Blockchain Platforms

Ethereum

Binance Smart Chain (BSC)

Tron

Polygon

Solana

Avalanche

Bitcoin
Programming Languages

JavaScript / TypeScript

Python

Solidity

Kotlin / Swift (for mobile)

Rust (for Solana-based wallets)
Front-End Frameworks

React.js

Vue.js

Flutter (for cross-platform mobile apps)
Back-End Technologies

Node.js

Express.js

Django

Firebase

GraphQL / REST APIs
Wallet & Blockchain Libraries

Web3.js

Ethers.js

TronWeb

BitcoinJS

WalletConnect

MetaMask SDK

Hardhat / Truffle (for smart contract dev)
Databases

MongoDB

PostgreSQL

Redis

IPFS (for decentralized file storage)
Security Integrations

AES & SHA-256 Encryption

Multi-signature support

Hardware wallet compatibility

Biometric authentication

2FA / OTP services