In this episode, I sit down with David Attias (@DavidAttiasG), a former quant trader turned app developer, who built Stoppr, an app designed to help users quit processed sugar and take back control of their health. David shares his story of leaving finance for tech, how he taught himself to build apps, and the full journey behind creating Stoppr, from the first prototype to real users and marketing success.

🚀 Join the waitlist for the Incubator: https://www.notjust.dev/incubator

Follow David's Journey: https://x.com/david_attisaas

What You’ll Learn in This Episode:
👉 How David transitioned from finance to app development
👉 The story behind David's app - Stoppr
👉 The tech stack, tools, and frameworks used to build Stoppr
👉 How to approach app design with simplicity and clarity
👉 The full Onboarding Flow that's getting him the most subscriptions
👉 Marketing strategies he used and how to implement them
👉 Balancing monetization with user value
👉 Lessons learned from launching and scaling Stoppr

💬 Join the notJust Development gang and let's build together:
Twitter: https://twitter.com/VadimNotJustDev
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LinkedIn: https://www.linkedin.com/in/vadimsavin
Discord: https://discord.gg/VpURUN2

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notJust.dev

David Atas, a former quant trader with a CS background, built Stopper — a sugar-quitting app — in two weeks using Flutter, Firebase, and AI-assisted vibe coding with Cursor. The app reached $14K MRR within five months. Key insights include: taking inspiration from an existing app in a different niche, building a psychologically optimized 40-screen onboarding flow, using influencer marketing on TikTok and Instagram to drive early downloads, and tracking every user action with Mixpanel and Firebase. David also discusses his tiered paywall strategy with A/B testing, re-engagement push notifications and emails for trial cancelers, and his new AI-generated content strategy using Sora to scale TikTok distribution.

How David Built a $14K/Month App Helping People Quit Sugar