Vladislav B.

I’m a Senior Full Stack Engineer with 7 years of commercial experience and Upwork Top Rated Plus status with a 100% Job Success Score. I help companies build, scale, and modernize production SaaS products - from backend architecture and complex business logic to polished React/Next.js interfaces, integrations, and cloud deployment. Core expertise: • Frontend: React, Next.js, TypeScript • Backend: Node.js, NestJS, REST, GraphQL, WebSockets • Data: PostgreSQL, MongoDB, Redis • Architecture: System Design, Microservices, Event-Driven & Distributed Systems • Cloud & DevOps: AWS, Docker, Terraform, CI/CD, Observability • AI Engineering: LLM Integration, RAG, Tool Calling, Structured Outputs, Vector Search, MCP Selected experience: • Built and scaled a logistics CRM/ERP used by 500+ active customers • Improved application and database performance by up to 60-70% • Built ETL and data-processing systems integrating multiple external sources • Designed asynchronous, event-driven, and real-time workflows • Built APIs, authentication, payment flows, and third-party integrations • Delivered products end to end from architecture and implementation to deployment, monitoring, and production support I integrate AI into production products using LLM APIs, RAG, tool calling, structured outputs, embeddings, vector search, and MCP. My recent work includes AI operations workflows and retrieval systems with validation, observability, and deterministic business logic around the model. I’m especially useful on products with complex business logic, performance bottlenecks, data-heavy workflows, legacy modernization, or demanding third-party integrations. I can take ownership from problem definition and architecture through implementation, deployment, and production support, whether I’m joining a greenfield product or an established codebase.