"brilliant development" is correct and usable in written English.
You can use it to describe something that has been developed in an impressive or innovative way. For example: "The new app has been a brilliant development in the world of online communication."
This is not a brilliant development.
Says Katherine: "Brewing is one of those fantastic sectors where you are looking at a brilliant development route.
On the contrary, it has always been home to some of the world's most brilliant development thinkers.
James Joyce's subtle yet frank portrayal of human nature, coupled with his mastery of language and brilliant development of new literary forms, made him one of the most commanding influences on novelists of the 20th century.
Even with respect to the phenomena of light, the corpuscular and hence atomic theory of Newton, which held that light is made of tiny particles, was adopted almost universally, in spite of Huygens's brilliant development of the wave hypothesis.
Bavarian Baroque art in the hands of the brothers Egid Quirin Asam and Cosmas Damian Asam was almost entirely confined to churches, and their brilliant development of the theatrical illusionism of Bernini is achieved in the high altar of the monastery church at Rohr, in Germany (1718 25), and in St. John Nepomuk in Munich (begun 1733).
Given that all the initial and brilliant developments took place in Daresbury, this was a strange and unfair decision, the reasons for which have never been fully disclosed.
Nations have dominated, when they have, not because tennis is the rage among their youth or because their national tennis federations have honed brilliant new development programs.
The brilliant artistic development of Vladimir-Suzdal was brought to a sudden end by the mid-13th-century invasions of the Mongols, who conquered all but northwestern Russia and destroyed countless treasures.
Half way through this brilliant personal development bible, Personal Development for Smart People, all I could think was that those running for office ought to read and heed its message.
Brilliant achievements, social development and, that ubiquitous word, harmony featured large in their presentations.
