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👋 Hello! Senior Java Developer, Team Lead & Architect with 10+ years of hands-on experience with 10+ years of hands-on experience building scalable, high-load web and mobile applications. I mainly work with Java backend, JavaScript, TypeScript, Oracle, Postgres databases. My core backend work is centered on Spring Boot, focusing on API development and production-grade RESTful services backed by PostgreSQL. My focus is on backend software architecture, ensuring scalability, clean boundaries, and long-term maintainability. ✔️ Ready-to-Use Integrations I can accelerate your product using proven, production-ready integrations: 🚀 AI & LLMs: ChatGPT, LLaMA, Mistral (text, images, vision, automation) 🚀 Payments: Stripe (card payments & transfers) 🚀 Voice & Media: ElevenLabs (speech & voice AI) 🚀 Communication: Zoom (voice & video integrations) My Specialization: ✅ Backend & Architecture: Java (10+ years): modern Java (Lambdas, Streams, Date/Time API), Spring (9+ years): Spring Boot, Spring Data, Spring Cloud for microservices and distributed systems, and Java EE: REST APIs, SOAP, JPA, third-party integrations ✅ Security & Frameworks: Keycloak with OAuth2 and JWT-based authentication, JHipster, Swagger, Liquibase, Axon, Vaadin, ORM: Hibernate, Blaze-Persistence ✅ Databases & Messaging: SQL (10+ years): PostgreSQL, MySQL, MariaDB, Oracle, NoSQL: MongoDB, Redis, Hazelcast, Messaging: Kafka, ActiveMQ, RabbitMQ, Zookeeper, Firebase Messaging ✅ DevOps & Observability: CI/CD: Jenkins, Docker, Kubernetes, ELK Stack (Logstash, Elasticsearch, Kibana) ✅ Quality & Delivery: Testing: JUnit, Mockito, Spring Test, Unit & Integration testing, Full SDLC, code reviews, refactoring, clean architecture 💡 Let’s discuss how I can help you build a reliable, scalable solution!

👋 Hey everybody and welcome to my Upwork space! I’m an experienced Java developer who’s working with the up-to-date and most effective technologies. To ensure the highest quality standards, I tend to adhere to best coding practices. I continue to improve my skills and already know that the best way to learn something new and evolve as a professional is to work on the projects as a part of a team. I'm open to small and mid-size projects. Very communicative and easy-going. Ready for any skills evaluation, test task, technical interview. My tech stack: ▪ Backend: Java ▪ Frontend: Angular, React, HTML/CSS ▪ Frameworks: Spring Framework (SpringMVC, Spring Boot, Spring Data, Spring Security), Camunda 7 & 8 (Tasklist API, Operate API, Zeebe API, Web Modeler API) ▪ ORM: Hibernate ▪ Testing: JUnit, Mockito ▪ VCS: Git(GitHub, GitLab) ▪ Relational databases: MySQL, PostgreSQL, MariaDB ▪ NoSQL databases: MongoDB, Redis, DynamoDB, CosmosDB ▪ Build automation tools: Maven, Gradle ▪ API documentation tools: Swagger ▪ Clouds: AWS, Cloudinary–basic ▪ CI/CD: Jenkins ▪ IDE: IntelliJ IDEA ▪ Other: REST API, Design Patterns, Log4j 2, Lombok, Thymeleaf, Jakarta Servlet, JSP, JSTL, Guava, Groovy, Web Sockets, PDFsharp Workflow: - Agile, Kanban, Scrum - GIT, SVN (bitbucket/github/gitlab) - Jira, Trello, Asana, Assembla, Basecamp, ProjectPlace. I am up to long-term and full-time collaboration, so if you need a talented dev with technical background, feel free to drop me a line any 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;

With over a decade of experience in software development, I specialize in building robust and scalable backend solutions using Java and Spring Boot. My expertise extends to cloud platforms (AWS, Google Cloud, Azure) and microservices architecture, making me adept at optimizing performance and ensuring resilience in cloud environments. I have successfully led and contributed to various high-impact projects for companies like GetYourGuide, Celonis, and Graylog, where I consistently delivered top-quality code and innovative solutions. Whether you need a reliable freelancer to enhance your platform or a consultant to guide your team, I'm here to help.

