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Senior Backend Engineer with 10+ years of experience designing and building scalable backend platforms and cloud-based distributed systems. Strong expertise in Java, Spring Boot, and microservices architecture with production deployments on AWS. Experienced in building high-availability APIs, event-driven systems, and real-time services. Proven ability to improve system performance, reliability, and security while collaborating with global engineering teams. TECHNICAL SKILLS Languages: Java (8–17), JavaScript Backend: Spring Boot, Spring MVC, JPA, Hibernate, Google Guice, REST APIs, Microservices, WebSocket Frontend: AngularJS, Angular, React Messaging: Kafka, RabbitMQ Cloud & Infrastructure: AWS (EC2, S3, SQS, SNS, Lambda, Cognito, SES), Docker Databases: PostgreSQL, MySQL Observability: Elasticsearch, Logstash, Kibana (ELK) Security: OAuth2, JWT, Keycloak, OWASP Top 10 DevOps: Jenkins, Azure DevOps, Git, Bitbucket

⭐ 12+ years of experience 🏅8+ years of VueJS & TypeScript ❤️ 4+ years of ReactJS 🏅4+ years of Android & IOS I am a professional Software 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 with 𝗼𝘃𝗲𝗿 𝟭2 𝘆𝗲𝗮𝗿𝘀 of experience building high-quality, scalable web and mobile applications. I specialize in 𝐕𝐮𝐞𝐉𝐒, 𝐑𝐞𝐚𝐜𝐭𝐉𝐒, 𝐓𝐲𝐩𝐞𝐒𝐜𝐫𝐢𝐩𝐭, 𝐒𝐂𝐒𝐒, 𝐓𝐚𝐢𝐥𝐰𝐢𝐧𝐝𝐂𝐒𝐒, HTML, CSS and JavaScript, as well as Android and iOS development. I follow best practices such as 𝐂𝐥𝐞𝐚𝐧 𝐂𝐨𝐝𝐞, 𝐓𝐃𝐃, testing (Unit, Integration, E2E) and Agile methodologies. I have successfully led teams, migrated large-scale projects, and developed impactful UI/UX solutions. With hands-on experience in 𝐦𝐢𝐜𝐫𝐨-𝐟𝐫𝐨𝐧𝐭𝐞𝐧𝐝 𝐚𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞, 𝐂𝐈/𝐂𝐃 𝐚𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧, and 𝐜𝐥𝐨𝐮𝐝 𝐬𝐞𝐫𝐯𝐢𝐜𝐞𝐬, I ensure seamless, high-performance applications. 𝐖𝐡𝐚𝐭 𝐈 𝐂𝐚𝐧 𝐃𝐨 𝐟𝐨𝐫 𝐘𝐨𝐮: ✅ 𝐅𝐫𝐨𝐧𝐭-𝐄𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 – Build fast, responsive, and scalable web applications using VueJS, ReactJS, and TypeScript. ✅ 𝐋𝐞𝐠𝐚𝐜𝐲 𝐂𝐨𝐝𝐞 𝐌𝐨𝐝𝐞𝐫𝐧𝐢𝐳𝐚𝐭𝐢𝐨𝐧 – Migrate old applications from Vue 2 to Vue 3, improve performance, and optimize maintainability. ✅ 𝐂𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭-𝐁𝐚𝐬𝐞𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 – Create reusable, pixel-perfect UI components aligned with Figma designs. ✅ 𝐓𝐞𝐬𝐭𝐢𝐧𝐠 & 𝐂𝐨𝐝𝐞 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 – Implement tests following TDD (Jest, Cypress) to ensure reliability and maintainability. ✅ 𝐌𝐢𝐜𝐫𝐨-𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞 – Transition monolithic front-end applications to a micro-frontend approach for scalability. ✅ 𝐏𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧 – Improve loading times and overall UX through Vite, lazy loading, and efficient bundling. ✅ 𝐂𝐈/𝐂𝐃 & 𝐃𝐞𝐯𝐎𝐩𝐬 – Automate deployment workflows using Docker, Kubernetes, Terraform, and AWS (CloudFront, API Gateway, Lambda). ✅ 𝐌𝐨𝐛𝐢𝐥𝐞 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 – Build Android and iOS apps, including native apps using Java, Kotlin, and Swift, or hybrid apps using Flutter. 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤: 🔹 𝐋𝐚𝐧𝐠𝐮𝐚𝐠𝐞𝐬: JavaScript, TypeScript, Java, Kotlin, Swift, Flutter 🔹 𝐅𝐫𝐨𝐧𝐭-𝐄𝐧𝐝 𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬: VueJS, ReactJS, SCSS, TailwindCSS, Vuetify, Ant Design, Bootstrap 🔹 𝐓𝐞𝐬𝐭𝐢𝐧𝐠: Jest, Vitest, Cypress 🔹 𝐃𝐞𝐯𝐎𝐩𝐬 & 𝐂𝐥𝐨𝐮𝐝: Docker, Kubernetes, Terraform, AWS, CI/CD 🔹 𝐏𝐫𝐨𝐣𝐞𝐜𝐭 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭: Agile, SCRUM, Stakeholder Collaboration 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐬: 🔹 𝐓𝐫𝐚𝐧𝐬𝐟𝐨𝐫𝐦𝐞𝐝 a large-scale legacy system from Vue 2 to Vue 3 for enhanced performance and maintainability. 🔹 𝐋𝐞𝐝 the migration of a monolithic front-end to a micro-frontend architecture. 🔹 𝐁𝐮𝐢𝐥𝐭 𝐚𝐧𝐝 𝐨𝐩𝐭𝐢𝐦𝐢𝐳𝐞𝐝 reusable UI components with Figma-aligned designs. 🔹 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐝 high-performance apps for POS systems, member loyalty programs, and AI-powered retail solutions. 🔹 𝐂𝐨𝐧𝐭𝐫𝐢𝐛𝐮𝐭𝐞𝐝 to fintech applications, improving security, user authentication, and KYC integrations. 𝐋𝐞𝐭’𝐬 𝐖𝐨𝐫𝐤 𝐓𝐨𝐠𝐞𝐭𝐡𝐞𝐫! If you need a skilled front-end developer who delivers clean, efficient, and scalable solutions, let’s chat! I'm open to long-term projects, consulting, and team collaboration. 📩 Contact me today to bring your project to life!

