📢 Available for new projects 📢 I am a Senior Backend Developer with over 10 years of commercial experience, focused on building scalable, secure, and high-performance backend systems that power modern web and mobile applications. As a dedicated professional, I work with complex architectures where reliability, performance, and long-term maintainability are critical. I help businesses transform ideas into robust products by applying proven software engineering practices and deep expertise in backend development, cloud infrastructure, and system design. My primary focus is backend development using Node.js, TypeScript, PostgreSQL, and cloud-native technologies. I specialize in designing APIs, microservices, distributed systems, and scalable data architectures capable of supporting growing products and high user loads. Alongside strong backend expertise, I have solid Full Stack experience. This allows me to efficiently collaborate across the entire product lifecycle, from database design and server-side logic to frontend integration and user-facing features. I understand how all layers of an application work together, enabling balanced technical decisions and faster product delivery. Throughout my career, I have worked across Fintech, AI, EdTech, Healthcare, and Retail industries. I’ve contributed to SaaS platforms, enterprise systems, and custom software solutions, consistently maintaining high engineering standards and delivering reliable business outcomes. My Go-To Tools: Backend: Node.js, TypeScript, NestJS, Express.js Databases: PostgreSQL, MongoDB, Redis Cloud & DevOps: AWS, Docker, Kubernetes, CI/CD Architecture: REST APIs, GraphQL, Microservices, Event-Driven Systems Frontend (Full Stack): React, Next.js, JavaScript, TypeScript Design & Collaboration: Figma, Agile, Product Development 💬 I am ready to start work right now — just drop me a message!

I'm a dedicated Full Stack Developer with over 5 years of experience, passionate about building functional and user-friendly mobile and web applications. My professional background, including work for financial institutions, has given me a solid foundation in developing reliable software solutions. Whether you need assistance with developing robust backend systems, crafting engaging user interfaces, or connecting the two for a seamless application, I'm ready to help bring your project ideas to life. My technical toolkit includes: Backend Development: Java, Spring Boot, building RESTful APIs. Frontend Development: React, JavaScript, HTML5, CSS3, creating responsive designs. Key Practices: Using Git for version control, applying Agile methods, and focusing on quality with testing. I believe in clear and friendly communication to make sure we're always on the same page. Let's chat about your project and see how my skills can contribute!

𝐖𝐡𝐚𝐭 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 𝐚𝐫𝐞 𝐬𝐚𝐲𝐢𝐧𝐠: ⭐⭐⭐⭐⭐"𝐑𝐚𝐧𝐚 came up to speed early, and helped out with some critical code." ⭐⭐⭐⭐⭐"𝐑𝐚𝐧𝐚 was a pleasure to work with. He delivered high-quality work on a tight timeline, communicated clearly throughout the project, and consistently brought a positive, solutions-oriented attitude. He showed strong technical skills and was proactive in solving issues and suggesting enhancements. 𝐋𝐨𝐨𝐤𝐢𝐧𝐠 𝐟𝐨𝐫𝐰𝐚𝐫𝐝 𝐭𝐨 𝐰𝐨𝐫𝐤𝐢𝐧𝐠 𝐰𝐢𝐭𝐡 𝐑𝐚𝐧𝐚 𝐚𝐠𝐚𝐢𝐧 𝐨𝐧 𝐟𝐮𝐭𝐮𝐫𝐞 𝐩𝐡𝐚𝐬𝐞𝐬 𝐨𝐟 𝐭𝐡𝐞 𝐩𝐫𝐨𝐣𝐞𝐜𝐭! ⭐⭐⭐⭐⭐"𝐑𝐚𝐧𝐚 is quick to understand requirement, fast developer, great communication. Got great sense of humor and flexible to deliver on strict deadlines. He has everything one would look for in a seasoned developer. 