Senior Java Developer | Spring Boot Expert | Backend APIs | Microservices | AWS | PostgreSQL I help businesses build scalable backend systems, enterprise APIs, and cloud-native applications using Java, Spring Boot, Hibernate, Microservices, AWS, PostgreSQL, MongoDB, and Kafka. With strong experience in Java backend development, I specialize in: ✔ Java 8/11/17+ Application Development ✔ Spring Boot & Microservices Architecture ✔ REST API Development & Third-Party Integrations ✔ Hibernate / JPA / Performance Optimization ✔ PostgreSQL, MySQL, MongoDB ✔ Event-Driven Systems (Kafka, Messaging) ✔ AWS, Docker, Kubernetes ✔ Secure APIs (Spring Security, JWT, OAuth) ✔ Legacy System Modernization ✔ Full Stack Development (Angular, Node.js) What I Deliver * Production-grade Java Spring Boot applications * High-performance backend APIs * Scalable microservices architectures * Enterprise integrations and data-driven systems * Performance tuning, debugging, and system optimization * Cloud-ready deployments on AWS Why Clients Hire Me I focus on clean architecture, maintainable code, and practical solutions not overengineering. Whether you need: * A Spring Boot developer for a SaaS platform * A Java backend developer for APIs or integrations * Help with microservices, performance optimization, or legacy modernization * A developer who uses AI-assisted development to deliver faster while maintaining quality I can help. I’ve worked on complex backend systems involving real-time event processing, enterprise integrations, database-heavy workflows, and scalable cloud deployments. If you need a reliable Java / Spring Boot expert who can take ownership and deliver, let’s discuss your project.

I am a Senior Backend Java Developer with 16+ years of hands-on experience architecting and delivering high-performance, scalable enterprise systems. I specialize in Spring Boot microservices, RESTful API development, and database optimization - consistently delivering bug-free, production-ready code on time. I have successfully built and maintained backend systems across Banking & Finance, eCommerce, Purchase & Procurement, and Legal domains - giving me a deep understanding of business-critical requirements and compliance-sensitive environments. If you need a reliable, senior-level Java developer who treats your project like a long-term investment - not just a task - I am the right partner. What I Deliver: Spring Boot Microservices : scalable, maintainable service architecture RESTful API Development : secure, well-documented, production-grade APIs Database Design & Optimization : PostgreSQL, MySQL, JPA, Hibernate, JooQ Legacy System Modernization : migrate monoliths to modern microservices CI/CD Pipeline Setup : GitLab, Docker, automated testing & deployment Backend Integration : third-party APIs, payment gateways, middleware Performance Optimization : query tuning, bottleneck resolution Code Review & Refactoring : clean code, SOLID principles Technical Skills: Backend & Frameworks : Java (16+ years), Spring Boot (6+ years), Spring MVC (5 years), Struts (3 years), Swing (3 years) API & Security : RESTful API Design, JWT, Keycloak, Swagger / OpenAPI, Postman Databases : PostgreSQL (5+ years), MySQL (3 years), JPA / Hibernate (3 years), JooQ (1+ year) DevOps & CI/CD : Docker (2+ years), GitLab CI/CD (2 years), Git (6+ years), Linux / Ubuntu (3 years) Testing & Quality : JUnit (5+ years), TDD, Test Containers, Integration & Unit Testing, Postman Test, Selenium, Playwright Reporting & Tools : Jasper Reports (3 years), Maven / Gradle (6+ years), Jira (5+ years), Eclipse, NetBeans, JSoup, PDFBox Frontend Support : Thymeleaf, ZK Framework, Responsive Web Applications Domain Experience : Banking & Finance, eCommerce, Purchase & Procurement, Legal. 16+ years of proven, real-world enterprise experience Bug-free delivery through rigorous TDD and quality assurance On-time, milestone-driven project execution Clear, responsive, and professional communication Full project lifecycle coverage - from requirements to post-delivery support Enterprise-grade, clean, and maintainable code every time

