Software Crypto/Web3 Engineering

Quick Reference

Task	Default	Use When
EVM contracts	Foundry first, Hardhat when plugin-heavy TS workflows matter	Solidity, DeFi, token standards, upgradeable systems
Solana programs	Anchor + current Solana SDK guidance	Rust programs, SPL assets, high-throughput apps
Cosmos contracts	CosmWasm	IBC-native or Cosmos appchain ecosystems
TON contracts	Tolk for new contracts; verify supported toolkit in TON docs	Telegram distribution, TON-native wallets and assets
Bitcoin/Lightning	Bitcoin Core + BDK/LND patterns	Wallets, PSBT, settlement, payment rails
Account abstraction	ERC-7702 for EOAs (delegation persists; guard callers), ERC-4337 for smart accounts	Batched txs, gas sponsorship, session keys, social recovery
Security review	Slither, Echidna, Medusa, Halmos, Certora; audit guide	Audits, pre-deploy review, invariant enforcement
Cross-chain	Chainlink CCIP, LayerZero, Wormhole, IBC	Token bridges, cross-chain messaging, interoperability
Backend integration	Queue-backed RPC clients + idempotent handlers	Custody, deposits, withdrawals, webhook/event ingestion
Research	Official docs/specs first, then ecosystem analytics	Chain selection, framework choice, current best practice