𝐇𝐢𝐠𝐡𝐥𝐲 𝐫𝐞𝐜𝐨𝐦𝐦𝐞𝐧𝐝𝐞𝐝." ⭐⭐⭐⭐⭐"𝐁𝐫𝐢𝐥𝐥𝐢𝐚𝐧𝐭 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫" As a 𝐒𝐞𝐧𝐢𝐨𝐫 𝐉𝐚𝐯𝐚 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 with over 9 years of hands-on expertise in designing and developing robust enterprise applications across a variety of industries, including 𝐌𝐢𝐜𝐫𝐨𝐟𝐢𝐧𝐚𝐧𝐜𝐞 𝐁𝐚𝐧𝐤𝐢𝐧𝐠, 𝐂𝐨𝐦𝐦𝐞𝐫𝐜𝐢𝐚𝐥 𝐁𝐚𝐧𝐤𝐢𝐧𝐠, 𝐅𝐢𝐧𝐭𝐞𝐜𝐡, 𝐄-𝐂𝐨𝐦𝐦𝐞𝐫𝐜𝐞, 𝐚𝐧𝐝 𝐄𝐑𝐏 𝐬𝐲𝐬𝐭𝐞𝐦𝐬. Holding a Bachelor of Science (BS) degree in Computer Software Engineering, I possess a deep technical foundation and a solution-oriented mindset that drives project success. Throughout my career, I have demonstrated strong leadership capabilities, thriving both as a proactive team leader and a collaborative team player. I excel in guiding high-performing, dedicated teams toward achieving project goals, consistently delivering exceptional results even in high-pressure, complex environments. My ability to think innovatively, coupled with strong time management and organizational skills, has enabled me to deliver scalable, high-quality solutions within tight deadlines. I am deeply passionate about leveraging my technical expertise to drive meaningful technological advancements and contribute to cutting-edge projects. I am now seeking an opportunity to join a forward-thinking software firm where I can further enhance my impact by leading teams, spearheading challenging initiatives, and driving innovation in software development. 𝐊𝐞𝐲 𝐭𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬: ✅ ERP, E-Commerce, FinTech, and Financial Systems Domain ✅ Corporate Banking, Retail Banking, and Microfinance Banking ✅ Microservices development ✅ Java, Python ✅ Spring boot, Spring cloud ✅ Docker and Kubernetes ✅ MySQL, MongoDB, PostgreSQL, Oracle, MS SQL ✅ JSP, JSP, jQuery, JavaScript, Angular ✅ Redis, EH ✅ Elasticsearch ✅ RabbitMQ, IBM MQ, Apache Kafka, Solace ✅ Spring Security ✅ Maven, Gradle ✅ WebSocket ✅ Jenkins ✅ GraphQL ✅ Test Containers ✅ CI/CD ✅ Open AI API ✅ Open shift containers 𝐊𝐞𝐲 𝐐𝐮𝐚𝐥𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬: ⭐ Expert understanding of Java and Python technologies ⭐ Understand the needs of companies of any scale ⭐ Development of software, systems, and web apps ⭐ High-performance, maintainable, and reusable code ⭐ 9+ years of experience ⭐ Self-starter, hard worker, organized, attentive to details, and a team player ⭐ Good communication skills 𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀:🖥 Java EE, Java SE, Senior Developer, Consultant, Enterprise Java, Software Engineer, Backend Development, Enterprise Applications, Java Programming, Java Development, Software Consultant Java Architect, Enterprise Solutions, Full Stack Java, Senior Consultant, Java Expert, Java SE Developer, Java EE Developer, Senior Java Developer, Java Consultant, Software Development Java Technologies, Java Frameworks, Java EE Frameworks, Java SE Frameworks, Java SE Specialist, Java EE Specialist, Java Application Developer, Java Software Engineer, Java Development Specialist, Java Solutions Architect, Java Solution Consultant, Java System Analyst, Java Project Manager, Java Team Lead, Java Technical Lead, Java Design Patterns, Java Code Optimization, Java Performance Tuning, Java Integration, Java API Development, Java Microservices, Java Web Development, Java Application Design, Java Deployment, Java Testing, Java Documentation, Java Best Practices, Java Debugging, Java Troubleshooting, Java Code Review, Java Version Control, Java Security, Java Scalability, Java Reliability, Java Maintenance, Java Enhancement, Java Upgrades, Java Migration, Java Support

I am a skilled Spring Boot developer with over 4+ years of experience in the technology industry. I am proficient in a wide range of technologies, including: - Back-end development: Spring Boot - Front-end development: HTML, CSS, JS - Database: Oracle, MySQL, PostgreSQL - DevOps: GitHub Actions, Git Lab, Jenkins, Docker - Programming Languages: Java, Python, JavaScript I am a highly motivated and results-oriented individual with a proven track record of success in delivering high-quality software. I am also a team player who is willing to communicate and resolving conflicts. I am confident that I have the skills and experience that you are looking for in a backend developer. I am eager to learn new technologies and I am always looking for ways to improve my skills. I am also a quick learner, and I am confident that I can quickly ramp up on any new project.

