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$
USD
I will build crypto exchange API wallet system and payment backend with fastapi
Flutter Developer, iOS and Android Apps with AI Features
Flutter developer, 7+ years, building production iOS and Android apps plus the Python/Node backends behind them. 5.0 from 9 orders, zero cancellations, one client who came back five times. I build Flu...
About this Gig
Need a crypto exchange integration or wallet backend that handles real money safely?
I'm a senior backend developer with 10+ years of experience, and I've built production crypto infrastructure for live client platforms: exchange API integrations, wallet creation and balance tracking, and secure deposit/withdrawal processing all with Python/FastAPI and PostgreSQL.
WHAT YOU GET:
- Exchange API integration (Binance, Bybit and others) balances, orders, market data
- Wallet system: address generation, balance tracking, transaction ledger
- Secure deposit & withdrawal processing with webhook handling
- Clean FastAPI codebase with Swagger/OpenAPI documentation
- PostgreSQL + Redis architecture built for scale
- Full source code ownership
WHY ME:
- Real production experience this is what I do for clients, not a tutorial skill
- Security-first: key management, transaction integrity, audit trails
- Swagger documentation with every delivery
- 5.0 rating, repeat clients
IMPORTANT: Message me before ordering. Crypto projects vary widely in scope a 10-minute chat protects your budget and my delivery time.
I reply within an hour.
Wallet Type:
Paper wallet
Operating system:
iOS
•
Android
•
Windows
Programming Language:
Python
FAQ
Can you integrate Binance, Bybit or other exchange APIs?
Yes — exchange integration is core to what I do: account balances, order placement, market data streams and webhook handling, built into a clean FastAPI backend.
Do you build custodial wallet systems with deposits and withdrawals?
Yes. I build wallet backends with address generation, balance tracking and secure deposit/withdrawal flows — the same architecture I've delivered for production client platforms.
How do you handle security and private keys?
Security-first design: proper key management practices, transaction integrity checks, audit logging and least-privilege API design. I'm happy to walk through the architecture before you order.
Can you show previous work?
Yes — I can share Swagger/OpenAPI documentation and architecture diagrams from real projects (client-identifying details redacted under NDA). Message me and I'll walk you through it.
Do you work with testnet first?
Yes, and I recommend it — I typically build and verify on testnet (e.g. Sepolia) before mainnet deployment, so you never risk real funds during development.
