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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 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

Senior Full-Stack Developer • Performance Optimization Expert Java, Kotlin, JavaScript (frontend/backend), C++, Python, PHP, Perl SQL/NoSQL, Web/Desktop apps, Automation, Web Scraping I help companies make their software faster, lighter, and more efficient. 20+ years of hands-on experience in system performance tuning, profiling, solving bottlenecks, and refactoring legacy systems. If your application is slow, unstable, memory-hungry, or needs deep analysis — I can fix it. ⸻ 🧩 My Core Expertise • Performance optimization (Java/JVM, databases, backend services) • Query optimization, memory leak detection, code profiling • Refactoring legacy code, stabilizing old systems • Full-stack development (Java/Kotlin + JS, Python, PHP, Perl, C++) • Web automation & scraping • Systems analysis, debugging, complex issue resolution ⸻ 🚀 What I Deliver • Faster request processing • Reduced memory & CPU usage • Significantly improved database performance • Clean, maintainable, well-structured code ⸻ 🤝 Availability Open to long-term or part-time collaboration (30–40 h/week). Also interested in innovative startups: your idea — my implementation. ⸻ Let’s make your software fast, stable, and scalable!

Highly accomplished Software Architect and Machine Learning Engineer with a solid mathematical background and 20+ years of experience. I specialize in bridging the gap between complex algorithmic research and high-performance system execution. My unique expertise combines advanced AI/ML development with a deep background in compiler design, domain-specific languages (DSLs), and low-level code optimization. Whether you need to develop production-grade ML models, optimize heavy computing algorithms, or build specialized software tools and custom IDEs, I deliver mathematically sound and architecturally robust solutions. 🧠 Core Expertise Machine Learning & Research: Algorithm development, statistical data processing, predictive modeling, and AI logic orchestration. Strong scientific and analytical background with proven experience in research and academic article writing. Compilers & DSL Engineering: Expert in the theory of formal languages, syntax analysis, parsers, and custom compilers. Prototyping and implementing Domain-Specific Languages (DSLs) tailored for specific business or technical domains. High-Performance & Optimization: Optimization of complex calculations, data structures, and database architectures for high-throughput systems. Full-Cycle Infrastructure: Designing client-server systems for massive data storage, visualization of observation results, and custom developer tools (Eclipse RCP/Xtext/Plugin development). TECHNICAL SKILLS SUMMARY 🤖 Machine Learning & Mathematics Algorithms & Math: Advanced Mathematics, Algorithm Design & Optimization, Statistical Analysis, Data Visualization. AI Logic: Neural Network integration, Data Processing pipelines, Game AI & Logic engines. Research: Scientific research, Data insights, Technical writing, and Academic publication standards. 🛠️ Compiler & DSL Development Formal Languages: Syntax Analysis, Parser Generation, AST Manipulation. Tools & Frameworks: Xtext, Xtend, ANTLR. IDE Development: Eclipse RCP, SWT/JFace, Custom Plugin Development. ☕ Enterprise Java & Backend Infrastructure Core Java: Java SE (High Performance), Java Reflection, Sockets/Networking. Frameworks: Spring (Core, MVC, AOP), Hibernate, JDBC. Data Processing: SAX, DOM, XSLT, Jasper Reports. Databases: PostgreSQL, MySQL. 📱 Legacy & Specialized Experience Desktop/Web UI: Swing, GWT, GXT. Cross-Platform & Graphics: LibGDX (Game engines/logic). Legacy Stack (ActionScript/Flex): Flex 4.6, ActionScript 3.0, Adobe AIR, Flash Media Server, PureMVC (valuable for legacy system migration). ⚙️ Tools & Workflow IDEs: IntelliJ IDEA, Eclipse. Build & Version Control: Maven, GIT, SVN. Architecture: Gang of Four (GoF) Design Patterns, Clean Architecture.

