Company File / Cybersecurity
Doppel
The world's first platform built for one job: defending you against the fake version of you.
The world's first platform built for one job: defending you against the fake version of you.
It is a fraudulent login page wearing your logo. A counterfeit executive on LinkedIn. A cloned support account replying to your angriest customer at 2 a.m. The internet has always had impersonators. What changed is the cost of making them - generative AI dropped it to nearly zero, and the fakes multiplied.
Doppel is the company that decided to scale the defense at the same speed. It is an AI-native platform for what the industry now calls Social Engineering Defense: spotting impersonation across social media, domains, app stores, and the dark web, then dismantling the infrastructure behind it. Less whack-a-mole, more taking the mallet to the mole's entire operation.
For years, security budgets poured into firewalls, endpoints, and the network perimeter - the machine attack surface. Meanwhile the cheapest way in stayed the same: trick a human. Phishing, fraud, and impersonation quietly became the front door for the majority of incidents, and the tooling to fight them stayed scattered across a dozen dashboards nobody had time to read.
The wrinkle, of course, is that the attackers got the AI upgrade first. A convincing fake site or cloned profile used to take effort. Now it takes a prompt. Defenders found themselves bringing a manual takedown form to an automated knife fight.
Kevin Tian and Rahul Madduluri crossed paths at Uber in 2016. In 2022 they co-founded Doppel - Tian as CEO, Madduluri as CTO - originally to help crypto companies fight the impersonation scams swarming that world. Crypto was a brutal proving ground: high-value targets, fast-moving fakes, and almost no margin for a slow response.
Their bet was that the same engine could defend anyone. If you could correlate scattered attack signals into a single map and let AI act on it, brand protection stopped being a help-desk chore and became a real-time system. The name says the quiet part out loud: Doppel, as in doppelganger - the fake version of you it exists to find.
Kevin Tian and Rahul Madduluri meet as engineers. The company comes later; the partnership starts here.
The pair launch Doppel to fight impersonation aimed at crypto companies, backed early by South Park Commons.
The platform expands beyond crypto into the broader enterprise, with backing from a16z and Bessemer.
Led by Bessemer at a $600M+ valuation, just six months after the B. Total raised passes $124M.
Named to Fortune's Cyber 60 and announces a brand partnership with the New York Knicks.
The technical heart is the Threat Graph: an AI system that pulls signals from across channels and connects them into a single picture. A fake domain, a cloned social account, and a fraudulent ad aren't three separate tickets - they're one operation, and Doppel maps the links. Then it automates takedowns across platforms instead of filing forms one at a time.
Around that core sit three jobs most companies used to juggle separately:
Brand and executive protection that finds and removes impersonation, fake accounts, lookalike domains, and malicious content across social, web, and marketplaces.
Multi-channel phishing simulations and security awareness training, so the humans being targeted get harder to fool.
Advanced email security and phishing triage that catches inbound social engineering before it reaches the click.
The connective tissue: agentic AI that correlates a billion-plus daily signals and acts on the ones that matter.
Speed is the whole game in social engineering, so Doppel reports its work in time and volume. The platform analyzes more than a billion indicators a day, and its median takedown clocks in under 10 hours - the window where most of the damage gets done.
The customer list reads like a who's-who of companies that can't afford a convincing fake - and the investor list reads like a group that noticed.
Doppel's stated mission is plain: protect the world from the rising flood of AI-powered social engineering. The company also made a smaller, telling choice - it gave a cybersecurity brand a bright, loud color palette, on purpose, to break from an industry that usually dresses in black. Confidence, it turns out, is also a security posture.
Underneath the palette is a serious claim. If impersonation is now cheap and instant, then defense can't be a quarterly report or a manual form. It has to be a system that watches everything, connects the dots, and acts before the fake does its damage.
Go back to that fraudulent login page wearing your logo, the counterfeit executive, the cloned support account working the night shift. None of that has stopped. AI made impersonation a volume business, and volume businesses don't quit.
What's different is the other side of the staring contest. Where a fake site once lived for days, it now has hours. Where a takedown meant a queue and a prayer, it means a Threat Graph and an automated strike. Doppel didn't make the doppelgangers disappear - it made them a much worse investment. In a fight defined by the clock, that is the whole point.