Hi everyone! 👋 My name is Harun. I am 12 years old. I don't own a laptop or a PC. My entire development environment is a POCO C55 Android phone and a free code editor called Acode . Today, on my school holiday, I decided to stop watching tutorials and actually ship something. I built KODA , a full-stack AI coding mentor. 🛠️ The Stack (100% Free Tier) Frontend: Vanilla HTML, CSS, and JavaScript (Hand-coded on a 6.7" screen). Backend & Auth: Supabase (PostgreSQL + Row Level Security). AI Brain: Groq (using the llama-3.1-70b-versatile model for speed). Hosting: Netlify (Drag-and-drop deploy). Mobile Wrapper: Median (to turn it into a native Android app with a splash screen). 🐛 The "Boss Fight" Bugs Building on mobile is hard. The screen is small, and debugging is painful. 1. The Mobile Viewport Trap: I used height: 100vh for my app container. On desktop, it's fine. On mobile Chrome, the address bar hides part of the screen, pushing my input box off the bottom! The Fix: I had to switch to height: 100% on the html, body and use env(safe-area-inset-bottom) to glue the input area above the navigation bar. 2. The Supabase RLS Silent Killer: My profiles table was updating, but my chats table was empty. No errors in the console. The Fix: I realized RLS (Row Level Security) was blocking inserts because I hadn't granted permissions to the authenticated role. I wrote a SQL script to GRANT ALL ON public.chats TO authenticated and suddenly, the data started flowing. 🏆 User #1 My older brother (an engineering student) was my first beta tester. He opened the app and typed: "Vanakam da mapila" (Hello friend/brother-in-law in Tamil). When I teased him for treating the AI like a person, he replied: "THAT'S MY FRIEND TEXTING YOU, IDIOT." 😂 That was the moment I knew the product felt "alive." 🚀 Try KODA I deployed it live on Netlify. It has multi-chat history, code syntax highlighting, and a "Panic" button that explains things "Like I'm 5." Live Link: koda-aicodementor.netlify.app 🙏 I Need Your Feedback Since I am learning solo, I would love for senior developers to roast my code or tell me what to build next. Should I add Streaming (typewriter effect)? Should I add a PWA manifest? Thanks for reading my story!