Alex U.

Full Stack AI Engineer

Fitwell

May 2022 - Present • 4 yrs 2 mos

I work as a Fractional CTO and AI Full Stack Engineer for a subscription-based AI fitness SaaS platform that reached 140k+ users. I help manage and improve the full product ecosystem across the mobile app, web app, backend, payments, subscriptions, tracking, AI recommendation engine, support workflows, and developer coordination. Key work includes: • Managing Flutter mobile app development for iOS and Android • Working on web app and funnels built with Next.js • Handling backend/API systems using Express.js and MongoDB • Supporting the AI workout recommendation engine using Python and FastAPI • Setting up Stripe payment flows, subscriptions, webhooks, and access logic • Working with RevenueCat and Superwall for mobile subscriptions and paywalls • Connecting Meta SDK, Meta Pixel, CAPI, GA4, GTM, Firebase, and Microsoft Clarity • Reviewing developer work, testing features, fixing bugs, and launching production updates • Helping with customer support, subscription access issues, payment issues, and app operations This role gives me real hands-on experience across SaaS, AI, mobile apps, payments, analytics, tracking, app monetization, and production systems.