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💼 8+ Years Building Production-Grade Java Backends for Enterprise & Startups 🤝 Worked with Macy's · Backcountry · Agrobank · Dubai Islamic Bank 🛠️ Spring Boot · Microservices · AWS · PostgreSQL · Docker · React · Full-Stack When It Counts I'm a Senior Java Backend Engineer specializing in building secure, scalable, production-grade systems using Java, Spring Boot, and microservices architecture for enterprise eCommerce, digital banking, and government platforms across the US and UAE. I've built systems serving millions of users at Macy's, delivered nationally regulated banking infrastructure at Agrobank. Every system designed with security, scalability, and long-term maintainability at the core. When the project demands it, I extend into the full stack with React, Next.js, and TypeScript delivering end-to-end without losing the backend focus. 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 Backend (Core): Java · Spring Boot · Spring Security · Spring Cloud · Spring Data JPA · Hibernate · Microservices · REST API · GraphQL · OAuth2 · JWT · Apache Kafka · RabbitMQ · Maven · Gradle · Lombok · Liquibase · Flyway Frontend: React.js · Next.js · TypeScript · JavaScript · Redux · Zustand · React Query · Axios · Tailwind CSS · Material UI · Node.js · Vite Databases: PostgreSQL · MySQL · MongoDB · Redis · Firebase Cloud & DevOps: AWS (EC2, S3, SNS) · Azure · Docker · Kubernetes · CI/CD · GitHub Actions Testing & Docs: JUnit · Jest · Postman · Swagger 𝐖𝐡𝐚𝐭 𝐈'𝐯𝐞 𝐃𝐞𝐥𝐢𝐯𝐞𝐫𝐞𝐝 𝗠𝗮𝗰𝘆'𝘀 | eCommerce Platform Built Java Spring Boot microservices for catalog, promotions, and cart operations serving tens of millions of shoppers annually. Optimized performance through Redis caching and CDN integration, reducing response times across high-traffic retail events including Black Friday. 𝗕𝗮𝗰𝗸𝗰𝗼𝘂𝗻𝘁𝗿𝘆 | Online Retail Platform Developed Java backend services for product catalog, inventory management, and order processing at scale. Implemented Redis caching and CDN integration that cut API response times during peak retail traffic. 𝗔𝗴𝗿𝗼𝗯𝗮𝗻𝗸| Digital Banking Platform Architected the backend microservices layer for a nationally regulated digital banking platform using Java, Spring Boot, and PostgreSQL covering account management, transactions, and financial reporting under strict compliance requirements. 𝗗𝘂𝗯𝗮𝗶 𝗜𝘀𝗹𝗮𝗺𝗶𝗰 𝗕𝗮𝗻𝗸 | Investor Relations Portal Built secure Java Spring Boot backend APIs for one of the world's largest Islamic banks. Delivered financial reporting endpoints with compliance-grade data security for institutional stakeholders. 𝐇𝐨𝐰 𝐈 𝐖𝐨𝐫𝐤 🔹 Architecture designed before a single line of code is written 🔹 Clean, maintainable Java with documentation built in 🔹 Security and scalability from day one, not retrofitted later 🔹 Full ownership from architecture through deployment 🔹 Proactive updates and clear communication throughout I work with modern development tooling and productivity practices to maintain high output and code quality, with rigorous human review and production standards applied to every deliverable, no exceptions. 🚀 𝐋𝐞𝐭'𝐬 𝐓𝐚𝐥𝐤 𝐀𝐛𝐨𝐮𝐭 𝐘𝐨𝐮𝐫 𝐏𝐫𝐨𝐣𝐞𝐜𝐭: Whether you're building a Java backend from scratch, scaling a system that's hitting its limits, or need a full-stack engineer who leads with architecture, I'm here to make it production-ready. Send me a message and let's get started.

Senior Android Developer & Team Lead with 6+ years of experience shipping production apps used by millions of users across Europe and the US. I specialize in Kotlin, Jetpack Compose, and Clean Architecture — and I don't just write code, I own outcomes. At WeShop (Manchester), I led a team of 3 engineers, cut crash rate from 2.8% to 0.6%, improved app startup by 25%, and helped drive 40%+ MAU growth. Before that, I shipped features for 1M+ active users at Glamorous Goat and delivered 7+ full-cycle apps as a freelancer — every engagement rated 5 stars. What I bring to your project: → Kotlin-first development with Jetpack Compose, Coroutines, Flow, Hilt, Retrofit → Offline-first architecture built for real-world conditions → API integration done right — clean, resilient, maintainable → CI/CD with Fastlane + GitHub Actions (release cycles from hours to minutes) → Team lead experience: code reviews, architecture decisions, mentoring $100K+ earned on Upwork · 100% Job Success · 15 jobs · 4,700+ hours Available now. Let's build something great.

Hi👋 Will help you as a Java / Cloud architect, senior developer, and team lead with over 21 years of experience in the area (more than 150 projects delivered). We focus on RELIABLE software, and mission-critical operations, for which we use custom reliability technology for software (EDC), to prevent business downtime. I can help you with: • Cloud applications, scalable systems, • AI and LLM integration and development, • API design, development and integration, • High load/data volumes, predictive analytics, • Software for robots and machinery, • Internet of Things (IoT), • Reliable, safety and mission-critical systems. I 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. Don't take my word for it, please review my profile feedback. Some techs 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: Java 8 and further versions, Spring, JavaEE, JavaFX ✓ Spring: SpringBoot, Spring MVC, Spring Security, Spring Data, ... ✓ Cloud: AWS, Google Cloud, Docker, Kubernetes, ECS, EKS, Cloud-native apps, scalable clusters, zero-downtime deployment. ✓ AI: ChatGPT, LLM, Vertex AI, Chatbots. ✓ Databases: Oracle/PostgreSQL/MySQL, big volume storage (AWS Redshift, AWS Athena/S3, Aurora, Cassandra, HDFS), Redis, MongoDB, Neo4j. ✓ Web: Bootstrap, Angular, React, JavaScript, OAuth, Tomcat, JBoss. ✓ APIs: REST, SOAP, XML-RPC, WebServices, WebSockets, Swagger/OpenAPI 3 etc. ✓ 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, AWS CodeBuild/CodeDeploy. ✓ Other: Maven, Nexus, Gradle, Ant. I get things done.

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

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).