Skill Profile

Solidity

Solidity: data types, storage/memory, modifiers, patterns, gas optimization

Blockchain & Web3 Smart Contracts

Roles

where this skill appears

Levels

structured growth path

Mandatory requirements

the other 4 optional

Blockchain & Web3

Smart Contracts

3/17/2026

Choose your current level and compare expectations. The items below show what to cover to advance to the next level.

What is Expected at Each Level

The table shows how skill depth grows from Junior to Principal. Click a row to see details.

Role	Required	Description
Blockchain Developer		Writes basic Solidity smart contracts: ERC-20 tokens, simple storage, and access control patterns. Understands data types, visibility modifiers, and gas costs. Tests contracts with Hardhat and deploys to testnets.
Smart Contract Developer		Understands Solidity fundamentals: contract structure, inheritance, events, and error handling. Implements basic smart contracts following OpenZeppelin patterns. Writes unit tests with Foundry/Hardhat and uses Remix for rapid prototyping.

Role	Required	Description
Blockchain Developer		Independently develops with Solidity in Hardhat/Foundry. Conducts basic audits. Optimizes gas.
Smart Contract Developer		Independently develops with Solidity in Hardhat/Foundry/OpenZeppelin. Conducts basic audits. Optimizes gas.

Role	Required	Description
Blockchain Developer	Required	Designs complex Solidity architectures: proxy patterns (UUPS, Transparent), diamond standard, and gas-optimized data structures. Conducts security audits and writes comprehensive test suites with fuzzing. Optimizes contract bytecode size and execution costs. Mentors team on advanced Solidity patterns.
Smart Contract Developer	Required	Designs production-grade Solidity contracts for DeFi protocols: AMMs, lending, and yield strategies. Masters assembly-level optimizations (Yul), storage layout packing, and EVM opcode costs. Implements formal verification with Certora. Mentors developers on gas-efficient and secure Solidity.

Role	Required	Description
Blockchain Developer	Required	Defines Solidity development standards and coding guidelines for blockchain products. Establishes contract architecture patterns, upgrade strategies, and deployment workflows. Conducts code reviews focused on security, gas efficiency, and maintainability.
Smart Contract Developer	Required	Defines Solidity best practices and smart contract architecture standards for the team. Establishes testing frameworks (unit, integration, invariant tests), CI/CD pipelines for on-chain deployments, and upgrade governance procedures. Reviews all production contract code.

Role	Required	Description
Blockchain Developer	Required	Defines organizational Solidity development strategy across multiple EVM-compatible chains. Designs cross-chain contract architectures and interoperability standards. Drives adoption of new Solidity features and EVM improvements. Contributes to EIP proposals and community tooling.
Smart Contract Developer	Required	Defines enterprise Solidity strategy spanning DeFi, NFT, and governance protocols. Designs reusable contract libraries and cross-protocol composability patterns. Establishes formal verification and audit methodologies as organizational standards. Influences Solidity language evolution through EIP contributions.

Junior 2 requirements

Blockchain Developer

Writes basic Solidity smart contracts: ERC-20 tokens, simple storage, and access control patterns. Understands data types, visibility modifiers, and gas costs. Tests contracts with Hardhat and deploys to testnets.
Smart Contract Developer

Understands Solidity fundamentals: contract structure, inheritance, events, and error handling. Implements basic smart contracts following OpenZeppelin patterns. Writes unit tests with Foundry/Hardhat and uses Remix for rapid prototyping.

Middle 2 requirements

Blockchain Developer

Independently develops with Solidity in Hardhat/Foundry. Conducts basic audits. Optimizes gas.
Smart Contract Developer

Independently develops with Solidity in Hardhat/Foundry/OpenZeppelin. Conducts basic audits. Optimizes gas.

Senior 2 requirements

Blockchain Developer
Required

Designs complex Solidity architectures: proxy patterns (UUPS, Transparent), diamond standard, and gas-optimized data structures. Conducts security audits and writes comprehensive test suites with fuzzing. Optimizes contract bytecode size and execution costs. Mentors team on advanced Solidity patterns.
Smart Contract Developer
Required

Designs production-grade Solidity contracts for DeFi protocols: AMMs, lending, and yield strategies. Masters assembly-level optimizations (Yul), storage layout packing, and EVM opcode costs. Implements formal verification with Certora. Mentors developers on gas-efficient and secure Solidity.

Lead / Staff 2 requirements

Blockchain Developer
Required

Defines Solidity development standards and coding guidelines for blockchain products. Establishes contract architecture patterns, upgrade strategies, and deployment workflows. Conducts code reviews focused on security, gas efficiency, and maintainability.
Smart Contract Developer
Required

Defines Solidity best practices and smart contract architecture standards for the team. Establishes testing frameworks (unit, integration, invariant tests), CI/CD pipelines for on-chain deployments, and upgrade governance procedures. Reviews all production contract code.

Principal 2 requirements

Blockchain Developer
Required

Defines organizational Solidity development strategy across multiple EVM-compatible chains. Designs cross-chain contract architectures and interoperability standards. Drives adoption of new Solidity features and EVM improvements. Contributes to EIP proposals and community tooling.
Smart Contract Developer
Required

Defines enterprise Solidity strategy spanning DeFi, NFT, and governance protocols. Designs reusable contract libraries and cross-protocol composability patterns. Establishes formal verification and audit methodologies as organizational standards. Influences Solidity language evolution through EIP contributions.

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