Most backend systems don't fail because of bad developers. They fail because no one took real ownership, of performance, of scalability, of the decisions that matter when traffic spikes or a payment gateway breaks. That's the gap I fill. I'm a Senior Java Spring Boot Engineer with 9+ years of experience building backend systems for fintech platforms, high-compliance environments, and cloud-native microservices. I take full ownership from development to production — not just the next ticket on the board. 🏆 Top Rated Plus — Top 3% of developers on Upwork 💼 9+ years building scalable backend & cloud-native systems 📦 7000+ Upwork hours with consistent 5★ feedback 💰 20+ enterprise-grade platforms delivered globally 🌍 Available across EST, CET, and PKT timezones ⚙️ 𝐖𝐡𝐚𝐭 𝐈 𝐁𝐮𝐢𝐥𝐝 Backend & Microservices: Java 8–21, Spring Boot 3, Spring Security, Hibernate/JPA, REST/gRPC, Kafka, Event-Driven Architecture Cloud & DevOps: AWS (Lambda, ECS, S3, Aurora), Docker, Kubernetes (EKS), CI/CD (GitHub Actions, CodePipeline) Data & Messaging: PostgreSQL, MySQL, MongoDB, Redis, Kafka Streams Security & Testing: OWASP Top 10, RBAC, JWT/OAuth2, JUnit, Mockito, Testcontainers Frontend & Integration: React, TypeScript, Third-party APIs, Payment Gateways AI-Accelerated Development: GitHub Copilot, Cursor, Bolt.new — faster delivery, smarter workflows, automated testing ⭐ 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 𝐓𝐡𝐚𝐭 𝐒𝐩𝐞𝐚𝐤 𝐟𝐨𝐫 𝐓𝐡𝐞𝐦𝐬𝐞𝐥𝐯𝐞𝐬 𝗚𝗹𝗼𝗯𝗮𝗹 𝗙𝗶𝗻𝗮𝗻𝗰𝗶𝗮𝗹 𝗠𝗲𝗱𝗶𝗮 — Rebuilt and deployed on AWS S3 + CloudFront. Delivered 95+ PageSpeed score, 67% faster load times, 43% increase in organic traffic, and 35% reduction in bounce rate. 𝗗𝗲𝗰𝘆𝗽𝗵𝗮 — Contributed to a premier financial intelligence platform trusted by business and financial professionals across the MENA region for 10+ years. Integrated financial APIs, payment gateways, and real-time data feeds using Spring MVC, Oracle, and WebSockets. 𝗕𝗮𝗵𝗿𝗮𝗶𝗻 𝗣𝗿𝗶𝘃𝗮𝘁𝗲 𝗠𝗮𝗿𝗸𝗲𝘁 — Built a secure electronic share registry system for closed shareholding companies, integrated directly with Bahrain Clear as part of the exchange's core infrastructure. High-compliance fintech environment using Spring Boot, Spring Security, and Angular 9. 💡 𝐖𝐡𝐲 𝐄𝐧𝐭𝐞𝐫𝐩𝐫𝐢𝐬𝐞 𝐓𝐞𝐚𝐦𝐬 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞 I think in systems, not just tickets. I look at the full picture — performance bottlenecks, integration risks, deployment reliability, and long-term maintainability. I work independently or inside existing teams, communicate clearly throughout, and deliver production-ready code that doesn't need babysitting after handoff. 📩 𝐋𝐞𝐭'𝐬 𝐓𝐚𝐥𝐤 Have a backend challenge or a platform to build? Message me directly or let's jump on a quick 15-minute call — I'll give you a direct technical assessment of your system and the best path forward. 🔑 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬 Java Developer · Spring Boot Developer · Microservices Architecture · Fintech Backend · AWS Backend Developer · REST API Development · Kafka · Distributed Systems · Enterprise Java · Cloud Native · Hibernate · Backend Engineer · PostgreSQL · Docker · Kubernetes · Spring Security · Event-Driven Architecture

