and In my spare-time, I am writing some personal open source project and small proof-of-concept about java-related stuff in my GitHub public repository. My primary machine is linux desktop with 1TB NVMe SSD and 64GB or RAM. I have macbook pro 15 for testing purpose and to allow me mobile occasionally, if needed. Communication is important in remote work, and for this purpose I have 2 link dedicated internet connections to my workspace. If you need my detailed skill abilities, below is what I have experienced in: - Software Design, Database Design, and microservices/Micro-services/micro services architecture. - JPA 1.0, JPA 2.0, with Hibernate. - Bean Validation Specification with Hibernate Validator. - Dependency Injection with Java DI (JSR-330), Java Context and Dependency Injection for Java EE Platform (JSR-299), and Spring Core as most popular (but non-standard) Java Dependency Injection Framework. - Java Web Framework with Spring MVC and JSP, or Java Server Faces (JSF) with Facelet and Primefaces. - Spring Boot, Spring Data stack. - Generated / scaffolding web application using JHipster. - Java Web / Application server with Tomcat, Wildfly, or Websphere AS. - Logging with SLF4J as a wrapper to Log4J or Logback. - JUnit or Test NG as testing framework. - Ant, Maven or Gradle as build and dependency management tool. - HTML 5, CSS 3, JavaScript, JQuery, Twitter Bootstrap, transparency.js, and angular / angular.js - Third Party API such as Xero API, Open ERP Java API, Braintree Payment API, Stripe Payment API, and Social APIs. - Linux, Mac or Windows. - MySQL, PostgreSQL, Oracle, or Microsoft SQL Server for RDBMS. - Couchbase or Mongo DB for No-SQL solution. - Elasticsearch (ELK) stack or pentaho for data integration, advanced search, reporting and data analysis solution. Thanks, Resa

With 10+ years building Java backend systems, I deliver production-ready software end-to-end — from API design and domain logic to the pipeline and environment it runs on. Most senior Java engineers hand off deployment to someone else. I don't. When there's no DevOps engineer on the team, I cover that ground myself — setting up CI/CD pipelines, containerizing services, configuring cloud environments, and making sure what I build actually runs reliably in production. You get one engineer who takes full ownership of delivery, not a gap between dev and ops that someone else has to fill. I also integrate AI-assisted development tools into my workflow to move faster and keep costs down for clients. I work with my preferred toolset by default, but if your team has privacy or data security requirements, I'm happy to work within your approved tools or constraints — no friction. Clients typically come to me with: ✅Backend systems that need to be built right from the start — clean design, solid APIs, room to scale ✅Legacy Java codebases that need modernizing without breaking what works ✅Microservices that need to be decomposed, redesigned, or made deployable ✅Teams without a dedicated DevOps engineer who still need a proper delivery setup I work across the full backend lifecycle: design, build, containerize, automate, ship, and monitor. ➤ Backend Engineering ✅Spring Boot & Spring Cloud microservices ✅REST & GraphQL API design ✅Event-driven systems (RabbitMQ and similar) ✅Database design & optimization (SQL & NoSQL) ✅System design for scalability and maintainability ➤ Delivery & DevOps — when the team needs it ✅CI/CD pipelines (GitHub Actions, GitLab CI, Jenkins) ✅Docker & Kubernetes — containerization and orchestration ✅Infrastructure as Code (Terraform) ✅AWS & Azure — environments that support your full SDLC ✅Monitoring & observability (Prometheus, Grafana, ELK) ➤ What I Deliver ✅Well-structured backend systems your team can extend without pain ✅APIs designed for clarity, consistency, and long-term maintainability ✅Deployable, containerized services — not "works on my machine" software ✅Automated pipelines and stable environments when there's no DevOps engineer to own them ✅Production setups that are observable, cost-aware, and right-sized for your stage ✅Faster delivery and lower effort costs through AI-assisted development — with full respect for your data privacy preferences ➤ Working Style ✅I take full ownership — design decisions, delivery, and outcomes ✅Honest scope estimates, no surprises mid-project ✅I document what I build, so your team isn't dependent on me ✅Strong async collaboration across US, EU, and other time zones ➤ Industries ✅SaaS platforms & product companies ✅Startups and scale-ups ✅Enterprise engineering teams If you need a senior Java engineer who won't stop at writing code — someone who can take a feature from design to production without handing off to a specialist — let's talk. Message me and I'll review your current setup or requirements and tell you honestly what I can deliver and how. 🔑 Keywords Java, Spring Boot, Spring Cloud, Microservices, REST API, gRPC, RabbitMQ, Backend Developer, API Design, System Design, AWS, Azure, Kubernetes, Docker, Helm, Terraform, CI/CD, Bitbucket, Jenkins, Infrastructure as Code, Monitoring, Prometheus, Grafana, ELK Stack, Observability, Database Design, MySQL, MongoDB, SaaS Backend, Cloud Automation, SDLC, AI-Assisted Development, Productivity, Senior Java Developer

