I help businesses build scalable, secure, and production-ready backend systems using Java, Spring Boot, Microservices, Kubernetes, AWS, and AI-powered integrations. With 10+ years of experience as a Principal Software Engineer and Software Architect, I specialize in designing high-performance enterprise applications, secure APIs, cloud-native systems, and distributed microservices architectures. Most applications don’t fail because of features, they fail because the backend cannot scale, integrations become unstable, deployments are difficult, or systems become hard to maintain. That’s where I can help. 💼 What I Can Help You With ✔️ Spring Boot & Microservices Architecture ✔️ REST & SOAP API Development and Integrations ✔️ Kubernetes & Docker-based Deployments ✔️ AWS Cloud Deployments & Backend Infrastructure ✔️ Secure Authentication & Spring Security ✔️ PKI & Digital Signature Solutions ✔️ AI-powered Integrations & Automation ✔️ System Refactoring & Performance Optimization ✔️ Enterprise Workflow Automation ✔️ Scalable Distributed Systems Design ⚙️ Backend & Cloud Expertise 🔹 Java, J2EE, Spring Boot, Spring MVC 🔹 Spring Security, Hibernate, JPA 🔹 Microservices & Distributed Systems 🔹 Docker & Kubernetes 🔹 AWS Cloud Deployments 🔹 CI/CD Concepts & Backend Automation 🔹 SQL Server & Database Optimization 🔹 REST APIs & SOAP Services 🔹 React JS & Angular (Full-stack support when needed) 🤖 AI & Modern Systems 🔹 AI-powered workflow integrations 🔹 OpenAI/API-based intelligent automation 🔹 AI-assisted backend systems 🔹 Secure AI integrations for enterprise applications 🔹 Scalable AI-enabled microservices architectures 🔐 Security & Enterprise Systems 🔹 PKI-based Digital Signature Systems 🔹 Authentication & Authorization Flows 🔹 Enterprise-grade secure APIs 🔹 Role-based access systems 🔹 Secure transaction processing 💡 Why Clients Work With Me ✔️ 10+ years of real enterprise experience ✔️ Strong architecture and problem-solving skills ✔️ Focus on scalable and maintainable solutions ✔️ Production-ready code quality ✔️ Clear communication and ownership mindset If you need someone who can quickly understand complex systems and deliver reliable backend solutions with modern cloud and AI integrations, I’d be happy to help.

Senior Java Backend Developer with 10+ years building production systems using Spring Boot, REST APIs, and enterprise databases. CORE EXPERTISE: - Spring Boot, Spring MVC, Spring Data JPA, Spring Security - RESTful API design and development - Database design: MySQL, Oracle - Enterprise system integration - Production support and troubleshooting WHAT I DELIVER: - Spring Boot Enterprise applications and RESTful APIs - Database design and optimization (PostgreSQL, MySQL, Oracle) - System integrations and workflow engines - Application support and troubleshooting RECENT HIGHLIGHTS: - Built configurable workflow engine processing thousands of events - Designed multi-system integrations with comprehensive error handling - Kotlin + Spring Boot experience TECHNICAL SKILLS: Java, Spring Boot, Spring Framework, Kotlin, REST APIs, PostgreSQL, MySQL, AWS, Docker, Git, Agile/Scrum MICROSERVICES KNOWLEDGE: - Strong understanding of microservices architecture patterns through coursework and demo projects. Seeking opportunities to apply this knowledge in production environments and build distributed systems expertise under experienced architects. I have a 5.0 Upwork rating and clients describe me as "professional, responsive, and genuinely committed to delivering high-quality work." Available for long-term contracts (30+ hours/week).

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

🌟🌟🌟🌟🌟 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."

