Skill Profile

Web3 Libraries

This skill defines expectations across roles and levels.

Blockchain & Web3 Web3 Development

Roles

where this skill appears

Levels

structured growth path

Mandatory requirements

the other 10 optional

Blockchain & Web3

Web3 Development

2/22/2026

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		Uses Web3 libraries for blockchain interaction: ethers.js, viem, web3.py. Connects to node via JSON-RPC. Reads contract data and sends transactions.
Smart Contract Developer		Uses ethers.js and viem for contract interaction: reading state, sending transactions, decoding events. Works with ABI encoding/decoding and contract factory patterns.

Role	Required	Description
Blockchain Developer		Develops SDK and library wrappers for blockchain infrastructure. Implements batched RPC calls, event subscription, retry logic. Supports multiple provider backends.
Smart Contract Developer		Develops TypeScript SDK for smart contract interaction: type-safe contract calls via viem/wagmi, multicall batching, event subscription. Generates types from ABI automatically.

Role	Required	Description
Blockchain Developer		Designs internal Web3 SDK for the organization: multi-chain support, provider failover, transaction management. Optimizes for high-throughput: connection pooling, request deduplication.
Smart Contract Developer		Designs contract interaction infrastructure: transaction management, gas estimation, nonce handling, retry logic. Optimizes for reliable execution and high-throughput batch operations.

Role	Required	Description
Blockchain Developer		Defines Web3 library strategy for the organization. Establishes shared SDK and migration plans between libraries (ethers→viem). Coordinates platform SDK development for external developers.
Smart Contract Developer		Defines Web3 library strategy for the organization. Establishes shared contract SDK and coordinates ethers→viem migration. Defines TypeScript contract interaction standards.

Role	Required	Description
Blockchain Developer		Defines enterprise Web3 library strategy. Contributes to open-source Web3 libraries. Shapes developer tooling vision and coordinates ecosystem partnerships.
Smart Contract Developer		Defines enterprise Web3 library strategy for smart contract platforms. Contributes to open-source Web3 libraries and shapes developer tooling for external contract developers.

Junior 2 requirements

Blockchain Developer

Uses Web3 libraries for blockchain interaction: ethers.js, viem, web3.py. Connects to node via JSON-RPC. Reads contract data and sends transactions.
Smart Contract Developer

Uses ethers.js and viem for contract interaction: reading state, sending transactions, decoding events. Works with ABI encoding/decoding and contract factory patterns.

Middle 2 requirements

Blockchain Developer

Develops SDK and library wrappers for blockchain infrastructure. Implements batched RPC calls, event subscription, retry logic. Supports multiple provider backends.
Smart Contract Developer

Develops TypeScript SDK for smart contract interaction: type-safe contract calls via viem/wagmi, multicall batching, event subscription. Generates types from ABI automatically.

Senior 2 requirements

Blockchain Developer

Designs internal Web3 SDK for the organization: multi-chain support, provider failover, transaction management. Optimizes for high-throughput: connection pooling, request deduplication.
Smart Contract Developer

Designs contract interaction infrastructure: transaction management, gas estimation, nonce handling, retry logic. Optimizes for reliable execution and high-throughput batch operations.

Lead / Staff 2 requirements

Blockchain Developer

Defines Web3 library strategy for the organization. Establishes shared SDK and migration plans between libraries (ethers→viem). Coordinates platform SDK development for external developers.
Smart Contract Developer

Defines Web3 library strategy for the organization. Establishes shared contract SDK and coordinates ethers→viem migration. Defines TypeScript contract interaction standards.

Principal 2 requirements

Blockchain Developer

Defines enterprise Web3 library strategy. Contributes to open-source Web3 libraries. Shapes developer tooling vision and coordinates ecosystem partnerships.
Smart Contract Developer

Defines enterprise Web3 library strategy for smart contract platforms. Contributes to open-source Web3 libraries and shapes developer tooling for external contract developers.

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