Claudiu Ionescu

Contributing to the development of a high-speed automated repricing engine for e-commerce marketplaces, focusing on feature expansion and platform stability within a serverless architecture.

• Engineered a full-stack Chrome Extension using React and Mantine to provide real-time WFS/FBA fee calculations, profit analysis, and competitor insights for Amazon and Walmart sellers.
• Developing full-stack features using React and the Remix framework with the Mantine UI library.
• Contributing to backend logic and API development powered by AWS Lambda and PostgreSQL.
• Utilizing SST (Serverless Stack) for streamlined deployment and infrastructure management on AWS.
• Collaborating on bug fixes and performance optimizations for the core repricing engine.

As the founding developer, I built the initial MVP from scratch and scaled the platform into a comprehensive inventory and order management system for Amazon and Walmart Marketplace sellers. Later contributed to the architectural migration to a modern serverless stack.

• Architected and developed the v1 platform using Node.js, Express, and MySQL, deployed on AWS EC2 and RDS.
• Engineered a high-volume web crawling system using Redis to monitor real-time price and availability across diverse supplier websites.
• Designed core inventory and order management logic specifically tailored for high-volume dropshipping workflows.
• Collaborated on the v2 platform transition to a modern stack including TypeScript, React, and AWS Lambda.
• Implemented scalable infrastructure using AWS CDK and SQS to handle increased throughput and multi-marketplace support (Walmart/Amazon).
• Maintained and adapted specialized web scraping services written in Python and Go

Co-founded a non-profit fintech platform designed to centralize charitable giving and provide consolidated tax reporting. Led the technical strategy and product validation during the venture's participation in a premier university accelerator.

• Took part in the FAU Tech Runway accelerator program at Florida Atlantic University, focusing on lean startup methodology and market validation.
• Defined the technical roadmap for the giving marketplace, including user community features and tax-receipt consolidation logic.
• Managed an offshore development team in India, overseeing architectural decisions and ensuring high-quality delivery of product requirements.
• Facilitated strategic meetings between stakeholders and technical teams to align business goals with software implementation.

Developed the backend tournament engine for the online multiplayer game Rummy Passion, handling the end-to-end lifecycle of competitive gaming events.

• Architected and implemented a tournament engine to manage scheduling, player registration, and automated game execution.
• Integrated real-time communication between the frontend and game engine using Socket.io.
• Developed prize distribution logic to automatically award winners at the conclusion of tournaments.
• Utilized a technology stack consisting of Node.js, MySQL, and Redis for high-performance tournament data management.

Collaborated as a freelance developer on multiple specialized backend and data-driven projects, focusing on web scraping and search engine optimization.

• Developed a web crawler and scraper using Node.js and PhantomJS to extract and store data from public websites in a MongoDB database.
• Built a frontend dashboard utilizing the DataTables plugin to visualize and manage crawled website information.
• Engineered a remote search API allowing for JSON data imports and high-performance indexing via Elasticsearch.
• Implemented search and autosuggestion features for imported data using a stack of Node.js, MongoDB, and Elasticsearch.

Focused on frontend development and real-time backend systems, specializing in JavaScript technologies and social platform customization.

• Developed JavaScript frontend applications using jQuery and Bootstrap, including a web-based customer support chat application.
• Designed and implemented a real-time analytics system using Node.js for backend operations and Redis for high-performance data access and caching.
• Customized websites based on the Elgg social networking platform.
• Created a PHP-based Elgg module for social authentication via OAuth protocol integration (Facebook, Google, Twitter).

Developed an application used for train scheduling to communicate train scheduling proposals between departments of railway circulation and keeping a database of such proposals. Provided technical support for deployed railway applications by answering tickets, analyzing issues, and troubleshooting applications.

• Developed a train scheduling communication application using C# and Microsoft SQL Server.
• Managed a database of scheduling proposals to facilitate inter-departmental communication.
• Resolved technical issues and provided troubleshooting for railway software via a ticketing system.