👋 Hi there! I’m an experienced Full-Stack Engineer / Senior Java Developer / Team Lead with over 10 years of hands-on experience building scalable web and mobile applications across multiple domains, including ✔️ e-commerce, ✔️ FinTech, ✔️ SaaS, and more. Let`s move faster to your goals with my ready-to-go integrations: 🚀 AI: ChatGPT, Llama, Mistral, etc. - business flow acceleration & facilitation 🚀 Eleven Labs - voice recognition, voice-to-text AI 🚀 Stripe card transfers 🚀 ChatGPT AI - text, AI-generated images 🚀 Machine vision - AI for images 🚀 Zoom - voice and video calls My Specialization: ✅ Java experience 10 years: Widely utilizing recent Java features, including Lambdas, Stream APIs, DateTime APIs, and Functional Interfaces. ✅ Frontend: JavaScript, Node.js, TypeScript, Vue.js. ✅ AI integration, Computer vision, LLM training. ✅ Java EE: RESTful Services, SOAP Services, JPA, Hibernate, API Integration etc. ✅ Spring experience 10 years: Spring Core, Spring Boot, Spring Data, Spring Cloud, etc. ✅ Other "frameworks": Keycloak authorization, JHipster, Swagger, Liquibase, Axon, Vaadin ✅ SQL Databases experience over 10 years: PostgreSQL, MySQL, MariaDB, Oracle ✅ NoSQL Databases: MongoDB, Redis, Hazelcast ✅ Message Broker: Kafka and Zookeeper ✅ Firebase messaging ✅ Message Queues: ActiveMQ & RabbitMQ. ✅ ELK: logstash, elasticsearch, kibana ✅ Testing: JUnit, Spring Test, Mockito, Integration Test, Unit Test. ✅ Versioning: GIT, GitHub, BitBucket, GitLab etc ✅ DevOps: Jenkins, Docker, Kubernetes, CI/CD ✅ Hands-on design, development, implementation, and optimization of the application. ✅ Apply software engineering best practices incl. design review, code review, and refactoring. ✅ Experienced with the full Software development life cycle (SDLC) including gathering requirements, development (design, coding, debugging), testing & deployment I’m excited to contribute and help drive maximum impact for your project 🚀

Java software engineer with 7+ years of experience. I have a deep understanding of core Java components (such as multithreading, persistence, concurrency etc), advanced knowledge of Object Oriented Programming concepts and Object-Oriented Design principles. Adept at learning new skills rapidly. Skills • Java SE and J2EE; • Object Oriented Programming concepts; • Design Patterns(Singleton, Factory Method, Abstract Factory, Strategy, Iterator ...) • Spring, Spring Boot, JPA, Hibernate; • Experience in designing a MySQL and Postgres databases; • NoSQL, GraphQL • AWS, Azure, Jenkins • Maven, Gradle • Version controls: Git; • HTML, CSS, LESS; • JavaScript; • Bootstrap, JQuery, Node.js, EJS; • AJAX; Languages English – Upper intermediate; Work history Feb 2022 – Present Java Backend developer 9bits • Implemented backend services in a rental agency that ensure a sound and scalable system. • Designed and implemented various database solutions, enhancing data consistency and query performance. • Streamlined deployment pipelines using Bitbucket, improving CI/CD automation and development workflow. Technologies: Java - Spring Boot - REST - MySQL - Azure - Docker - Bitbucket Nov 2020 – Feb 2022 Java Backend developer Urgently • Developed the backend for a roadside assistance service, ensuring high availability and reliability • Microservices-based architecture put into place to raise the modularity and scalability of the system • Created automated CI/CD pipelines via Jenkins and Bamboo Technologies: Java - Spring Boot - Microservices - MySQL - GraphQL - Flyway - Jenkins - AWS Aug 2019 – Sep 2020 Software developer Workmovr • Delivered and maintained multiple commercial projects (websites for hospitals, shipping applications etc) • Integrated external APIs and ensured smooth data flow between services • Configured and managed deployment pipelines with Docker and AWS Technologies: Java - Spring Boot - Node.js - PostgreSQL - MongoDB - AWS Feb 2018 – Jul 2019 Java Backend Developer Iqualif • Tasked with the developing system for parsing White and Yellow Pages, Instagram poster, etc • Designed the architecture of the entire application Technologies: Java - Spring - REST - MySQL Personal qualities • Purposefulness; • Persistence; • Sociability;