🟢 𝗣𝗮𝗿𝘁 𝗼𝗳 𝘁𝗵𝗲 𝗧𝗼𝗽 𝟭% 𝗘𝘅𝗽𝗲𝗿𝘁-𝗩𝗲𝘁𝘁𝗲𝗱 Full-Stack Developers on Upwork 🚀 Specializing in 𝗔𝗻𝗴𝘂𝗹𝗮𝗿 (𝟭𝟴+), 𝗝𝗮𝘃𝗮 (𝟭𝟳+), 𝗦𝗽𝗿𝗶𝗻𝗴 𝗕𝗼𝗼𝘁, 𝗔𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻, 𝗔𝗣𝗜 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁, 𝗙𝗶𝗻𝘁𝗲𝗰𝗵, and Scalable Web Applications. With 𝟭𝟬+ 𝘆𝗲𝗮𝗿𝘀 delivering robust, maintainable, and scalable software solutions, I combine front-end expertise in Angular and back-end mastery with 𝗝𝗮𝘃𝗮 𝗮𝗻𝗱 𝗦𝗽𝗿𝗶𝗻𝗴 𝗕𝗼𝗼𝘁 𝘄𝗶𝘁𝗵 𝗔𝗜 𝗶𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 𝘀𝗸𝗶𝗹𝗹𝘀 including 𝗚𝗣𝗧-𝟰, 𝗟𝗮𝗻𝗴𝗖𝗵𝗮𝗶𝗻, 𝗖𝘂𝗿𝘀𝗼𝗿 𝗔𝗜, 𝗣𝘆𝘁𝗵𝗼𝗻, 𝗮𝗻𝗱 𝗡𝗼𝗱𝗲.𝗷𝘀. I build powerful AI-driven automation, chatbots, and API workflows. 𝗪𝗵𝘆 𝘄𝗼𝗿𝗸 𝘄𝗶𝘁𝗵 𝗺𝗲? ✅ 𝗗𝗲𝗲𝗽 𝗲𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 𝗶𝗻 𝗔𝗻𝗴𝘂𝗹𝗮𝗿 & 𝗝𝗮𝘃𝗮 – clean, scalable code optimized for performance ✅ 𝗔𝗜 & 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 𝘀𝗸𝗶𝗹𝗹𝘀 – GPT-4, LangChain, Cursor AI, OpenAI API, Python, Node.js ✅ 𝗖𝗹𝗼𝘂𝗱 & 𝗗𝗲𝘃𝗢𝗽𝘀 – AWS, Kubernetes, Docker, CI/CD pipelines ✅ 𝗧𝗲𝘀𝘁𝗶𝗻𝗴 & 𝗤𝘂𝗮𝗹𝗶𝘁𝘆 𝗔𝘀𝘀𝘂𝗿𝗮𝗻𝗰𝗲 – unit & integration testing with Jest, JUnit, Selenium ✅ 𝗣𝗮𝘆𝗺𝗲𝗻𝘁 & 𝗔𝗣𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻𝘀 – Stripe, Braintree, PayPal, Sendinblue, plus fintech platforms ✅ 𝗧𝗿𝘂𝘀𝘁𝗲𝗱 𝗯𝘆 𝘀𝘁𝗮𝗿𝘁𝘂𝗽𝘀 & 𝗲𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲𝘀 – 50+ projects delivered successfully ✅ 𝗙𝗮𝘀𝘁, 𝗰𝗹𝗲𝗮𝗿 𝗰𝗼𝗺𝗺𝘂𝗻𝗶𝗰𝗮𝘁𝗶𝗼𝗻 & 𝗿𝗲𝗹𝗶𝗮𝗯𝗹𝗲 𝗱𝗲𝗹𝗶𝘃𝗲𝗿𝘆 𝘁𝗼 𝗸𝗲𝗲𝗽 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗷𝗲𝗰𝘁 𝗼𝗻 𝘁𝗿𝗮𝗰𝗸 𝗖𝗿𝗲𝗱𝗲𝗻𝘁𝗶𝗮𝗹𝘀 & 𝗕𝗮𝗰𝗸𝗴𝗿𝗼𝘂𝗻𝗱 ⭐ Oracle Certified Java Professional ⭐ Neural Networks and Deep Learning (DeepLearning.AI) ⭐ Lecturer at Russian-Armenian University (RAU) ⭐ Computer Science graduate, American University of Armenia 𝗖𝗹𝗶𝗲𝗻𝘁 𝗣𝗿𝗮𝗶𝘀𝗲: "Oleg integrated GPT-4 APIs seamlessly, creating a chatbot that boosted our customer engagement by 40%." – AllAboutCustomers "Delivered LangChain automation ahead of schedule, saving us thousands in manual work." – BobbyTech 🚀 Ready to build your next AI or fintech solution with a trusted expert? Message me today and let’s create something amazing!

