What a strong Web3 specialist actually knows
A Web3 product is mostly ordinary software wrapped around hard edges: wallets, signatures, gas, finality and chain reorganisations. A good developer hides those edges. They design wallet connection and transaction flows that explain what is happening, handle rejected and pending states and never leave users guessing.
On the back end they index events with The Graph or custom listeners, cache chain reads sensibly, protect RPC keys and plan for provider outages. They treat the chain as one source of truth among several.