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🚀 AVAILABLE FOR JAVA / SPRING BOOT | AWS CLOUD ENGAGEMENTS With over 8 years building backend systems as a Senior Java Developer, I solve complex technical challenges across the full stack from microservices to cloud-native infrastructure. Whether it's designing Spring Boot services, architecting AWS environments, or setting up DevOps pipelines, I bring the expertise that every Java Developer must have, combined with the cloud and infrastructure skills that modern systems demand. 𝗣𝗿𝗼𝗳𝗲𝘀𝘀𝗶𝗼𝗻𝗮𝗹 𝗕𝗮𝗰𝗸𝗴𝗿𝗼𝘂𝗻𝗱: ➡ Over 8 years as a Java Developer in end-to-end software development across the full delivery cycle. ➡ Designing Spring Boot microservices and high-performance Java applications for fintech, healthcare, SaaS, and e-commerce as a Java Backend Develope and now extending that into cloud engineering and DevOps. ➡ AWS Cloud Engineer - EC2, S3, Lambda, SQS, SNS, IAM, API Gateway, CloudFormation. I design and run cloud infrastructure, not just deploy to it. ➡ DevOps & CI/CD - Docker, Kubernetes (K8s), Helm, Terraform, Jenkins, Azure DevOps, OpenShift. Working with both AWS DevOps and Azure DevOps pipelines that ship code reliably. ➡ Network engineering in cloud environments ➡Over 20 completed projects as a java software engineer 𝗟𝗲𝗮𝗱𝗲𝗿𝘀𝗵𝗶𝗽 𝗮𝗻𝗱 𝗙𝗼𝗰𝘂𝘀: ➡ Led cross-functional teams as a Senior Java Developer, delivering clean architecture and scalable cloud-connected solutions. ➡ Guided developers in Spring Boot, Java, and React as a lead Java Backend Developer, maintaining enterprise-grade quality standards. ➡ Consistently raised team output by implementing the best practices any Senior Java Developer is expected to own. 𝐏𝐫𝐨𝐠𝐫𝐚𝐦𝐦𝐢𝐧𝐠 𝐋𝐚𝐧𝐠𝐮𝐚𝐠𝐞𝐬 & 𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬 As a Java Backend Developer I work with: ✅ Languages: Java, Java 8, Java 11, Java SE, Java EE, JavaFX, SQL, JSON, XML, YAML, Python ✅ Frameworks: Spring (Spring Boot, Spring MVC, Spring Data, Spring Cloud, Spring Security, Spring AOP, Spring Batch, Spring WebFlux), Hibernate, JPA, Quarkus, React, Node.js As a Senior Java Developer, I use these to build enterprise applications that are maintainable, scalable, and secure. 𝐂𝐥𝐨𝐮𝐝, 𝐃𝐞𝐯𝐎𝐩𝐬 & 𝐈𝐧𝐟𝐫𝐚𝐬𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 ✅ AWS Cloud Engineer: EC2, S3, SQS, SNS, Lambda, IAM, RDS, API Gateway, CloudWatch, CloudFormation ✅ Azure Cloud Engineer: Azure DevOps, Azure Kubernetes Service ✅ Google Cloud Engineer: GCP core services ✅ Kubernetes, Helm, Docker, Terraform, Jenkins, Maven, Gradle, Git (GitLab, Bitbucket) ✅ AWS DevOps & Azure DevOps pipelines, OpenShift, Infrastructure as Code 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬 & 𝐌𝐞𝐬𝐬𝐚𝐠𝐢𝐧𝐠 ✅ MySQL, PostgreSQL, MongoDB, Redis, DynamoDB ✅ Kafka, RabbitMQ, REST APIs, SOAP, gRPC, WebSockets 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐚𝐥 𝐏𝐚𝐭𝐭𝐞𝐫𝐧𝐬 & 𝐏𝐫𝐢𝐧𝐜𝐢𝐩𝐥𝐞𝐬 ✅ Architectures: Microservices, Event-driven, SOA, Monoliths ✅ Patterns: CQRS, Saga, Circuit Breakers, Service Discovery, Distributed Systems ✅ Principles: SOLID, Clean Code, Domain-Driven Design (DDD) A Java Developer must master these to deliver systems that scale that's what I build every day. 