I’m a highly skilled Senior Full-Stack Developer with 14+ years of experience designing, developing, and managing enterprise-level applications. My goal is to utilize my knowledge, skills, and abilities to improve software performance and deliver high-quality solutions that meet customer needs through collaboration with talented engineers. I strive to deliver quality software while ensuring better performance in development. I have extensive expertise in leading the architecture and development of enterprise applications. I use AI-powered tools and modern technologies to speed up development, improve code quality, and deliver faster results. By integrating AI into workflows, I help businesses reduce development time, boost performance, and launch products quickly. I am dedicated to delivering solutions that go beyond expectations, with a strong focus on performance, efficiency, and continuous improvement. 👉Core Technical Expertise ➡️ Backend Expertise I design and build high-scale, reliable, production-grade systems with full ownership of architecture, performance, and security. ✅ Core Technologies 🔹Node.js (NestJS), Java (Spring Boot, Hibernate), .NET Core 🔹Build low-latency, high-throughput systems with clean architecture ✅ Distributed Systems & Architecture 🔹Design microservices & monolithic systems for scalability 🔹Strong understanding of scalability, fault tolerance, and system design 🔹Experience with high-traffic and real-time systems ✅Security & Data Protection 🔹Implement JWT, OAuth2, RBAC 🔹Apply secure coding and encryption practices ✅Data & Performance 🔹PostgreSQL, MSSQL optimization 🔹ORM: Hibernate, LINQ, Prisma, TypeORM, Mongoose, Sequelize 🔹Focus on caching and performance tuning ✅ Engineering Excellence 🔹Clean architecture, SOLID principles 🔹Testing, debugging, code review, monitoring 🔹Scalable, maintainable code ✅Additional Experience 🔹Eclipse RCP desktop apps 🔹AI integration for automation and efficiency ➡️ Frontend & UI Development I build modern, responsive, high-performance applications with a strong UX focus. ✅Core Technologies React, Angular, Next.js, Vue.js ✅UI Architecture & Design 🔹Design component-based, scalable frontend systems 🔹Strong in responsive design, cross-browser compatibility, and accessibility 🔹Create intuitive UI aligned with business goals ✅UI Frameworks & Styling 🔹Quasar, Vuetify, Material UI 🔹Build clean, consistent, visually appealing UI ✅Performance Optimization Optimize for fast load times, SEO, and smooth interactions. Use lazy loading, code splitting, and efficient rendering ✅AI-Enhanced UI Development Use AI tools to speed up development and improve UI quality. Implement personalisation and data-driven improvements ✅Engineering Excellence Focus on clean code and reusable components. Experience in testing, debugging, and monitoring Build scalable, maintainable frontend solutions ➡️ Mobile Application Development 🔹Native: Java, Kotlin, Swift 🔹Cross-platform: React Native, Xamarin 🔹App Store & Play Store deployment ➡️ Databases & ORM MongoDB, MySQL, PostgreSQL, MSSQL, Oracle, Firebase, SQLite ➡️ API Design & Integrations Build RESTful APIs with clear contracts, versioning, and backward compatibility Integrate