Hire the Best JSP Developers
in Poland

I build products from idea to a working app, and I fix and grow existing ones — especially where the product and data flows are complex. I freelanced here from 2009, then spent 13 years on Upwork's engineering team, building reporting, time tracking and paid-plan features. Recently I built DiaPilot, an Android app, from scratch (open source), and I work on a production platform for an animation studio. Hands-on: TypeScript, Vue/Nuxt, Node.js, PHP (Symfony), SQL, GraphQL. With AI coding agents: React/Next.js, Python/FastAPI, Kotlin/Android — the architecture, review and tests are mine. Good fit: turning an idea into a first real version, taking over a half-finished or AI-built app, or improving a product that already has users. Send me a short description of your idea or your app, and I'll reply with how I'd approach it.

𝟭𝟳𝟬 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀. 𝟮𝟮 𝘆𝗲𝗮𝗿𝘀. 𝗕𝘂𝗶𝗹𝘁 𝘁𝗼 𝘀𝗰𝗮𝗹𝗲. 𝗕𝘂𝗶𝗹𝘁 𝘁𝗼 𝗽𝗲𝗿𝗳𝗼𝗿𝗺. 𝗕𝘂𝗶𝗹𝘁 𝗳𝗼𝗿 𝗴𝗿𝗼𝘄𝘁𝗵. 🔥 𝐅𝐫𝐞𝐞 𝟐𝟎 𝐡𝐨𝐮𝐫𝐬 𝐨𝐟 𝐩𝐥𝐚𝐧𝐧𝐢𝐧𝐠 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐧𝐞𝐰 𝐩𝐫𝐨𝐣𝐞𝐜𝐭 (DM "Free") 🔥 𝐅𝐫𝐞𝐞 𝐜𝐨𝐝𝐞 𝐫𝐞𝐯𝐢𝐞𝐰 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐞𝐱𝐢𝐬𝐭𝐢𝐧𝐠 𝐩𝐫𝐨𝐣𝐞𝐜𝐭 (DM "Free") Main focus: ✅𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐖𝐞𝐛 & 𝐒𝐚𝐚𝐒 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: build production-ready web applications, SaaS platforms, customer/admin portals, dashboards and complex business systems from A to Z with Java, Spring Boot, Spring Cloud, Angular, React, REST APIs, PostgreSQL/MySQL, AWS, Docker and Kubernetes. ✅𝐂𝐨𝐦𝐩𝐥𝐞𝐱 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 & 𝐀𝐏𝐈 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: design scalable backend architecture, business logic, APIs, WebSockets, data hubs, gateways and third-party integrations using Java, Spring Boot, REST, SOAP, OAuth and event-driven technologies. ✅𝐀𝐈 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 & 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧: embed AI-powered features into SaaS and business software using Claude, Codex, MCP, RAG, Vertex AI and Spring AI for analytics, automation, predictive systems and AI over business data. ✅𝐂𝐥𝐨𝐮𝐝 & 𝐒𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬: architecture and development of cloud-native, serverless and scalable applications using AWS, GCP, Docker, Kubernetes, ECS, EKS, Lambda, RDS, SQS/SNS and zero-downtime deployment. ✅𝐑𝐞𝐥𝐢𝐚𝐛𝐢𝐥𝐢𝐭𝐲 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐢𝐧𝐠: structured review of your application, architecture, AWS infrastructure, deployment process, monitoring, APIs and operational dependencies, followed by a prioritized remediation roadmap. ✅𝐏𝐎𝐒 𝐚𝐧𝐝 𝐌𝐮𝐥𝐭𝐢-𝐒𝐭𝐨𝐫𝐞 𝐂𝐨𝐦𝐦𝐞𝐫𝐜𝐞: POS, KDS, checkout, payments, 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 using AWS IoT, MQTT, data streaming and cloud analytics. ✅𝐉𝐚𝐯𝐚 𝐄𝐜𝐨𝐬𝐲𝐬𝐭𝐞𝐦 𝐌𝐨𝐝𝐞𝐫𝐧𝐢𝐳𝐚𝐭𝐢𝐨𝐧: modernize Java-based enterprise systems in controlled stages using Java, Spring, Spring Boot, EJB, Oracle, WebLogic, WebSphere and JBoss/WildFly while preserving critical business functionality. ✅𝐄𝐧𝐭𝐞𝐫𝐩𝐫𝐢𝐬𝐞 𝐒𝐨𝐟𝐭𝐰𝐚𝐫𝐞 𝐑𝐞𝐬𝐜𝐮𝐞: 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 =============== ✓ Full-Stack Web: Java, Spring Boot, Spring Cloud, Angular, React, JavaScript, Bootstrap, OAuth. ✓ Java/Spring: Spring Boot, Spring MVC, Spring Web, Spring Security, Spring Data, Spring AI. ✓ Java/JavaEE: EJB, JSP/JSF/RichFaces, Oracle ADF, JavaFX. ✓ APIs & Integrations: REST, SOAP, XML-RPC, WebServices, WebSockets, Swagger/OpenAPI. ✓ Cloud: AWS, Google Cloud, Docker, Kubernetes, ECS, EKS, cloud-native apps, scalable clusters, zero-downtime deployment. ✓ AI: Codex, Claude, MCP, RAG, Vertex AI, Spring AI. ✓ Databases: Oracle, PostgreSQL, MySQL, PL/SQL, AWS RDS, Aurora, Cassandra, Redis, MongoDB, Neo4j, HDFS, S3/Parquet, JPA, custom ORMs. ✓ AWS: EC2, Kinesis, Athena, Redshift, DynamoDB, Lambda, IoT, SQS/SNS, CloudFront, Route53, API Gateway. ✓ Data streaming: AWS Kinesis, Firehose, SQS/SNS, Kafka, Camel, RabbitMQ. ✓ Servers: Tomcat, WebLogic, JBoss/WildFly, WebSphere. ✓ 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, Workflow Automation, Performance Optimization, QA Automation. 𝐑𝐞𝐚𝐝𝐲 𝐭𝐨 𝐛𝐮𝐢𝐥𝐝? 𝐌𝐞𝐬𝐬𝐚𝐠𝐞 𝐦𝐞 - 𝐥𝐞𝐭’𝐬 𝐠𝐞𝐭 𝐢𝐭 𝐦𝐨𝐯𝐢𝐧𝐠.