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐏𝐫𝐚𝐜𝐭𝐢𝐜𝐞𝐬 ✅ Testing: JUnit, Mockito, TestNG, Unit & Integration Testing ✅ Methodologies: Agile (Scrum, Kanban), TDD, BDD ✅ Version Control: Git, GitLab, Bitbucket My workflow as a Senior Java Developer runs on Agile principles and a test-first mindset, producing applications that are production-ready from day one. 𝐀𝐫𝐞𝐚𝐬 𝐨𝐟 𝐀𝐜𝐭𝐢𝐯𝐢𝐭𝐲 Backend development • Full-stack development with Spring Boot + React • AWS cloud engineering • Azure cloud engineering • Google cloud engineering • DevOps & CI/CD • Network engineering • API integration • Cloud-native applications • SaaS platforms • Android Java development As a Senior Java Developer and aws cloud engineer, I cover the full path from backend code to cloud deployment. 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 During my career as a Java Backend Developer I've worked across: Fintech • Healthcare • E-commerce • Enterprise Applications • Cloud Computing • Telecommunications • Logistics • Travel & Hospitality • Media • Automotive • Blockchain • IoT • SaaS • Retail 𝐒𝐩𝐞𝐜𝐢𝐚𝐥𝐢𝐳𝐚𝐭𝐢𝐨𝐧𝐬 & 𝐑𝐨𝐥𝐞𝐬 ✔ Senior Java Developer ✔ Java Spring Boot Developer ✔ Java Backend Developer ✔ AWS Cloud Engineer / AWS DevOps Engineer ✔ Azure Cloud Engineer / Azure DevOps ✔ Google Cloud Engineer ✔ Kubernetes & Network Engineer ✔ API Developer ✔ Full-Stack Developer (Spring Boot + React) ✔ Android Java App Developer 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 ✔ Java Development Services ✔ Spring Boot Microservices Development ✔ AWS Cloud Engineering & Migration ✔ AWS DevOps / Azure DevOps Pipeline Setup ✔ Kubernetes Cluster Management ✔ Infrastructure as Code (Terraform) ✔ API & System Integration ✔ SaaS Application Development ✔ Android Java App Development ✔ Performance Tuning & Code Reviews 👉 Need a Java Developer who writes clean code and ships it to the cloud? Just drop me a message 04/06/2026

Mobile Expert Moving a business idea from concept to a high-load production environment requires more than just coding - it requires a seamless fusion of design and engineering. I provide a comprehensive product-building experience. My team and I don’t just build apps; we craft high-performance digital products specializing in GPS Navigation, Wellness, and Sport Tech. What I bring to your project: - User-Centric UI/UX Design: We don't just "design UI." We build intuitive user journeys, high-fidelity prototypes, and data-driven interfaces that keep users engaged in Health & Fitness ecosystems. - Full-Cycle Delivery: From seamless Flutter/Native interfaces to robust Java/Quarkus microservices and Kafka event-driven architectures. - Domain Expertise: Deep understanding of the specific challenges in Health & Fitness tech (data sync, wearables, GPS tracking). - Architectural Excellence: I ensure your application is built for 100k+ concurrent users from day one. - Business-Centric Approach: I focus on ROI, time-to-market, and scalable code that doesn’t require a complete rewrite in 6 months. - Core Expertise for Your Success: - Mobile: Flutter, Kotlin (Android), Swift (iOS). - Backend & Systems: Java 17, Spring Boot, Quarkus, Kafka (Real-time data). - Architecture: RESTful APIs, Microservices, Event-Driven Design. I am happy to discuss our approach and how my team and I can accelerate your roadmap. Let’s build something extraordinary together.

