Sergio – Solana, Smart contracts, Rust

Respondo is a factual question-answering chatbot that provides answers based exclusively on information stored in its internal vector database. The product is designed to use only explicitly provided data, without accessing the Internet, guessing, or generating unsupported information. The candidate designed, programmed, and deployed the solution to Oracle Cloud.

• Designed Respondo to accept data from text files and websites and answer questions based on that data;
• Stored data in a local ChromaDB vector database to avoid relying on third-party providers where possible;
• Used Gemini to interpret user questions, query the vector database for answers, and translate between languages;
• Developed the chat and admin web interfaces in React;
• Used AI-assisted development with Google's Antigravity by providing the design, reviewing generated code, requesting changes and validations, and manually updating features and adjustments as needed.

A payment processing system for sending and handling payment requests using Solana and Bitcoin. The product enables users to initiate and process cryptocurrency payments through these blockchain networks.

• Developed a web application that allowed admins to create and send payment requests via QR codes for Solana and Bitcoin;
• Implemented payment request options such as time-to-live and default payment amounts;
• Added retry functionality to support payment requests that were not completed successfully on the initial attempt;
• Supported the administration and processing of cryptocurrency payment requests through the web interface.

A proof-of-concept solution on the Solana blockchain for managing staked funds on behalf of end users. The product was intended to support the management of users’ staked assets through blockchain-based functionality.

• Developed a proof-of-concept on Solana that allowed the platform admin to assign SOL to various staking providers for resale to platform users;
• Implemented functionality for managing SOL allocations across different staking providers;
• Calculated staking payouts to support accurate returns for platform users;
• Provided comparisons between staking returns within the platform and staking outside the system.

A Solana-based platform designed as an on-demand marketplace connecting users with services through blockchain-based functionality. The candidate contributed to the on-chain side of the product, supporting its blockchain operations and functionality.

• Enabled on-chain transactions on Solana to process payments between drivers and riders;
• Implemented on-chain transactions to process payouts between drivers and riders;
• Implemented a rewards system for platform users;
• Supported the blockchain functionality required for payments and payouts within the platform.