I'm 12. A senior dev broke my app. Then he became User #001

Announcing 🚨 :
First every code jam guys join on : https://dev.to/koda2026/announcing-the-first-ever-koda-code-jam-218n

Two days ago, my Dev.to post went viral. I gained 400 followers in a single night.

And then the worst thing a solo founder can experience happened:
My signup page threw a 500 error to every single person who tried to join.

I was at a family wedding. Eating biryani. Dancing. When I checked my phone, there was a notification from a senior developer named @nyaomaru:

"I tried your interesting app, but I couldn't make an account. POST https://... 500 Internal Server Error. Please check your netlify server log. 👍"

My heart stopped. 💔

The most humiliating thing for a 12-year-old solo dev? Having a senior engineer publicly point out that your production database is broken while hundreds of people are watching.

🕵️‍♂️ The 48 Hours That Changed Everything

Instead of laughing at me, the Dev.to community rallied.

@publiflow (a SaaS founder) was already deep in my comments debating visibilitychange state management and optimistic UI patterns. He treated me like an equal, not a kid.

@sanukhandev (a Tech Lead with 13 years of experience) wrote:

"Good Luck and keep building — Live Young Live FREE!! feel free to connect if you need any help fellow developer"

He called me "fellow developer." I almost cried. 🥹

So I opened Supabase on my POCO C55, in the middle of the wedding reception, and started debugging production SQL triggers between slices of cake.

The Bug That Almost Broke Me

Turns out I had THREE layers of bugs stacked on top of each other:

1. ❌ A missing is_champion column (I forgot to add it when I built the Code Jam feature).
2. ❌ A hidden leftover trigger on auth.users from an older build.
3. ❌ A type-mismatch bug in my referral trigger (text <> uuid — Postgres refused to compare them).

Senior engineers get paid serious money to find bugs like #3. I found it at 12 years old, on a 6.5-inch Android screen.

I ran the nuclear SQL fix to build an "un-killable" trigger:

create or replace function public.handle_new_user()
returns trigger
language plpgsql
security definer
as $$
begin
  insert into public.profiles (id, username, referral_count, is_ambassador, is_champion)
  values (new.id, coalesce(new.raw_user_meta_data->>'username', split_part(new.email, '@', 1)), 0, false, false)
  on conflict (id) do nothing;
  return new;
exception when others then
  raise warning 'PROFILE CREATION FAILED: %', sqlerrm;
  return new;
end;
$$;

I deployed. I messaged nyaomaru: "Please try again!"

🎯 The Plot Twist

A few minutes later, nyaomaru replied:

"I checked that I can make account! Well done 👍 Happy coding! 😸"

Then I opened my Supabase profiles table and saw it:
username: nyaonyao0725

The senior dev who found my bug, tested my app in Incognito, and gave me UX advice became KODA User #001. 😭 He reacted to my post with 💖 and 🦄. That was the moment I realized: the Dev.to community isn't just an audience. It's a family.

👀 The "Guest Mode" Epiphany

While I was fixing that 500 error, I realized something even bigger was wrong with my app: The Login Wall.

Think about it from a stranger's perspective. You click a link, and a 12-year-old is asking for your email and password. Are you going to sign up? Probably not.

So, I built Guest Mode.

Now, anyone can click "👀 Try KODA as Guest" and immediately start chatting with the AI. No email. No password. Zero friction. They get to experience the magic instantly.

But here is the growth hack: After they send 3 messages, the AI gently nudges them:

"You are in Guest Mode! I don't save chats for guests. Create a FREE account to save your history, join the Code Jam, and unlock the full Dojo! 🏆"

I learned a massive SaaS lesson that day: Let them taste the magic before you ask for their email.

🏰 The Database Logs Told Me A Story

After the bug was dead, I checked my chats table to see what real humans were asking my AI mentor. What I saw broke me in the best way possible:

• 🇮 A Tamil-speaking user asked: "Vanakam da mapla" and "Tamil pesuvaya". My AI replied in flawless Tamil. I built a multilingual mentor just by adding one line to my system prompt: "ALWAYS reply in the SAME language the user writes in."
• 🎮 A user asked: "Me want to create a app" and "Which app to create a game". My AI acted like a Product Manager, giving them a decision matrix and a full 5-session game-dev lesson plan.
• 📚 Another user asked: "teach me git" then "Explain simply like I am 5". My AI gave them the "Magic Notebook" analogy.

9 strangers from around the world are actively learning to code inside an app I built on my Android phone. That is not a metric. That is a mission.

🎉 The 1,000 Follower Moment

This morning, while eating ice cream at the wedding reception, my follower count ticked from 999 to 1,006.

I didn't tell my parents. To them, I'm just their 12-year-old son at a wedding. They don't know what Supabase is. They don't know what a Dev.to algorithm is. And that's okay.

But 1,006 developers from Brazil, Dubai, Japan, and the US know. They clicked follow because they saw a kid with a POCO C55 and a dream, and they said: "I'm watching this one."

🏆 The Gift (Still Running!)

To celebrate, I launched the First-Ever KODA Code Jam. It's a 7-day global coding event:

• The Mission: Build a single-page website for a niche market.
• The Rule: At least 50% of your code must be co-written with KODA.
• The Prize: Champion Status forever + featured interview on Dev.to.
• Timeline: Aug 27 – Sept 2.

👉 Read the full announcement & join the Code Jam here

Every legendary founder has a "scar." Mark Zuckerberg's was the server crashing when Harvard flooded Facebook. My scar is the Supabase on_auth_user_created trigger.

It means I didn't just build a toy project. I built a real product, put it in front of real people, the real world broke it, and this community helped me fix it.

Thank you to @nyaomaru, @publiflow, @sanukhandev, and the 1,006 of you who believed in me.

Let's build. 🏗️

— Harun, solo dev, age 12