Some tips for Debian developers and prospective developers.
The best way to get up to speed on what every Debian developer should know is to install the debian-policy and developers-reference packages, and read both documents. The Developer's corner on www.debian.org links to these and additional official project documents such as the New Maintainer's Guide.
The pages below offer supplemental documentation and tips.
WhyDebianForDevelopers - Is Debian Project a home for your programming skills?
RepositoryLocal - Using a local repository
DebianMachines - Using Developer Machines to fix architecture-specific packaging problems
DeveloperConfiguration - How to configure a system for package development