Hello! I’m Senior developer with over 10 years of professional experience building enterprise-grade applications, RESTful microservices, and cloud-native solutions. I have successfully delivered projects for clients across Europe, the UK, Australia, India, South Africa, and the USA. ✅ Languages: Java (8–21), Kotlin, Groovy, Python, Node.js, TypeScript ✅ Back-End: Spring Boot, Spring Cloud, Spring Security, Micronaut, Camel, Express.js, NestJs ✅ Front-End: Angular, Vue.js, Nuxt, HTMX, Tailwind CSS, Bootstrap ✅ Databases: PostgreSQL, MySQL, Oracle, MongoDB, Redis, DynamoDB ✅ Cloud & DevOps: AWS, CDK, Cloudformation, ECS, API Gateway, Lambda, Cognito, DynamoDB, Azure, Docker, Kubernetes, Terraform, Jenkins, GitHub Actions, Cloudflare ✅ Architecture: Clean Architecture, Hexagonal, Domain-Driven Design DDD, Microservices, Monolith ✅ Messaging: Kafka, RabbitMQ, ActiveMQ, Artemis ✅ Monitoring: Grafana, Kibana, Datadog ✅ APIs: REST, SOAP, gRPC, GraphQL, Websocket, SSE, tPRC ✅ Build & Tooling: Maven, Gradle, Flyway, Liquibase ✅ Other: Hibernate, JPA, Elasticsearch, Jhipster, Gen Ai, Agentic Ai, Hermes Agent ✅ Opensource contribution to popular opensource projects like FlowiseAi, AWS PDK, Mongock, Jhipster lite and Jhipster Main generator. You can confidently entrust me with your project, and you will not be let down by our collaboration. I assure you of my strong sense of responsibility and the high standard of the work I deliver, which you can rely on once I become part of your team.

I build production-grade Java backend systems and own the full infrastructure pipeline, from Spring Boot microservices and Spring MVC enterprise systems to Kubernetes clusters on AWS, CI/CD automation, and GPU-powered AI/ML deployments. With 12 years of experience across FinTech, banking, and enterprise SaaS, a 100% Job Success Score, consistent 5★ feedback from clients and 13,000+ hours delivered. I ship systems that scale, perform, and stay online. What makes me different: I don't hand off code and disappear. I architect, build, containerize, deploy, monitor, and optimize across the full stack. One Senior Engineer covering both development and DevOps/MLOps. You don't need two hires. ⚙️ 𝐉𝐚𝐯𝐚 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 & 𝐒𝐩𝐫𝐢𝐧𝐠 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Java 17+ / Java EE, Spring Boot, Spring MVC, Spring Cloud, Spring Security, Hibernate Microservices architecture, event-driven systems (Kafka, RabbitMQ), REST & SOAP APIs JWT / OAuth2 / RBAC security, JSON API design PostgreSQL, MySQL, Oracle, MongoDB, Redis, Derby, EhCache JUnit testing, performance tuning, advanced query optimization Vue3, React — full-stack frontend integration for end-to-end delivery ☁️ 𝐂𝐥𝐨𝐮𝐝, 𝐃𝐞𝐯𝐎𝐩𝐬 & 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 AWS: EC2, ECS Fargate, RDS, S3, Lambda, ALB, CloudWatch, Route53, IAM Azure: AKS, Azure DevOps | GCP basics Kubernetes, Helm, ArgoCD — zero-downtime deployments, cluster management, autoscaling Docker — containerization, multi-stage builds, registry management CI/CD: Jenkins, GitHub Actions, GitLab CI/CD, Azure DevOps pipelines Infrastructure as Code: Terraform, CloudFormation, Ansible Apache Tomcat (6/7/8), Elastic Beanstalk, cloud migration 🤖 𝐌𝐋𝐎𝐩𝐬 & 𝐀𝐈 𝐃𝐞𝐩𝐥𝐨𝐲𝐦𝐞𝐧𝐭 Kubeflow, MLflow, Airflow — automated ML pipelines end-to-end Dockerized ML models, GPU/CPU inference clusters, LLM deployment pipelines RunPod, CoreWeave, Salad GPU provisioning — workload autoscaling & preemption handling Real-time LLM and lipsync model pipelines, TTS/STT pipelines Event-driven queues & worker pools, per-job cost monitoring Operational runbooks, SLOs, enterprise API integration Python (ML & automation), Bash scripting 🏗️ 𝐒𝐲𝐬𝐭𝐞𝐦 𝐃𝐞𝐬𝐢𝐠𝐧 & 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞 Distributed microservices for high-traffic, high-availability systems Multi-tenant SaaS platform design, API gateway architecture Scalability planning, fault-tolerant systems, 99.9%+ uptime delivery Core banking systems, financial compliance architecture AI-assisted development using Cursor, GitHub Copilot, and Claude API integrations 📌 𝐍𝐨𝐭𝐚𝐛𝐥𝐞 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 • FOCUS: National banking loan portfolio system deployed across Lahore, Islamabad & Karachi. Manages CAD/CRCD administration for Commercial, Corporate, Consumer & Staff loan portfolios countrywide • KredX: Multi-tenant financial trading platform supporting multiple asset classes with distinct approval workflows • Royal Caribbean International: Backend APIs for one of the world's largest cruise lines • Gap: E-commerce backend with payment gateway integration, Redis caching, React & Vue3 frontend 📩 If you need a Senior Engineer who builds your backend, automates your infrastructure, and deploys your AI/ML workloads, without the cost of three separate hires, I'm available. Let's talk. 🔍 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬 Java Spring Boot Developer | Spring MVC Expert | Senior Java Backend Engineer | Java Microservices Architect | REST API Developer | Spring Security | Enterprise Java | Financial Software Developer | Core Banking Developer | Java FinTech Engineer | DevOps Engineer | MLOps Engineer | Kubernetes Engineer | Docker Expert | AWS Cloud Engineer | CI/CD Pipeline Engineer | Terraform Infrastructure | Helm Kubernetes | ArgoCD GitOps | LLM Deployment Engineer | MLOps Automation | GPU Workloads | AI Model Deployment | Kubeflow MLflow | Lipsync Model Deployment | RunPod CoreWeave | TTS STT Pipeline | Event-Driven Architecture | Kafka RabbitMQ | High Performance Backend | Scalable Cloud Systems | FinTech Backend Developer | SaaS Backend Engineer | Azure DevOps | Multi-Cloud Engineer | Vue.js Developer | Vue3 Frontend | Full-Stack Java Vue Developer

