Common Issues
auth
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.
Victor Denisov
Developer
hanson1014
Full-stack developer experienced in fixing and deploying AI-generated apps from Lovable, Bolt.new, Cursor, and Replit. I specialize in debugging Supabase integration issues (auth flows, RLS policies, database connections), fixing broken deployments, resolving routing/blank screen problems, and cleaning up messy React/Vite codebases. I also build production apps with the Claude API and have shipped a Mac desktop dev tool (Nexterm from scratch. Based in Hong Kong, fast turnaround.
Kingsley Omage
Fullstack software engineer passionate about AI Agents, blockchain, LLMs.
Basel Issmail
’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems.
My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale.
In addition to development, I often collaborate closely with product managers, business analysts, designers, and QA teams to ensure that solutions align with both technical and business goals.
I enjoy working with startups and product teams where I can contribute both as a hands-on engineer and as a technical partner in designing and delivering impactful software.
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.
Caio Rodrigues
I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures.
I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations.
Beyond coding, I care about **software quality and architecture**, following best practices for componentization, code organization, and performance optimization.
I'm also comfortable working across the stack when needed, integrating APIs, handling business logic, and helping transform prototypes into production-ready systems.
My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.**
PawelPloszaj
I'm fronted developer with 10+ years of experience with big projects. I have small backend background too
Bastien Labelle
Full stack dev w/ 20+ years of experience
BurnHavoc
Been around fixing other peoples code for 20 years.
Taufan
I’m a product-focused engineer and tech leader who builds scalable systems and turns ideas into production-ready platforms.
Over the past years, I’ve worked across startups and fast-moving teams, leading backend architecture, improving system reliability, and shipping products used by thousands of users. My strength is not just writing code — but connecting product vision, technical execution, and business impact.
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.