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.

⭐⭐⭐⭐⭐ Top Rated Plus on Upwork 100% Job Success Score I'm a Java developer with 8+ years delivering production-grade systems from serverless AWS architectures to distributed microservices serving healthcare and fintech clients. 𝗪𝗵𝗮𝘁 𝗜'𝘃𝗲 𝗕𝘂𝗶𝗹𝘁 ➡ As lead Java developer at my current company, managed a team of 8 engineers over 7 years — delivering 4 production systems across healthcare, fintech, and AI verticals. ➡ Designed serverless AWS infrastructure for a US longevity and healthcare platform as an AWS developer — Lambda, AppSync, DynamoDB, Cognito, SNS/SQS, Stripe, HubSpot currently in production. ➡ Led migration from monolithic Spring apps to distributed microservices — reducing deployment complexity and enabling independent scaling per service. ➡ Built a PDF/UA accessibility compliance platform as backend developer using Java 21, iText 7, PDFBox, veraPDF processing and remediating documents of hundreds of pages against international accessibility standards. ➡ Delivered an AI-powered workflow automation platform as an AI developer integrating Spring AI, Azure cloud, and automated Stripe subscription workflows. ➡ Shipped a medical practitioner dashboard integrating 3rd-party hardware APIs and clinical toolkits as backend developer and tech lead serving real patients and practitioners in production. Core experience as a Java developer and Backend developer As a Java developer with 8+ years in production systems, my core is Java 8 through Java 21 with the full Spring ecosystem Boot, Cloud, Security, WebFlux, Batch, and Spring AI for AI-integrated backends. I work across both relational (PostgreSQL, MySQL) and NoSQL (MongoDB, DynamoDB, Redis) databases, selecting the right store based on access patterns not habit. As a backend developer I've optimised slow MongoDB queries to cut response times, redesigned DynamoDB access patterns for a high-throughput healthcare API, and built Redis caching layers that kept latency flat under load. As an AWS developer, my hands-on stack covers Lambda, AppSync, DynamoDB, Cognito, SQS, SNS, SES, S3, API Gateway, Route 53, and CloudFormation built and maintained in a live US healthcare platform. I design serverless pipelines end-to-end, not just deploy to them. For async workloads I wire event-driven systems using Kafka, RabbitMQ, or AWS SNS/SQS depending on durability and throughput requirements. On the container side: Docker, Kubernetes, Helm, OpenShift, Terraform, and Jenkins full IaC from infrastructure definition to CI/CD pipeline. As an AI developer, I've shipped Spring AI integrations for workflow automation backends, built document intelligence services capable of processing and remediating hundreds-of-pages PDFs against accessibility standards, and connected GraphQL APIs via AWS AppSync for mobile and web AI-driven applications. I also have production experience integrating medical hardware APIs, Stripe subscription billing, and HubSpot CRM sync into Java backends the kind of third-party integration work every backend developer eventually owns in a real product. AWS Developer & 𝗖𝗹𝗼𝘂𝗱 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 ✅ Currently operating as AWS developer on a live healthcare platform Lambda, AppSync, DynamoDB, Cognito, SQS/SNS/SES, S3, API Gateway, Route 53, CloudFormation ✅ Experience as AWS developer across serverless, containerized (ECS/K8s), and IaC (Terraform, CloudFormation) environments ✅ Also experienced across Azure (AKS, Azure DevOps) and GCP as multi-cloud backend developer ✅ Kubernetes, Helm, Docker, OpenShift, Jenkins, Terraform the full DevOps chain every AWS developer deploys through AI developer 𝗖𝗮𝗽𝗮𝗯𝗶𝗹𝗶𝘁𝗶𝗲𝘀 ✅ Delivered AI-powered backend services as AI developer using Spring AI automated content generation and workflow orchestration at scale ✅ AWS AppSync + DynamoDB + Cognito pipeline for a live healthcare platform: the architecture an AI developer builds when latency and data integrity are non-negotiable ✅ Experienced AI developer integrating third-party AI tooling with enterprise Java backends designing event-driven pipelines that handle async AI workloads via Kafka and SQS ✅ As AI developer, built document intelligence features automated PDF tagging, structure remediation, and accessibility validation across large document corpora 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀 Healthcare · Fintech · SaaS · E-commerce · Logistics · Telecom · IoT · Blockchain · Automotive · Media 𝗦𝗽𝗲𝗰𝗶𝗮𝗹𝗶𝘇𝗮𝘁𝗶𝗼𝗻𝘀 & 𝗥𝗼𝗹𝗲𝘀 ✔ Senior Java Developer · Java Spring Boot Developer · Java Backend Developer ✔ AWS Cloud Engineer · AWS DevOps Engineer ✔ Azure Cloud Engineer · Google Cloud Engineer ✔ AI Backend Developer · Full-Stack Developer (Spring Boot + React) ✔ AI Backend Developer · Full-Stack Developer (Spring Boot + React) Need a Java developer, backend developer, AWS developer, or AI developer who ships production systems — not prototypes? Drop me a message. 04/06/2026

