This is the 17868th most frequent Russian word.
успешном
"Успешном" means "successful" in English.
The word 'успешном' describes the successful nature of the project's completion, used as an adjective modifying 'завершении' (completion).
Мы говорили об успешном завершении проекта.
We talked about the successful completion of the project.
Here, 'успешном' is used to emphasize the success attributed to the company's launch, serving as an adjective for 'старте' (launch).
Он принял участие в успешном старте компании.
He participated in the successful launch of the company.
In this sentence, 'успешном' characterizes the experience she shared, functioning as an adjective modifying 'опыте' (experience).