Adrian Cata

Delivered a multi-tenant SaaS platform using React, Next.js, Node.js, PostgreSQL, and AWS for 5,000+ active users, maintaining responsive customer experiences during peak transactional load. Improved frontend architecture with reusable React components, SSR strategies, and shared UI patterns to reduce duplicated implementation effort and improve release consistency. Architected backend services with NestJS and event-driven communication, separating onboarding, billing, and customer operations into independently deployable capabilities to reduce release coupling. Implemented fintech workflows integrating Stripe payments and APIs including subscription billing, invoice generation, reconciliation, payment lifecycle management, and recurring revenue operations. Optimized asynchronous processing, queue orchestration, and caching strategies using RabbitMQ and Redis to resolve backlog scenarios during peak traffic. Designed PostgreSQL data models, indexing, and reporting queries for analytic

Developed enterprise AI products and automation systems for financial services, healthcare, and SaaS organizations using Python, FastAPI, React, PostgreSQL, and Azure. Built production-grade RAG systems by creating ingestion, transformation, embedding, retrieval, and indexing pipelines over enterprise datasets to improve retrieval quality and reduce irrelevant context returned in production workflows. Built AI-assisted document review and enterprise knowledge retrieval systems to reduce dependency on manual document analysis and accelerate access to business information. Developed document intelligence pipelines combining OCR, contextual retrieval, and LLM processing to speed document analysis and improve structured information extraction. Designed and implemented agent orchestration workflows enabling tool-enabled AI agents with controlled execution paths and multi-step business automation. Implemented evaluation and validation mechanisms for prompts, retrieval outputs, and response

Developed customer-facing B2B SaaS and subscription-based e-commerce platforms using React, Next.js, Node.js, TypeScript, and PostgreSQL. Led implementation of customer onboarding, account management, subscription, checkout, and order workflows—owning delivery from technical design through production rollout and stabilization. Built frontend and backend capabilities supporting transactions, inventory synchronization, and real-time order consistency. Designed and integrated payment infrastructure using Stripe, PayPal, and Adyen to enable recurring billing and secure international purchasing experiences. Delivered integrations across CRM, ERP, logistics, and marketplace ecosystems supporting end-to-end business operations. Improved responsiveness via frontend optimization, caching strategies, database tuning, and API improvements, reducing average page-load time by 17%. Implemented OAuth 2.0, JWT, and RBAC authentication frameworks across customer-facing applications. Contributed to