Building CollabKar: An AI-Powered Influencer Marketing Platform with Gemini

CollabKar, an AI-powered influencer marketing platform built for the All Things Agentic Hackathon by Google Cloud & Gemini, aims to help Indian MSMEs and D2C founders vet creators and price campaigns. The platform uses Gemini 3.5 Flash for natural-language matching and pricing suggestions, and includes fraud detection to distinguish genuine follower growth from fake spikes.

This post was created for the purposes of entering the All Things Agentic Hackathon Google Cloud & Gemini . Influencer marketing in India is booming, but for MSMEs and D2C founders it's still a black box. How do you know if a creator's followers are real? What's a fair rate for a campaign? And once you pay, is your money actually safe? That's the gap CollabKar sets out to close. CollabKar is an AI-powered influencer marketplace that connects brands with vetted creators — no spreadsheets, no cold DMs, no guesswork. A brand can describe their campaign in plain English and get matched with relevant creators instantly. Three things make this possible: gemini-3.5-flash , so brands don't need to know the right search filters, they just describe what they want gemini-3.5-flash for natural-language matching and pricing suggestionsGetting the AI matching to feel conversational — "just describe your campaign" — while still surfacing enough concrete data rates, engagement, niche fit for a brand to actually trust the recommendation took real iteration. Fraud detection was its own challenge too: a sudden spike in a creator's followers isn't always fake, sometimes it's just a creator having a great week, and the system has to tell the difference. Built for the All Things Agentic Hackathon by Google Cloud & Gemini.