a
ahsanusman

Ahsan U.

@ahsanusman
5.0(3)

AI Full Stack Engineer, Web3, Payments, Tracking, APIs and 144K Users

Pakistan
English
About me
I’m an AI Full Stack SaaS engineer with 9+ years in tech and hands-on experience helping build and manage a subscription fitness app that reached 140k+ users. I help founders and startups with Stripe and PayPal payments, subscriptions, RevenueCat, Superwall, APIs, webhooks, SaaS fixes, AI workflows, tracking, Meta CAPI, GA4, GTM, Web3, and backend systems. I’m not just a coder. I understand product, payments, tracking, support flows, and revenue-critical systems. If your app, SaaS, payment flow, API, AI workflow, or tracking setup needs to be built, fixed, or cleaned up, I can help.... Read more

Skills

a
ahsanusman
Ahsan U.
Offline • 
Average response time: 2 hours

See my services

Decentralized Applications (dApps)
I will build web3 dapp, presale, staking, and dex for web3 projects on evm or solana
5.0(3)
From$10 / projectMore details
API & Integrations
I will integrate stripe paypal payment gateway on your website or app
From$20 / projectMore details

Portfolio

Work experience

Fitwell

Full Stack AI Engineer

Fitwell

May 2022 - Present • 4 yrs

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.

3 Reviews
5.0

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    5
  • Recommend to a friend
    5
  • Service as described
    5
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