Oleksandr B.

Full Stack Developer React Next.js Nest.js Node.js TypeScript AWS

Full Stack Developer with 4+ years of commercial experience building scalable SaaS platforms, CRM systems, AI-powered applications, marketplaces, booking platforms, internal tools, and custom business software. Over the years, I've contributed to 20+ successful projects, helping startups and growing businesses launch products faster, automate workflows, and improve operational efficiency. As a Full Stack Developer, I specialize in delivering complete end-to-end solutions - from responsive frontend development and modern UI implementation to backend architecture, API development, database design, cloud infrastructure, and AI integrations. 💻 Technologies Frontend Development React Next.js (13/14/15) TypeScript JavaScript Redux Toolkit Zustand Tailwind CSS SCSS Framer Motion Three.js React Spring Material UI Ant Design shadcn/ui. Experienced Full Stack Developer with strong expertise in building SEO-friendly applications using SSR, SSG, ISR, and CSR. I focus on performance optimization, responsive design, accessibility standards, and pixel-perfect UI implementation. Backend Development Node.js NestJS Express.js REST APIs GraphQL WebSockets Microservices Event-Driven Architecture Authentication & Authorization (JWT, OAuth 2.0, SSO), background jobs, queue systems, automation pipelines, and AI-powered services. As a Full Stack Developer, I have built backend systems, integrated complex third-party services, payment providers, notification systems, and real-time communication features. I also work with AI integrations including OpenAI, Claude, ChatGPT, vector databases, and custom automation workflows. Databases PostgreSQL MySQL MongoDB DynamoDB Redis Supabase Firebase Prisma TypeORM MikroORM Knex. I have experience designing scalable database architectures, optimizing complex queries, implementing caching layers, indexing strategies, and ensuring data consistency across production environments. Cloud & DevOps AWS (EC2 Lambda S3 CloudFront RDS API Gateway Cognito) Google Cloud Platform Docker Docker Compose Nginx PM2 CI/CD GitHub Actions GitLab CI/CD monitoring VPS setup SSL configuration reverse proxies and production deployments. As a Full Stack Developer, I regularly deploy and maintain cloud-native applications, serverless architectures, and scalable backend services designed to support growth from MVP stage to production environments. ⚙Key Expertise • 4+ years of Full Stack Development experience • 20+ successfully delivered project • 50+ integrations with external APIs and third-party services • 10+ SaaS, CRM, and internal business platforms • 15+ payment, billing, and subscription-based implementations • 10+ AI-powered features and automation workflows delivered • 30–50% performance improvements on multiple production applications • 10+ cloud-hosted applications deployed and maintained • Real-time systems with WebSockets, notifications, and live updates • Secure authentication, authorization, and user management systems 🏭 Industries • FinTech & Financial Services • Healthcare & Medical Platforms • E-commerce & Marketplaces • Logistics & Transportation • Real Estate & PropTech • Education & EdTech • AI Products & Automation Platforms • CRM & B2B SaaS Solutions • Booking & Reservation Systems • Security & Monitoring Platforms As a Full Stack Developer, I can help with new product development, existing codebase maintenance, feature expansion, performance optimization, third-party integrations, technical architecture, and long-term product growth. Whether you need an MVP built from scratch, a complex SaaS platform, AI-powered functionality, cloud infrastructure, payment integrations, or long-term product development, I can help take your project from concept to production. Available for both short-term projects and long-term collaborations. Let's build a scalable, production-ready solution that delivers measurable business value.