🥇 Top-Rated Java Expert | 6+ Years Experience | 100% Job Success I specialize in Java backend development and microservices architecture, delivering scalable, high-performance, and reliable solutions for clients across the globe. I also leverage AI-assisted coding tools (Cursor AI, EasyCode) to accelerate development, ensure clean code, and reduce bugs, giving you faster and smarter results. Why Clients Choose Me ⭐ Top-Rated Freelancer on Upwork 🌍 Worked with clients in USA, Canada, Romania, UAE, India 💯 100% Job Success Score — quality, commitment, and clean code guaranteed 📈 Long-term clients, repeat hires, and glowing reviews Client Testimonials "Fantastic communication. Very fast work. Willing to hop on a google meet session at any time to get more details on the project. I will work with Ahmed again in the future. He completed the job on time and addressed every issue along the way. Absolutely a Great Person to Work With" — Josh, USA “The best Java tutor! Breaks down all problems very clearly. Doing LeetCode together!!!” — Wilson, Canada “Ahmed is a good professional. We had great conversations and worked together to fix the issue.” — Dragos, Romania “Outstanding job helping me set up a Java Spring Boot web service. Highly recommended!” — Singh, India Tech Stack & Expertise Backend Development ☕ Java (All versions), Kotlin 🔐 Spring Framework (Spring Boot, Spring Security, Spring Batch) 🛠️ Microservices Architecture – design, deployment, optimization 🌐 RESTful APIs – scalable, high-performance, secure 📡 Messaging – Apache Kafka, RabbitMQ Databases 💾 SQL – MySQL, PostgreSQL, Oracle 💾 NoSQL – MongoDB, Cassandra AI-Assisted Development 🤖 Use Cursor AI & EasyCode for code completion, refactoring, and bug detection 🚀 Accelerates development and ensures high-quality, maintainable code DevOps & Tools ⚙️ Docker, Kubernetes, Maven, Gradle, Git, SVN, Splunk 🧪 Testing – JUnit, Mockito, TestNG, Selenium Frontend (Optional) 🎨 Angular, HTML5, CSS3, Bootstrap Services I Offer ✅ Java & Kotlin Backend Development (Spring Boot, Microservices, Kafka) ✅ AI-Assisted Coding – Accelerate development, debug, and maintain high-quality code ✅ API Development & Integration – Secure, scalable REST APIs ✅ Database Design & Optimization – SQL & NoSQL ✅ System Architecture & Cloud-Native Solutions ✅ Technical Consulting & Legacy System Modernization ✅ Java/Kotlin Tutoring – Algorithms, DSA, LeetCode, Interview Prep Availability 📆 Open to part-time & full-time projects 💬 Fast response, flexible with your time zone

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.

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;

Java & Spring Boot Architect | AI-Powered Backend Systems | 14+ Years Experience I am a Java & Spring Boot architect with 14+ years of hands-on experience building production-grade enterprise systems — from core banking platforms to AI-integrated microservices. I hold a BSc in Computer Science & Technology and now work as a dedicated full-time freelancer on Upwork, bringing the same rigour I applied in large fintech institutions directly to client projects. My core expertise spans Spring Boot, Spring Framework, and microservices architecture, with deep practical knowledge of SSO & Keycloak, Docker, DevOps pipelines, and GitLab CI/CD. I design systems that are secure, observable, and built to scale — whether that means integrating Kafka for event-driven flows, Flowable BPMN for workflow automation, or AWS for cloud infrastructure. Over the past year I have been heavily invested in the AI/LLM frontier: building Spring AI applications, wiring up MCP (Model Context Protocol) servers, running local models via Ollama, and implementing advanced patterns like tool calling, RAG pipelines, and AI agent workflows. I see AI not as a separate layer but as a first-class citizen inside enterprise Java backends. If you need someone who understands both the old-school reliability of enterprise Java and the new possibilities of AI-augmented architecture — let's talk. CORE STACK: Java · Spring Boot · Spring Framework · Microservices · REST API · Keycloak/SSO · Docker · GitLab CI/CD · DevOps · Kafka · Flowable BPMN · Oracle · PostgreSQL · AWS · Angular AI & EMERGING TECH: Spring AI · MCP · Ollama · Tool Calling · AI Agents · RAG Pipelines · pgvector · LLM Integration · OpenAI API · Prompt Engineering DOMAINS: Banking & Fintech · SWIFT/ISO 8583 · AML/CFT Compliance · NPSB/RTGS · ATM Switch · eKYC · Healthcare/EMR · Document Management

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).

Looking for a skilled software developer who has expertise in Java, Node JS, and EJS? Look no further! With years of experience in software development, I specialize in building scalable, efficient, and secure applications using Java, Node JS, and EJS. My expertise in these technologies allows me to create innovative and high-performing applications that meet your specific business needs. As a Java developer, I have extensive experience in designing and developing Java-based applications. I am well-versed in popular Java frameworks such as Spring and Hibernate and have experience in developing RESTful web services and microservices. In addition to Java, I am also skilled in Node JS and have experience in building applications using the popular Node JS framework, including Express JS. I am proficient in front-end development using EJS and can create dynamic and responsive web pages. My expertise in these technologies allows me to provide end-to-end software development solutions for your business needs. Whether you require a new application from scratch or need help in enhancing an existing application, I can provide customized solutions that meet your specific requirements. In summary, if you're looking for a skilled Java, Node JS, and EJS developer who can deliver high-quality software solutions, then I'm the right person for the job. Let's discuss your project requirements and start building something great!