I am specialized in Java Spring Boot backend systems and JavaFX/Swing desktop applications. I have delivered 10+ projects for startups and small businesses, improving system performance, stability, and overall code quality while building user-friendly interfaces that teams actually enjoy using - ultimately reducing their daily workload and simplifying complex processes. My Technical Expertise: ------------------------ - Backend: Spring Boot, REST APIs, MySQL, Hibernate, Spring Security, GraphQL - Desktop: JavaFX, Swing with modern UI design principles - Frontend: React JS, Angular for full-stack projects when needed - Tools: Git, Postman, IntelliJ IDEA, Insomnia What I've Built: ------------------ - REST APIs for e-commerce platforms - Desktop apps to manage inventory easily - Blog websites with secure login and user access - Tools to show data in charts and graphs, that helped clients identify cost savings Why clients choose me: ---------------------------- I connect complex backend systems with easy-to-use interfaces. I write clean, well-organized code that’s easy to maintain later, not just quick fixes. I also explain timelines and possible issues clearly from the start. Perfect fit if you need: -------------------------- A Spring Boot API that won't break under load, a desktop application that looks modern (not like it's from 2005), or reliable maintenance for existing Java systems. Ready to discuss your project? Message me with your specific requirements and I'll outline exactly how I'd approach it.

I'm a Full Stack Developer and Java Developer with 5+ years building backend systems, software platforms, SaaS applications, web applications, and enterprise systems for clients across fintech, logistics, telecommunications, retail, healthcare, and SaaS. As a full stack developer and Java developer, I design, build, and ship production-ready software systems and platforms end-to-end architecture, backend, frontend, and deployment. On the backend, my core stack is Java, Core Java, Spring Boot, and Spring Framework, building REST APIs, microservices, and scalable software systems with Hibernate/JPA, SQL, PostgreSQL, MySQL, and MongoDB. As a Java backend developer, I've designed 120+ REST APIs and built 10+ microservice architectures for systems and platforms serving 10K to 500K+ users. I've shipped 35+ production software systems, platforms, and web applications as a full stack developer and Java developer. On the frontend, I build with React, Angular, JavaScript, and TypeScript, delivering full stack web applications and SaaS platforms where clean UI meets solid backend architecture. Whether it's a software system, an internal platform, or a customer-facing SaaS product, I work across the whole stack to make sure the system holds up in production. For infrastructure, I work with AWS, GCP, and Azure, using Docker, Kubernetes, and CI/CD pipelines to keep systems, platforms, and software reliable at scale. The software systems and platforms I've maintained as a full stack developer and Java developer have held 99.9% uptime — the result of solid monitoring, careful deployment practices, and proactive system design. Performance is something I take seriously on every platform and system I build: I've cut API response times by up to 60% and improved overall system performance by 40%+ through targeted software architecture improvements rather than costly rewrites. I've also worked extensively with enterprise-level database schemas, optimizing complex SQL queries and data models across tables with 100K+ records. Beyond Java, I also write Python, PHP, and Node.js when a software system or platform calls for it, and I've worked on .NET/C# projects too, including reviving a legacy .NET system onto currently supported frameworks. As a full stack developer, I go where the project needs me. Java is my strongest ground, but I adapt the stack to the system. Beyond hands-on development, I've led teams, mentored junior developers, and managed cross-functional projects across software systems and SaaS platforms. My clients get clear communication, fast responses, and maintainable software code that still makes sense six months later. I'm open to long-term collaborations on full stack development, Java, Spring Boot, backend systems, SaaS platforms, software systems, web applications, and microservices. If you need a full stack developer or Java developer who ships reliable software and platforms, let's talk.

As a Senior Java/AI Engineer with over 12 years of experience, I specialize in building scalable, secure, and high-performance systems using Java, Spring Boot, and Spring Security. My background spans across microservices, event-driven, and service-oriented architectures, enabling me to deliver robust, maintainable backend solutions. I have deep expertise in Kafka, RabbitMQ, and RESTful API design, combined with hands-on experience integrating AI-driven and data-centric technologies like LangChain, LangFlow, Qdrant, and OpenAI APIs — bridging traditional backend systems with modern LLM-powered workflows. I’m passionate about system design, clean architecture, and test-driven development, and thrive in Agile teams where collaboration and innovation are key. My focus is on crafting elegant, future-ready solutions that accelerate business value and enhance user experience. Driven by curiosity and continuous learning, I’m always exploring emerging technologies in AI, distributed computing, and knowledge retrieval, and applying them to create intelligent, scalable Java ecosystems.

