With rapidly changing business environment and technological advancements comes a need for development of new features, upgrade existing features and reduce prices. The challenge for any organization is to satisfy these requirements under stringent budgetary constraints. Our sustenance engineering services help our clients support their existing products and customers cost effectively, while concentrating their in-house expertise in building new products or versions. We help our customers in supporting previous versions of the product, allowing them to focus on the strategy and directions for future releases. With our understanding of the product architecture and development expertise, we are able to recreate user problems and fix the issues as part of the assignment. To make sure that the rest of the features still work as desired, appropriate regression tests are performed. In case of a security bug or vulnerability, a security test is also performed to check that the fix does not create a new vulnerability.