# Advancement and roles

Code4rena audits let people of a wide range of skill levels get rewarded while showcasing their talent in order to make the DeFi ecosystem more secure.

## Signal metrics

[The `signal` metric ](https://docs.code4rena.com/roles/signal)is Code4rena's accuracy metric for wardens and teams: a means of identifying wardens and teams who have consistently submitted valid findings. `signal` is a factor (along with [certification](https://docs.code4rena.com/roles/certification-id-verification)) in determining submission limits and commenting privileges during Post-Judging QA (PJQA).

## Wardens

Wardens protect the DeFi ecosystem from threats by auditing code.

Anyone can register to participate in an audit. Learn more about registering as a warden and joining an audit [here](https://docs.code4rena.com/getting-started).

## SR Wardens and certified contributors

Wardens who meet certain performance criteria within C4 earn the Certified Security Researcher (SR) role, which provides access to:

* Unrestricted number of comments during Post-judging QA
* Unrestricted number of submissions per audit

[More details here](https://docs.code4rena.com/roles/sr-wardens).

## Judges and Scouts

These prestigious roles are assigned to the most skilled and fair-minded members of Code4rena's community:

* [Judges](https://docs.code4rena.com/roles/judges)
* [Scouts](https://docs.code4rena.com/roles/scouts)