Hire the Best Java EE Developers
in Poland

Over the last 15 years, I have developed a wide range of applications using Java technologies. Spring / Spring Boot, Hibernate JSP, JSF, Apache Wicket, Apache Struts HTML.CSS, JavaScript, jquery, mySql, postgreSQL, Oracle. My skills are confirmed by certifications: VMWare Spring Certified Profesional OCP (Oracle Certified Professional Java SE 17) SCJP (Sun Certified Java Programmer) SCWCD (Sun Certified Web Component Developer).

"Working with Andriy was awesome. He helped me out with some bugs on my REACT/NODE website. He completed a task quickly and surprised me with excellent skills. He is a master in his domain, so in case you need a freelancer, Andriy is an A+++ recommendation. Superb!"   - Andrei C. ――――――――――――――――――――――――――――――――――――  • Do you want new shiny website filled with rich functionality?  • CMSs aren't flexible enough for you, you need more features?  • You need someone to figure out and update complex project?  • Interested in custom enterprise solution? Then contact me and I will turn your ideas into reality. Over ten years developing commercial software gives me the insight into implementing robust, secure and maintainable software. Healthcare and finance industries are not foreign to me. Also I can do for you:  ✔ Database development  ✔ DevOps tasks, such as CI/CD, deployments and automation (see my specialized profile)  ✔ Organizing other developers work I'm attentive to details and like to get the job done right. I specialize in React/NodeJS/JavaScript. ―――――――――――――――――――――――――――――――――――― Some of my skills: Programming languages:  • JavaScript  • TypeScript  • C#  • PHP  • Java Frontend:  • React (+Next.js) - with SPA and Server-side rendering  • Redux for JavaScript  • HTML/CSS  • jQuery, Twitter bootstrap  • SPA frameworks (AngularJS, Durandal, Aurelia)  • Universal applications (Server-side rendering)  • CKEditor Backend:  • NodeJS (including Express)  • ASP.NET, ASP.NET MVC, ASP.NET Web Api  • Firebase Databases:  • MySQL  • MS SQL Server  • Oracle  • MongoDB Integrations:  • Google Analytics  • New Relic  • Twitter  • Facebook APIs  • Some AWS (Cognito, API Gateway) Desktop:  • .NET Windows Forms VCS:  • Git  • SVN  • Mercurial Scripting:  • Bash  • Microsoft batch files Other:  • Internet security  • Cryptography  • Vim  • Applied Mathematics background  • GraphQL (+Relay)  • Functional Programming

I am a full stack developer with experience in building medium and enterprise web applications. I’m experienced in Java, JavaEE, Spring, HTML/CSS/JS, React, JPA, Databases Also I have some experience Docker, RabbitMQ, ELK stack, I’ll fully project manage your brief from start to finish Regular communication is really important to me, so let’s keep in touch!”

