Drop-in MERN code to build the AI feature interviewers ask about, with every line explained and the cross-questions answered. Read, understand, ship: Friday night to Sunday. Monday: a live demo link on Naukri.
Choose your kit3 kits from ₹349 · Backed by the Ship-It GuaranteeYou're a capable MERN developer with 1–4 years at a startup or service company. But when it comes to AI, here's where you're stuck:
You don't need another clone or a 40-hour course. You need one real AI feature, built into the app you already have, that you understand well enough to defend line by line. The Retrofit Method gets you there in five layers, on plain LLM APIs and the MongoDB you already run. There's no LangChain and no new database to learn.
Ground makes the assistant answer only from your app's own MongoDB data, using Atlas Vector Search. Stream sends replies token by token into your existing React UI. Guard blocks off-topic questions, prompt injection, and one user seeing another user's data. Cap sets per-user usage limits and a hard monthly cost cap in ₹.
Defend is the layer tutorials never give you: a line-by-line understanding of everything you built, the resume bullet, and model answers to the cross-questions interviewers actually ask.
By Monday, your MERN app has a live AI assistant that answers from your own data, streams its replies, blocks misuse and caps every user's spend. So the next time a JD says "LLM integration experience", you apply first, with a live demo link, not a bluff.
Already have a MERN project and just want the essentials? Start with Retrofit Core. Want everything you need to ship by Sunday, starter app and interview drill included? That's the Weekend Retrofit Kit, our most popular. Work in TypeScript or Next.js, or preparing for senior rounds? The Retrofit Pro Pack has it all.
Here's what's in the Weekend Retrofit Kit. No videos: you read, you understand, you ship, and every piece is built to save you time and remove guesswork.
Go from setup to a live AI feature in one weekend: Friday 45 minutes, Saturday about 3 hours, Sunday about 3 hours. There are 12 modules, each explained line by line, with "Interviewer will ask" and "If it breaks" in every one.
Drop-in AI modules (embed and sync script, SSE route, streaming hook, guardrails, per-user limiter and ₹ cost cap) that slot into your app with 3 small edits. It includes a finished reference app with 30 automated tests, so you can see what "done" looks like.
Walk into the interview with model answers to 25 real AI questions, each linked to the exact file and line it's about. You defend your code instead of bluffing.
Can't use your company's code? Start from this seeded MERN app, or retrofit your own project. Either way, you're building on a real app from minute one.
Start for ₹0 on free API tiers that need no card. When you need higher limits, it shows you how to pay for LLM APIs from India and what a weekend build really costs in ₹.
A pre-commit hook that blocks leaked API keys before they're committed, plus a spend-cap checklist, so a mistake never turns into a surprise bill.
One-time payment. Delivered right after checkout. Need TypeScript and Next.js, or just the core? Compare all 3 kits.
Every kit gets you a live AI feature by Sunday night, and every kit is backed by the Ship-It Guarantee.
For TypeScript and Next.js developers, and anyone preparing for senior rounds.
Everything you need to ship by Sunday, even if you can't use your company's code.
For developers who already have a MERN project to build on.
One-time payment · Delivered right after checkout · Ship-It Guarantee on every kit
Follow the playbook. If your AI feature isn't live by Sunday night, email [email protected] within 30 days for a full refund, and keep the kit. It applies to every tier. And there's no deadline once you've bought: client release ate your weekend? Start any weekend you want. It's yours forever.
Included free with the Weekend Retrofit Kit and the Retrofit Pro Pack, so the feature you built actually shows up where recruiters look.
10 honest resume bullets plus before/after Naukri and LinkedIn rewrites, so your profile shows the LLM integration experience you now really have.
5 LinkedIn and Instagram posts that announce what you built as a builder sharing a lesson, without broadcasting a job hunt.
With a live demo link, not a bluff. One weekend from now, your MERN app can have a real AI assistant that answers from your own data, streams its replies, blocks misuse and caps spend in ₹, and you'll be able to explain every line of it.
Pro Pack ₹1,499 · Weekend Retrofit Kit ₹599 (most popular) · Retrofit Core ₹349
Want TypeScript, Next.js and the Interview Day Pack? Get the Pro Pack — ₹1,499 · Just the essentials for your own project? Get Retrofit Core — ₹349