For hire as a remote senior mobile and AI engineer in the European Union, United Kingdom, United States, and Canada. Ali Wajdan is a senior Flutter, SwiftUI, and Node.js engineer based in Lahore, Pakistan, with five years of experience building production mobile apps and the AI and backend services behind them. Experience with Anthropic Claude and OpenAI integrations, RevenueCat subscriptions, Firebase backends, FastAPI services, and Stripe payments. Open to remote full-time employment or long-term contract work. Five hours of overlap with European working hours, three hours with US East Coast. Available to hire as a Flutter engineer, iOS engineer, AI mobile app developer, full-stack mobile app developer, or senior mobile engineer, full-time or on a fixed-scope project.

Monetiza.

A personal-finance app that had to feel as trustworthy as the bank apps it sits next to on the home screen. I picked the architecture, shipped both stores, ran the subscription stack end to end. Solo, in eleven months.

Monetiza personal-finance app home screen showing accounts list, subscription gating, and AI-categorised transactions.
Role
Lead engineer
Stack
Flutter · RevenueCat · Firebase
Timeline
Mar 2023 to Feb 2025
Reach
120K+ users · iOS + Android

/ 01 / ProblemA trustworthy mobile bank-adjacent app, shipped solo.

Monetiza came to me with a half-built React Native prototype, two designers, and a runway problem. They wanted a real iOS and Android release in a quarter, a subscription stack that wouldn't leak revenue, and a backend they could actually scale on after I left. The founder's brief was the kind I like: “Don't tell us what you can't do. Tell us what you'd build.”

/ 02 / DecisionFlutter, RevenueCat, Firebase. No clever choices.

I rewrote the app in Flutter in six weeks. “We already have RN, just finish it” is the most expensive trap I've watched founders walk into. A week into the rewrite, the team stopped asking. Subscriptions went through RevenueCat with server-side receipt validation (never client-only). Firebase Auth, Firestore, and Functions covered auth, storage, and the lightweight server logic without a second engineer.

/ 03 / BuildEleven months, three releases that mattered.

  • v1: ship the core flows. Onboarding, accounts list, transaction tagging, manual entries.
  • v1.4: subscription gating and paywall. The single biggest revenue moment in the app's life.
  • v2: AI-powered transaction categorisation. Server-side, prompts versioned in the repo, fallbacks for cold-start users.
  • 120K+
    Active users across iOS and Android
  • 4.8★
    App Store rating, 8K+ reviews
  • 11×
    Subscription revenue growth in year 1

/ 04 / ArchitectureWhat's running today.

App
Flutter 3.x
State
Riverpod 2
Auth
Firebase Auth
Data
Firestore + Functions
Subs
RevenueCat (server validation)
Payments
Stripe (web)
AI
Claude · transaction categorisation
Analytics
Mixpanel + custom funnel

/ 05 / What I'd tell a founderThe honest version.

If you're building a mobile-first product with subscription revenue and an AI feature on the roadmap, you don't need three engineers to hit PMF. You need one who's fluent in mobile, server, and the AI layer, and who will write the README. That's the work I want.

Ali shipped what would have taken our team a quarter in three weeks. He owns the whole stack, mobile, API, infra, without us having to chase him.

Founder, Monetiza · series-seed fintech
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