Hi👋 Will help you as a Java / Cloud architect, senior developer, and team lead with over 21 years of experience in the area (more than 150 projects delivered). We focus on RELIABLE software, and mission-critical operations, for which we use custom reliability technology for software (EDC), to prevent business downtime. I can help you with: • Cloud applications, scalable systems, • AI and LLM integration and development, • API design, development and integration, • High load/data volumes, predictive analytics, • Software for robots and machinery, • Internet of Things (IoT), • Reliable, safety and mission-critical systems. I EARN/SAVE MONEY💰 FOR OUR CUSTOMERS by: • allowing their business to expand (or start sometimes:) • automating processes and reducing operational cost • using newer and more efficient technology • long-run cost reduction because of high-quality software. Don't take my word for it, please review my profile feedback. Some techs below... ✅ Cloud applications Cloud, serverless, scalable applications, architecture and development for Amazon Web Services (AWS) and Google Cloud Platform (GCP). ✅ AI development and integration Embed AI-powered tools to your business and software: AI analytics, predictive maintenance, LLM, chatbots, ChatGPT integration, AI over your data helping your clients. ✅ Complex system development, API integration and development Develop custom software from A to Z, build sophisticated APIs, integrate third-party APIs, data hubs and gateways. ✅ Big data volumes processing, storage, and analytics Receive, process, store and analyze and send huge volumes of data. Cost-efficient data-focused systems on the cloud. ✅ Internet of things (IoT) Connect and manage thousands of simple and complex devices on the cloud, custom automation, reports and analytics. ✅ Other Workflow automation, Performance optimization, QA automation. Some tech details: ✓ Java: Java 8 and further versions, Spring, JavaEE, JavaFX ✓ Spring: SpringBoot, Spring MVC, Spring Security, Spring Data, ... ✓ Cloud: AWS, Google Cloud, Docker, Kubernetes, ECS, EKS, Cloud-native apps, scalable clusters, zero-downtime deployment. ✓ AI: ChatGPT, LLM, Vertex AI, Chatbots. ✓ Databases: Oracle/PostgreSQL/MySQL, big volume storage (AWS Redshift, AWS Athena/S3, Aurora, Cassandra, HDFS), Redis, MongoDB, Neo4j. ✓ Web: Bootstrap, Angular, React, JavaScript, OAuth, Tomcat, JBoss. ✓ APIs: REST, SOAP, XML-RPC, WebServices, WebSockets, Swagger/OpenAPI 3 etc. ✓ AWS: Clusters, AWS EC2, AWS Kinesis, AWS Athena, AWS Redshift, AWS DynamoDB, AWS Lambda, AWS IoT, AWS SQS/SNS, AWS CloudFront/Route53/ApiGateway, vast AWS API usage, and automation. ✓ Data streaming: AWS Kinesis, Firehose, SQS/SNS, Kafka, Camel, RabbitMQ. ✓ Performance optimization: JMeter, JProfiler, AWS X-Ray, GTMetrix, Gatling. ✓ Version control: Git, Github, Bitbucket, GitLab, SVN. ✓ CI/CD: Bamboo, Jenkins, Circle CI, Sonar, Bitbucket pipelines, AWS CodeBuild/CodeDeploy. ✓ Other: Maven, Nexus, Gradle, Ant. I get things done.

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

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;

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

As a Senior Java Engineer with over 10 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.

🥇 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