📢 Available for new projects 📢 I'm a Senior Java Developer with more than 10 years of commercial experience building stable, scalable, and secure backend systems. I specialize in Spring Boot microservices and cloud-native architecture — and I've shipped production systems in Fintech, EdTech, Healthcare, Retail, Hospitality, etc. My core strength is backend architecture: clean APIs, event-driven systems, and services that scale. I also work across the full stack development when needed — React on the frontend, Node.js for integrations, and AWS for deployment and infrastructure. What I bring to your project: - Production-grade Spring Boot microservices and REST APIs - Cloud infrastructure on AWS with Docker and CI/CD pipelines - Full-stack capability: Java backend + React frontend - Relational and NoSQL databases: PostgreSQL, MySQL, MongoDB - Clean, maintainable code with TDD and Agile workflows I've worked on SaaS platforms, enterprise systems, and MVPs — from initial architecture through to deployment. Go-To Stack: Java (Spring Boot, Spring Cloud, Hibernate) · React · Node.js · AWS · Docker · PostgreSQL · MongoDB · Jenkins · GitFlow Ready to start - just drop me a message and we will start working!

.Net Full stack engineer | 15+ years in enterprise software | 5+ years in Blazor and MAUI ✔️Legacy code makes updates slow, risky and expensive ✔️Web, backend, and mobile parts stop working as one system ✔️Performance issues affect users and operations ✔️Technical debt grows faster than the product itself ✔️Teams need secure, maintainable and scalable software If this sounds familiar, we should talk. As a .Net full stack Developer and Blazor developer I help companies design, modernize and scale secure business applications with a strong focus on maintainability, performance and long-term product stability. ━━━━━━━━━━━━ Core expertise ━━━━━━━━━━━━ My main focus is Blazor c# and .Net full stack. As a Blazor developer I specialize in enterprise-grade delivery where architecture quality, security, and predictable execution matter as much as speed. I have supported SaaS platform delivery, migration and upgrade projects, and refactoring legacy systems for products that needed modernization without disrupting business operations. As a full stack developer ( web developer ), I work across frontend, backend, API, database and deployment layers, including HTML ( HTML5 ), JavaScript, jQuery and MySQL when legacy or mixed stacks require them. As a backend developer, I design systems that remain stable under growth, easier to maintain and clearer to extend. I’m usually brought in when a team needs to improve delivery quality, modernize an aging platform, migrate mobile products, or restore control over a codebase that has become difficult to scale. ━━━━━━━━━━━━ What I deliver as a Blazor developer ━━━━━━━━━━━━ I build and improve applications using blazor webassembly, blazor server, .net blazor, blazor c#, blazor maui, mudblazor, blazor syncfusion, blazor telerik and syncfusion for internal platforms, customer portals, dashboards, and cross-platform business tools. On the service layer, I design and implement asp.net, ASP.NET Core, ASP.NET Web API, ASP.NET MVC, .NET Framework and .net core solutions with restful api architecture, secure integrations, background processing, caching and scalable business logic. My experience as a .net backend developer includes role-based access, secure authentication, structured logging, auditability and performance optimization. As a maui developer and c sharp developer, I build modern cross-platform mobile and desktop products with strong engineering discipline. My c# programming approach is focused on clean architecture, maintainable code structure, and long-term ownership. I use mvvm where it improves testability and keeps mobile or desktop solutions easier to evolve. I also work with azure serverless and azure function patterns when a product benefits from modular cloud execution, event-driven workflows or lightweight service orchestration. ━━━━━━━━━━━━ Best-fit project types ━━━━━━━━━━━━ I’m a strong fit for: SaaS platform development migration and upgrade projects Xamarin to MAUI modernization enterprise dashboards and internal systems secure API and backend architecture Blazor-based web platforms cross-platform mobile applications with long-term support in mind ━━━━━━━━━━━━ Why clients hire me ━━━━━━━━━━━━ Companies usually bring me in when they need a blazor developer for enterprise UI delivery, platform modernization, performance improvement, cross-platform product strategy, or long-term ownership of a business-critical application. The same is true when teams need a .net developer to stabilize delivery, modernize legacy systems, improve architecture, strengthen backend services, or support product growth with clear technical direction. When a product needs .net full stack ownership across backend and frontend, .net full stack execution for web and mobile, .net full stack support for modernization, .net full stack leadership for architecture-heavy delivery, or .net full stack problem-solving during a recovery phase, I can step in quickly and move forward with a structured plan. 🔧Broader collaboration scope While my core specialization is .NET, I collaborate effectively in mixed delivery environments that include Angular, AngularJS, React, Node.js, (react js ) and react node developer workflows. I can also align with teams using xamarin, wordpress integrations, figma-based handoff, Adobe Photoshop materials, Web Design references, flutterflow prototypes, obs-related workflows, support from a java developer and css responsive adjustments where needed. 🧩Delivery approach Discovery → technical alignment → architecture definition → iterative implementation → documentation → handover 📍Availability Based in Ukraine with working overlap for EU and US teams, I continue delivering production-grade software from a secure location. If you need an experienced engineering partner to build, modernize, or recover a .NET product, I’m ready to help with a clear and realistic approach.