with external services, payment systems, and third-party APIs while ensuring resilience and observability Manage complex application states using modern state management libraries Integrate frontend applications with REST APIs and third-party services efficiently 👉Domain Expertise : Healthcare |E-commerce |E-Governance |E-learning |Social Networking |SaaS |PaaS |CRM |Lead Generation |Survey |Games |Accounting |IT Networks |Cloud Computing |E-Education |Retail |Advertisement |Hotel Management |Finance |Forex |Trading |Stock Exchange |Real Estate |Insurance |Payment Technology |Food Industry |Business Appointments 👉 Project Management & Tools 🔹 Agile Delivery Work in Agile/Scrum for smooth, flexible, on-time delivery with continuous improvement 🔹 Issue Tracking & Debugging Use Jira, Bugzilla, and Mantis to track, manage, and resolve issues with focus on code quality 🔹 Version Control & Collaboration Manage code using Git and SVN for secure, structured team collaboration 🔹 API Development & Testing Design, test, and manage APIs using Postman for reliability and performance 👉Why Choose Me? 🔹 End-to-End Ownership Handle frontend, backend, and database for a seamless process 🔹 Solution-Oriented Solve real business problems with scalable solutions 🔹 Reliable Delivery On-time delivery with production-ready quality 🔹 Clear Communication Timely updates and transparent communication 🔹 Successful Delivery Rate 100%+ delivery with high client satisfaction 🔹 Leadership & Collaboration Lead teams and collaborate for successful outcomes 👉Let’s Connect! Looking for a developer to bring your vision to life? Let’s collaborate and build something amazing. Message me, and I’ll respond quickly.

Senior Java Developer and Backend Architect with 13+ years of hands-on experience designing and building robust, scalable systems across healthcare, logistics, automotive, and marketing domains. I specialize in: Java (SE/EE), Spring Boot, microservices AI: mcp, embeddings, openAI API. AWS: Lambda, S3, CloudFormation, API Gateway Databases: PostgreSQL, Cassandra, Elasticsearch Event-driven architecture: Kafka, SQS CI/CD: Jenkins, GitHub Actions, Docker Frontend (when needed): ReactJS, TypeScript What I bring to your project: * Architecture and implementation of production-ready systems * Fast, reliable backend logic for high-load environments * Clear communication, proactive thinking, and autonomy * Team leadership and mentoring (if needed) * A mix of enterprise-level discipline and startup flexibility Projects I’ve worked on: * A cloud-based ECG diagnostics platform used in real clinical settings (US) * A logistics system with real-time delivery tracking (AWS serverless) * Backend for the IndyCar racing app, streaming telemetry live * A navigation data compiler for BMW infotainment systems * Core services for 'Clutch com', supporting millions of marketing messages daily I’m comfortable joining projects at any stage — from MVP to scaling — and I don’t fear legacy code if the mission is worthwhile. Fluent in written and spoken English. Self-managed, focused on delivery, and easy to work with. Let’s build something solid — I’m open to both short-term work and long-term partnerships.

