Oleksii — Backend Development freelancer in Kyiv

Hi! I'm Oleksii, a seasoned Full-Stack Developer specializing in scalable web applications, mobile solutions, and API integrations. With 10+ years of experience and a proven track record on Upwork (Top Rated Plus, 100% success score), I help businesses transform ideas into powerful digital solutions. TECHNICAL EXPERTISE: Backend: Python (Django, FastAPI, Flask), PostgreSQL, Redis, Celery Frontend: Vue.js, JavaScript, HTML5, CSS3, Bootstrap Mobile: Cross-platform development (Cordova), iOS\u002FAndroid deployment Cloud & DevOps: AWS (EC2, S3), Linux, API integrations Specialized: AI\u002FChatbots, IoT integration, E-commerce, Booking systems WHAT I DELIVER: - Complete web applications from concept to production - Cross-platform mobile apps (iOS\u002FAndroid from single codebase) - API development and third-party integrations - E-commerce and booking platforms - AI chatbot solutions and automation - Database optimization and system architecture PROVEN RESULTS: • 50+ successful projects completed • 3000+ hours worked for long-term clients • 100% job success score on Upwork • Apps successfully deployed to App Store\u002FGoogle Play • Platforms serving thousands of active users RECENT PROJECT HIGHLIGHTS: • AI-powered chatbot platform with multi-engine integration • Cross-platform IoT application with hardware communication • Digital library system with OCR and full-text search • Multi-city booking aggregator with commission tracking • E-commerce platform for children's activities WHY CHOOSE ME: ✓ Fast turnaround without compromising quality ✓ Clean, maintainable, and well-documented code ✓ Excellent communication and regular updates ✓ Full project lifecycle management ✓ Post-launch support and maintenance Ready to bring your vision to life? Let's discuss how I can help you achieve your goals with a solution that's built to scale and perform. Available for both short-term projects and long-term partnerships.