A very significant event occurred during 1927. His grandfather who was getting very old wanted him to be initiated in the Srivaishnavite tradition called as Samashrayanam by his Guru Narayanacharya of the Munitraya tradition. However the Guru on seeing the young man said that he already has the marks on his shoulders and he has God's Blessings and did not agree to initiate him saying that it would be Bhagavadapachaara. This made many persons in the family wonder. However, his interest in the philosophy of Sri Ramanuja flared up and he wrote his first book 'Metaphysics of Ramanuja's Sri Bhashya' and got it published in 1928. It was later observed by Sriman D.T.Tatacharya, an acknowledged authority in the tradition of Visistadvaita, that without the grace of Udayavar(Sri Ramanuja), it is impossible to unravel the intricacies of his philosophy as was done in the book.
Sri V.K.Narasimhan who later joined the National Daily "The Hindu" was instrumental in giving him the opportunity to review books on Philosophy, Psychology and Religion that continued for over 3 decades. His reviews appeared almost on all the Sunday editions of The Hindu, the prestigious newspaper, and got him enormous reputation as a philosopher.
He was a Research Scholar of the Madras University from 1926 to 1929. In 1929 he joined as a Research Fellow of the Andhra University, then located at Guntur. He then developed the close contact with the Theosophical Society, Adyar and was influenced by the writings of Madam Blavatsky and Ms. Anne Besant. During these days he lectured in the Theosophical lodges at Chittoor and Madanapalle. He was greatly influenced by the writings of Ouspensky and other researchers in the field of Spirituality. During this period he also had a brief contact with Sri. Jiddu Krishnamurthy, who did not however impress him and he was more attracted to the philosophy of Sri Aurobindo.
During this period he developed very close friendship with Sri S. Vedantam and Sri S. Rajam of the Murray and Co. that lasted his entire life period. It is stated that the scholar used to visit the auctions of the Murray and Co. and purchased books acquired and maintained as personal Libraries by many, presumably Englishmen who were leaving the Country after assignment in service or otherwise. The interesting and regular customer attracted the attention of the brothers and finding their interests had a common base, they became bosom friends. The affection and love that developed between them is a story by itself. He was influenced by them in his understanding of the Tamil literature particularly relating to the Alwars of Sri Vaishnavaism and he also shared his philosophy and spirituality with them. The admiration of the friends and the philosopher was mutual and their intimacy of friendship worth emulation. He got both of them later in touch with the Great Master and did yeomen service to them.
He joined the Christian College as a Lecturer in Philosophy in 1930. In 1931 a great scholar Sri P. Nagaraja Rao who specialized in Dvaita Philosophy obtained his Ph.D., in Philosophy from Madras University and is believed to have boasted that the University honored itself by granting him the doctorate. Prof. P.N.Srinivasacharya, a great exponent of the Visistadvaita Philosophy, called Sri. Varadachari and asked him whether he could not attempt research for a Doctorate in Visistadvaita. This resulted in his thesis "Theory of Knowledge of Sri Ramanuja's Sri Bhashya' in a record time of 9 months and he submitted his thesis to University in 1931. The script was typed by him. The Madras University awarded him Ph.D in 1932 and he became the first person to get a Doctorate in Visistadvaita from that University. This being a rare accomplishment Dr.Varadachari was later called only Doctor by all near and dear.
After being a lecturer in the Union Christian College till 1932, he worked for a brief period as Lecturer in the College at Alwaye till 1933. His first child, Rohini was born on 12th Dec.1932. In 1932 he gave a series of lectures at Bellary where his father was working on Vedanta called "Living Teachings of Vedanta". These lectures got developed as the basic tenets of his personal philosophy that was integral and organismic idealism. The idea that God is the Soul of all that is in existence and all conscious beings are to live in cohesion and cooperation with a sense of service to each other was the theme that he propagated and practiced ever since. Unfortunately his daughter died of small pox on 12th Dec.1934 giving him and his young wife happiness only for 2 years. Later from 1936 he worked at Lingaraj College, Belgaum. His first son Aravinda Rajagopal was born in July 1935 and his second son Srivatsan in June 1937. His third son Narayana was born in June 1939. His father retired from Govt.Service in 1939 and settled at Tirupati.
Dr. Varadachari's interest in Aurobindonian philosophy matured and he found close links between the Integral Philosophy of Aurobindo and the Visistadvaita and expressed them in his writings. He was one of the acknowledged authorities in this philosophy and Sri Aurobindo himself has endorsed his writings as authentic in many letters to his admirers. A very strange event occurred again in his spiritual life. He met Sri Aurobindo and sought initiation in 1937. When he sat with his chest bare before the Advent, he was informed that another person will initiate him later and Sri Aurobindo himself is not the one to lead him in the path. The sincere seeker in the philosopher was totally confused and decided to seek help from Divine at his own place, Tirupati. Never did he seek the help from others in the path by going to them, but waited patiently for the Master to arrive at his doorstep.
At the same time Sri Venkateswara Oriental Institute was started by the T.T.D. The most revered Vedantacharya of the day, Sriman Mahamahopadhyaya Chetlur Narsimhachariar Swamin was the first professor of the Chair of Visistadvaita and Bhagavadvishaya in the Sri Venkateswara Oriental Institute. He invited Dr.K.C.Varadachari to join the Institute as Professor of Comparative Religion and Philosophy and thus he moved into his native place where he was to work till his retirement in the S.V.University in 1962.
During his tenure at the Oriental Institute and later he developed close association with Sriram D.T.Tatachariar Swami along with whom he has written many commentaries on the Upanishads notably Isa, Kena, Katha and Prasna. While working for S.V.O.I he organized the All India Oriental Conference in March 1940 and got National recognition for his scholarship in Vednata, Nyaya and Western Philosophy. The conference itself was to be under the Chairmanship of the famous Pundit Madan Mohan Malavya. Because of his participation in the Freedom movement at the last moment he could not come, the organizers of the A.I.O.C. however decided to take a procession of the Photograph of Pundit Malavya in the streets of Tirupati and this attracted the attention of the people towards the Institute as also to the National Freedom movement. This has resulted in the local scholars developing a peculiar sort of envy and they were led to the feeling that they cannot get recognition so far as he stays at Tirupati. Doctor, was invited to the Institute was considered as a 'white elephant' by the Devastanams and his salary reduced by 50%. This they thought would make him leave the place for good. But then the Professor made a surrender to the Lord Venkateswara and said he came to serve the cause of Visistadvaita and Srivaishnavism and would not leave come what may. He had to put up with many situations of insult and disgrace in the hands of management and his fortitude was sufficiently built up by such incidents and became stronger spiritually by the day. In May 1941, his wife delivered the first female child Padmini, after three boys.