Greetings All, I'm a Lead Architect with 11+ years of experience in web development. I have developed different kinds of projects, including eCommerce systems, CRM software, corporate websites, APIs and other internal scripts. • A quick learner with a penchant of performing under pressure. strong team player with excellent interpersonal and communication skills, strong analytical and problem solving skills. • Overall 11+ years of experience in development of Mobile, Web & Enterprise applications using PHP5, JAVA and J2EE Technologies. • Artificial Intelligence and Automation - Prompt Engineering, AI Agent Development using n8n - Large Language Model Integration and Conversational AI using Langchain and Botpress - AI Chatbots, Retail AI Voice Bots, and Generative AI • Hands on experience in Core Java, Servlets, JSP, JDBC, Spring, SpringBoot, Hibernate, JPA, JavaFX, JacpFX. • Hands on experience with DevOps, Shell Script, Docker, Docker Compose, Jenkins, AKS, Azure • Hands on experience in NodeJS, Angular, Angular 2-rc3, Ionic Framework. • Hands on experience in ReactJs and Redux Frameworks. • Hands on experience in MySQL, Postgres, Oracle, MongoDB, ArangoDB, SQL Server. • Hands on experience in Apache, Weblogic, Glassfish, JBoss/Wildfly and Tomcat web servers. • Hands on experience in Ejabberd, Openfire and Prosody XMPP Chat servers. • Hands on experience in WebRTC. • Knowledge of Eclipse, Intellij Idea, WebStorm tool for the development of java projects & Node/Angular. • Knowledge of Adobe DW, Aptana studio tool, PHPStorm for the development of PHP projects. • Knowledge of Business Process Management Tool jBPM5.3. Let me know about your goals and I will lead your project to success! ;)

Backend & API Integrations Engineer — Java/Spring Boot, Node.js/NestJS, and the third-party integrations most teams don't want to touch (QuickBooks, Xero, payments, accounting). I build and stabilize reliable backends: clean REST APIs, microservices, and integrations that actually stay in sync. 8+ years of backend experience and 2,700+ hours delivering systems that handle high traffic and financial/inventory workflows. Where I help most: - API & platform integrations — QuickBooks Online & Xero (OAuth2, tokens, webhooks, sync, reconciliation), cXML purchase-order flows, and payment/accounting platforms - Microservices — designed and maintained 32+ services with CI/CD + Docker, improving uptime and cutting deployment time - Backend rebuilds — refactored legacy systems into scalable services with measurably higher throughput - Security — JWT, Spring Security, and Auth0 authentication/authorization - Reliability — async processing with Kafka/SQS, idempotency, retries, and rate limiting, backed by tests (JUnit, Mockito, Testcontainers) Tech I work with: Java, Spring Boot, Node.js, NestJS, Python, PostgreSQL, MySQL, MongoDB, MariaDB, Redis, DynamoDB, Docker, Apache Kafka, AWS SQS, REST, gRPC. How I work: I start with a short review of your current code/architecture, then give you a clear plan, timeline, and checkpoints — so you always know what's happening and what comes next. If you're dealing with a fragile backend, a stalled integration, or you need a new API built right the first time, send me a message describing what you're trying to achieve and I'll reply with a concrete next step. — Samson

Greetings! I am a Java Developer with 4 years of experience in Tech. My skills & abilities allow me to cover all aspects of Back-End development: design and develop a robust Back-End part, and then cover the product with Unit Tests. Due to my profound background in app development for industries like Electric Vehicle Charging, I prefer complex and meaningful projects. Invite me for an interview if you feel like I’m the right person to turn your ideas into reality. TECHNOLOGIES I USE ✅ PROGRAMMING LANGUAGES: Java, SQL ✅ FRAMEWORKS: Spring (Spring Data, Spring Boot, Spring Security), Hibernate ✅ DATABASES: MySQL, JDBC, Hibernate ✅ WEB: Servlets, JPS, Tomcat ✅ TESTING: JUnit ✅ Operating systems: Windows, Linux, Unix ✅ OTHER: Docker, Maven, Git, OCPP 1.6 In addition to the above, I possess a solid grasp of Algorithms and Data Structures. Also, I have extensive Functional Testing and Unit Testing skills. API Integration is also among my strongest sides. MY MOST RECENT PROJECTS ✅FinTech system: The main purpose of the system is to simplify the communication between banks and retail customers who want to get a loan for buying goods. The staff at the retail shops use the system to distribute the buyer’s data across multiple banks. That is done to see which bank will accept the buyer’s loan application at the most optimal