About Reaction Information Security

Experts in penetration testing.


About Reaction Information Security

Reaction Information Security Ltd was founded in the summer of 2009 by Director Joseph Sheridan to provide a penetration testing capability to small infosec companies. Since that time our client base and testing team has expanded to accommodate demand from public and private sectors across the UK. ReactionIS was awarded membership of the CESG CHECK scheme in August 2011.

CHECK Green Light

We are a CESG CHECK 'green light' company and all our consultants are highly skilled security experts with decades of industry experience across government, financial and FTSE 100 sectors.

Our consultants hold many security clearances and are certified to the highest industry standards including CHECK Team Leader, CREST Infrastructure and CREST Web Application standards.

Security Research

ReactionIS are committed to security research to ensure that our clients and the wider public are aware of security issues which could pose a threat to their organisations and data. We regularly publish security advisories and have found vulnerabilities in common software products from GIMP (Graphical Image Manipulation Program), Realplayer, Oracle and Toshiba. Our research helps keep our testers on the cutting edge and allows us to find vulnerabilities often missed by our competition. Our security advisories can be found here.

Get a Quote Online

Submit your testing requirements online and one of the team will get right back to you.

Penetration Testing Services

Firewall reviews, database audits, code reviews, social engineering and more..