The president of CSC Europe Guy Hains has expressed his full confidence in Lorenzo, a delayed e-records system which is due to be installed in dozens of major hospitals in England.
He told a conference in Westminster on the future of the NHS's £12.7bn National Programme for IT (NPfIT) that clinicians love Lorenzo.
Some 35 of them have recently spent three weeks away from their usual work in Chennai, India, working with software developers on Lorenzo, he said.
Speaking at the Conservative Technology Forum, Hains said that the visits were a huge success and would lead to better systems being installed.
He said: "Hands up, yes it [Lorenzo] is two years late on the plus side it is a fantastic system. Clinicians love it."
Lorenzo is the "SAP of healthcare" and comprises ten million lines of code which will rise to 15 million lines when competed.
Hains conceded that upgrading hospital systems has proved to be more work than CSC had originally thought. Getting the timing and sequencing of implementations in hospitals has also proved more complicated than expected.
To a question about the failure of some implementations of NPfIT systems he said one answer was for the supplier to keep large numbers of its people in the trust during the post-live acclimatisation process.
This is necessary extra support given that trusts have two shifts of NHS staff, a high turnover of people and doctors moving between hospital sites.