Вадим

VADIM CHAIKIN
Frontend Engineer | Full-stack Sofia, Bulgaria | LinkedIn/vadim-chaikin | [відкрити контакти](див. вище в блоці «контактна інформація»)
PROFESSIONAL SUMMARY
Result-driven Frontend Engineer with a focus on building high-performance, scalable web applications. Expert in the React 19 + TypeScript ecosystem and FastAPI-based backend architectures. Proven track record in full-stack development, from architecting relational databases (PostgreSQL) to building pixel-perfect, accessible UI components. Passionate about clean code, type safety, and modern infrastructure (Docker, S3). Seeking to leverage strong problem-solving skills to contribute to high-impact engineering teams.
CORE COMPETENCIES
• Frontend: React 19, TypeScript, Vite, React Router, Redux Toolkit, Material-UI (MUI), i18next.
• Backend & API: FastAPI, RESTful API design, PostgreSQL, SQLAlchemy (ORM), Auth patterns (PyJWT, OTP).
• Infrastructure & Storage: Docker, MinIO (S3-compatible storage), Cloudinary, Telegram Bot API integration.
• Methodologies & Tools: Git, CI/CD basic concepts, ESLint/Prettier, Agile/Scrum, SOLID Principles.
KEY PROJECTS
Swoyachovskiy | Full-Stack E-commerce Platform
• Tech Stack: React 19, TypeScript, FastAPI, PostgreSQL, SQLAlchemy, MinIO, Docker, Monobank API, Checkbox API.
• Problem-Solving: Replaced third-party rigid platforms with a custom, scalable engine that handles the full order lifecycle: from cart validation and payment processing to automated logistics and fiscal receipt generation.
• User Experience (UX): Created a friction-less customer journey with passwordless email login, interactive multi-step checkout (integrated with Nova Poshta address database), and a real-time order history tracking dashboard.
• Technical Resilience: Implemented a secure backend environment utilizing environment-based secrets management, Nginx reverse proxying, and containerized deployment (Docker) to ensure 99.9% uptime.
• Business Automation: Streamlined store operations through a unified admin dashboard, enabling automated synchronization between customer payments (Monobank webhooks), fiscal data (Checkbox), and shipping status (Nova Poshta).
WORK EXPERIENCE
Full-Stack Developer (Independent) | 2024 – Present
• Architected and deployed a custom e-commerce ecosystem (Swoyachovskiy), migrating from a monolithic approach to a high-performance, event-driven architecture using FastAPI and PostgreSQL.
• Engineered end-to-end checkout & logistics workflows: Integrated Monobank API for seamless payments, Nova Poshta API for automated shipping/tracking, and Checkbox API for automated fiscal reporting (PRRO).
• Implemented a robust notification & auth system: Designed a passwordless authentication flow via email OTPs; established an multi-channel notification engine (email via Resend, real-time alerts via Telegram Bot API).
• Optimized storage and delivery: Built a custom media-handling service using MinIO (S3) to eliminate reliance on external providers; implemented optimized image delivery pipelines.
• Operational Excellence: Automated administrative workflows by building a custom CRM-like admin panel, reducing order processing time by automating status updates via bank webhooks.
EDUCATION
Bachelor of Software Engineering | SSS "KhCTPC NTU 'KhPI'", Kharkiv | 2022 – 2026
LANGUAGES
• English: C1 Advanced (EF SET)
• Ukrainian: Native
• Russian: Native