Experienced Java developer, focused on solving customer problems of maximum efficiency. I specialize in creating e-commerce applications. Effective at working in Agile environments using Scrum methodologies. - responsible - meeting deadlines - able to analyze troubles and respond to criticism - striving to exceed customer expectations with cutting edge technology I have experience working in small and big teams. My skills: ▪Backend: Java, OOP ▪Frontend: Angular, HTML, CSS ▪Frameworks: Spring Framework (SpringMVC, Spring Boot, Spring Data, Spring Security) ▪ORM: Hibernate, JPA ▪Testing: JUnit, Mockito, Spy, Captor ▪VCS: Git(GitHub, GitLab) ▪Relational databases: MySQL, PostgreSQL, MongoDB ▪Build automation tools: Maven, Gradle ▪API documentation tools:Swagger ▪Clouds: AWS S3 Bucket, EC2 Instance, RDS Database ▪CI/CD:Jenkins ▪IDE:IntelliJ IDEA ▪Other: REST API, Design Patterns, Log4j 2, Lombok, Thymeleaf, Jakarta Servlet, JSP, JSTL, Groovy, Docker, Docker-compose, Kubernetes, Microservice architecture, Postman, Feign Client, Jmeter, CommerceTools integration Just text me back and let's discuss the details.

🚀 Senior Java Developer with 14+ Years of Experience in Scalable Software Solutions As a Java Developer I specialize in building robust, scalable, and high-performance software systems using Java, Spring Boot, and modern API architectures. 💼 My Expertise: ✅ Java ✅ Spring Boot, Spring Cloud, Spring Security ✅ Microservices Architecture ✅ REST API / OpenAPI / Swagger ✅ SAP Hybris for eCommerce ✅ Frontend with React and Angular ✅ API Development & Integration ✅ Cloud Services – AWS, Docker 🔍 What I Offer as a Java Developer Over the years, I’ve contributed to a wide variety of Java-based projects — from enterprise-level platforms to e-commerce systems — helping clients convert ideas into real, revenue-generating software. I bring not just technical expertise, but also strategic thinking to each Java or Spring Boot-based application I build. ✅ Services I Provide: 🔧 Web & Backend Development (Java, Spring Boot) 🔌 API Design & Integration 🔄 Microservices with Spring Cloud 🛒 SAP Hybris eCommerce Solutions 📊 Custom CRM systems 🌐 Data Scraping and Automation 💻 Full-stack Solutions with Java + React 🧩 Tech Stack: Backend (Java & Spring): ✔️ Java, Spring Boot, Spring Cloud, Spring MVC, Spring Security, Kafka ✔️ REST API, OpenAPI, Swagger, JSON, XML ✔️ Hibernate, JPA, Quartz, Lombok ✔️ Java Concurrency, Servlet, JUnit, Mockito Frontend: ✔️ React, Angular, JavaScript, TypeScript ✔️ TailwindCSS, Bootstrap, HTML, CSS, LESS DevOps & Tools: ✔️ Git, GitHub, GitLab ✔️ Docker, Maven, Gradle, Tomcat ✔️ Postman, SoapUI, AWS (S3, EC2) ✔️ MySQL, MongoDB ✔️ IntelliJ, VS Code, JIRA, Confluence 🤝 Why Work With Me? 🗣️ Transparent communication & detailed Java-based estimates 📈 Focus on maintainable, high-quality Spring Boot code 🧠 Deep understanding of Java API integrations and real-world use cases 🕹️ Able to work independently or as part of a distributed team If you’re looking for a reliable Java Developer who knows how to turn requirements into rock-solid Spring Boot applications — I’d be happy to help. Let’s connect and build something great with Java. 🚀