Backend and frontend engineer with 16+ years in web development.
Most of my work has been production web systems: marketplaces, CRM products, booking platforms, e-commerce, internal tools, and integrations. Recently I have been using Node.js/NestJS, React, Vue/Nuxt, TypeScript, GraphQL/REST, Python, PHP/Magento, Docker, and GitHub Actions.
I have a long freelance and contract background, including Upwork Top Rated Plus, 100% Job Success Score, and 3000+ billed hours with international clients.
- Portfolio: https://yudin-s.github.io/
- LinkedIn: https://www.linkedin.com/in/sergeyudin
- Upwork: https://www.upwork.com/o/profiles/users/~011535c13b3445c54c/
- Email: serge@keymann.solutions
- Backend services, APIs, integrations, and data-heavy admin workflows.
- React/Vue frontends for dashboards, marketplaces, booking flows, and e-commerce.
- Legacy modernization, especially PHP/Magento/Laravel projects that need to keep running while being improved.
- Architecture reviews, code reviews, delivery planning, and performance work.
- Small automation tools when they solve a real workflow problem.
| Project | Notes |
|---|---|
| PullScope | Static PR review helper for checking changed files and local risk signals. |
| Launchpack | GitHub Pages app for preparing launch copy from rough product notes. |
| Lobster | Local orchestration experiment with Docker execution and markdown work context. |
| Uncle Ben | macOS voice assistant prototype with wake-word control and guarded actions. |
| Garment Decor Nuxt | Nuxt/Vue frontend for a design lab company site. |
| Miro Clone Frontend | TypeScript frontend sample for a collaborative whiteboard app. |
Frontend: React, Vue, Nuxt, TypeScript, JavaScript, HTML, CSS, Sass
Backend: Node.js, NestJS, Express, Python, PHP, Laravel, Magento, Java
APIs: REST, GraphQL, third-party integrations, webhooks
Data: MySQL, PostgreSQL, MongoDB, Redis
Tools: Docker, GitHub Actions, Linux, Nginx, CI/CD
Domains: e-commerce, marketplaces, CRM, booking, dashboards, internal tools, automation
I am open to remote full-time, contract, advisory, hourly, part-time, and project-based work with Europe and US teams.