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).

If we work, you can count on me. I: - ensure clear communication; - pay attention to details; - strive to deliver in the shortest timeframe. Top technologies I like and use often: Frontend - Redux, RTK, SWR, Apollo GraphQL Client - Next.js (App & Pages), CRA, React Router - CSS Modules, Tailwind CSS & UI, Headless UI - Storybook, Testing Library, Jest, MSW - PNPM, Yarn & Workspaces, Lerna, Nrwl Nx Backend: Node.js - NestJS (RESTful & GraphQL APIs) - TypeORM, Prisma - Apollo GraphQL Server Backend: Go (Golang) - PGX, GORM, GoRedis - Gorilla, Gin - Protocol Buffers (Protobuf), gRPC - Temporal Platform & Go SDK DevOps: Automation tools - Docker & Compose - GitHub Actions DevOps: Infrastructure - DBs: Redis, Postgres, Mongo, Neo4j - PaaS: DO, AWS, Heroku, GCP, Vercel, Appflow

Hello there! My name is Yurii and I am a certified Google Cloud Architect and Engineer passionate in Cloud development and Java. I have more than 10 years of commercial enterprise development experience in Java working as a Senior Java Developer and leading a small but efficient team. During my career, I had developed multiple services and applications from desktop apps to huge standalone web applications and micro-service-based platforms for image processing, studying, etc. A brief summary of my expertise could be found below. Programming Languages: Java, JavaScript, TypeScript, Python Main Technologies: Java SE, Java EE, Spring, Hibernate, JSP, Servlets, AspectJ, AngularJS, Django, Flask Testing frameworks: JUnit, Mockito, Spock, Geb, Selenium, PowerMock IDE: Eclipse, NetBeans, IDEA Application servers: Tomcat, WebLogic, Glassfish, Jetty OS: Windows, UNIX DBMS: Oracle, Apache Derby, MySQL, SQLite Build Tools: Maven, Ant, ivy, gradle Version Control System: Subversion, git Management Tools: JIRA, Confluence, Gerrit, ZenHub, GitHub Additional skills: technical documentation writing, knowledge transferring CI/CD: Jenkins

I specialize in automating and optimizing your core business processes, particularly across sales and finance. My focus is on connecting critical platforms like your CRM (HubSpot/Pipedrive) with finance software (QuickBooks/XERO), and any other API-enabled software you rely on. Having automated entire departments in my own ventures and worked with global giants like Bosch & Siemens, I empower businesses to achieve similar efficiencies, saving hundreds of hours and significantly cutting costs. ——— Longer version ——— I'm a software engineer with a master's in economics and deep business expertise, specializing in Sales & Finance automation and all kinds of software integrations. Before automating entire departments (sales, finance, recruitment) in my own businesses and cutting costs by up to 70%, I led software development for companies ranging from small North American family businesses to global giants like Bosch & Siemens. This hands-on experience allows me to design solutions that are not just technically sound but strategically aligned with your business goals. I don't just "connect apps"; I create lean, reliable, and scalable systems built to grow with your team. I've developed a large library of automation blueprints that allow me to quickly adapt solutions for your exact needs. My Core Focus Areas: 📊 Optimizing CRM Data & Workflows: HubSpot migrations and integrations with finance and lead generation platforms; auto-triggered follow-up workflows based on stage or client behavior. 💰 Streamlining Financial Workflows: QuickBooks/XERO automation for invoicing, reconciliation, salary calculation, and payroll; API-based syncing with CRMs and payment systems. 🔗 Custom API Integrations: Syncing CRM data with finance, marketing, and operations tools. Multi-step processes with n8n that completely replace manual tasks. 🤖 AI for Operations: Implementing AI-backed email agents for enhanced productivity; virtual helpdesks; anomaly and error detection in financial data; automated transaction classification. 📈 Reporting & Dashboards: Automating reports and creating custom dashboards for real-time insights into cash flow and expenses. 🚦 "Human in the Loop" Flows: Adding approvals for sensitive operations to maintain control where needed. Looking to optimize your business processes? Let's connect and explore how we can transform your operations. 🚀