I'm in java since 2009 I'm experienced design and developing applications based on java technology stack. Architectural approaches: - Monolith - SOA - Microservices Web services: RESTful, SOAP DataBases: Oracle, MySQL, MongoDB My roles in projects: - designing architecture - choosing technological stack - developing application - writing unit and integration test Preferable cloud provider: - AWS: S3 , EC2 , CDN, Lambda - Azure Java frameworks: - Spring (Spring Boot, Spring Cloud, etc) - Vert.X PDF Generators: iText, Freemarker Blockchain: web3j

🟢 Looking for a developer who can boost your business processes using AI? 🟢 Hi, I’m Vitaliy, Top Rated Plus Python Developer and Automation Expert at DataOx with 10+ years of experience in Python and Java backend development, AI-powered automation platforms, LLM integrations, and large-scale data systems. For 8 years on Upwork I’ve completed numerous projects, maintaining a 97% Job Success score, delivering production-ready systems, AI agents, workflow automation solutions, data pipelines, and intelligent backend architectures that help companies reduce manual work, process high volumes of data, and scale operations efficiently. ⭐️⭐️⭐️⭐️⭐️ "The team is extremely efficient, creative, communicative, and flexible. They are excellent at bringing ideas and concepts to life. Our team has worked with other developers in the past, and no one compares to these guys. Do yourself a favor and hire them for your project." What I can help you with: • Web scraping & data extraction (complex, dynamic websites, anti-bot bypass) • API development & integrations (REST APIs, third-party services) • Workflow automation, RPA & backend systems • AI solutions: AI Chatbots, AI Agents & AI Automation for business workflows, LLMs, NLP, bots, intelligent processing • ETL pipelines & data engineering • System integration & custom tools • Python and Java backend, Web Applications & SaaS platforms My Technical Stack AI & LLM Systems: OpenAI API, LangChain, PyTorch, TensorFlow, LLM integration, RAG pipelines, multi-agent workflows, prompt engineering & optimization, AI chatbot backends Backend & Automation: Python, Java, FastAPI, Flask, Django, Spring Boot, REST APIs, Playwright, Selenium, Scrapy, BeautifulSoup Frontend: JavaScript, TypeScript, ReactJS, Next.js, Tailwind CSS Data & Infrastructure: Pandas, SQLAlchemy, PostgreSQL, MongoDB, BigQuery, Airflow, Docker, Kubernetes, AWS, GCP, Azure My Results in Numbers: 🔶 AI Recruitment Platform: Built AI hiring platform with 900K+ candidates, 20K jobs, 2.5K companies, 120K assessments/year, 20K video interviews, 680K candidates via integrations. 🔶 Global Certification Data Platform: Automated aggregation of 500K+ records/month, reducing search time from days to 15–30 minutes and accelerating deal cycles by 3-5x. 🔶 AI Document Intelligence System: Processed 1M+ documents/year with LLM, achieving 90%+ extraction accuracy, reducing manual work by 80%, handling 50+ document types, and scaling to 10K+ documents/day with automated validation Why Clients Choose Me Experience: 10+ years in backend engineering, Python development, Java Development and scalable AI systems Proven Quality: 97% Job Success Score and Top Rated Plus on Upwork Expertise: AI automation, LLM integrations, workflow automation, and production-ready backend architectures 📩 Send me your project requirements, and I’ll provide a clear, high-impact strategy to turn your vision into reality.