# Engine
#### Overview
Engine is an open-source, backend server that reads, writes, and deploys contracts at production scale.
#### Why use Engine?
Engine enables your app to:
* Send multiple blockchain transactions at once.
* Resubmit stuck transactions, handling nonce values, gas settings, and RPC errors.
* Avoid duplicate transactions.
* Manage multiple backend wallets and their funds.
* Control access from your backends and team members.
* Sponsor user gas fees.
* Deploy and interact with smart accounts.
* Subscribe to contract events and transactions.
