Jeffrin James — Founder of SignupDoggy

Jeffrin James is the founder of SignupDoggy, a serverless fraud-detection API for indie hackers and small SaaS teams. Six years building fraud-detection systems, one-person operation, Mumbai India.

Jeffrin James — Founder of SignupDoggy

Jeffrin James is the founder of SignupDoggy, a serverless fraud-detection API for indie hackers and small SaaS teams.

BACKGROUND

Jeffrin is a software engineer based in Mumbai, India. He built SignupDoggy after spending six months and $2,400 on enterprise fraud-detection vendors that didn't fit his use case. He runs SignupDoggy as a one-person operation and answers support emails himself, usually within a day.

EXPERTISE

- Fraud detection: signup-quality scoring, account-takeover, payment fraud
- Disposable email detection and blocklist maintenance
- VPN, Tor, and residential-proxy detection
- SaaS signup-flow design and conversion optimization
- Cloudflare Workers, KV, and edge computing
- Indie SaaS, pay-per-call pricing models

CREDENTIALS

- 6+ years building fraud-detection systems
- Maintains SignupDoggy's 200,000+ domain disposable-email blocklist (synced daily from 5 public GitHub repos, 1 bulk API, 175 per-provider crawls)
- Maintains 70,000+ Tor exit node list, 24,000+ VPN/hosting ASN list
- Open-source contributor to disposable-email-domains

POSTS BY JEFFRIN

All posts on the SignupDoggy blog are written by Jeffrin. See /blog for the full list.

CONTACT

- Email: jeffrinjames99@gmail.com
- Alt: jeff9james@protonmail.com
- Site: signupdoggy.pages.dev