System and Software Architecture review. Focus on protection of user data, including personal and financial data. Threat analysis and mitigation techniques tailored by application and industry. Using a combination of in person review and code spelunking I can tell you where your systems are most vulnerable and what solutions best fit your company's needs.
Accurate timekeeping has become increasingly important in many industries, including finance, manufacturing and telecommunications. As the leader of the Precision Time Protocol project I have a wealth of experience in designing and deploying systems to keep massive numbers of hosts well synchronized.
The Design and Implementation of the FreeBSD Operating System, 2nd Ed. is the definitive work on one of the most popular, open source, kernels. You can also see my Amazon Author Page.