Hire the Best J2EE Developers in Warsaw, PL

I am a skilled Java developer with extensive experience in building high-performance, scalable, and reliable applications. With over 3 years of experience in the industry, I have honed my skills in Java development, including core Java, J2EE, Spring Framework, Hibernate, and Maven.

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.

With a rich background in software development, I specialize in Java and related technologies. My experience spans teaching, back-end development, and architecture, involving diverse projects from large-scale platforms to tailored client applications. Currently, I focus on designing and deploying cloud-based back-end solutions with a specialization in serverless architecture, security, integrations, and databases. I've collaborated with global corporations, provided consultancy services, and freelanced for SMEs and startups. My project portfolio ranges from high-traffic e-commerce applications to data-centric and cutting-edge solutions like low-code platforms and AI-integrated tools. Leveraging my extensive experience, I not only offer technical expertise but also provide valuable business insights to clients, advising on the strategic aspects of their applications. Moreover, I hold AWS certifications and boast a strong educational background with degrees in Computer Science and Organization Management.

Data Scientist with BigData during last 3 years / pure software engineer during another 10 years, 6 years of java. My primary interests is quantitive research / data analysis for algorithmic trading on stocks and all other assets classes / macroeconomic & financial time series forecasting. In my research I am capable to use different machine learning and BigData tools: - deep learning ( neural networks ) powered by Tensorflow - other powerful ML algorithms - boosted decision trees , random forests etc, - grouping/clustering of data - different algos - text analysis - NLP ( parsing / classification of text etc ) - general data analysis - hypothesis testing, feature significance, data parsing etc - BigData platforms like Spark / Hadoop - different popular data analysis languages - python / R / scala / java / bash and sometimes C++ . I have pretty good understanding of financial market mechanics ( e.g. be able to understand sequences like 2008' crisis : subprime mortgages with ARM - high foreclosures rates - derivative price volatility - some fin.institution fail - high bank overnight spreads - liquidity crisis on corp / bank sector - Fed credit easing monetary policy ) . Recently I start actively learn different AlgoTrading resources : Quantopian videos and read more serious academical papers and books on the issue. Strong math skills ( participated and won regional math olympiad while was studing at school ) Industry experience in data analysis for high-loaded low-latency systems in programmatic advertising domain - RTB-systems, ML, AI, NLP etc. Work with datasets up to 10.000 GB . Also I have total 14 years experience working as software developer. During my career I took part in different projects mostly with big US \ EU companies using different technologies / tools for all stages of software life cycle: design, development, testing, task-management bug-tracking, continues integration and so on. I have experience with a lot of java / j2ee stuff. Don't hesitate to contact me if you have / going to have some project/tasks related to Data Science, especially in finances / algorithmic trading domain.