Backend & Blockchain Engineer (Founding Team)

RebelFi

Jun 2024 - Jan 2026 | United States

• Core engineer in the founding team responsible for designing and building the financial infrastructure powering multiple Web3 financial products: RebelFi POS, Zerocut, and Midas.
• RebelFi POS: Contributed to the design and implementation of the backend and blockchain execution layer for a non-custodial crypto point-of-sale system that allows merchants to accept Solana-based payments with instant settlement and zero processing fees. Designed secure transaction flows, accounting logic, and vault interactions to ensure funds always remained under merchant control.
• Zerocut: Designed and implemented the core on-chain accounting and treasury infrastructure for a crypto-native banking platform. Built double-entry bookkeeping models, vault architectures, and multi-step execution flows for transfers, payouts, and treasury operations, ensuring financial consistency and safety at scale. Won the Global PYUSD Portal Hackathon (PayPal) in the "Cha-ching!" DeFi/Trading category.
• Midas: Designed a programmable financial infrastructure layer enabling institutions to access DeFi yield strategies without giving up custody or building smart contracts. Built yield orchestration systems, custody-safe execution models, and protocol integration layers abstracting Fireblocks, BitGo, and self-hosted custody setups.
• Architected ring-fenced vault systems separating custody, execution, and accounting layers to eliminate the possibility of automation systems directly controlling funds.
• Designed multi-phase financial state machines (Authorize → Initiate → Execute / Cancel) for withdrawals, transfers, and DeFi interactions to safely handle asynchronous blockchain execution.
• Implemented role-based access control using Solana PDAs to enforce least-privilege security across admin, automation, and application keys.
• Integrated multiple DeFi protocols using CPI calls with PDA signing, enabling automated yield generation while maintaining strict custody guarantees.
• Built reconciliation tools and admin recovery flows to resolve on-chain state drift without breaking accounting invariants or financial integrity.

Full Stack Developer

Stoical

Apr 2024 - Present | Madrid, Spain

• Developed dashboard for companies with tools to manage job offers, candidates, evaluate candidates' skills through AI-powered chat sessions using OpenAI API, interactive graphs, and more.
• Designed a candidates' page where users can view their competencies in graph form, see assigned job offers, and access links to their test sessions.
• Developed user authentication in Node.js using JWT for token creation and MongoDB for data storage.
• Implemented a new theme with Material UI's extendTheme, incorporating responsive design elements like font sizes, colors, and typography.

Full Stack Developer

Silver Brain AI AG

Oct 2023 - Mar 2024 | Zug, Switzerland

• Led a front end team in two successful project implementations.
• Developed the onboarding process for new users, enhancing user experience.
• Implemented new features, including a payment form with auto-fill inputs using Google Places, and navigation components like navigation rail and navigation drawer.
• Developed a vector search functionality for .pdf, .doc, and .pptx files.
• Learned and integrated new technologies to me such as Django, Redis, and Jenkins.
• Conducted performance testing on new and existing features to ensure optimal performance and identify bugs.

Full Stack Developer Freelance

Enotar.io

Sep 2023 - Oct 2023 | Costa Rica

• Created and developed blog section, user dashboard and payment form.
• Implemented user authentication on the front end and back end.
• Created the modeling of the database.
• Implemented user-friendly UI based on Material Design and custom metadata objects to make the site search results better in the Google search engine.
• Deployed the Django app on AWS EC2 using Nginx and Gunicorn on Ubuntu platform.