Олександр

Oleksandr Antonov
Full Stack Engineer

Poltava, Ukraine | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація»)
github.com/OAntonovIT | t.me/OAntonovIT
ABOUT
Full-Stack Engineer with commercial experience building scalable, performant web applications across fintech,
blockchain, healthcare, and e-commerce domains. Specialized in React, TypeScript, and Node.js, delivering
production-ready solutions with clean architecture and reliable performance under load. Experienced in both Agile team
development and full-cycle independent product delivery — from architecture design to release and maintenance. Fast to
ramp up in new domains, results-oriented.

SKILLS
Languages: JavaScript, TypeScript, HTML5, CSS3
Frontend: React, Next.js, Redux Toolkit, RTK Query, React Hooks, MUI, Ant Design, Radix UI, SCSS
Backend: Node.js, NestJS, Express, REST API, WebSocket, PostgreSQL, Prisma, MongoDB
Tools & Practices: Git, GitHub Actions, Docker, Swagger/OpenAPI, Agile/Scrum, Unit Testing, Performance
Optimization, Responsive Design
AI Tools: Claude Code (AI-assisted development), AI pair programming

EXPERIENCE
Frontend Engineer, DashDevs Jul 2025 – Present
• Developed feature-rich UIs for a fintech CRM platform (Middle East client), building data-heavy pages with complex
tables, dynamic forms, and advanced filtering using React and Ant Design.
• Implemented frontend role-based access control by parsing JWT access tokens and conditionally guarding routes
and UI elements via React Router based on user permissions.
• Built reusable custom React hooks and Axios-based data-fetching layers, improving code consistency and
maintainability across the application.
• Contributed to the admin panel of a crypto wallet product, developing UI components with React, Radix UI, and
RTK Query for efficient server-state management.
• Delivered all assigned features on schedule with zero post-release defects, presenting work in bi-weekly client-facing
demos as part of a 10+ engineer cross-functional team.
Stack: React, Redux Toolkit, TypeScript, RTK Query, Radix UI, Ant Design, Axios
Domain: Fintech, Blockchain

Full-Stack Engineer, Self-Employed Jan 2025 – Jun 2025
ortodont-clinic-frontend.vercel.app
• Independently designed, built, and deployed a full-stack CRM for a dental clinic, now in active production use —
serving 20 users across 6 dental chairs, managing 2,900+ patient records and a 270+ service catalog — with a
React/TypeScript SPA frontend and NestJS/PostgreSQL backend.
• Architected a modular NestJS backend with feature modules, global DTO validation, centralized exception
handling, and Swagger/OpenAPI docs, plus a reusable query layer (filtering, sorting, field-limiting, pagination)
across 40+ REST endpoints in 5 resource modules.
• Built a scheduling conflict-detection system that validates time-slot overlaps per dental chair, preventing
double-booking by comparing appointment intervals in minutes.
• Implemented JWT authentication with Nest guards and role-based access control (admin/doctor), HttpOnly secure
cookies, bcrypt password hashing, and a hardened security layer (helmet, rate-limiting, CORS whitelist, request
validation).
• Developed an interactive FDI dental-chart component (4×13 grid) with mutation-protected cells and multi-record
history, plus reusable custom hooks (useCreateEntity, useUpdateEntity, useSearch) unifying CRUD, pagination, and
URL-synced state across all entities.
• Implemented end-to-end real-time appointment updates with Socket.io (backend events synced live to the client),
containerized the app with Docker, and deployed to production via Vercel.

Stack: React, TypeScript, Redux Toolkit, MUI, SCSS, Axios, NestJS, PostgreSQL, Prisma, Socket.io, JWT, Docker,
Swagger
Domain: Healthcare, CRM

Frontend Engineer, RGB Studio Sept 2024 – Dec 2024
• Developed UI components and pages for an e-commerce platform selling educational materials to teachers,
contributing to catalog, product, and user-account sections.
• Built server-side rendered (SSR) pages with Next.js, leveraging its rendering features to improve initial load
performance and SEO for catalog content.
• Implemented reusable, responsive UI components with Redux Toolkit and MUI, ensuring consistency and
maintainability across the application.
• Collaborated with the team to deliver features on schedule, aligned with business requirements and design
specifications.
Stack: Next.js, React, Redux Toolkit, MUI, REST API
Domain: E-commerce, EdTech

LANGUAGES
English: B2 (Upper-Intermediate) Ukrainian: Native