Hey👋 == 𝟮𝟮 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 𝗫𝗣. 𝟭𝟕𝟬 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀. 𝟭𝟬𝟬% 𝘀𝘂𝗰𝗰𝘀𝗲𝘀 𝗿𝗮𝘁𝗲. == ✔𝐅𝐫𝐞𝐞 𝟐𝟎 𝐡𝐨𝐮𝐫𝐬 𝐨𝐟 𝐩𝐥𝐚𝐧𝐧𝐢𝐧𝐠 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐧𝐞𝐰 𝐩𝐫𝐨𝐣𝐞𝐜𝐭 (DM "Free") ✔𝐅𝐫𝐞𝐞 𝐜𝐨𝐝𝐞 𝐫𝐞𝐯𝐢𝐞𝐰 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐞𝐱𝐢𝐬𝐭𝐢𝐧𝐠 𝐩𝐫𝐨𝐣𝐞𝐜𝐭 (DM "Free") Main focus: ✅𝐑𝐞𝐥𝐢𝐚𝐛𝐢𝐥𝐢𝐭𝐲 𝐞𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐢𝐧𝐠: structured review of your application, architecture, AWS infrastructure, deployment process, monitoring, and operational dependencies, followed by a prioritized remediation roadmap. ✅𝐏𝐎𝐒 𝐚𝐧𝐝 𝐌𝐮𝐥𝐭𝐢-𝐒𝐭𝐨𝐫𝐞 𝐂𝐨𝐦𝐦𝐞𝐫𝐜𝐞: POS, KDS, checkout, payment, catalog, ordering, inventory, loyalty, reporting, and multi-store commerce software for businesses operating across physical locations and online storefronts. ✅𝐈𝐨𝐓 𝐅𝐥𝐞𝐞𝐭 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭: build secure IoT, telemetry, remote diagnostics, and predictive maintenance platforms for manufacturers, service teams, and operators managing connected devices at scale. ✅𝐉𝐚𝐯𝐚 𝐄𝐜𝐨𝐬𝐲𝐬𝐭𝐞𝐦 𝐌𝐨𝐝𝐞𝐫𝐧𝐢𝐳𝐚𝐭𝐢𝐨𝐧: modernizes Java-based enterprise systems in controlled stages, including EJB applications, Oracle products, application servers, while preserving critical business functionality. ✅𝐄𝐧𝐭𝐞𝐫𝐩𝐫𝐢𝐬𝐞 𝐒𝐨𝐟𝐭𝐰𝐚𝐫𝐞 𝐑𝐞𝐬𝐜𝐮𝐞: help companies take over, understand, stabilize, and safely continue development of complex Java, Spring, and AWS systems when the existing team, architecture, or delivery process is no longer reliable. ================================================ WE 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. ================= Some tech 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/Spring: SpringBoot/Spring Cloud/Spring Web/Spring AI/Spring Security/Spring Data etc. ✓ Java/JavaEE: EJB, JSP/JSF/RichFaces/Oracle ADF, JavaFX ✓ Spring: SpringBoot, Spring MVC, Web, Security, Data, AI ... ✓ Cloud: AWS, Google Cloud, Docker, Kubernetes, ECS, EKS, Cloud-native apps, scalable clusters, zero-downtime deployment. ✓ AI: Codex, Claude, MCP, RAG, Vertex AI. ✓ Databases: Oracle/PostgreSQL/MySQL, PL/SQL, AWS RDS, big volume storage (AWS Redshift, AWS Athena/S3, Aurora, Cassandra, HDFS), Redis, MongoDB, Neo4j, S3/Parquet, JPA, custom ORMs. ✓ Web: Bootstrap, Angular, React, JavaScript, OAuth. ✓ Servers: Tomcat, Weblogic, JBoss/Wildfly, Websphere. ✓ APIs: REST, SOAP, XML-RPC, WebServices, WebSockets, Swagger/OpenAPI. ✓ 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, GitHub Actions, AWS CodeBuild/CodeDeploy. ✓ Other: Maven, Nexus, Gradle, Ant. We get things done.

About Love programming, have backend experience and am always open to learning new technologies. Like to share my experience, talk about clean architectures and programming solutions.

Experienced backend Java developer with over a decade of expertise in developing and maintaining high-quality software solutions. My career includes roles at Accenture, Credit Suisse and GFT Group. Based in Poland, I have also worked in London with Luxoft and Unibet, a leading company in the gambling industry. Top-rated Upwork freelancer, ranked in the top 5% of performers with a 100% Job Success Score. Proficient in Java, Spring Boot, REST APIs, and cloud technologies (AWS). Adept at working with distributed international teams, emphasizing clean code practices and delivering challenging projects. Programming Languages: Java, JavaScript, Scala APIs & Integrations: RESTful APIs, GraphQL, WebSocket, RabbitMQ, JMS, Kafka Cloud & DevOps: AWS (Cloudformation), Docker, CI/CD (Jenkins, GitHub Actions) Frameworks & Tools: Spring Framework, Spring Boot, Hibernate, JPA Version Control: Git, GitLab, Bitbucket Databases: MySQL, PostgreSQL, MongoDB, Redis Testing: JUnit, Mockito, Cucumber, TDD Others: Observability, Keycloak, Angular, Maven, Bash