Full Stack AI Development: Build & Launch Production Apps

The market is screaming. Are you building for it?

AI is eating every industry. Products built by developers who understand both systems and AI are commanding premium prices. The opportunity window is now.

Not tutorials. Products you can charge for.

Every project in CodeBitByBit is designed to be a real, deployable, monetizable product. Your GitHub won't look like a graveyard — it'll look like a portfolio that converts.

5 phases. One complete builder.

Every module is outcome-first. You don't study a concept — you ship a feature. By the end, you've built the full stack, not just learned about it.

Production tech, no toy stacks.

Everything you learn is what's actually running in real startups and tech companies right now. Not dated. Not simplified.

AI isn't a module. It's the foundation.

Most courses bolt on one AI chapter at the end. In CodeBitByBit, AI integration starts at week 5 and deepens every week after that.

This is what production looks like.

No "console.log your way to success". You write code that handles auth, queues, real-time events, AI streaming, and payments from day one of each project.

// rag-pipeline.ts — Production RAG with streaming
import { OpenAI } from "openai";
import { PineconeClient } from "@pinecone-database/pinecone";
import { checkTokenBudget, deductTokens } from "@/lib/billing";
export async function queryRAG(
  userId: string,
  query: string,
  namespace: string
): Promise<ReadableStream> {
  // 1. Check billing budget before processing
  const budget = await checkTokenBudget(userId);
  if (!budget.sufficient) throw new Error("Token budget exceeded");
  // 2. Embed query + semantic search
  const embedding = await openai.embeddings.create({
    model: "text-embedding-3-large",
    input: query
  });
  const results = await index.query({
    vector: embedding.data[0].embedding,
    topK: 6, includeMetadata: true, namespace
  });
  // 3. Build context + stream response
  const context = results.matches
    .map(m => m.metadata?.text).join("
");
  const stream = await openai.chat.completions.create({
    model: "gpt-4o", stream: true,
    messages: [
      { role: "system", content: `Answer using: ${context}` },
      { role: "user", content: query }
    ]
  });
  // 4. Track usage for billing
  await deductTokens(userId, stream.usage?.total_tokens ?? 0);
  return OpenAIStream(stream);
}

// billing/webhook.ts — Payment Gateway + usage-based billing
import PaymentGateway from "payment-gateway-sdk";
import { db } from "@/lib/db";
export async function handleSubscriptionEvent(
  event: PaymentGateway.Event
) {
  switch (event.type) {
    case "customer.subscription.created": {
      const sub = event.data.object as PaymentGateway.Subscription;
      await db.user.update({
        where: { paymentCustomerId: sub.customer as string },
        data: {
          plan: getPlanFromPriceId(sub.items.data[0].price.id),
          subscriptionId: sub.id,
          currentPeriodEnd: new Date(sub.current_period_end * 1000),
          tokenBudget: getTokenBudgetForPlan(sub)
        }
      });
      break;
    }
    case "invoice.payment_succeeded": {
      // Reset monthly token budget on renewal
      await resetTokenBudget(event.data.object);
      break;
    }
    case "customer.subscription.deleted": {
      await downgradeToFree(event.data.object);
      break;
    }
  }
}