As a payments company, security is core to everything Stripe does. I've worked with Sakurity both through their responsible disclosures as well as a contracted penetration test of Stripe. Sakurity has always been professional and responsible in their work, and Stripe today is more secure due to their efforts.
We’ve been working closely with Sakurity to identify key weaknesses within our app. Sakurity is industry leader in identifying oauth weaknesses. They've helped us to identify and resolve potential security holes such as xss, account hijacking, and access token leaking.
As a service that provides authentication, authorization and single sign-on infrastructure, security for Auth0 is a top priority. Sakurity has consistently demonstrated deep expertise in evaluatiing identity protocols, and security in general. The Sakurity team helped us with a full audit of our platform and we consider the company part of our extended team.
Payment Gateways and their providers, online banking and wallets as well as critical APIs.
Cutting edge application stacks, such as Ruby on Rails, Node.js, Scala etc.
Identity providers, OAuth/OpenID and Single sign-on security.
All things related to crypto-currencies. Hey, we accept Bitcoins too!