Bohdan R.

Need an AI-powered SaaS product, internal automation tool, RAG assistant, marketplace, payment platform, or scalable web application built with clean architecture and production-ready code? I’m Bohdan Rybchynskyi, a senior full-stack developer and backend-focused SaaS developer with 8+ years of experience building web platforms, APIs, automation systems, AI workflows, eCommerce solutions, and high-load backend infrastructure. I help founders, product teams, and growing companies turn complex business workflows into reliable software: from MVP architecture and backend development to integrations, dashboards, AI features, and long-term scaling. 🏆 What I can help you build • AI-powered SaaS products and internal tools • RAG assistants, LLM workflows, and AI-enabled backend features • Laravel, Python/FastAPI, Node.js, React, Vue/Nuxt web applications • API-first platforms, dashboards, admin panels, and multi-role systems • Payment integrations, webhooks, reconciliation, and transaction workflows • eCommerce and marketplace platforms with orders, checkout, vendors, and payouts • Automation systems, background jobs, queues, and third-party integrations • Backend architecture, refactoring, performance optimization, and scaling ⚙️ Why clients work with me I don’t just implement isolated tickets. I help define the technical structure behind the product, identify risks early, and build systems that can survive real usage. My work usually involves: • clean backend architecture • reliable API design • scalable database structure • authentication, authorization, and permissions • background jobs and async workflows • integrations with external services • observability, error handling, and production stability • frontend integration with React, Vue, Nuxt, or Next.js • AI features that are practical, cost-aware, and maintainable 📌 Relevant project experience 🔶 AI / RAG / LLM Systems Built AI-powered workflows using LLMs, RAG, vector search, schema indexing, business rules retrieval, and natural-language interfaces for analytics, document processing, and internal automation. 🔶 SaaS Platforms & Internal Tools Developed SaaS platforms with multi-role dashboards, subscriptions, admin panels, reporting, permissions, and complex business workflows. 🔶 Payment & Fintech Backends Worked on payment orchestration systems, provider integrations, webhooks, retries, reconciliation, FX-rate services, event-driven processing, queues, and monitoring. 🔶 eCommerce & Marketplace Systems Built and maintained eCommerce and marketplace platforms with catalog management, checkout, orders, shipping integrations, vendor workflows, payouts, and custom business logic. 🔧 Tech stack Backend: Laravel, PHP, Python, FastAPI, Django, Node.js, NestJS, Go Frontend: React, Next.js, Vue.js, Nuxt.js, TypeScript Databases: PostgreSQL, MySQL, Redis, OpenSearch, Elasticsearch AI: OpenAI API, Gemini, LangChain, LangGraph, RAG, vector databases Infrastructure: Docker, AWS, CI/CD, queues, microservices, event-driven systems Integrations: REST APIs, GraphQL, payment gateways, webhooks, SaaS APIs 🚀 Best fit projects • AI SaaS MVPs • RAG assistant development • Laravel / React SaaS platforms • Python FastAPI backends • API integrations and automation • payment and fintech workflows • marketplace and eCommerce platforms • complex backend architecture and refactoring If you need a developer who can own the technical side of a SaaS product, not just close tickets, I can help.