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I will build full stack fintech bank nfc crpto wallet payment neo web app developer
Calli Benny
5.0
5.0
About this gig
Full Stack Fintech, Bank, NFC & Crypto Wallet App Developer
Need a payment app, wallet app, bank app, or NFC payment app built right? I'm a full stack developer specializing in fintech app development, from neobank apps to crypto wallet apps and mobile banking systems.
WHAT I BUILD:
- Fintech & bank app (KYC, loans, transfers)
- Crypto wallet app, Web3 & DeFi apps
- NFC payment app & digital card systems
- Payment app (Stripe, PayPal, Flutterwave)
- Web to app conversion (Android/iOS webview)
- MERN stack, React Native & Flutter apps
- SaaS app developer scalable & secure
- App prototype & MVP for startup founders
- Vibe coding fixes, Lovable, Replit, Bolt
TECH STACK:
React | Next.js | Node.js | Laravel | Flutter | Firebase | MongoDB | PostgreSQL | Supabase | TypeScript | Stripe API | Web3.js
WHY CHOOSE ME:
- Mobile banking app with full API integration
- Secure, scalable & production-ready code
- Full stack website + app delivered together
- Fast delivery with clean, documented code
All packages include: UI/UX design, database setup, deployment & post-delivery support.
Let's build your fintech app today!
Get to know Calli Benny
Calli Benny
Full Stack Dev, Fintech, Bank, NFC Crypto App Builder
- FromItaly
- Member sinceJan 2026
- Avg. response time1 hour
- Last delivery1 week
Languages
English, German
Full Stack Developer specializing in Fintech, Bank,
Wallet, NFC & Crypto App development.
I build payment apps, mobile banking systems, crypto
wallets, and NFC payment solutions that work, on time,
on budget, and production-ready.
From MERN Stack and React Native to Flutter, Laravel,
Node.js, and Web3, I turn your app idea into a scalable,
secure, market-ready product.
Need a SaaS app, neobank, p2p payment system, or
web-to-app conversion? I deliver clean code and results.
Startups trust me. Clients return. Let's build yours.
FAQ
Can you build a fintech app with bank transfers, KYC, and loan features?
Yes! I build fintech apps with KYC, money transfer, loan management & mobile banking. Built with React Native or Flutter, Node.js or Laravel backend. Stripe, Flutterwave & Paystack payment integration included.
Do you build crypto wallet apps and Web3 DeFi applications?
Yes! I develop crypto wallet apps, blockchain apps, Web3 DApps, DeFi platforms & crypto exchanges. I work with smart contracts, Web3.js & Ethers.js for Bitcoin, Ethereum & token development projects.
Can you build an NFC payment app or NFC digital business card app?
Yes! I build NFC payment apps, NFC business card apps (like Popl), NFC reader apps & digital wallets for Android & iOS. Integrates RFID, QR code, BLE & smart card with a full backend dashboard.
Do you offer web to app conversion, website to Android or iOS?
Yes! I convert any website to Android/iOS using WebView, PWA or native rebuild. Covers WordPress, SaaS & e-commerce sites. Delivered as APK or IPA with your branding, app icon & splash screen.
What tech stack do you use for full stack web app development?
I use React, Next.js, Node.js, Express, Laravel, TypeScript, Flutter & React Native. Databases: MongoDB, PostgreSQL, Firebase, Supabase & Airtable. Deployed on AWS, Vercel or DigitalOcean with full API integration.
Can you build a SaaS app or MVP for my startup idea?
Yes! I build full SaaS apps with multi-tenant architecture, Stripe billing, auth & admin dashboards. I also fix Lovable, Replit, Bolt & v0 vibe coding projects or convert your Figma prototype into a production-ready app.
Do you integrate Stripe, PayPal, or Flutterwave into payment apps?
Yes! I integrate Stripe, PayPal, Flutterwave, Razorpay & Stripe Connect for marketplaces. I build p2p payment apps, BNPL, e-wallet & remittance apps with secure transaction flows & webhook handling.
Will my app work on both Android and iOS after development?
Yes! I use React Native or Flutter for cross-platform Android & iOS apps from one codebase. Native Swift (iOS) or Kotlin (Android) available for performance-critical apps. All apps are tested & store-ready.
Do you provide UI/UX design and app prototype before development?
Yes! Every project includes Figma UI/UX design, wireframes, clickable prototypes & app mockups before coding starts. Have a Figma or Adobe XD file already? I convert it directly into a functional app.
What is included after delivery, do you offer post-launch support?
Yes! All packages include source code, database setup, deployment, documentation & 7–30 days bug fixing. I also offer ongoing maintenance, feature development & performance optimization as add-ons.
Reviews
1 reviews for this Gig
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
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Most relevant
A 
arloneville
United Kingdom
I came in with a rough idea and Calli turned it into a clean, professional fintech UI faster than I expected. Delivered before the deadline, communicated clearly throughout, and even added features I didn't ask for, the NFC screen and crypto portfolioo were a great surprise. The code is well-structured,...
Up to $50
Price
2 days
Duration
Helpful?
Reviews
1 reviews for this Gig
| (1) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
A arloneville
United Kingdom
I came in with a rough idea and Calli turned it into a clean, professional fintech UI faster than I expected. Delivered before the deadline, communicated clearly throughout, and even added features I didn't ask for, the NFC screen and crypto portfolioo were a great surprise. The code is well-structured,...
Up to $50
Price
2 days
Duration
Helpful?