I am a seasoned software developer with over 10 years of experience specializing in Backend and Full-Stack development. I pride myself on my excellent problem-solving skills and have a strong passion for writing clean and testable code. Clear communication is one of my strengths, making me a valuable team member in any software development project. Preferred Tech Stack: Backend: Java, Spring Boot, Thymeleaf, REST API, PostgreSQL, AWS, Linux, Tomcat, Nginx Frontend (Web): HTML, CSS, Sass, Javascript Frontend (Mobile): Flutter, Dart Cross-Platform: Flutter, Dart I am also proficient in the following technologies: Languages: Java, Scala, Groovy, Kotlin, Golang, JavaScript, TypeScript, Python, Dart, SQL Databases: PostgreSQL, MySQL, Oracle, Cassandra, MongoDB, SQLite, Neo4j Frameworks (Backend): Spring Boot, Spring Security, OpenAPI, Kafka, Zookeeper, Grails Frameworks (Frontend): Angular, React, Flutter, jQuery, Bootstrap Security: Spring Security, OAuth, JWT Technologies: HTML, CSS, JSON, XML, REST API API: REST API, OpenAPI, Swagger Messaging: Kafka, ActiveMQ, RabbitMQ Search: ElasticSearch, Lucene, Kibana Logging: ElasticSearch, Logstash, Kibana Cloud Providers: AWS, Google Cloud Testing: JUnit, Mockito, TestNG, Selenium, Cucumber, Katalon Studio Development Tools: Intellij IDEA, VSCode, Android Studio

Greetings! I have been working as a Java developer for more than 14 years, my main clients are from Europe, Israel, India, China and USA. I am developing both desktop software and web applications, RESTful microservices etc. You can safely entrust me with the work on your project and will never be disappointed in our cooperation, I can guarantee the high responsibility and quality of the tasks that I carry out, which you can be sure of when you take me to your team. Main skills: Java technologies: - Java 8, 9, 11, 17 - JavaFX - Zuul, Ribbon, Eureka - Spring: Core, MVC, Web-flow, Integration, Batch, Boot, Social, Data, Config - Quarkus - Maven 2/3, JUnit 4 - JMS: RabbitMQ, ActiveMQ - JDBC, Hibernate 3.x, Neo4j - ESB, JNDI, JSP - WebDriver - JHipster NodeJS development: assisting libraries: express, async, soap, log4js connectivity: mongodb, redis, stomp-client, socket-io testing, building: should, mocha, grunt deployment: PM2, npm publishing and related activities promises, some EcmaScript 6 thingies Front-end development: Angular HTML 5, CSS 3, JavaScript (ES 5/6) JQuery, Bootstrap Other: pug (jade) Datastores: MySQL, MongoDB, PostgreSQL Other: AWS, Google Cloud, Azure services: Compute Engine, Cloud Storage, Data Store, SQL regular usage of Linux-based systems (anything necessary to develop and support software) infrastructure: Jenkins, SVN, git - commit/push/pull level ActiveMQ, Camel Elasticsearch

Nordic Bluetooth, Zephyr, nRF Connect SDK, nRF Mesh, Cypress/Infineon BT/WiFi, STM32, Silabs, Espressif ESP32, NEC/Renesas/Dialog, Atmel/Microchip, Arduino preferably. C/C#/Python Have over 11 years of professional experience in electronics development, embedded systems, hardware design, IoT. In past I have worked for prosperous Startup, manufacturer company and have designed electronics products from scratch to mass production. Experienced in development and testing of embedded systems. MCU: Nordic nrf52 BT SoC. Espressif ESP32 WiFi BT. Cypress/Infineon PSoC6 BT/WiFi WICED ST STM32 F0, L4, L4+ Cortex-M0-M4. ST Bluetooth 5 BLUENRG-2 SiLabs (Energy Micro) EFM32 ARM Cortex-M3 Atmel AT90S, ATtiny, ATMEGA, XMEGA.. Microchip 12F, 16F, 18F. Renesas/Dialog (Nec) 78k. DA. Rockchip. Development Tools - Eclipse - IAR - CodeVisionAVR - Keil µVision IDE. - Visual Studio - Altium - GCC - CCS C Compiler - Arduino VERSION CONTROL/BAG TRACKING - SVN - Git - Jira - Asana