Mihail Griniuc

React, React Native, Next.js, Node.js, PostgreSQL, AWS, REST APIs, LLM APIs

• Built and deployed a full-stack peer-to-peer marketplace serving 450+ users and processing 1000+ listings across the U.S.
• Developed the platform end-to-end across frontend, backend, and APIs, and shipped a cross-platform mobile app for iOS and Android.
• Designed core marketplace systems including listings, search, user accounts, messaging, and transactions, along with trust and safety features such as escrow payments, account verification, and anti-fraud protections.
• Reduced user drop-off by 80% and improved page load performance by 70% through UX optimization and targeted performance tuning.
• Iterated rapidly on new features based on user feedback, improving engagement and overall marketplace activity.

Node.js, PostgreSQL, Supabase, REST APIs, LLM APIs

• Built an AI-powered B2B invoicing system that automated invoice generation from client activity, reducing billing cycle time by 75% and minimizing manual errors.
• Automated invoice validation, approval workflows, and PDF generation, reducing manual processing time and eliminating billing bottlenecks.
• Integrated Node.js and PostgreSQL-based services with internal accounting systems via REST APIs, enabling real-time financial reporting and seamless data flow.
• Integrated LLM-based text understanding to interpret unstructured client inputs and convert them into structured invoice line items.

Node.js, PostgreSQL, AWS

• Built and maintained internal tools that streamlined operations, reducing support workload and improving system reliability.
• Improved order fulfillment accuracy by 35% by designing automated database sync jobs and validation scripts in Node.js.
• Led a small engineering team, reviewed code changes, and improved delivery velocity through better task breakdown and documentation.
• Boosted customer retention by 20% by analyzing behavioral data and implementing targeted improvements.