Eugene R.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I am a Senior Java Developer with 10+ years of experience in architecting and developing robust, high-load, and data-intensive backend systems. As an AWS Certified Solution Architect, I specialize in cloud-based solutions that ensure security, scalability, and peak performance. I also have a strong knowledge of software development lifecycle, testing practices, and approaches, especially in FinTech, EV Charging, Gambling, and AI/ML niches. 💡 What I Offer: ✔️ Expert in Java & Cloud-Based Development – I design and build high-performance backend solutions for web and mobile applications. ✔️ FinTech, EV Charging & AI/ML Specialist – I develop solutions tailored to banking, investment, digital wallets, insurance, and other high-tech industries. ✔️ High-Load & Scalable Architectures – Skilled in optimizing multi-component systems for speed, efficiency, and reliability. ✔️ Seamless Team Collaboration – Experienced in working with startups and enterprises across Europe, Asia, and South Africa 🔍 Industries I Excel In: 📈 FinTech & Banking – Digital wallets, dashboards, financial management tools, and investment platforms. ⚡ EV Charging & Energy – Backend solutions for OCPP, OCPI, OICP-integrated charging networks. 🎲 Gambling & AI/ML – AI-driven platforms and real-time data processing. 🟩 🟩 🟩 🟩 Tech Stack & Expertise 💻 Languages: Java, JavaScript 📚 Frameworks: Spring (MVC, Boot, IoC, Data, Kafka), Akka, Hibernate, ReactiveMongo, GraphQL, Vue.js ☁ Cloud & DevOps: AWS (SQS, SNS, Param Store), Docker, Jenkins 🛢 Databases: MySQL, MongoDB, PostgreSQL, MariaDB, SQL 🧪 Testing: Mockito, JUnit, ScalaTest 📡 Other: IntelliJ IDEA, SBT, Nats, Kafka (Mirror, Connectors, Clusters), Maven, Linux, REST, Scrum, Docker, HTML, CSS, Nuxt, Jenkins, OOP, OCPP, OICP, OCPI PORTFOLIO ✅ Banking application for one of the biggest banking groups in Africa. Environment: Java 8, Spring Boot, Maven, PostgreSQL, AWS (SQS, SNS, Param Store) ✅ Food delivery platform with multiple user roles for a Japanese customer. Environment: Java 8, Spring Boot, Maven, MongoDB, Kafka, PostgreSQL, AWS, Gitlab, Hibernate, SQL, Mongo, CircleCI ✅ Data aggregation system for Casino Gambling apps. Environment: Java 8, Spring Boot, Maven, MongoDB, Kafka ✅ EVCS management system with a back-office platform for a Belgian start-up. Environment: Java 11, Spring Boot, Maven, MongoDB, Kafka, MariaDB, AWS, Gitlab, Hibernate, SQL, OCPP, OCPI, OICP ✅ US EVCS management system with a back-office platform. Environment: Java 17, Java Reactive Programming, Spring Boot, Maven, MongoDB, Kafka, MySQL, AWS, Gitlab, Hibernate, SQL, OCPP ✅ EVCS management system for an underground parking company. Environment: Java 8, Spring Boot, Maven, MongoDB, Kafka, MySQL, AWS, Gitlab, Hibernate, SQL ✅ EVCS management and a back-office platform with a mobile app developed for clients’ access. Environment: Java 8, Spring Boot, Maven, MongoDB, Kafka, MySQL, AWS, Gitlab, Hibernate, SQL ✅ A mailing system for a Moroccan software company. Environment: Scala, Akka (Actor, Remote, Http, Stream), Spray, Mongo, ReactiveMongo, Mockito, ScalaTest, Colossus Framework (HTTP server), scalaJ, etc. I was a Lead Developer and Architect of these projects, working with the AWS services & Microservice architectures, and assisting the DevOps team. 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 EV Charging since 2006. Most of our resources are based in Europe, so we’ve been working with customers from over 20 countries (the US, Canada, Australia, most of the EU, South Africa, Singapore, and 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 are moving towards great goals and unique ideas, invite me for an interview, and let’s streamline your business’s growth together! 🟩 🟩 🟩 🟩 My Agency Skills: Front-End (Frontend) Development, Back-End (Backend) Development, Full-Stack (Fullstack) Development, Mobile Development, AI/ML, EV Charging, Automotive, Logistics, Delivery, Food Ordering, FinTech, Banking, Loan, Mortgage, Dashboard, Healthcare, Insurance, Betting, Gambling, 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), UI/UX Design, Figma, Adobe Creative Cloud, DevOps, Amazon Web Services (AWS), Google Cloud Platform (GCP), Project Management (PM).