🌟🌟🌟🌟🌟 10+ years of extensive industry experience in developing complex enterprise systems as a software engineer. A CERTIFIED DEVELOPER with proven skill in functional and object-oriented language. My professional experience includes working with prominent multinational companies/institutions, some of them are as follows: 🌟 United States - Indeed.com, a leading global job board company. 🌟 Singapore - helloPay / Lazada / Rocket Internet, the most prominent e-commerce in Singapore and South East Asia with revenue USD 1 Billion. 🌟 Malaysia - CIMB Bank, the largest bank in Malaysia and South East Asia with revenue over USD 4 Billion. 🌟 Indonesia - DANA, a joint venture with Chinese giant Ant Financial, producing the leading digital wallet in Indonesia with aggressive plans for Asia expansion. 🌟 Indonesia - Rehabilitation and Reconstruction Agency for Tsunami 2004, managing over USD 6 Billion of international aid. During my extensive professional career, I have delivered quality software for the financial industry, including banking, insurance, as well as fintech startups currently trending in Asia in the past years. I have implemented numerous features ranging from backend processes such as event messaging, automatic scheduling, SOAP, RESTful API to the frontend side where customers could place financial transactions like money transfers and bill payments. My tech stack : 🌟 Programming Language (functional and OOP): Java, Elixir, Erlang, Phyton, Go, Javascript 🌟 Frameworks: J2EE, Spring, Phoenix, React.js, Vue.js 🌟 Database: Mysql, PostgreSQL, GraphQL, MS Sequel Server, Oracle 🌟 Others: App servers, Git/Github, Jenkins, AWS, Heroku, Scrum Framework TOP 5 REASONS FOR CHOOSING ME OVER OTHER FREELANCERS : 🌟 Client-oriented. It is my core philosophy in engaging with my client. I focus 100 % on helping you meet your business goals and put your needs on top priority. 🌟 Problem-solved guarantee. All projects I was working on were 100 % successfully delivered, and I intend to do the same on the Upwork platform. I guarantee I will solve your problem provided that it is humanly possible to solve it 🙂 🌟 Huge ambition for success, and this is ONLY possible if I help you to be successful too! Giving me extra motivation to deliver your projects that exceed your expectations within the earliest time possible. 🌟 Resilience and challenge-hungry. I embrace challenges and won't stop until I solve your problems. It makes me feels extremely good whenever I solve your problems, and at the same time, I am eager to FACE AND BEAT your next problems. 🌟 Responsibility and Responsiveness. Rest assured that I am taking full responsibility to complete each task and instantly respond to any queries. And I do hope we are able to engage communicatively during projects to clarify issues or requirements whenever necessary. A snippet of the testimony below from one of my previous employers describes her impression when working with me. You can find a complete review in the portfolio section. ".... I am proud of his accomplishments, and he will be a valuable asset wherever he goes and whoever decides to hire him. Mr. Khomeini is very hardworking. I highly recommend him to any company or organization."

Java Backend and Full Stack Architect. 16,000+ verified hours on Upwork building backend systems, HL7 and FHIR healthcare integrations, SaaS platforms, and mobile apps with Java, Spring, Angular, and AWS. I have spent 10+ years designing and building production backends. My largest Upwork contracts run into the thousands of hours each: a 5,130-hour microservices and AWS backend, a 2,012-hour SaaS analytics platform, and active enterprise integration work. I go deep and I stay for the long haul. I do not just ship features. I design systems that do not break. WHAT I DO BEST Backend and architecture, my strongest area - Java, Spring Boot, Spring Security, JPA, Hibernate - Microservices and event driven systems - API design and third party integrations - Postgres, reliability and performance work - AWS architecture, Docker, CI/CD Full stack - Angular, React, Next.js, Node.js - Frontend architecture that stays clean as the app grows WHERE I HAVE DEPTH Healthcare systems and integration - HL7 v2 and FHIR R4 integrations, Mirth Connect interface engines - Health data platforms (openmhealth) - EHR and EMR data exchange, PHI handling and audit trails - Patient scheduling, remote monitoring, care management SaaS platforms - 2,012 hours on a SaaS analytics platform, plus dashboarding and reporting systems - Multi-tenant backends, subscription and access control - MVP to production builds AI, built into the systems above - OpenAI and LangChain integrations, RAG pipelines, semantic search - Document intelligence and text extraction for clinical and business data - AI Voice Agent PROOF - 16,321 hours logged on Upwork, all verified by the platform - 47 completed contracts, 100% Job Success, Top Rated Plus - $900K+ earned here - My longest single contract ran 5,130 hours. Clients keep me for years. HOW I WORK - I think in architecture first, then code - I build for the next two years, not the next two weeks - I write clearly. You will never have to guess what I meant - I own the work from planning through deployment - I flag problems early, even when the news is bad GOOD FIT IF - You need an engineer who makes architecture decisions, not just takes tickets - Your backend has to be stable, secure, and scalable - You are integrating healthcare data or building a SaaS product - You are planning for the long term NOT A FIT IF - You are shopping for the lowest rate - You want a patch, not a fix - Clean, maintainable code is not a priority for you Send me a message with your project details. I will tell you how I would approach it, and I will be honest if I am not the right person for it. Ganesh

