# 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 ](/roles/signal.md)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](/roles/certification-id-verification.md)) 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](/getting-started.md).

## 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](/roles/sr-wardens.md).

## Judges and Scouts

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

* [Judges](/roles/judges.md)
* [Scouts](/roles/scouts.md)


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