Vitali K.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 Sep 24, 2026.

I am a Software Developer with 8 years of experience in Tech overall, 5 of them as a Full-Stack Developer focused on MERN stack (React.js, Node.js, MongoDB, Express.js). I am well prepared to work with Machine Learning (ML) and Artificial Intelligence (AI) in FinTech, Insurance, MarTech, Banking, Investment, and other industries. So I am looking for an opportunity to apply my knowledge to deliver exciting new projects in this area! As for AI & ML, I work as a Fullstack Developer using Node.js, TypeScript, and JavaScript. I am well-versed in working with LlamaIndex, Langgraph, Langchain, RAG, Embeddings, LLM, FineTuning, NPL, vector database, graph database, Knowledge Graph, OpenAI, Gemini, Groq (LLama2, LLama3, Gemma, LLava), Ollama, etc. If you need an elegant AI/ML solution, invite me for an interview! 🟩 🟩 🟩 🟩 My superpowers are my problem-solving attitude, clean code, and technical proficiency. Along with creativity and a keen eye for detail, it helps me to solve an issue of almost any complexity. In addition, my strong suit is fast self-learning and being great at teamwork. It helps me master new technologies easily, work with the team efficiently, and choose the best tech stack for every case. TECH STACK ✅ AI/ML STACK: LlamaIndex, Langgraph, Langchain, RAG, Embeddings, LLM, FineTuning, NPL, vector database, graph database, Knowledge Graph, OpenAI, Gemini, Groq (LLama2, LLama3, Gemma, LLava), Ollama ✅ PROGRAMMING LANGUAGES: JavaScript (ES5, ES6), Typescript, PHP, HTML5/CSS3 ✅ FRAMEWORKS/LIBRARIES: React.js, Node.js, Nest.js, Express.js, Redux, React Router, Redux-thunk, Graphql, Material UI, Chakra UI, Bootstrap 4 ✅ TESTING TOOLS: Enzyme, Jest ✅ DATABASES: MySQL, MongoDB ✅ PREPROCESSORS: Sass, SCSS ✅ OTHER: REST API, AWS Amplify, AWS Cognito, Retool, Figma PORTFOLIO ✅ Australian eCommerce platform for selling online agriculture courses. This e-shop app was developed for an Australian company to sell professional online courses. The system is based on Cezerin — an open-source eCommerce platform. Tech stack: React.js, Redux, Node.js, Express.js, MongoDB, Cezerin, Material UI, REST API. ✅ MarTech MVP is an aggregator of Marketing Technology tools, presented in the form of a web map, accessible to MarTech professionals and their customers. Tech stack: React.js, Redux, React Router, Material UI, AWS Amplify, AWS Cognito. 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 software for Electric Vehicles Charging Station networks 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 feel I’m a perfect match for your project, invite me, and let’s streamline your business’s growth! 🟩 🟩 🟩 🟩 My Agency Skills: Front-End (Frontend) Development, Back-End (Backend) Development, Full-Stack (Fullstack) Development, Mobile Development, Artificial Intelligence (AI), Machine Learning (ML), EV Charging, Automotive, Logistics, Delivery, Food Ordering, FinTech, 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), Manual Testing, Automated Testing, UI/UX Design, Figma, Adobe Creative Cloud, DevOps, MySQL, PostgreSQL, MongoDB, Firebase, Docker, Amazon Web Services (AWS), Google Cloud Platform (GCP), Project Management (PM).