I’m a Top-Rated (5⭐️) Full Stack Engineer with over 4+ years of experience delivering high-quality backend systems, APIs, and full-stack web applications. I specialize in Java/Kotlin with Spring Boot on the backend and Vue/Nuxt on the frontend, supported by modern DevOps and cloud-native practices. I help teams build reliable, scalable, and maintainable software systems, whether it's creating new applications from scratch or improving and refactoring existing codebases for better performance and maintainability. 🔧 My Expertise Covers 🔹 Building RESTful APIs and microservices using Spring Boot (Java/Kotlin) 🔹 Real-time web applications using WebSocket (e.g., chat, live updates) 🔹 Implementing secure authentication & SSO with OAuth 2.0 and OpenID Connect 🔹 Full-stack development with Vue.js, Nuxt.js, Tailwind CSS, and Bootstrap 🔹 Working with relational (PostgreSQL, MySQL), in-memory (Redis), and graph (Neo4j) databases 🔹 Automating CI/CD workflows using GitHub Actions and Docker 🔹 Provisioning and deploying to GCP services (Cloud Run, Cloud SQL, GCS, Cloud Tasks, Cloud Scheduler, Load Balancer) 🔹 Deploying and managing applications on Linux VPS (Ubuntu) 🚀 What I Bring 🔹 Clean, modular, and well-documented codebases 🔹 End-to-end ownership from architecture to deployment 🔹 Real-time, scalable solutions tailored to your product needs 🔹 Proactive communication and on-time delivery 🔹 Strategic insight to improve features, reliability, and scalability Whether you need a full-stack developer to take your product from idea to launch, or a backend specialist to build real-time APIs and services, I’m ready to contribute to your success. Let’s build something exceptional.

Full Stack AI SaaS Engineer | Building Cloud-Native, AI-Driven SaaS Platforms | Java/Spring Boot, LLMs, AWS & GCP, React, Next.js, Flutter I’m Shahzad, a Certified Java Architect with 10 + years of experience building scalable, high-performance SaaS applications, now focused on integrating AI and automation into modern cloud products. I’ve engineered AI-powered SaaS platforms that combine conversational intelligence, LLM pipelines, and serverless cloud infrastructure. My passion is turning complex workflows into simple, intelligent, user-friendly applications that scale globally. ------------------------------------------------ What I Build: AI-Driven SaaS Products: Multi-tenant cloud apps powered by LLMs (GPT, Claude), RAG, and custom ML APIs Conversational & Voice AI Agents: Twilio + n8n + GPT workflows for 24/7 automation (healthcare, enterprise) Data Intelligence Apps: predictive analytics, anomaly detection, recommendations, and real-time dashboards Cloud-Native Architectures: Java/Spring Boot microservices, REST/GraphQL APIs, and event-driven backends ------------------------------------------------ Core Stack: Backend & Cloud: Java (8 → 25), Spring Boot 3, AWS (Lambda, S3, RDS), GCP (BigQuery, Vertex AI), Docker, Kubernetes AI/ML: Vertex AI, OpenAI API, BigQuery ML, Python (NumPy, Pandas, Scikit-learn), RAG, LLM Integration Frontend: React, Next.js, TypeScript, Tailwind, Flutter (for cross-platform mobile apps) Integrations: Twilio, Stripe, Shopify, BigCommerce, REST/SOAP APIs, Kafka, RabbitMQ ------------------------------------------------ DevOps & Data: CI/CD pipelines with GitHub Actions & Jenkins Cloud monitoring & observability (CloudWatch, GCP Logging) SQL (PostgreSQL, MySQL) & NoSQL (MongoDB, Redis) ---------------------------------------------------- Certifications: Oracle Certified Java Programmer (2022) AWS Certified Developer – Associate (2023) Amazon Machine Learning Specialty (2023) Spring Boot 3 & Spring 6 Architect (2020) SAS Programming Essentials (2023) ------------------------------------------------ Let’s Build Something Smart: Whether you’re launching an AI-powered SaaS platform, a voice or chat agent, or a data-driven product, I can help you design and deliver a system that’s intelligent, scalable, and future-ready.