Nikolai S.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.

Senior Software Engineer | JavaScript| TypeScript| React | Express With over 6 years of hands-on experience in front-end and full-stack development, I specialize in creating dynamic, user-focused applications for industries like finance, security, and automation. My approach blends deep technical expertise in JavaScript and TypeScript frameworks (React, Ext JS, Angular) with a focus on enhancing application performance, user experience, and functionality. Tech Stack: Frontend: React, Angular, Sencha Ext JS, Vue, Redux, MobX, Formik, Styled Components, Material UI, Bootstrap, Tailwind, jQuery Backend: Node.js, Express, Electron, Centrifuge, Node-OPCUA, JWT, OAuth, PostgreSQL, MongoDB, SQLite, AWS DevOps & Cloud: Docker, AWS (S3, EC2, Amazon RDS), Continuous Integration/Continuous Deployment (CI/CD)