I am a Senior Fullstack Developer with over 15 years of hands-on experience in building and scaling Java , C# / Net , Angular applications for startups, enterprises, and SaaS platforms. Currently, I’m working as the Chief Technology Officer at InventorSoft, a software development agency specializing in web and mobile solutions. I bring a strategic mix of technical depth, team leadership, and product vision to every project. Why hire me🧐: 📌 Expert in Scalable Java and .Net Architectures - Over 15 years of experience in developing Java, .Net, C#, Angular scalable applications from different domains. - Backend systems built with Spring Boot (15+ years) – Delivered scalable microservices and high-performance business logic for enterprise-grade applications. - ORM & data access with Hibernate – Applied advanced ORM techniques for efficient database interactions, query optimization, and data integrity in distributed systems. - Frontend development with Angular & Thymeleaf Designed and delivered 200+ robust backend systems for SaaS products, e-commerce platforms, and enterprise clients. 📌 Cloud-Native Platform Engineering Specializes in building secure, scalable, cloud-native platforms using leading cloud providers: - 8+ years of production experience with AWS – Deployed scalable, secure, and high-availability applications. - 9+ years of hands-on Azure expertise – Delivered enterprise-grade solutions with Azure App Services, Azure DevOps, and SQL/Azure Storage. - 5+ years of experience on Google Cloud Platform (GCP) – Built and deployed containerized microservices using GKE, Cloud Run, and Firebase. 📌 API-First & Cloud-Native System Design - Strong background in API integration and microservice architecture. - Created high-performance APIs for platforms serving 50K+ users, ensuring seamless third-party integration and scalability. - Experienced in Docker & Kubernetes, enabling CI/CD pipelines and resilient containerized systems. 📌 Full-Stack Leadership & Agile Team Management - Led and mentored teams of 5–25 developers through all stages of the SDLC—requirements gathering to deployment and maintenance. - Specialized in building cross-functional teams for backend-heavy systems, modern UIs (React, Angular, Thymeleaf), and DevOps automation. My latest achievement as a Software Architect: 🤝 Partnered with 45+ SaaS companies to design and deliver secure, scalable platforms using Spring Boot, AWS, and modern cloud services. 🚀 Helped 10 tech startups scale from MVP to production—selecting the right tech stack, defining cloud-native architecture, and assembling strong dev teams. 💼 Enabled 5 client acquisitions through the development of enterprise-grade software that attracted major buyers and investors. 🏭 Led a digital transformation project for a multi-billion-dollar oil company, delivering a secure, API-first platform that automated mission-critical operations. 🧩 Technologies I Specialize In - Languages/Frameworks: Java, C#, .Net, Spring Boot, Hibernate, Thymeleaf, .Net Core - Cloud Platforms: AWS (8+ years), Azure (9+ years), Google Cloud (5+ years) - DevOps Tools: Docker (7+ years), Kubernetes (5+ years) - Integration & Architecture: RESTful API integration, microservices, clean architecture, CI/CD pipelines Clients that I am proud of: 💻 Shoeby – A fashion retail platform focused on modernizing the e-commerce experience with intuitive UI, product personalization, and seamless shopping journeys. 💻 CellRebel – Provides advanced mobile network analytics, helping telecom companies improve coverage and performance based on real user data. 💻 Blade – A technology-powered aviation company offering urban air mobility services, including helicopter and seaplane flights. 💻 Matics – A real-time operational intelligence system for manufacturers, offering production insights and process optimization across the factory. 💻 MedischeScholing – A medical e-learning platform that enables healthcare professionals to access, register for, and track accredited training and certifications. ➡️ Learn more about other projects on the InventorSoft portfolio Keywords: Java, Backend, Developer, Fullstack, Web, Cross-Platform, Mobile, Application, AI, OpenAI, Service, App, Development, Engineer, Integration, Build, Website, Expert, Spring boot, MySQL, Development Team, Integrated, SaaS Platform, remote, Full-stack, Senior, Software, Client Management, GraphQL, API, .NET, Asp.net, Programmer, Technical Lead, Dashboard, MVC, Developers, ASP.NET, AspNetZero, core, software, MAUI, C#, Angular, .Net, Core, Principal, Performance, Scalability, Microsoft, Blazor, SQL, Server, Frontend, React, Ruby on Rails, RoR/React, front-end, Tailwind, feature, JavaScript, ROR, TailwindCSS, Technical Staff

Thanks for reviewing my profile. I’m a client-focused developer with over 6 years’ experience in the tech industry. I have held diverse positions ranging . I can program both python and java very well, so I'm able to rewrite code from one system to another or develop both of directions. For long-term full-time offers (more than 3 months) you have discount (up to 2$ per hour) I hope to hear from you soon to discuss how I can participate in your next project. I am online and available to my clients 24/7 by phone for urgent issues. Stack of technologies I've used: Python (Django), Java (Jsp , Servlet, zkoss), Apache and Nginx configuration, Linux (prefer Ubuntu-centOS), Javascript, Angular , Jquery, HTML, Bootstrap CSS framework. Data storage: Oracle,Mysql, Postgres, Redis, Memcache Source control: Git, Mercurial, SVN , CVS