Uiharu is one of the most skilled hackers in Academy City, which is considered to be 20 or 30 years ahead the rest of the world in all technology, including computers and cyber security; to the point a student like Mikoto compared her surprise at seeing the level of security of the American Liberal Arts City to "seeing a car running on coal". Broke through an encryption that Mikoto Misaka, a Level 5 electromaster quite versed in breaking through Academy City security, thought would take some time in 7 seconds. Her Judgement office is rumored to be one of the top 10 strongest security systems in Academy City, and she has caught several prominent hackers that have tried to breach it. Identified and caught an experienced Academy City hacker using a handheld gaming device. Casually hacks Academy City satellites, smartphones and cameras. Hacked and took over the security system of the new juvenile hall that had been put together by Academy City's best engineers and AI during a jailbreak trial on the spot without making preparations or research prior to the trial. On that occasion she demonstrated the ability to identify the habits and preferences of the engineers and to use that knowledge to her advantage. Created a secure server to communicate without being tracked by
Anti-Skill and made a social media app just for fun with a voice recognition program that writes the message for you, automatically adding punctuation and even emoji and emoticons where appropriate.