Freelancer profile translated to English.
Back to original languageAbout David
I fix and harden applications that AI leaves unfinished.
Lovable or Bolt-like generators produce apps that work in the demo but fail in production: open RLS exposing user data, duplicate Stripe webhooks, secrets in client code, fragile authentication. My job is to bring those apps to real production.
How I work:
- Fixed scope and price before starting. No surprises.
- Short turnarounds (24-72h for fixes, 48h for audits).
- Each delivery includes a video proof of before/after and a report detailing what was changed and why.
- Proprietary tool: LaunchFix, a scanner that audits Supabase + Stripe + deployment (RLS, secrets, CORS, webhooks) and generates a prioritized report with evidence.
Stack: React, TypeScript, Python, Flutter, Supabase, Stripe, Cloudflare/Vercel.
If something is outside my scope, I'll tell you before charging, not after.
Spanish
Native or bilingual
English
Conversational
Remote only
Primarily works remotely
Experience
- LaunchFix (producto propio)Creator and Developer — Supabase + Stripe Launch ScannerJuly 2026 - Today (1 month)Design and development of LaunchFix, a scanner that audits Supabase + Stripe applications before launching to production: RLS policies, secrets exposed in the client, Stripe webhooks (signature, raw body, idempotency), CORS, and deployment configuration. Generates a prioritized HTML report with redacted evidence and correction steps. Includes a test suite and a vulnerable demo app to showcase findings. Public demo: bolonyokte.github.io/launchfix
- Freelance (proyectos propios y clientes directos)Independent Full-Stack DeveloperSOFTWARE PUBLISHINGJuly 2026 - Today (1 month)Development and auditing of web and mobile applications. Creator of LaunchFix (security and configuration scanner for Supabase/Stripe apps: RLS, secrets, webhooks, CORS, with prioritized HTML report and test suite). Automations and bots (Python/Node: API integration, Telegram, algorithmic trading systems). Mobile apps in Flutter with full deployment.
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