Mohyuddin H.

I help SaaS, fintech, and marketplace founders ship complete mobile + web products — the Flutter app, the GraphQL backend, the admin dashboards, and the App Store launch — without stitching together three separate contractors. 🏆 𝐂𝐫𝐞𝐝𝐞𝐧𝐭𝐢𝐚𝐥𝐬 ✦ 100% Job Success Score on Upwork ✦ All 5-star reviews across completed contracts ✦ 15+ apps shipped to the Apple App Store + Google Play ✦ Production-grade work across SaaS, fintech, and marketplaces ✦ 4+ years shipping production mobile + web apps. ⚙️ 𝐖𝐡𝐚𝐭 𝐈 𝐁𝐮𝐢𝐥𝐝 ✦ 𝐅𝐮𝐥𝐥-𝐬𝐭𝐚𝐜𝐤 𝐒𝐚𝐚𝐒 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐬 — multi-tenant platforms with role hierarchies, Stripe-tied billing, admin panels, deployed end-to-end on GCP / Firebase ✦ 𝐅𝐢𝐧𝐭𝐞𝐜𝐡 & 𝐩𝐚𝐲𝐦𝐞𝐧𝐭𝐬 𝐚𝐩𝐩𝐬 — Plaid bank sync, Stripe + Apple IAP + Google Play Billing, KMS-encrypted sensitive data, GDPR-compliant flows ✦ 𝐌𝐚𝐫𝐤𝐞𝐭𝐩𝐥𝐚𝐜𝐞𝐬 — Stripe Connect with KYC + two-sided payouts, in-app booking and messaging, moderation tooling, audit trails 🚀 𝐑𝐞𝐜𝐞𝐧𝐭 𝐖𝐨𝐫𝐤 ✦ 𝐆𝐨𝐨𝐝𝐧𝐞𝐬𝐭𝐬 — Multi-tenant community SaaS. Flutter mobile + web, Node.js + Apollo GraphQL v5 backend with a custom WebSocket layer, two TypeScript admin panels (community admin + platform super-admin), Stripe billing tied to member counts, deployed on GCP with Docker + Nginx + GitHub Actions CI/CD. ✦ 𝐉𝐄𝐒𝐘 — Two-sided marketplace for the electronic music industry. Stripe Connect with KYC and payouts, 19-page admin console, real-time chat with in-chat booking offers, 9-language i18n including RTL Arabic, ffmpeg video pipeline. ✦ 𝐏𝐨𝐜𝐤𝐞𝐭 𝐂𝐅𝐎 — Fintech app for freelancers and small businesses. Plaid real-time bank sync, IRS Schedule C tax reports (server-side PDF generation), multi-rail billing (Apple IAP + Google Play + Stripe), Google Cloud KMS field-level encryption, GDPR data export and deletion. Live on iOS + Android. ✦ 𝐏𝐢𝐱𝐀𝐫𝐭 𝐀𝐈 — Consumer AI anime art generator on iOS. ✦ 8+ additional apps across productivity, photo editing, mapping, language, and utility categories on the App Store + Google Play. 💻 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 ✦ 𝐌𝐨𝐛𝐢𝐥𝐞: Flutter (iOS, Android, Web, macOS), Dart, BLoC, Provider, GetIt ✦ 𝐖𝐞𝐛: React, TypeScript, Tailwind, GraphQL clients ✦ 𝐁𝐚𝐜𝐤𝐞𝐧𝐝: Node.js, Express, Apollo GraphQL v5, REST APIs, WebSockets (graphql-ws) ✦ 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬: PostgreSQL, Firestore, Redis ✦ 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬: GCP, Firebase, Docker, Nginx, GitHub Actions CI/CD, Let's Encrypt ✦ 𝐏𝐚𝐲𝐦𝐞𝐧𝐭𝐬: Stripe (incl. Connect marketplace), Apple IAP, Google Play Billing, Plaid ✦ 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: Google Maps, FCM, OneSignal, Resend, Brevo, Sharp, ffmpeg ✦ 𝐀𝐈: OpenAI + Claude API integrations, AI-augmented development workflow (Claude Code, Cursor) ✦ 𝐂𝐨𝐦𝐩𝐥𝐢𝐚𝐧𝐜𝐞: Google Cloud KMS encryption, GDPR export/deletion, audit logging 🎯 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 SaaS · Fintech · Marketplaces · AI consumer apps · Health & wellness · Education · E-commerce · Productivity utilities 💯 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐒𝐭𝐚𝐲 ✦ One engineer for mobile + web + backend + admin panel — no juggling three contractors ✦ Production-grade defaults: auth, role hierarchy, encryption, audit logging, CI/CD on day one ✦ Real-time done right — custom GraphQL-WS subscriptions, presence, live feeds (not just basic listeners) ✦ Full App Store + Play Store experience: rejection remediation, IAP compliance, ATT consent ✦ Founder-friendly: peer-to-peer communication, push back on weak specs, simpler scope when it'll save time 📩 𝐍𝐞𝐱𝐭 𝐒𝐭𝐞𝐩 Hit 𝐈𝐧𝐯𝐢𝐭𝐞 and send the rough idea — a Notion doc or 2-paragraph brief is enough. I'll come back within 24 hours with what's realistic, where I'd push back, and a low-risk first step (60-min paid audit, fixed-price first deliverable, or a paid trial week). — 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬: Flutter developer, Flutter web developer, full-stack mobile developer, Node.js developer, GraphQL developer, Apollo server, multi-tenant SaaS, Stripe Connect, Plaid integration, Firebase developer, React TypeScript admin panel, real-time WebSocket, iOS App Store submission, Google Play submission, in-app purchase, mobile app MVP, fintech app developer, marketplace app developer, SaaS architect, AI app integration