conditions. I'm worked on the improvement of the existing codebase; integrated the APIs of multiple banks single-handedly; insured the high quality and full test coverage of the codebase ✅EVCS sharing platform for the Swedish company: A platform consists of 2 parts: the first one is for the owners of the Electric Vehicle Charging Stations, who have installed them and would like to open them for the public in order to gain additional profit; the second one is a mobile app for the drivers who would like to navigate to the available chargers nearby, manage the charging process, and pay for charging. On this project, I performed as a Back-End developer. I'm worked on the improvement of the existing codebase; integrated different payment systems & EV Charging station vendors; was responsible for new feature development LANGUAGES I SPEAK Ukrainian is my native language. Besides, I have strong English skills. Most of my previous customers were English-speaking, so I am comfortable communicating in English. MY TEAM I am at ease as an individual contributor, but being a team player works best for me. So I joined Extrawest — an Upwork Top Rated Agency specializing in FinTech and Banking, Gambling and Betting, Food Ordering and Delivery, Logistics and Fleet Management, Medical Insurance and Healthcare, and special software for Electric Vehicles Charging Station networks since 2006. Having most of our resources based in Europe, we’ve been working with customers from over 20 countries (the US, Canada, Australia, most of the EU, South Africa, Singapore, Japan). Hence, it won’t be a problem for us to adjust to your timezone and working schedule. INVITE ME FOR AN INTERVIEW If you feel I’m a perfect match for your project, let’s set up a call, discuss your ideas and streamline your business’s growth! 🟩 🟩 🟩 🟩 My Agency Skills: Front-End (Frontend) Development, Back-End (Backend) Development, Full-Stack (Fullstack) Development, Mobile Development, EV Charging, Automotive, Logistics, Delivery, Food Ordering, FinTech, Finance, Banking, Dashboard, Healthcare, Insurance, Betting, Gambling, Data Scraping, Flutter, Dart, JavaScript (JS), TypeScript (TS), Angular, Vue.js (VueJS, Vue), React.js (ReactJS, React), Node.js (NodeJS, Node), Java, Spring, SpringBoot, Hibernate, Python, Django, Scrapy, Quality Assurance (QA), Manual Testing, Automated Testing, Selenium, UI/UX Design, User Interface (UI), User Experience (UX), Figma, Adobe Creative Cloud, DevOps, MySQL, PostgreSQL, MongoDB, Firebase, Docker, Amazon Web Services (AWS), Google Cloud Platform (GCP), Project Management (PM).

Senior Java Software Developer with over five years of experience designing, building, and maintaining scalable backend systems and large web applications . Experienced in Java with strong focus on functional and reactive programming, microservices and multi-module architecture, and event-driven systems using Apache Kafka. Strong background in Spring Boot, Spring Security, Spring Data, Hibernate, and secure API development using REST and SOAP with JSON and XML integrations . Currently contributing to the National Platform of Telemedicine (Italy), developing backend systems for large-scale health data digitalization. Working within a microservices architecture using Java 25, MongoDB, and Apache Kafka, integrating HAPI FHIR for healthcare interoperability, and leveraging Apache Ignite for distributed caching. Involved in backend integrations supporting Machine Learning and Natural Language Processing using Spring AI and OpenAI. Additionally responsible for integration with DICOM servers to manage, retrieve, and process medical imaging data, ensuring secure and standards-compliant handling of radiology and diagnostic images within the healthcare ecosystem. Previously led and developed fiscalization and e-invoicing platforms, including web, desktop, and middleware solutions. Implemented multithreading, concurrency control, performance optimizations, PDF generation, analytics reporting, and secure SOAP-based integrations with external tax authorities Holding a Google Cloud Digital Leader certification, demonstrating validated knowledge of cloud fundamentals, GCP services, and cloud-native principles. Actively expanding expertise in Kubernetes, container orchestration, and CI/CD pipelines to strengthen DevOps capabilities and support scalable, production-grade deployments. Strong academic background with Bachelor’s and Master’s degrees in Computer Science, complemented by hands-on experience with relational and NoSQL databases (PostgreSQL, MongoDB, SQL Server, MySQL, Oracle), Git-based workflows, and modern software engineering practices .