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Ethereum Smart Contracts

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Smart contracts are programs that run on the Ethereum blockchain, automating transactions and enforcing agreements without intermediaries. Developers writing secure, audited contracts earn $200k-500k+ annually. DeFi (decentralized finance) has $100B+ TVL; security vulnerabilities cost protocols millions. Time to competency: 8-12 weeks for Solidity developers. Senior practitioners earn 40-60% premium because they prevent catastrophic bugs (reentrancy, integer overflow, logic errors) and architect protocols that move billions.

Vad är Ethereum Smart Contracts

Smart contracts are programs running on the Ethereum blockchain that automate agreements and transactions without intermediaries. They're written in Solidity, compiled to bytecode, deployed to the blockchain, and execute deterministically (same input = same output, always). A simple example: a token transfer contract. User sends ETH, contract verifies payment, transfers tokens, updates balances. All immutable, transparent, and trustless (no intermediary needed).

🔧 VERKTYG & EKOSYSTEM
Solidity programming languageHardhat development frameworkTruffle suiteEtherscan block explorerMetaMask walletOpenZeppelin contractsSlither static analyzerEchidna fuzzerForge testing frameworkWeb3.js/Ethers.js libraries

💰 Lön per region

OmrådeNybörjareMidErfaren
USA$120k$200k$350k
UK£75k£125k£210k
EU€85k€145k€245k
CANADAC$125kC$210kC$370k

❓ Vanliga frågor

What's the difference between Solidity and other smart contract languages?
Solidity is the dominant Ethereum language (90%+ of contracts). Vyper = Python-like (less used). Rust = used on other chains (Solana, Polkadot). Solidity is the safe bet: most tooling, libraries, auditors, jobs.
What are the most common smart contract vulnerabilities?
Reentrancy (recursive calls draining funds), integer overflow (arithmetic wraps around), logic errors (incorrect state transitions), access control (unauthorized functions), and front-running (miners/bots exploiting transaction order). Exploits have cost protocols $billions. Security is critical.
How do you test smart contracts?
Unit tests (Hardhat, Truffle), integration tests (full workflows), fuzz testing (Echidna finds edge cases), formal verification (mathematical proof of correctness). Professional contracts require all four + manual audit.
What's the gas cost of smart contracts and why does it matter?
Gas = computational cost on Ethereum (measured in wei). Complex operations = high gas = expensive for users. Optimizing gas saves users money and makes contracts competitive. Example: sorting 100 items on-chain = very expensive; keep computation off-chain, only store results.
How do you deploy a smart contract?
Write Solidity code, compile (solc), test (Hardhat), deploy to testnet (Goerli, Sepolia) for testing, then mainnet. Deployment is a transaction; costs gas. Immutable once deployed (can't change code), so testing is critical.

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