t
tim_c_leon

Tim Leonsteyn

@tim_c_leon

Rescue and launch audits for apps built with AI

Germany
German, English
About me
Your app is 80% built with Lovable, Bolt, Replit or Cursor, and the last 20% keeps breaking: logins, Stripe payments, the database, deployment. I audit and fix exactly that. Former Head of Tech (single sign-on, device management, security standards) turned consultant. Today I build and run production software with AI: an iOS app on the App Store and several web apps on Next.js, Supabase, Postgres and Stripe. Audit first, then a fixed-price fix with clear acceptance criteria. Your code, your accounts, documented handover.... Read more

Skills

t
tim_c_leon
Tim Leonsteyn
Offline • 

See my services

Troubleshooting & Improvements
I will audit your vibe coded app for security and payment bugs before launch
From$145 / projectMore details
Troubleshooting & Improvements
I will fix login, payment and database bugs in your vibe coded app
From$290 / projectMore details

Portfolio

Work experience

Panthera_Metamorphic Advisory

Founder and Independent Consultant

Panthera Metamorphic Advisory • Self-employed

Sep 2024 - Present • 2 yrs 2 mos

I build and run production software with AI (mainly Claude Code) and help companies do the same. - Built and run an iOS app live on the App Store (Capacitor) and several web apps on Next.js, React, TypeScript, Supabase, Postgres and Stripe, deployed on Vercel. - Built an invoicing automation that has run in production at a psychotherapy practice since June 2026. - Run automated marketing and reporting pipelines (Google Ads, analytics, daily briefings). - Interim lead of a business unit at a deep-tech water filtration company (12/2024 to 09/2025): team, hiring, processes, budget, reporting. - Founder's Associate at a deep-tech startup (06 to 11/2024): value proposition, funding applications that won, recruiting.