I have been working with Java language for around ten years on many aspects of Java from core java to J2EE, Java web, and also with some famous java framework such as Spring, Hibernate, Kafka, Elastic Search, Lucene, and many others. My experience technology stack: - Java - Spring Framework (Core, MVC, Boot, Security, Microservices, Cloud, OAuth) - Dropwizard - Hibernate - Restful and SOAP web service - Postgres, MySQL, MongoDB - JavaScript, TypeScript, Angular, ReactJS, NodeJS - DevOps - Jenkins, Docker, Kubernetes, GitOps - Cloud - AWS, GCP

Senior Full-Stack Engineer with 10+ years of experience and a Master's degree in Computer Science. $50K+ earned on Upwork across 10 completed jobs with 2,751+ billable hours. I build production-grade web applications end-to-end - from React/Next.js front-ends to Node.js and Python (FastAPI/Django) back-ends, deployed on AWS, Azure, or GCP. My core strength is owning the full stack: I can take a product idea, design the architecture, ship the UI, build the APIs, set up the database, deploy to cloud, and integrate AI capabilities (OpenAI, Claude, LLM APIs) where they genuinely add value - without you needing to coordinate three different specialists. Whether you're a startup shipping your MVP, an SME modernizing a legacy stack, or a product team adding AI features to an existing SaaS, I deliver code that runs in production, not prototypes that need a rewrite. ✅ What I Can Do For You: ▪️ Full-Stack SaaS development. End-to-end delivery with React, Next.js, Node.js, Python (FastAPI/Django), PostgreSQL, and MongoDB. Production deployment with Docker, AWS, and GCP. ▪️ AI Integration into existing web apps. Integrate OpenAI, Claude, and other LLM APIs into your SaaS. Build RAG pipelines, custom chatbots, and document intelligence workflows using LangChain, LlamaIndex, and vector databases (Pinecone, Weaviate). ✅ My Technology Stack: ▫️ Frontend: React, Vue.js, Angular, HTML5/CSS, Bootstrap ▫️ Backend: Node.js, Java (Spring Framework), C#/.NET (ASP.NET Core, .NET Framework), Python ▫️ Machine Learning & AI: Python, PyTorch, TensorFlow, OpenCV, scikit-learn, NLTK, BERT, Apache Spark, XGBoost ▫️ Computer Vision: OpenCV, YOLOv5, Tesseract OCR, deep learning for image recognition ▫️ Data: PostgreSQL, MongoDB, Redis, MySQL, Microsoft SQL Server, Oracle Database ▫️ Cloud/DevOps: AWS, Azure (including Azure Bot Service), Google Cloud Platform ▫️ Currently expanding into: LLM integration (OpenAI, Claude APIs), RAG pipelines with LangChain, and modern AI agent workflows ✅ Let's Get Started: If you have a full-stack build, a legacy system to modernize, or an AI feature you want shipped properly inside a real product, send me a brief message describing your goals. I'll respond within 24 hours and am available for both short engagements and long-term retainers. Keywords: Full-Stack Development, React, Next.js, Node.js, Python, FastAPI, Django, TypeScript, JavaScript, PostgreSQL, MongoDB, AWS, Azure, GCP, Docker, SaaS Development, Web Application, API Integration, AI Integration, OpenAI API, Claude API, LangChain, RAG

I am highly experienced Java developer with 12 years of industry experience and have been specializing in solutions using Java CMS enterprise platforms like Bloomreach CMS and Adobe Experience Manager (AEM) for the past 6 years. I've built products with AEM 6.5 and have experience with migrating to Cloud Service. In 2023, I was certified as both Adobe Experience Manager Sites Developer Professional ( AD0-E123 ) and Adobe Experience Manager Sites Developer Expert ( AD0-E134 ). Having solid experience working with various JavaScript frameworks like Angular and ReactJS and the drive to pick up new ones when necessary. I am also familiar with Less, SCSS, and CSS and the concepts of building responsive sites using Bootstrap and AEM Grid. Constantly strive to write clear and maintainable code and fully document my code to ensure future developers have a clear understanding of all methods and classes. Also, I will gladly provide any additional documentation or training materials requested, which will be well-structured and well-written. A strong problem solver, skilled at exploring and debugging complex problems to get software applications back on track when strange errors or edge-case scenarios arise.

3 year experience in JavaScript frameworks: - React - React Native - Angular 2+ - NodeJS - ExpressJS ... Familiar with SQL(Oracle, MySQL) and NoSQL (MongoDB, Firebase) Bachelor degree in Information and Software development by top University of IT in Vietnam Experienced in outsource and product development. What you will get from me: - Quality of work. - Regular update of the result. - FREE 1 month's supporting after final delivery. - Flexible milestones. - Maintain long-term and good relationship with clients. Feel free to ping me if you have any question.