Astina maintains a broad civil practice, particularly in commercial and company matters, and has also handled cases relating to securities law, land, probate, trust, professional liability and defamation. She has appeared as a sole advocate before the Court of Appeal, Court of First Instance, District Court, Lands Tribunal; and has ample experience handling trials on her own. Her practice extends to local and cross-border arbitrations.

Astina received her BBA(Law) and LL.B. from the University of Hong Kong and her LL.M. from Harvard Law School.