Zensar Technologies Ltd http://drupal.org/node/1888096

Zensar Technologies is a technology partner of choice for global organizations looking to strategically transform, grow, and lead in today’s challenging business environment.
Zensar's Open source team (about 250 in number) endeavors to work with its business clients to leverage open source technology to bring cost-effective and scalable solutions.

Backed by a strong track-record of innovation, over 7000 associates and footprint in more than 20 global locations, Zensar’s comprehensive range of software services and solutions enable its 400+ forward-looking customers to cross new thresholds of business performance.

The Company, owing to its growth in recent times has moved up the NASSCOM listing of Software Service Companies in India by 6 places to # 13 this year. This is reiterated in the Porter’s Prize for Best Strategic Management in the Information, Media and Telecom Industries that has been bestowed upon the Company. A noted publication, Dataquest in its Top 200 listing has rated Zensar 20 notches higher this year, given its performance.

Zensar operates in the US, Europe, Africa, Middle East and Asia-Pacific regions and has delivery centers in India (Pune, Hyderabad and Bangalore), China, Japan, UK, Amsterdam and US (Westborough).

Zensar is the world's first enterprise-wide SEI CMM Level 5 Company.

The Company has a services portfolio that ranges from the traditional to the transformational - across service lines of Management Consulting, Business Application Services, Enterprise Solutions, Enterprise Collaboration Services, Testing and Assurance Services, BPO and Infrastructure Management Services. Zensar’s experience across industries of Retail, Manufacturing, Insurance, Banking, Healthcare and others translate into a differentiated value proposition and faster time-to-market for clients. Our capability in infrastructure-oriented services ranges from remote infrastructure management to end user computing to data centre services and security and compliance. Zensar is now leading the way in powering next-generation enterprises with its cloud, mobility and social media solutions.

The open-source team in Zensar Technologies Ltd is about 3 years old in which we have implemented Drupal for some of our clients. We have not consciously given back to the community but we hope to be more active in this respect.
We are in process of submitting few case studies which we will update here as soon as they are published on drupal site.