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Blockchain Developer skills: what to learn first, and what can wait

Tutorials teach you to deploy a token. Hiring teams want to see that you can keep one safe. Learn the language and the test tools first, then the attack patterns, and leave cross-chain design and governance for later.

5 open jobs

Step one

Gets you the interview

Solidity and how the EVM runs itMost openings sit on Ethereum-compatible chains. You need to be fluent in modifiers, events, custom errors, mappings and how storage, memory and calldata differ, or the code review round ends early.

Foundry or Hardhat testingA repo with real tests is what separates you from people who copied a tutorial. Foundry's forge test, fuzzing and cheatcodes are what a lot of teams use day to day.

A TypeScript client with viem or ethers.jsNearly every contract has a front end or script calling it. Being able to read contract state, send a transaction and handle a wallet connection makes you useful right away.

OpenZeppelin contracts and standard token interfacesTeams expect you to reuse audited building blocks instead of writing your own access control or token logic. Knowing Ownable, AccessControl and the standard fungible and non-fungible token contracts saves everyone time.

Step two

Gets you the offer

Common attack patternsReentrancy, oracle manipulation, signature replay, unchecked external calls and rounding errors all come up in the review round. Reading public audit reports is the fastest way to learn them.

Gas optimisation you can explainPacking storage, caching reads and choosing calldata over memory show you understand cost. Being able to say when a saving isn't worth the readability hit matters just as much.

Invariant and fork testingInvariant tests catch the bugs unit tests miss, and fork tests prove your contract works against real deployed protocols. Both signal you test like someone who's been burned before.

Static analysis with SlitherRunning Slither in CI and triaging its output is a small habit that tells a hiring manager you won't hand the auditors easy findings.

Step three

Gets you promoted

Upgrade and admin key designSenior developers decide how proxies, multisigs and timelocks fit together, and they own the storage layout rules that keep upgrades from corrupting data.

Protocol and economic designAt the lead level you're shaping incentives, fees and liquidation rules, not just code. You need to spot where a clever user or a flash loan breaks the model.

A second ecosystem, usually Rust on SolanaRust with the Anchor framework, or a rollup's own tooling, widens what you can lead and helps when a team expands to another chain.

Running audits and incident responseScoping an audit, working through findings with the firm, and leading the call when something goes wrong on mainnet are what staff-level developers get trusted with.

Put it on your resume like this

Weak

Experienced in Solidity, smart contracts and blockchain security.

Strong

Built a lending pool in Solidity with Foundry invariant tests and Slither in CI; the external audit returned 0 high findings, and a storage refactor cut borrow gas by 22%.

Questions people ask

Do I need to know cryptography in depth?

Not for most contract roles. You should understand hashing, public and private keys, and how signatures are checked on-chain. Deep cryptography matters for zero-knowledge proof work and core protocol teams, which are specialist jobs.

Is a blockchain certificate worth paying for?

Usually not. Hiring teams look at your GitHub, your tests and any audit contest findings. A certificate won't hurt, but it rarely gets you past a code review round on its own.

How do I prove security skills without a job in the field?

Enter public audit contests and capture-the-flag games built around vulnerable contracts. Write up your findings, even the ones that were rejected, and link them from your résumé.

Which chain should I specialise in?

Pick the chain your target teams build on and go deep there before branching out. For most people that's Ethereum and the rollups built on top of it, because the same Solidity code and tools carry across all of them. Solana is the usual second choice, and it pays off if you already enjoy Rust.

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