This 2025 guide reveals how a solo founder grew a $17K MRR SaaS business using only Reddit — with zero audience and zero ad spend. The video features Diego, the creator of App Alchemi, who explains how he built and validated his AI-powered design tool in just two weeks, reached over 1 million impressions, and attracted 1,000+ paying customers through strategic Reddit marketing. You’ll learn the full Reddit Marketing Playbook: how to choose profitable subreddits, write viral posts that convert, build trust organically, and avoid spam bans. This tutorial also covers tech stack setup (Next.js, Firebase, AI APIs), startup scaling lessons, and actionable advice for solo founders aiming to launch or validate MVPs fast in 2025. Perfect for SaaS founders, indie hackers, and digital entrepreneurs seeking high-ROI marketing strategies without ads.