> For the complete documentation index, see [llms.txt](https://docs.superposition.so/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.superposition.so/superposition-mainnet/developers/build-on-superposition-using-thirdweb/engine.md).

# Engine

### 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.

{% embed url="<https://portal.thirdweb.com/engine>" %}