His core expertise is in investment banking, project finance, corporate restructuring and capital market.

Rajan has visited Singapore, London, Tokyo, Hong Kong, New York & Dubai on business engagements.

During his leadership, Indian Bank received Golden peacock National Training Award for the year 2009 presented at a special awards function on 9 October 2009 at London during the 10th International conference on Corporate Governance.It was during his tenure that Indian Bank appeared first in featured in the list of Forbes 2000–2009 (1659th position).

Rajan built his career in Union Bank of India where he started off as a probationary officer and rose to the rank of general manager.

He was a member of the Faculty of Union Bank Staff Training establishment at Bangalore for nearly seven years after exposure at field level from 1972 to 1981.

Union Bank's Zonal Office was going through a challenging phase being amongst the pioneers to introduce credit cards in India.

Union Bank's Top Management were working on a proposal to create a branch which could exclusively cater to the industry's needs.

He was a nominee of Union Bank of India on the Board of Dewan Housing Finance Corporation Ltd for nearly two years.

Rajan was also a Director in United India Insurance Company Ltd and actively contributed in the board deliberations.

Rajan is a self-avowed "Task and People Oriented Leadership", referring to the philosophy developed by management Gurus Robert R. Blake and Jane Mouton.

His interest towards academia in India has seen him being the visiting faculty for many events including Liba [3]& MOP Viashnav During his tenure at Indian Bank, Rajan played a pivotal role in assisting the bank to enter the stock market (Bombay Stock Exchange BSE) and filed its draft in the red herring prospectus (DRHP) with the Securities and Exchange Board of India (SEBI) on 1 December 2006 with a proposal to enter the capital market with its initial public offering of equity shares.

[4] Lakhs of migrants who run thousands of tiny businesses there send Rs 3,000–40 billion every year to hometowns in Tamil Nadu and other parts of India.

Rajan and his family were featured on Indian National Television, Doordarshan under a show called "Vetrikku Pennal".