Platform engineering data management at SAP SuccessFactors.

Previously, SAP HANA Column Store lead and part of the core HANA Database storage engine. Worked on native disk extension to the in-memory engine for warm data, HANA availability with workload management. Designed, improved and maintained in-memory and on-disk data structures in the HANA Delta Store to improve the performance of transaction and analytic work loads.

Distributed Load (Product: SAP IQ; Architecture/Design/Prototype; C++)

Designed and implemented a prototype to synchronize the generation of tokenized column values in a parallel and distributed system.

Lockless hash table resize (Product: SAP IQ; Developer; C++)

Designed and developed a lock free resize of a closed hash table used in the parallel insert and load of tokenized column values. Also invented a method to optimally garbage collect unused hash tables.

Login Profiles (Product: SAP ASE; Team lead with one more developer; C, Yaac & SQL)

Defined containers called login profiles that are used to group and enforce security attributes and permissions for logins across databases with support for high availability.

Role based access control (Product: SAP IQ; Scrum master leading a team of 8; C++, C, SQL)

Breakdown privileged operations into fine grained sets to support separation of duties and principle of least privilege. Defined ANSI SQL role, created a role hierarchy of system and user defined roles, administrators for roles and defined system privileges. Also invented a method for the dual control of changing a database login password.

Securing logins, roles and password management extensions (Product: SAP ASE; Team lead with two more developers; C, SQL)

Encryption of role passwords using SHA-256, accounting of roles, customizing the frequency/time period of the generation of the in-memory RSA key pair used for network password encryption, auditing enhancements and support in a high availability cluster.