Services
I help businesses and individuals with mobile apps, AI visibility, and web security.
Flutter App Development
Cross-platform mobile apps with offline-first architecture, PDF invoicing, and QR payments.
AI Visibility Audit (GEO)
Audit your visibility in AI search. Find out how ChatGPT and other AI see your website.
Web Firewall Scanning
Detection of manipulative patterns, prompt injection, and dark patterns on websites.
Selected Work
Projects I'm currently working on or that represent my work.
FACHA
Offline invoice and job tracking app for tradespeople and freelancers. Generates PDF invoices with QR payments, works without internet.
AI-ready Web & E-shop Audit Tool
Tool that audits how websites/e-shops appear in AI answers (Chat/GEO). Flags visibility risks and outputs recommendations + CSV/PDF/XML.
Web Firewall
Scanner that detects risky patterns and attempts to force AI/scripts to store or exfiltrate data; highlights manipulative elements.
Skills
Technologies and approaches I use.
Flutter (Android/iOS)
Native performance, single codebase.
Offline-first (SQLite/Drift)
Apps work without internet.
PDF generation, QR payments
Invoices, documents, payment QR codes.
API integrations (ARES, etc.)
Connection to external services and registries.
Rapid prototyping
From idea to working MVP in days.
Speed-focused UX
Simple interface, minimal clicks.
About
I'm a solo developer focused on practical tools. I enjoy solving real problems and iterating with users. I believe the best software comes from listening to the people who use it. I build things that work offline, are fast, and stay out of the way.
Contact
Have an idea or question? Get in touch.
Or email directly at
hello@ondys.devSupport
If my projects help you, consider supporting me. It helps with development and running costs.
Support