Common Issues
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Users Can See Each Other's Private Data
Users in your app can see data that belongs to other users — viewing other people's orders, messages, personal information, or account details. This is a serious privacy and security issue that needs to be fixed immediately.
Common Causes
- No Row Level Security (RLS) — database queries return all data, not just the current user's
- API endpoints don't filter data by the authenticated user's ID
- User ID taken from the request body instead of the authenticated session
- Shared cache serving one user's data to another
- Query fetches all records and filters on the frontend only
How to Fix It
- This is urgent — fix it before anything else. Consider taking the affected features offline temporarily.
- Check every API endpoint that returns user data — make sure it filters by the authenticated user's ID
- If using Supabase, implement RLS policies on all tables containing user data
- Never trust user ID from the request body — always get it from the server-side session
- Test by logging in as different users and verifying each only sees their own data
Real developers can help you.
Anthony Akpan
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Matthew Jordan
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Milan Surelia
Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems.
Expertise:
💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web.
🖋️ Sharing insights through technical writing, blogging, and open-source contributions.
🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences.
Notable Achievements:
🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX.
🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development.
🌟 Open source contributions on Github & StackOverflow for Flutter & Dart
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Milan is always happy to connect, work on new ideas, and explore the latest in technology.
Alvin Voo
I’ve watched the tech landscape evolve over the last decade—from the structured days of Java Server Pages to the current "wild west" of Agentic-driven development. While AI can "vibe" a frontend into existence, I specialize in the architecture that keeps it from collapsing.
My expertise lies in the critical backend infrastructure: the parts that must be fast, secure, and scalable. I thrive on high-pressure environments, such as when I had only three weeks to architect and launch an Ethereum redemption system with minimal prior crypto knowledge, turning it into a major revenue stream.
What I bring to your project:
Forensic Debugging: I don't just "patch" bugs; I use tools like Datadog and Explain Analyzers to map out bottlenecks and resolve root causes—like significantly reducing memory usage by optimizing complex DB joins.
Full-Stack Context: Deep experience in Node.js and React, ensuring backends play perfectly with mobile and web teams.
Sanity in the Age of AI: I bridge the gap between "best practices" and modern speed, ensuring your project isn't just built fast, but built to last.
Describe what's wrong in plain English. No technical knowledge needed.
Get HelpFrequently Asked Questions
How serious is this?
Very serious. This is a data privacy violation that could have legal consequences (GDPR, etc.). Fix it immediately and consider notifying affected users if sensitive data was exposed.
Can this be fixed without rebuilding the app?
Yes. Adding proper RLS policies (for Supabase) or API-level authorization checks can fix this without a rebuild. A developer can usually fix it within a day.