I am TOP RATED, a strong Java and PHP developer from the United States. In the past, I worked for the biggest companies such as Oracle, Accenture, First Data, Barclays Bank, etc. I have 20+ years of experience in web development and I highly specialize in - Java (Java EE, Spring, Spring Boot, Spring Annotations, Spring MVC, Spring Security, JMS, Java Struts, Java Servlets, JSP, Hibernate, MyBatis, REST, ActiveMQ). - PHP (Laravel, WordPress) - Javascript (React, Angular, JQuery, Vue.js) - HTML, CSS, Bootstrap, Tailwind CSS - MySQL, Postgres, Oracle, NOSQL, MongoDB. - AWS, WildFly, Apache Tomcat I have built more than 200 systems and I am comfortable working with both existing and new projects. I helped hundreds of clients in their business and I am here to help you as well!

• Having 9+ years of professional experience in the IT Industry including experience in Analysis, Design, and Development of software and web-based Java/ J2EE applications • Possesses excellent technical knowledge & proficiency in relevant Java, Multithreading, Data Structures, problem-solving, and J2EE technologies (Core Java, Spring 3.x and Spring Boot, Spring Data JPA, Spring Security) and Hibernate. • Hands-on experience in writing Junit tests using Mockito with 80% code coverage. • Hands-on experience in Cloud technologies AWS and Spring Cloud • Experience in technical coordination and onsite/ offshore model project delivery • Exposure to creating REST APIs and Microservices • Possesses knowledge of Wealth Management, Insurance, and Banking domains. • Ability to work independently with minimum supervision in a team environment • Skilled in Agile development methodologies and DevOps • Knowledge of multithreaded and concurrent programming model • Experience in NoSQL database MongoDB, DynamoDB. . Experience messaging frameworks like Kafka and Kinesis stream.