Francisco de Haro

Full-Stack Developer

Worked on Fantasktic, a production multi-tenant B2B SaaS platform.

• Core contributor with 307 of 1,033 commits in a 6-developer team.
• Designed and evolved the main PostgreSQL data model (~150 tables) with Drizzle ORM.
• Built HR, geolocation, cross-domain authentication, and AI automations for email and calendar routing.

Stack: TypeScript, Next.js 14, PostgreSQL, Drizzle ORM, Redis, Docker

Technical Auditor & Developer

Technical audit of a production clinical platform using Stripe Connect, PostgreSQL, and sensitive data.

• Cross-referenced database records, bank logs, and Stripe events to detect silent webhook and billing failures.
• Identified and fixed issues that recovered more than EUR 1,200 and documented the full problem traceability.
• Implemented safeguards to prevent duplicates and future errors in automated charge flows.
• Delivered corrections and technical documentation to stabilize production billing flows.

Hydra (@deharo/hydra) - infrastructure for secure access to AI tools

Published npm package to manage access to AI tools from CLI and server environments, with RBAC, AES-256-GCM encryption, and remote execution over WebSockets to avoid exposing team credentials.

Saena - clinical SaaS · saena.app

Built the full product, including Stripe Connect, bidirectional Google Calendar sync, and real-time video calls with LiveKit.

Repai Trainer - published iOS app

Designed, built, and launched a full-stack iOS app with OpenAI-powered workout generation and subscription management through RevenueCat.