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Fernando Balsera Martinez

@fernandobalseramarti

AI Engineer at OnionSentry contributing to a cyber-intelligence platform; creator of SkyNote, an astrology and AI-guided journaling app.

Spain

Message

At OnionSentry, I contribute to a cyber-intelligence platform, developing React interfaces for investigation workflows and secure product features. I also use LLM-assisted planning, execution, and validation in development.

I created and published SkyNote, an Android app combining Vedic astrology, journaling, and AI-guided reflection. I developed its natal-chart and transit features and integrated LLM-powered interpretations with chart data and journal entries.

Experience

Work history, roles, and key accomplishments

Current

AI Engineer - Full-Stack Developer

Current

OnionSentry

Dec 2025 - Present (10 months)

Contributing to the development of a cyber-intelligence platform involving data-rich interfaces, investigation workflows, and secure product features. Building frontend systems using React, TypeScript, JavaScript, HTML, and CSS, with emphasis on usability, clarity, and scalable component architecture.

React TypeScript JavaScript HTML CSS LLM Assisted Planning Codex Style Agents Structured Prompting AI In The Loop Validation Iterative Review Cycles

Creator & Full-Stack Developer

SkyNote

Built and published an Android app combining Vedic astrology, personal journaling, and AI-guided reflection, with support for English, Spanish, and Hindi. Developed natal-chart and transit features using structured astrological calculations, including nakshatras, divisional charts, and planetary strength analysis.

React TypeScript NodeJS PostgreSQL Capacitor LLM Powered Interpretations Astrological Calculations